WO2010134310A1 - Centrifugal separation device - Google Patents
Centrifugal separation device Download PDFInfo
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- WO2010134310A1 WO2010134310A1 PCT/JP2010/003299 JP2010003299W WO2010134310A1 WO 2010134310 A1 WO2010134310 A1 WO 2010134310A1 JP 2010003299 W JP2010003299 W JP 2010003299W WO 2010134310 A1 WO2010134310 A1 WO 2010134310A1
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- WIPO (PCT)
- Prior art keywords
- sludge
- inorganic flocculant
- flocculant
- inorganic
- supply
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B11/00—Feeding, charging, or discharging bowls
- B04B11/02—Continuous feeding or discharging; Control arrangements therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
- B04B2001/2033—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl with feed accelerator inside the conveying screw
Definitions
- the present invention relates to a centrifuge for concentrating or dewatering sludge with a centrifuge.
- the flocculant used differs depending on the type of solid-liquid separator (centrifuge, belt press, screw press, etc.). Two liquids of ferric sulfate solution and (2) polymer flocculant solution are used as the agent. First, the inorganic flocculant solution (first liquid) is supplied to the sludge, and then the polymer flocculant solution ( 2nd liquid) is supplied.
- the “two-component method” reduces the moisture content of the dehydrated sludge and increases the clarification of the dehydrated separation solution, compared to the “one-component method” using, for example, only the polymer flocculant. (SS recovery rate improvement), phosphorus (eutrophication substance) can also be removed from the dehydrated separation liquid.
- the sludge is first fed with the polymer flocculant solution (first liquid) and then with the inorganic flocculant solution (second liquid). , Usage method, operation method, and flocculant are selected.
- a method of supplying the polymer flocculant solution to the sludge supply chamber provided in the inner cylinder screw of the centrifuge Intramolecular injection method ”.
- an inorganic flocculant is supplied to the sludge supply pipe as the first liquid and mixed with the sludge, and the sludge (aggregated sludge) generated by the flocs floc is supplied to the centrifuge and is put into the centrifuge.
- the polymer flocculant is supplied as the second liquid from the extending polymer flocculant supply pipe.
- JP 7-256300 A (paragraph [0005]) JP-A-8-71600 (paragraph [0021] and FIG. 1)
- the appropriate polymer flocculant and its supply amount also differ, and the work such as selection of the optimum polymer flocculant and determination of the supply amount becomes complicated.
- the amount of coagulant inorganic or polymer
- the water content of the separated material dehydrated sludge
- the volume of a separated substance will increase and will interfere with subsequent disposal.
- the inorganic flocculant solution tends to harden at joints with other pipes, curved (refractive) portions, injection port portions, etc., and when the solid grows, the inorganic flocculant solution is clogged and clogged.
- the supply of cereals was stopped and the concentration process and dehydration process were hindered.
- the inorganic flocculant solution is injected into the sludge, not only the flocculant sludge supply pipe (sludge supply pipe) but also the outlet of the sludge supply pipe that opens in the centrifuge and centrifugal separation are used. It also occurred at the sludge supply port provided in the sludge supply chamber in the machine, and there was a problem that it interfered with the concentration treatment and dehydration treatment.
- balance adjustment is very important for a centrifuge that rotates at high speed, but if the centrifuge is not cleaned properly, it may lose balance and cause a serious accident. There was a problem that had to be done.
- the inorganic flocculant is not supplied to the sludge in advance, or if the sludge and the inorganic flocculant component cannot react sufficiently, not only will the clarification (SS recovery rate) of the separated liquid deteriorate, but the sludge will contain a high concentration.
- the phosphorus concentration is increased without the phosphorus being removed and the concentration of phosphorus is increased, and the separation liquid having such deteriorated water quality is returned to the wastewater treatment facility to increase the pollution load.
- the present invention has been made in order to solve the above-described problems, and agglomeration in which solid-liquid separation has progressed during the transition to the separated discharge side of the pool formed between the outer trunk bowl and the inner trunk screw.
- the sludge (separated sludge) and the inorganic flocculant react efficiently and reliably to further separate the separated liquid from the separated sludge, and the water content of the separated product (dehydrated sludge) can be reliably reduced and inorganic agglomeration can be achieved.
- the agent can be directly injected into the separated sludge, it can be immediately injected without reducing the flocculation effect of the inorganic flocculant, and a centrifuge capable of stably maintaining the high solid-liquid separation performance of the centrifuge is provided. For the purpose.
- the centrifugal separator according to the present invention includes an inorganic flocculant discharge hole in a centrifugal separator that separates sludge into a separated product and a separated liquid by a centrifugal separator having an outer trunk bowl and an inner trunk screw, and the inner trunk.
- An inorganic flocculant injection pipe for injecting an inorganic flocculant into a sludge supply chamber disposed in the screw and a water supply pipe for supplying water connected to the inorganic flocculant injection pipe are provided.
- the sludge supply chamber of the centrifugal separator according to the present invention is provided with a sludge supply port, a partition plate, and a flocculant outlet.
- the centrifugal separator according to the present invention includes an inorganic flocculant supply pipe for supplying an inorganic flocculant to sludge.
- the centrifugal separator according to the present invention includes a phosphorus concentration measuring device for measuring the phosphorus concentration of the separation liquid.
- the centrifugal separator according to the present invention includes a separation liquid circulation pipe for supplying the separation liquid to the water supply pipe.
- the inorganic flocculant injection pipe for injecting the inorganic flocculant into the sludge supply chamber disposed in the inner cylinder screw of the centrifuge and the water supply pipe connected to the inorganic flocculant injection pipe are provided.
- the inorganic flocculant is injected directly into the sludge supply chamber using the inorganic flocculant injection pipe, and the pool separation formed between the outer shell bowl and the inner shell screw is discharged through the flocculant outlet.
- the inorganic flocculant can be quickly and reliably injected into the agglomerated sludge (separated sludge) that has undergone solid-liquid separation during the transition to the side.
- Agglomerated sludge (separated sludge) that has been efficiently separated into solid and liquid can be reacted with the inorganic flocculant, and the separated liquid can be further separated from the separated sludge. The water content of sludge can be reduced.
- the inorganic flocculant can be directly injected into the separated sludge, it can be injected immediately without reducing the flocculating effect of the inorganic flocculant, and the high solid-liquid separation performance of the centrifuge can be stably maintained.
- the inorganic flocculant is directly injected into the separated sludge, waste can be saved and the amount of the inorganic flocculant can be easily adjusted, so that the amount of inorganic flocculant used can be reduced. As a result, the operation cost can be reduced and complicated operation management can be avoided.
- the inorganic flocculant is appropriately injected into the separated sludge on the separated product discharge side of the pool, it is possible to prevent excessive pH drop of the coagulated sludge, suppress corrosion and deterioration of the centrifuge, etc. This eliminates the need to provide facilities, reduces operating costs, maintenance and repair costs, and the like.
- inorganic flocculant can be appropriately adjusted and injected into the generated flocculent sludge, so the pH and cation degree increase accompanying the injection of inorganic flocculant into sludge Regardless of the amount of the inorganic flocculant injected, the selected optimum polymer flocculant can be used continuously, and the selection of the polymer flocculant itself becomes easy.
- the dehydrated sludge can be further reduced in volume by reducing the water content, so that it is easy to handle and can be used for disposal. The work and cost required can be reduced.
- connection position of the water supply pipe may be any place of the inorganic flocculant injection pipe extending from the inorganic flocculant reservoir into the centrifuge, and can be installed flexibly according to the conditions of the apparatus configuration and the place of use. .
- the inorganic flocculant by supplying water to the inorganic flocculant injection tube while the centrifuge is in operation, the inorganic flocculant can be diluted efficiently and reliably in the inorganic flocculant injection tube. Can be injected. Therefore, the following operational effects are achieved.
- the inorganic flocculant solution is dispersed and separated because the diluted and increased amount of the inorganic flocculant solution is directly injected into the agglomerated sludge (separated sludge) that has undergone solid-liquid separation during the transition to the separated product discharge side of the pool.
- the sludge is quickly and widely injected into the sludge, which allows the solid-liquid separation of the separated sludge to proceed efficiently and reliably from the separated sludge despite the operation (inorganic flocculant injection) at the end of the dehydration concentration process.
- the separated liquid can be separated to obtain a dehydrated sludge having a lower water content, and in addition, since the inorganic flocculant can be efficiently injected, the amount used can be reduced.
- the inorganic flocculant is diluted and increased in advance, the inorganic flocculant solution is quickly and stably discharged from the flocculant discharge hole to the sludge supply chamber and smoothly separated into the sludge through the flocculant outlet.
- the inorganic flocculant solution can be evenly injected directly into the separated sludge, allowing the separated sludge and the inorganic flocculant to react quickly in a short time, further reducing the moisture content of the dewatered sludge more efficiently and reliably. be able to.
- the inorganic flocculant solution can be easily diluted (line mixed) in the inorganic flocculant injection pipe. Therefore, the degree of dilution (dilution ratio) can be changed quickly and arbitrarily in accordance with the operating state and the like, and more efficient operation is possible.
- the centrifuge when the centrifuge is mainly stopped, by supplying water to the inorganic flocculant injection pipe, the inorganic flocculant injection pipe, the inorganic flocculant discharge hole, the flocculant outlet, etc. are easily adhered and solidified. A site where the inorganic flocculant comes into contact can be reliably washed, and clogging or blockage by the inorganic flocculant can be prevented.
- inorganic coagulant discharge holes and coagulant outlets with small diameters are easily clogged, and once clogged, large maintenance work is required, but by supplying water (pumping) from the water supply pipe through the inorganic coagulant injection pipe.
- the adhesion-solidification-growth of the inorganic flocculant can be reliably prevented, and the centrifuge can be operated stably.
- the system can be washed reliably, the increase in equipment cost and the increase in maintenance work can be suppressed, the centrifuge can be properly maintained and managed, and safety can be ensured.
- the sludge supply chamber of the centrifuge is provided with a sludge supply port, a partition plate, and a flocculant outlet, and injected into the sludge supply chamber via an inorganic flocculant injection pipe.
- the structure is such that the inorganic flocculant easily flows out to the pool (especially the tapered portion on the separated material discharge side).
- a partition plate is provided between the sludge supply port in the sludge supply chamber and the flocculant outlet, and an inorganic flocculant discharge hole of the inorganic flocculant injection pipe is opened on the flocculant outlet side of the partition plate. Accordingly, the inorganic flocculant solution injected from the inorganic flocculant discharge hole of the inorganic flocculant injection pipe into the sludge supply chamber can be reliably guided to the flocculant outlet without being diffused in the sludge supply chamber.
- the inorganic flocculant solution that is smoothly guided to the flocculant outlet by the partition plate and flows out can be uniformly injected into the flocculated sludge (separated sludge) in which the solid-liquid separation is proceeding mainly to the separated product discharge side of the pool, It is possible to react quickly in a short time.
- the flocculant outlet when the flocculant outlet is provided in the vicinity of the two-stage taper (slowly inclined portion) of the outer shell bowl, the outer shell is moved to the separated material discharge side by the screw blades of the inner shell screw within the pool. ) Since the inorganic flocculant solution can be concentrated and injected into the separated sludge scraped up, the separated liquid can be efficiently and reliably separated from the separated sludge to obtain a dehydrated sludge having a lower water content. it can.
- the inorganic flocculant discharge hole of the inorganic flocculant injection pipe is opened in the vicinity of the flocculant outlet, the washing water is discharged from the inorganic flocculant discharge hole during cleaning in the centrifuge. Therefore, the inorganic flocculant discharge holes and the flocculant outlet that are easy to adhere and solidify and hard to wash can be sufficiently washed.
- the inorganic flocculant when the inorganic flocculant is supplied to the sludge in advance through the inorganic flocculant supply pipe (pre-stage supply), it is possible to generate strong flocculated flocs (aggregated sludge) that are easily solid-liquid separated. High solid-liquid separation performance can be demonstrated at the initial stage, and the processing amount can be maintained appropriately.
- pre-stage supply By supplying the inorganic flocculant to the sludge in advance (pre-stage supply) and forming the floc floc (aggregated sludge), the coagulation performance and The solid-liquid separation performance is further improved, and not only the water content of the separated product (dehydrated sludge) is lowered, but also the processing amount and the SS recovery rate can be improved.
- the inorganic flocculant can be supplied to the sludge in advance (pre-stage supply) and the sludge can be sufficiently reacted with the inorganic flocculant, the SS recovery rate is improved and the clarification of the separated liquid is improved.
- the phosphorus component contained in the sludge can be made into an insoluble salt and removed together with the separated substance, reducing the pollutant load on the wastewater treatment facility and suppressing the reflux of phosphorus.
- inorganic flocculant supplied to the sludge in advance pre-stage supply
- inorganic flocculant injected into the sludge supply chamber post-stage injection
- a phosphorus concentration measuring device for the separated liquid is provided.
- the supply amount and injection amount of the inorganic flocculant to the sludge, that is, the operation of the inorganic flocculant injection pump and the inorganic flocculant supply pump can be controlled.
- the inorganic flocculant when the inorganic flocculant is supplied to the sludge upstream with the inorganic flocculant supply pump and the inorganic flocculant is injected downstream into the sludge supply chamber with the inorganic flocculant injection pump, the inorganic flocculant is suitable for the sludge. (Appropriate amount) supplied and injected, the phosphorus contained in the sludge surely reacts with the inorganic flocculant to become an insoluble salt and is removed together with the separated matter, and the transfer of phosphorus to the separation liquid and the return to the wastewater treatment facility Can be suppressed.
- the inorganic flocculant when the inorganic flocculant is supplied to the sludge by the inorganic flocculant supply pump, not only phosphorus removal but also strong flocculated flocs (aggregated sludge) that are easy to separate into solid and liquid can be generated. Solid-liquid separation performance, clarity of the separation liquid (high SS recovery rate), reduction of SS of the separation liquid, reduction of inflow load to the wastewater treatment facility, etc. are obtained. As a result, the water quality (phosphorus, SS, organic matter) of the separated liquid that becomes the return water to the wastewater treatment facility can be prevented from deteriorating, and the proper discharged water quality can be maintained.
- the inorganic flocculant supply amount (pre-stage supply amount) by the inorganic flocculant supply pump is mainly adjusted to increase.
- it when it is low (small), it can be adjusted so as to reduce the supply amount of the inorganic flocculant, and phosphorus removal from the separation liquid can be performed stably.
- the sludge can be quickly and reliably supplied to the sludge according to the situation.
- the supply amount and injection amount of the inorganic flocculant can be controlled, and stable solid-liquid separation performance can be obtained, and the operation cost can be reduced, the labor can be saved, and the work can be reduced.
- the separation liquid when a circulation pipe for circulating the separation liquid is provided and connected to a water supply pipe, the separation liquid can be (re) used for water supply.
- the separation liquid in the cleaning process (when the centrifuge is stopped), the separation liquid is circulated and used in the water supply pipe, so that it is possible to save water usage and reduce water usage fees, which is effective for resource saving.
- the amount of water supplied through the water supply pipe can be increased by operating the circulation pump, and the water flow rate (water flow rate) and water pressure into the centrifuge increase, thereby improving the cleaning efficiency and enhancing the cleaning effect. Can do.
- the separation liquid is circulated through the water supply pipe, so that not only water consumption can be reduced and water charges can be reduced, but also in the separated separation liquid.
- Phosphorus remaining in the inorganic flocculant injection tube again contacts and reacts with the inorganic flocculant to form an insoluble salt, so that the phosphorus can be further removed.
- the inorganic flocculant component remains in the separation liquid, the remaining inorganic flocculant can be reused by circulating the separation liquid, and the use amount of the inorganic flocculant can be expected.
- polyferric sulfate, ferric chloride, polyaluminum chloride or the like is used as the inorganic flocculant.
- solid components of the sludge can be reliably agglomerated to produce a highly segregated floc (aggregated sludge) and can be removed as an insoluble salt by reacting with the phosphorus component contained in the sludge.
- a polymer flocculant in addition to the inorganic flocculant.
- Combined use of a polymer flocculant can reliably agglomerate the solid components of sludge and create a stronger flocculated floc (aggregated sludge) with higher separability and efficient solid-liquid separation (centrifugal dehydration).
- the polymer flocculant amphoteric polymer flocculants, cationic polymer flocculants, anionic polymer flocculants, and nonionic polymer flocculants are used.
- the amphoteric polymer flocculant is further fed to further agglomerate and form a large and strong sludge floc.
- Cationic polymer flocculants, anionic polymer flocculants, and nonionic polymer flocculants that can generate relatively strong sludge flocs alone may be used.
- a small amount of inorganic flocculant is supplied to sludge in advance.
- Nonionic polymer flocculants are effective when dewatering water sludge and the like.
- FIG. 3 is a schematic operation explanatory diagram in the centrifuge 1 of FIG. 2.
- 4A is a sectional view showing an example of the piping structure of the sludge supply pipe, polymer flocculant supply pipe, and inorganic flocculant injection pipe in FIG. 2, and
- FIG. 4B is an end view of FIG. 4A. is there.
- FIG. 5 shows a modification of FIG. 4, FIG.
- FIG. 5 (A) is a sectional view showing an example of the piping structure of a sludge supply pipe, a polymer flocculant supply pipe, and an inorganic flocculant injection pipe
- FIG. FIG. 6 is an end view of FIG.
- It is sectional drawing which shows the centrifuge apparatus by Embodiment 3 of this invention.
- It is sectional drawing which shows the centrifuge apparatus by Embodiment 4 of this invention.
- Embodiment 6 of this invention It is sectional drawing which shows the centrifuge apparatus by Embodiment 7 of this invention.
- FIG. 1 is a cross-sectional view showing a centrifugal separator according to Embodiment 1 of the present invention.
- the centrifugal separator according to the present invention includes a centrifugal separator 1 having an outer body bowl 3 and an inner body screw 4, and an inorganic flocculant discharge hole 23 a, and a sludge supply chamber disposed in the inner body screw 4.
- 7 has a basic structure provided with an inorganic flocculant injection pipe 23 for injecting an inorganic flocculant into the inside 7, and a water supply pipe 26 connected to the inorganic flocculant injection pipe 23 for supplying water.
- the centrifuge 1 includes a casing 2 having a separation liquid discharge port 2 a on one end side and a separated product discharge port 2 b on the other end side, and an outer body bowl 3 rotatably disposed in the casing 2.
- the inner body screw 4 rotatably disposed in the outer body bowl 3, the rotational drive unit 5 that rotationally drives the outer body bowl 3, the rotational drive unit 6 that rotationally drives the inner body screw 4,
- a differential speed adjuster (not shown) that provides a rotational difference between the body bowl 3 and the inner body screw 4 is provided, and a pool (concentration / dehydration zone) 10 is formed between the outer body bowl 3 and the inner body screw 4. It has a structure.
- the outer body bowl 3 has a cylindrical body 3a having a cylindrical shape on the separation liquid discharge side from an intermediate portion thereof, and tapered portions (narrow diameter portions) formed on the separation material discharge side are defined as two-stage tapers 3b and 3c. Forming.
- the two-step taper 3b, 3c is manufactured such that the two-step taper 3b below the water surface WL has a steep inclination and the two-step taper 3c on the water surface WL has a gentle inclination.
- Such a two-stage taper 3b, 3c increases the squeezing effect on the coagulated sludge by the screw blade 4c under the water surface WL and the residence time in the pool 10, and in particular the two-stage taper 3b that strongly receives the centrifugal effect.
- the residence time time for receiving the centrifugal effect
- the taper portion formed on the separated product discharge side of the outer shell bowl 3 is a first-stage taper 3d (see FIGS. 6 and 7) described later, high centrifugal separation (concentration / dehydration) performance can be obtained.
- the inner cylinder screw 4 includes a cylindrical straight body part 4a formed on the separation liquid discharge side from an intermediate part thereof, an inner cylinder taper 4b formed on the separated product discharge side, and the straight body part 4a and the inner cylinder screw 4a.
- the screw blade 4c is integrally formed on the outer periphery of the body taper 4b.
- the sludge supply chamber 7 includes a sludge supply port 7a, a flocculant outlet 7b, A partition plate 8 is provided.
- the sludge supply chamber 7 communicates with the outer body bowl 3 through a sludge supply port 7a provided in the straight body portion 4a of the inner body screw 4, and the flocculant outlet 7b is provided on the inner cylinder taper 4b, and on the inner peripheral surface of the inner cylinder taper 4b, the coagulant outlet 7b and the sludge supply port 7a on the straight body 4a side are provided in the vicinity of the coagulant outlet 7b.
- a partition plate 8 for partitioning is provided.
- the partition plate 8 is usually installed in a donut shape inside the sludge supply chamber 7, and a clearance (interval) with a sludge supply pipe 14 to be described later is normally set to 10 mm or less.
- a clearance (interval) with a sludge supply pipe 14 to be described later is normally set to 10 mm or less.
- the centrifuge 1 configured as described above is supplied with sludge into the sludge supply chamber 7 of the inner barrel screw 4 by the sludge supply pipe 14 connected to the sludge storage tank 11 from the sludge storage tank 11.
- This sludge supply pipe 14 is provided with a sludge supply pump 15.
- an inorganic flocculant solution is introduced into the sludge supply chamber 7 of the inner barrel screw 4 by an inorganic flocculant injection pipe 23 connected from the inorganic flocculant reservoir 13 to the inorganic flocculant reservoir 13 to the centrifuge 1.
- an inorganic flocculant discharge hole 23a that opens at a position corresponding to the flocculant outlet 7b is provided.
- the inorganic flocculant injection pipe 23 is provided with an inorganic flocculant injection pump 24 and a flow meter 25.
- a water supply pipe 26 is connected to the inorganic flocculant injection pipe 23 on the downstream side of the flow meter 25, and an automatic opening / closing valve 27 is provided in the water supply pipe 26.
- the inorganic flocculant injection pipe 23 to which the water supply pipe 26 is connected extends to the sludge supply pipe 14 at the downstream side of the connection portion of the water supply pipe 26, and the inorganic flocculant discharge hole 23a is the inner trunk taper 4b as described above. Is opened at a position corresponding to the flocculant outlet 7b.
- the purpose of supplying water to the inorganic flocculant injection pipe 23 by the water supply pipe 26 is mainly for washing when the centrifuge 1 is stopped and diluting the inorganic flocculant when the centrifuge 1 is operating.
- the cleaning water is supplied to the sludge supply pipe 14 and the centrifuge 1 together with the sludge supply pipe 14.
- the sludge supply chamber 7 and the pool 10 are cleaned.
- the main purpose of such cleaning is to remove sludge remaining in the apparatus (sludge cleaning), and it is difficult to clean the flocculant injection system (especially washing away the inorganic flocculant that tends to adhere and solidify).
- the inorganic flocculant discharge hole 23 a of the inorganic flocculant injection pipe 23 and the flocculant outlet 7 b provided in the inner cylinder taper 4 b are provided in the sludge supply chamber 7. In some cases, it is partitioned by the partition plate 8, and the normal cleaning cannot sufficiently clean the sludge and wash away the inorganic flocculant.
- a water supply pipe 26 is connected to the inorganic flocculant injection pipe 23 to supply water, and a flocculant injection system (mainly inorganic flocculant injection pipe, inorganic flocculant discharge)
- a flocculant injection system mainly inorganic flocculant injection pipe, inorganic flocculant discharge
- the pores, the flocculant outlet) and the like can be reliably and sufficiently washed.
- the inorganic flocculant is injected into the separated product discharge side of the pool 10 using the inorganic flocculant injection pipe 23 (the latter stage).
- the inorganic flocculant injection rate of the inorganic flocculant injection pipe 23 is 500 ppm, only a small amount of 500 mL is injected with respect to 1 m 3 of supplied sludge.
- the inorganic flocculant is directly injected as a stock solution, the solution concentration is very high, and the injection amount is also small.
- the reinjected inorganic flocculant solution quickly reaches the separated sludge and is difficult to mix efficiently. That is, it becomes a local reinjection of the inorganic flocculant, and the separated sludge cannot be sufficiently separated into solid and liquid, which may hinder the sludge dewatering treatment.
- a water supply pipe 26 is connected to the inorganic flocculant injection pipe 23 to supply water, and the inorganic flocculant solution to be injected is diluted (usually diluted 2 to 10 times) to increase the volume, thereby increasing the screw blade 4c in the pool 10.
- the inorganic flocculant is quickly and evenly mixed with the separated sludge that has been scraped up on the water surface WL while moving to the separated product discharge side, and good dewatering performance is obtained, and the separated sludge is dehydrated sufficiently efficiently. be able to.
- the inorganic flocculant injection pipe 23 for injecting the inorganic flocculant has a normal pipe shape and extends inside the sludge supply pipe 14 together with the sludge supply pipe 14 and opens in the sludge supply chamber 7. In this way, the diluted inorganic flocculant flows out to the pool 10 through the flocculant outlet 7b in the sludge supply chamber 7.
- a sludge supply pipe opening 14 a that opens in the sludge supply chamber 7 is formed at the tip of the sludge supply pipe 14.
- the sludge in the sludge storage tank 11 is supplied to the sludge supply chamber 7 of the centrifuge 1 via the sludge supply pipe 14 by the sludge supply pump 15.
- the inorganic flocculant in the inorganic flocculant storage tank 13 is transferred from the inorganic flocculant discharge hole 23a of the inorganic flocculant injection pipe 23 by the inorganic flocculant injection pump 24 to the small diameter side of the sludge supply chamber 7 (of the inner cylinder screw 4). Injection into the vicinity of the inner cylinder taper 4b (hereinafter referred to as “back injection”).
- the inorganic flocculant solution injected at the latter stage flows out from the flocculant outlet 7b of the inner cylinder screw 4 to the pool 10, and moves to the separated material discharge side (the separated material discharge port 2b side of the centrifuge 1) by the screw blade 4c. However, it is injected into the separated sludge (aggregated sludge in which solid-liquid separation has advanced by the centrifugal effect) that has been scraped up on the water surface WL of the pool 10 in the vicinity of the two-step taper 3c, which is a gently inclined region on the small diameter side of the outer bowl bowl 3.
- the separated sludge and the inorganic flocculant solution are mixed and reacted quickly, and the solid-liquid separation of the separated sludge (separation of the separated liquid and reduction of the water content) is promoted efficiently and 2-10 compared to the conventional method.
- a dehydrated sludge having a moisture content as low as about% can be obtained.
- the inorganic flocculant solution flowing in the inorganic flocculant injection pipe 23 is diluted with the water supplied from the water supply pipe 26 to increase the amount, and the increased diluted inorganic flocculant solution (hereinafter referred to as “diluted solution”) Since the sludge is quickly and widely injected into the separated sludge from the flocculant outlet 7b, the separated sludge and the inorganic flocculant are in contact with each other and react efficiently, and an efficient dewatering process that eliminates waste of the inorganic flocculant is possible. It becomes.
- the water supply is always performed during the operation of the centrifuge 1 (diluting the inorganic flocculant to reduce the concentration), so that the adhesion and solidification of the inorganic flocculant can be suppressed. Contributes to longer life.
- FIG. 2A is a cross-sectional view showing a centrifugal separator according to Embodiment 2 of the present invention
- FIG. 2B is an enlarged cross-sectional view of the main part of FIG. 2A, and the same components as FIG. The same reference numerals are given and redundant description is omitted.
- the centrifugal separator according to the second embodiment has a structure in which a polymer flocculant is used together with an inorganic flocculant and is supplied into the centrifuge 1, a plurality of inorganic flocculant discharge holes 23a, 23b, and 23c and those A plurality of partition plates 8a, 8b, 8c and flocculant outlets 7b, 7c, 7d corresponding to the above, and a point in which a water supply pump 28 is disposed downstream of the automatic opening / closing valve 27 in the water supply pipe 26, This is significantly different from the first embodiment.
- the centrifuge of the first embodiment supplies the polymer flocculant solution in the polymer flocculant reservoir 12 into the centrifuge 1, and therefore the polymer that opens in the sludge supply chamber 7.
- the polymer flocculant supply pipe 16 provided with the flocculant discharge port 16b is extended into the sludge supply pipe.
- the polymer flocculant supply pipe 16 is provided with a polymer flocculant supply pump 17, a flow meter 18, and an on-off valve 19 outside the sludge supply pipe 14.
- the water supply pipe 26 is provided with a water supply pump 28 and a flow meter 29 for quantitative water supply (mainly precision dilution).
- the inner cylinder taper 4b of the inner cylinder screw 4 is provided with a plurality of flocculant outlets 7b, 7c, 7d through which the diluted solution flows and a plurality of partition plates 8a, 8b, 8c corresponding to the respective outlets.
- the inorganic flocculant injection pipe 23 is provided with a plurality of inorganic flocculant discharge holes 23a, 23b, 23c that open at positions corresponding to the flocculant outlets 7b, 7c, 7d.
- FIG. 3 is a schematic explanatory view of the operation in the centrifuge 1 of FIG.
- sludge is supplied from the sludge supply pipe 14 to the sludge supply chamber 7, and the polymer flocculant solution is supplied from the polymer flocculant supply pipe 16 to the sludge supply chamber 7.
- the sludge (aggregated sludge) mixed with the polymer flocculant solution in the sludge supply chamber 7 is supplied to the pool 10 from the sludge supply port 7a, and solid-liquid separation proceeds by receiving a strong centrifugal force.
- the diluted inorganic flocculant solution (diluted solution) diluted and increased in the inorganic flocculant injection pipe 23 by the water supplied from the water supply pipe 26 becomes the inorganic flocculant discharge holes 23a, 23b, 23c of the inorganic flocculant injection pipe 23.
- solid-liquid separation is promoted efficiently and stably.
- FIG. 4A is a cross-sectional view showing an example of the piping structure of the sludge supply pipe 14, the polymer flocculant supply pipe 16, and the inorganic flocculant injection pipe 23 in FIGS. 2A and 2B.
- two pipes of a polymer flocculant supply pipe 16 and an inorganic flocculant injection pipe 23 are extended and arranged inside a sludge supply pipe 14 that is essential for a centrifugal separator.
- the structure of the inner cylinder screw 4 such as the bearings and seals can be simplified.
- FIG. 5 shows a modification of FIG. 4, and FIG. 5 (A) is a sectional view showing an example of the piping structure of the sludge supply pipe 14, the polymer flocculant supply pipe 16, and the inorganic flocculant injection pipe 23.
- FIG. 5B is an end view of FIG.
- the polymer flocculant supply pipe 16 (upper part) and the inorganic flocculant injection pipe 23 (lower part) formed in a semicircular cross section with a partition placed inside the sludge supply pipe 14. Are combined in a circular shape (donut shape) (so-called double pipe structure). Thereby, since there is no foreign substance in the sludge supply pipe 14, the inside of the pipe can be easily cleaned and problems such as blockage can be avoided.
- the piping structure of the sludge supply pipe 14, the polymer flocculant supply pipe 16, and the inorganic flocculant injection pipe 23 is not limited to this, and each flocculant is supplied and injected safely and appropriately by separating it from sludge. Any structure is possible if possible.
- the tip of the polymer flocculant supply pipe 16 is sealed as the double pipe structure (FIG. 5).
- a plurality of polymer flocculant discharge ports 16b may be provided around the vicinity, whereby the polymer flocculant can be supplied in multiple directions.
- the polymer flocculant solution is supplied to and mixed with the sludge in the sludge supply chamber 7, and the generated agglomerated sludge is supplied to the pool 10 from the sludge supply port 7a, and the screw blade 4c.
- Injecting the inorganic flocculant solution into the separated sludge (flocculated sludge that has progressed solid-liquid separation) that has been scraped up on the water surface WL while moving to the separated product discharge side (after-stage injection) makes it even more efficient and stable. This has the effect of promoting solid-liquid separation (separation of the separated liquid and reduction of the water content) of the separated sludge.
- the inorganic flocculant solution to be injected later into the separated sludge is diluted in advance with the water supplied from the water supply pipe 26 connected thereto in the inorganic flocculant injection pipe 23, and this diluted solution is added to the inorganic flocculant. It is discharged from a plurality of inorganic flocculant discharge holes 23a, 23b, 23c provided in the injection pipe 23, and is supplied from the flocculant outlets 7b, 7c, 7d provided in the inner cylinder screw 4 to the pool 10 (2 of the outer cylinder bowl 3). Therefore, the dilute solution can be injected quickly and widely into the separated sludge scraped up mainly on the water surface WL of the pool 10.
- the two-stage taper 3b, 3c of the outer shell bowl 3 into which the inorganic flocculant solution (diluted solution) is injected later is divided into two of the two-stage taper 3b having a steep inclination and the two-stage taper 3c having a gentle inclination.
- the step taper By adopting the step taper, it is possible to lengthen the drained portion of the separated sludge while suppressing the length of the centrifugal separator 1, and by quickly and widely injecting the inorganic flocculant solution in this portion, the inorganic flocculant and the separated substance Can be ensured for a longer period of time, which is very effective in reducing the water content of the separated product (dehydrated sludge).
- the taper portion of the outer shell bowl 3 is a one-step taper 3d, high centrifugal separation (dehydration) performance can be obtained.
- an inorganic flocculant solution (diluted solution) is injected into the separated sludge (flocculated sludge that has been subjected to solid-liquid separation by the centrifugal effect) scraped up on the water surface WL of the pool 10.
- an inorganic flocculant solution (diluted solution) may be injected from the flocculant outlet 7b into the water surface WL near the separation liquid discharge port 2a. Solid-liquid separation of the coagulated sludge and the water quality of the separated liquid can be improved.
- Example 1 An example of operation of the centrifugal separator according to the second embodiment is shown below.
- the implementation conditions are a high-efficiency centrifugal dehydrator for sewage mixed raw sludge, the operating conditions of the machine are processing volume 1.5m 3 / h, centrifugal effect 2000G, polymer flocculant injection (supply) rate 0.6%,
- a comparison was made between the conventional apparatus and the centrifugal separator according to the present invention under substantially the same conditions of a differential speed of 1.0 to 3.0 revolutions.
- the concentration of mixed raw sludge is 3.1% and the pH is 5.5.
- the results of the examples are shown in Table 1.
- a centrifugal separator that employs conventional inorganic flocculant upstream supply and polymer flocculant supply
- polyiron as an inorganic flocculant is supplied to the sludge supply pipe in advance (line supply) and mixed with raw sludge (previous supply)
- the water content of the dewatered sludge was 77.6%
- the SS recovery rate of the separated liquid was 98%
- the pH was 4.4 (mixed raw sludge pH 5.5). there were.
- the water content of dewatered sludge which is important for centrifugal dewatering, remains at 77.6%, and further reduction of the water content is required. There are concerns about problems such as corrosion of liquid piping.
- the polymer flocculant solution is supplied to the sludge supply pipe 14, and then diluted with feed water as the inorganic flocculant.
- feed water as the inorganic flocculant.
- the water content of the dehydrated sludge was 70.5%
- the recovery rate of SS in the separation liquid was 98%
- the pH was 5.2.
- the water content of the dewatered sludge is sufficiently reduced, the SS recovery rate is also good, and the pH of the separated liquid is 5.2, which is almost the same as that of the mixed raw sludge. It can be suppressed and proved to be very effective as a dehydration treatment.
- FIG. FIG. 6 is a sectional view showing a centrifugal separator according to Embodiment 3 of the present invention, and the same components as those in FIG.
- a cleaning main pipe 40 that supplies cleaning water mainly for cleaning the inside of the centrifuge 1 is connected to a sludge supply pipe 14 via an on-off valve 41, and the cleaning main pipe
- the point which connected the water supply branch pipe 26c as a water supply pipe branched from 40 through the on-off valve 42 to the inorganic flocculant injection pipe 23 differs greatly from the second embodiment.
- the taper portion of the outer shell bowl 3 is different from the second embodiment in that the taper portion of the outer shell bowl 3 is a one-step taper 3d.
- the water supply branch pipe 26c as the water supply pipe is branched from the main cleaning pipe 40 of the centrifuge 1 body and connected to the inorganic flocculant injection pipe 23.
- a water supply pipe 26 connected to the inorganic flocculant injection pipe 23 is provided in the same manner as in the second embodiment, and the water supply main pipe 40 is formed by branching the water supply pipe 26. It may be connected to the sludge supply pipe 14 via the on-off valve 41, and the same effect as described above can be obtained even with such a structure.
- the polymer flocculant supply pipe 16 is connected to the sludge supply pipe 14 so that the polymer flocculant solution can be supplied to the sludge in advance. That is, depending on the type of the polymer flocculant, it is necessary to take a long reaction (contact) time with the sludge. Therefore, a line supply method for supplying the polymer flocculant solution to the sludge supply pipe 14 is adopted, The polymer flocculant solution was sufficiently mixed so as to be able to react.
- FIG. 7 is a cross-sectional view showing a centrifugal separator according to Embodiment 4 of the present invention.
- the centrifugal separator according to the fourth embodiment is different from the second embodiment in that a water supply pipe 26 is connected to the inorganic flocculant injection pipe 23 on the upstream side of the inorganic flocculant injection pump 24.
- the inorganic flocculant injection pipe 23 is connected to the inorganic flocculant reservoir 13 through an on-off valve 43 on the upstream side of the inorganic flocculant injection pump 24, and the water supply pipe 26 is injected with the inorganic flocculant through an on-off valve 44.
- the tube 23 is connected between the inorganic flocculant injection pump 24 and the on-off valve 43.
- the fourth embodiment by connecting the water supply pipe 26 to the upstream side of the inorganic flocculant injection pump 24, there is an action of the inorganic flocculant injection pump 24, so that the dilution water and the inorganic flocculant solution are sufficient.
- a diluted solution (diluted inorganic flocculant solution diluted and increased in the inorganic flocculant injection pipe 23 by water supplied from the water supply pipe 26) is rapidly and surely homogenized and further homogenized. Separation sludge and dilute solution can be mixed efficiently, and solid-liquid separation (separation of separated liquid and reduction of water content) is promoted.
- the inorganic flocculant system inorganic flocculant injection tube 23 23, the inside of the inorganic flocculant injection pump 24, the flow meter 25, etc.
- the water supply by the water supply pipe 26 may be provided with an independent water supply facility as in the second embodiment, or may be a water supply facility that also serves to clean the centrifuge 1 as in the third embodiment.
- Embodiment 5 When the inorganic flocculant is not supplied to the sludge in advance, or when the sludge and the injected inorganic flocculant cannot sufficiently react, the clarification (SS recovery rate) of the separated liquid is deteriorated, or phosphorus contained in the sludge
- the inorganic flocculant is supplied to the sludge in advance (pre-stage supply) because the water quality of the separation liquid may deteriorate, for example, the phosphorus concentration increases due to transfer to the separation liquid without being removed. It has a structure to keep.
- FIG. 8 is a cross-sectional view showing a centrifugal separator according to Embodiment 5 of the present invention.
- the inorganic flocculant supply pipe 20 extending from the inorganic flocculant storage tank 13 is connected upstream of the sludge supply pipe 14 (the sludge supply pump 15 and the polymer flocculent) as the inorganic flocculant upstream supply means.
- the inorganic flocculant supply pipe 20 are provided with an inorganic flocculant supply pump 21 and a flow meter 22, and the inorganic flocculant is supplied as a post-injection means of the inorganic flocculant.
- An inorganic flocculant injection pipe 23 is branched on the upstream side of the pump 21 (between the inorganic flocculant storage tank 13 and the inorganic flocculant supply pump 21).
- a flow meter 25 is provided.
- Other structures are the same as those of the first embodiment (FIG. 1).
- the inorganic flocculant supply pipe 20 provided as the inorganic flocculant upstream supply means, and the inorganic flocculant branched from the inorganic flocculant supply pipe 20 as the inorganic flocculant subsequent injection means.
- An inorganic flocculant supply pump 21 and an inorganic flocculant injection pump 24 are individually provided in each of the injection pipes 23, and the upstream supply of the inorganic flocculant solution from the inorganic flocculant supply pipe 20 and the inorganic flocculant injection Since the subsequent injection of the inorganic flocculant solution from the pipe 23 is performed independently, the inorganic flocculant solution can be first supplied to the sludge in the sludge supply pipe 14, and then the polymer flocculant solution to be supplied thereafter Can produce large and strong coagulation flocs, further improve the solid-liquid separation performance in the centrifuge 1, and increase the clarity of the dehydrated separation liquid (improvement of SS recovery rate).
- the water quality of the dehydrated separation liquid is improved, such as by removing phosphorus (eutrophication substance), and the inorganic flocculant solution (diluted solution) is injected again from the inorganic flocculant injection tube 23 (subsequent injection) to make a leap forward.
- the moisture content of the dewatered sludge can be reduced.
- the inorganic flocculant injection pipe 23 is branched from the inorganic flocculant supply pipe 20, but the present invention is not limited to this, and conversely, for example, the inorganic flocculant supply pipe 20 is branched from the inorganic flocculant injection pipe 23. Any structure may be used as long as the inorganic flocculant solution is supplied from the inorganic flocculant reservoir 13 to the sludge and then injected into the separated sludge.
- the outer body bowl 3 is formed as a cylindrical straight body portion 3a on the separation liquid discharge side and a tapered portion (narrow diameter portion) formed of two-step tapers 3b and 3c on the separation material discharge side. .
- the two-step taper 3b, 3c is manufactured such that the two-step taper 3b below the water surface WL has a steep inclination and the two-step taper 3c on the water surface WL has a gentle inclination.
- FIG. 9 is a cross-sectional view showing a centrifugal separator according to Embodiment 6 of the present invention.
- the centrifugal separator according to the sixth embodiment has a structure in which two types of inorganic flocculants (inorganic flocculant A and inorganic flocculant B) are used in combination. Therefore, a separate inorganic flocculant reservoir 13A is provided separately from the inorganic flocculant reservoir 13, and the inorganic flocculant supply pipe 20 extending from the previous inorganic flocculant reservoir 13A is connected to the sludge supply pipe 14 to provide a sludge supply pipe. 14, the inorganic flocculant A solution can be supplied to the sludge in the previous stage.
- ⁇ Inorganic flocculants have different characteristics depending on the type.
- ferric sulfate polyiron
- polyiron has a large specific gravity and is very effective for sludge dewatering treatment.
- the pH is low and the buffering capacity is large, it is easy to lower the pH of the coagulated sludge.
- Polyaluminum chloride (PAC) is lighter in specific gravity than polyiron and inferior in dehydration performance (lower water content) to polyiron, but has a low pH buffering capacity and is difficult to lower the pH of the coagulated sludge.
- the action of removing phosphorus insoluble chloride of phosphorus contained in the sludge is the same for both polyiron and PAC.
- FIG. 10 is a cross-sectional view showing a centrifugal separator according to Embodiment 7 of the present invention
- FIG. 11 is an enlarged cross-sectional view showing a main part of FIG.
- the centrifugal separator according to the seventh embodiment has a polymer flocculant provided with a polymer flocculant discharge port 16b that opens in the sludge supply chamber 7 in order to supply the polymer flocculant solution into the sludge supply chamber 7.
- the sludge supply chamber 7 has a structure in which the supply pipe 16 is extended into the sludge supply pipe 14 and the upstream supply of the inorganic flocculant to the sludge is performed in the sludge supply chamber 7 in the same manner as the polymer flocculant.
- the inorganic flocculant supply pipe opening 20 a (see FIG. 11) provided in the inside is extended into the sludge supply pipe 14.
- one kind of inorganic flocculant is used in both the upstream supply and the subsequent injection, and the water supply pipe 26 is branched into branch pipes 26a and 26b to supply water to the inorganic flocculant supply pipe 20 and the inorganic flocculant injection pipe 23 (washing). And dilution).
- an inorganic flocculant supply pipe 20 supplied upstream with an inorganic flocculant and an inorganic flocculant injection pipe 23 used for subsequent injection are connected to one inorganic flocculant reservoir 13.
- the inorganic flocculant supply pipe 20, the inorganic flocculant injection pipe 23, and the polymer flocculant supply pipe 16 are extended and disposed in the sludge supply pipe 14.
- the water supply pipe 26 is branched into the branch pipes 26a and 26b on the downstream side of the automatic opening / closing valve 27, one branch pipe 26a is connected to the inorganic flocculant injection pipe 23, and the other branch pipe 26b is supplied with the inorganic flocculant.
- the inorganic flocculant storage tank 13 of the pipe 20 and the inorganic flocculant supply pump 21 are connected.
- the branch pipe 26a of the water supply pipe 26 is provided with an open / close valve 37, and the branch pipe 26b is provided with an open / close valve 38.
- the inorganic flocculant supply pipe 20 is provided with an inorganic flocculant supply pump 21 and a flow meter 22, and the inorganic flocculant injection pipe 23 is provided with an inorganic flocculant injection pump 24 and a flow meter 25.
- the inorganic flocculant supply pipe 20 is an inorganic flocculant solution.
- the sludge supplied from the supply pipe opening 20a to the sludge supplied into the sludge supply chamber 7 is directly supplied (supplied upstream in the inorganic machine), and the inorganic flocculant injection pipe 23 supplies the inorganic flocculant solution to the inorganic flocculant discharge hole 23a.
- the tube 16 supplies the polymer flocculant solution from the polymer flocculant discharge port 16b to the pool 10 (flocculated sludge flowing out from the sludge supply port 7a to the pool 10) via the flocculant outlet 7e (polymer). So that the stage supply) to.
- the inorganic flocculant supply pipe 20 and the inorganic flocculant injection pipe 23 can be washed with water supplied from the branch water supply pipe 26b, and the inorganic flocculant solution injected from the inorganic flocculant injection pipe 23 is supplied with the water supply branch pipe. It can be diluted with feed water from 26a.
- the sludge supply chamber 7 that is rotating rapidly is provided by supplying the inorganic flocculant upstream and the polymer flocculant in the sludge supply chamber 7 of the centrifuge 1.
- the sludge and the inorganic flocculant supplied in the previous stage are mixed, and the generated flocculent sludge flows out to the pool 10 through the sludge supply port 7a, and the polymer flocculant flowing out from the flocculant outlet 7e there Since it is supplied, it becomes a strong agglomerated sludge with high solid-liquid separation.
- agglomeration flock (aggregated sludge) is generated in the sludge supply pipe 14, but this agglomerated sludge is supplied as sludge. It will repeatedly collide with the wall surface etc.
- the polymer flocculant is supplied into the pool 10 via the flocculant outlet 7e (previous supply in the inorganic machine / mid-polymer supply), thereby preventing the disaggregation of the floc flocs. Can do.
- the sludge is supplied to the vicinity of the sludge supply port 7a from the sludge supply pipe opening 14a of the sludge supply pipe 14 extending into the sludge supply chamber 7, and the sludge supply pipe 14 is provided.
- the inorganic flocculant is supplied upstream from the inorganic flocculant supply pipe opening 20 a of the inorganic flocculant supply pipe 20 that is extended and disposed therein, and the sludge and the inorganic flocculant are first mixed in the sludge supply chamber 7.
- the polymer flocculant is fed from the polymer flocculant discharge port 16b opened on the side surface of the polymer flocculant supply pipe 16 extended and disposed in the sludge supply pipe 14 to the partition plate 8d provided in the straight body portion 4a.
- the middle stage is supplied to the pool 10 (aggregated sludge flowing out from the sludge supply port 7a to the pool 10) through the coagulant outlet 7e opened in the vicinity, and the aggregated sludge and the polymer coagulant are mixed.
- the inorganic flocculant is opened in the vicinity of the partition plate 8 provided in the inner body taper 4b from the inorganic flocculant discharge hole 23a opened in the side surface of the inorganic flocculant injection pipe 23 extended and disposed in the sludge supply pipe 14. Then, it is injected into the pool 10 (separated sludge scraped up by the screw blade 4c on the water surface WL of the pool 10) through the flocculant outlet 7b, and the separated sludge and the inorganic flocculant mix.
- the inside of the centrifuge 1 By configuring the inside of the centrifuge 1 in this way, it is possible to supply and inject the inorganic flocculant and the polymer flocculent accurately and efficiently to the sludge, and to suppress the breakage of the flocculent flocs.
- the liquid separation performance is demonstrated, the water content of the dewatered sludge can be further reduced, and the amount of chemicals used can also be reduced.
- the inorganic flocculant supply pipe 20, the polymer supply pipe 16 and the inorganic flocculant injection pipe 23 are extended in the sludge supply pipe 14 (for example, three narrow tubes as shown in FIG. 4 are provided. It was extended separately, or the outer tube was divided into three as a double tube structure as shown in FIG. 5), but is not limited to this, and each tube is separately extended into the sludge supply chamber 7. Any structure can be used as long as each flocculant can be supplied and injected smoothly.
- FIG. FIG. 12 is a sectional view showing a centrifugal separator according to Embodiment 8 of the present invention.
- the same components as those in FIGS. 10 and 11 are denoted by the same reference numerals, and redundant description is omitted.
- the inorganic flocculant supply pipe 20 is extended to the sludge supply chamber 7 and the upstream supply of the inorganic flocculant is performed in the sludge supply chamber 7.
- the inorganic flocculant supply pipe 20 is connected to the sludge supply pipe 14 in order to sufficiently react the sludge and the inorganic flocculant supplied in the previous stage, and the inorganic flocculant is supplied to the sludge in the sludge supply pipe 14 in the previous stage ( Line supply).
- the sludge and the inorganic flocculant supplied in the previous stage are sufficiently mixed, and it is possible to reliably produce agglomeration flocs, and the phosphorus contained in the sludge is made into an insoluble salt, so that the phosphorus concentration of the separation liquid Can also be reduced.
- the connecting position of the inorganic flocculant supply pipe 20 to the sludge supply pipe 14 may be any place between the sludge storage tank 11 and the centrifuge 1.
- FIG. FIG. 13 is a cross-sectional view showing a centrifugal separator according to Embodiment 9 of the present invention
- FIG. 14 is an enlarged cross-sectional view showing the main part of FIG. 13, and the same components as in FIGS. A reference numeral is attached and a duplicate description is omitted.
- the separation liquid discharge side partition plate 8d provided in the straight body portion 4a of the sludge supply chamber 7 in the centrifugal separator of the seventh embodiment (FIG. 10) and the vicinity of the partition plate 8d.
- the flocculant outlet 7e on the separation liquid discharge side from which the supplied polymer flocculant flows out is omitted, and the interval between the sludge supply pipe opening 20a and the sludge supply port 7a is widened.
- the water supply pipe 26 is not branched as in FIG. 8 and is connected to the inorganic flocculant injection pipe 23.
- Sludge is supplied from the sludge supply pipe opening 14a of the sludge supply pipe 14 extending into the sludge supply chamber 7 toward the sludge supply port 7a.
- the inorganic flocculant is also supplied upstream from the inorganic flocculant supply pipe opening 20a of the inorganic flocculant supply pipe 20 extended in the sludge supply pipe 14 in the direction of the sludge supply port 7a. Sludge and inorganic flocculant are mixed first.
- the polymer flocculant is discharged toward the inner wall of the sludge supply chamber 7 from the polymer flocculant discharge port 16b opened on the side surface of the polymer flocculant supply pipe 16 extended in the sludge supply pipe 14 (middle supply). ) And flows out from the sludge supply port 7a to the pool 10 mainly through this inner wall.
- the polymer flocculant supplied in the middle stage is mixed with sludge (flocculated sludge) in the pool 10 from the sludge supply chamber 7.
- the inorganic flocculant from the inorganic flocculant discharge hole 23a opened on the side surface of the inorganic flocculant injection pipe 23 extended and disposed in the sludge supply pipe 14 is in the vicinity of the partition plate 8 provided in the inner trunk taper 4b. It is injected into the pool 10 (separated sludge scraped up by the screw blade 4c on the water surface WL of the pool 10) via the opening flocculant outlet 7b, and the separated sludge and the inorganic flocculant mix.
- the polymer flocculant can be mixed with the agglomerated sludge produced by mixing the sludge and the inorganic flocculant supplied in the previous stage, so that it is quick and efficient despite the simple structure. Strong cohesive floc can be formed.
- the agglomerated sludge is subjected to solid-liquid separation by receiving a strong centrifugal force in the pool 10, and an inorganic flocculant is subsequently injected into the separated sludge that has been scraped up by the screw blade 4c on the water surface WL of the pool 10, and further the solid-liquid separation is performed. move on.
- the inside of the centrifuge 1 By configuring the inside of the centrifuge 1 in this way, the inorganic flocculant and the polymer flocculant can be supplied and injected accurately and efficiently to the sludge, as in the seventh embodiment. Destruction can be suppressed, good solid-liquid separation performance can be demonstrated, the moisture content of dewatered sludge can be further reduced, the amount of chemicals used can be reduced, and the structure in the sludge supply chamber 7 can be simplified. Can do. In addition, it is preferable that the shape of the sludge supply chamber 7 is provided with an inclination (narrowed) toward the separated discharge side as a whole.
- the polymer flocculant discharge port 16b is opened on the side surface of the polymer flocculant supply pipe 16, but the present invention is not limited to this, and the polymer flocculant discharge port 16b may be discharged in the direction of the sludge supply port 7a. Any structure capable of supplying the polymer flocculant to the sludge in the middle stage may be used.
- FIG. FIG. 15 is a sectional view showing a centrifugal separator according to the tenth embodiment of the present invention.
- the inorganic flocculant supply pipe 20 is extended to the sludge supply chamber 7, and the first stage supply of the inorganic flocculant is performed in the sludge supply chamber 7.
- the inorganic flocculant supply pipe 20 is connected to the sludge supply pipe 14 in order to sufficiently react the sludge and the inorganic flocculant supplied in the previous stage, and the inorganic flocculant is supplied to the sludge in the sludge supply pipe 14 in the previous stage ( Line supply).
- the sludge and the inorganic flocculant supplied in the previous stage are sufficiently mixed, and it is possible to surely generate agglomeration flocs, and the phosphorus contained in the sludge is converted into an insoluble salt, so that the phosphorus concentration of the separated liquid Can also be reduced.
- the connecting position of the inorganic flocculant supply pipe 20 to the sludge supply pipe 14 may be any place between the sludge storage tank 11 and the centrifuge 1.
- Example 2 An example of the operation of the centrifugal separator according to Embodiments 5 to 10 (FIGS. 8 to 15) and the like will be described below.
- the implementation conditions are high-efficiency centrifugal dehydrators for sewage digested sludge.
- the operating conditions of the dehydrators are 1.5 m 3 / h throughput, centrifugal effect 2500 G, amphoteric polymer flocculant injection rate 1.2%, differential speed A comparison was made between the conventional apparatus and the centrifugal separator according to the present invention under substantially the same conditions of 1.3 to 1.5 revolutions.
- the sewage digested sludge to be treated has a concentration of 1.5%, a phosphorus concentration of about 600 mg / L, and a pH of 7.4. Examples are shown in Table 2.
- a centrifugal separator employing conventional inorganic flocculant upstream supply and polymer flocculant injection
- polyiron is supplied to the sludge supply pipe in advance as an inorganic flocculant and mixed with raw sludge (previous stage supply)
- the amphoteric polymer flocculant was injected into the line and subjected to centrifugal dehydration
- the water content of the dewatered sludge was 78.5%
- the phosphorus concentration of the separated liquid was 10 mg / L
- the SS recovery rate was 98%.
- the amphoteric polymer flocculant is line-fed to the sludge supply pipe 14, and then When polyiron was directly injected into the sludge supply chamber 7 as an inorganic flocculant (after-stage injection) and centrifugal dewatered, the moisture content of the dewatered sludge important in sludge treatment was 74.0%, and a very good result was obtained. However, the phosphorus concentration in the separation liquid was 250 mg / L, and the SS recovery rate was 96%.
- polyiron is used as the inorganic flocculant in the sludge supply pipe 14 and the sludge supply chamber 7. After that, the amphoteric polymer flocculant is supplied into the sludge supply pipe 14 and the sludge supply chamber 7 (line supply and middle stage supply), and further, polyiron is added using the inorganic flocculant injection pipe 23.
- FIG. FIG. 16 is a cross-sectional view showing a centrifugal separator according to Embodiment 11 of the present invention, and the same or corresponding components as those in FIG.
- the centrifuge of the eleventh embodiment is provided with a phosphorus concentration measuring device 31 for measuring the phosphorus concentration of the separation liquid in order to grasp the phosphorus removal status, and based on the phosphorus concentration measured by the phosphorus concentration measuring device 31,
- a controller 30 for controlling (controlling the flow rate) the operation of the inorganic flocculant supply pump 21 for the front stage supply and the inorganic flocculant injection pump 24 for the rear stage injection is provided. Further, as in the case of the sixth embodiment shown in FIG.
- the first-stage inorganic flocculant has a structure in which two types of inorganic flocculants are used in combination, and stores the inorganic flocculant solution separately from the inorganic flocculant reservoir 13.
- a storage tank 13 ⁇ / b> A was provided, and the inorganic flocculant for the previous stage supply was supplied to the sludge storage tank 11 by the inorganic flocculant supply pipe 20 connected thereto.
- the phosphorus concentration in the separation liquid decreases in proportion to the supply / injection rate (amount) of the inorganic flocculant when the sludge concentration and the operating conditions of the dehydrator are the same. That is, the phosphorus component contained in the sludge can be reacted with the inorganic flocculant to be converted into an insoluble salt and removed together with the separated product, so that the phosphorus concentration of the separation liquid is lowered. From this, it is possible to accurately adjust the phosphorus concentration in the separation liquid by controlling the supply and injection of the inorganic flocculant while checking the phosphorus concentration in the separation liquid, in particular, the amount supplied by the inorganic flocculant supply pump 21 (stable Can be reduced).
- the phosphorus concentration measuring device 31 may be a phosphorus concentration automatic measuring device 31, a measurement by manual analysis, or a simple analysis by a pack test or the like.
- the controller 30 can increase or decrease the output of the inorganic flocculant supply pump 21 or the like based on the measured phosphorus concentration value (output signal) (inverter), or can manually adjust the inorganic flocculant supply pump 21 or the like from the analysis result of the phosphorus concentration. Any flow rate can be used as long as the flow rate can be increased or decreased.
- the inorganic flocculant supply pipe 20 is extended from the preceding stage inorganic flocculant storage tank 13A to the sludge storage tank 11, and the inorganic flocculant is stored in the sludge.
- former stage supply could be carried out to the tank 11, it is not restricted to this, What is necessary is just a structure which can fully mix a sludge and an inorganic flocculant.
- the phosphorus concentration measuring device 31 and the controller 30 in the eleventh embodiment described above can also be applied to the centrifuges of the first to tenth embodiments and the thirteenth embodiment to be described later.
- the flow rates of the inorganic flocculant supply pump 21 and the inorganic flocculant injection pump 24 in the centrifugal separators of Embodiments 1 to 10 and 13 can be appropriately controlled.
- FIG. FIG. 17 is a cross-sectional view showing a centrifugal separator according to Embodiment 12 of the present invention.
- the centrifuge of the twelfth embodiment is configured to use both the inorganic flocculant supplied in the previous stage and the inorganic flocculant injected in the subsequent stage, and the inorganic flocculant supply pump 21 and the inorganic flocculant injection pump 24 shown in FIG.
- One inorganic flocculant supply pump 21 (which may be the inorganic flocculant injection pump 24) is also used, and an open / close valve is provided in the inorganic flocculant supply pipe 20 to adjust the supply amount and injection amount of the inorganic flocculant.
- the inorganic flocculant injection pipe 23 is provided with an opening / closing valve 33 in the inorganic flocculant injection pipe 23, and further, as means for controlling the opening / closing and opening of these opening / closing valves 32, 33, external factors (for example, phosphorus concentration of the separation liquid, pH of the separation liquid, etc.) ) Is provided, and the supply and injection of the inorganic flocculant can be automated.
- external factors for example, phosphorus concentration of the separation liquid, pH of the separation liquid, etc.
- the inorganic flocculant supply system and the injection system pump are only one of the inorganic flocculant injection pump 21 (may be the inorganic flocculant injection pump 24), and the initial cost can be reduced. And space saving.
- the controller 30A measures the concentration of phosphorus in the sludge and the separation liquid and the pH of the separation liquid as described above, and outputs the on / off valves 32 and 33 according to the output signal.
- the opening / closing and opening For the purpose of controlling the opening / closing and opening, and for the purpose of reducing the moisture content of dewatered sludge, measure the sludge amount (treatment amount), the moisture content and viscosity of the dewatered sludge, and use the output signal to open and close the valve.
- the opening and closing and opening of 32 and 33 For the purpose of controlling the opening and closing and opening of 32 and 33, and for the purpose of improving the SS recovery rate, measure the SS concentration, transparency, light transmittance, etc. of the separation liquid, and open / close by the output signal
- What can control the opening and closing and the opening degree of the valves 32 and 33 can be used. For example, when removing phosphorus from the separation liquid and the phosphorus concentration in the sludge is low, the upstream supply amount of the inorganic flocculant is reduced and the subsequent injection amount is increased.
- FIG. FIG. 19 is a cross-sectional view showing a centrifugal separator according to a thirteenth embodiment of the present invention. The same components as those in FIG.
- inorganic flocculant injection system when a cleaning facility is provided to remove and wash the inorganic flocculant that tends to harden or prevent clogging, normal tap water (industrial water) or groundwater is used. If sufficient cleaning is performed, operation costs such as water charges will increase. Further, if a large amount of tap water is used to enhance the cleaning effect, not only will the water charge increase, but the processing of the cleaning wastewater will become a heavy burden, and this will go back to resource saving.
- the centrifugal separator according to the thirteenth embodiment, a part of the separation liquid discharged from the centrifugal separator 1 is supplied to the water supply pipe 26 via the separation liquid circulation pipe 34 (as dilution water and washing water). ) The separation liquid is reused.
- the separation liquid circulation pipe 34 is provided with a separation liquid circulation pump 35 and an on-off valve 36 for circulating the separation liquid.
- the normal washing water amount is 4 m 3 / h
- the washing time is 10 to Although it takes about 15 minutes
- the separation liquid circulation rate is 3 m 3 / h by circulating the separation liquid
- the total amount of washing water supplied to the centrifuge 1 is 7 m 3 / h, which increases the amount of water supply.
- the water flow rate (water flow rate) in the centrifuge 1 and the like increased, and the washing efficiency was improved and washing could be performed in about 5 minutes.
- scale (calcium-based) is generated in the water supply pipe 26 and the like due to long-term use, and the inorganic flocculant injection pipe 23, inorganic flocculant discharge holes 23a, 23b, 23c, flocculant outlets 7b, 7c, Since clogging (stenosis) such as 7d and 7e may occur, it is preferable to provide an acid cleaning facility.
- the separation liquid By circulating the separation liquid during operation of the centrifugal separator 1, it can be used for diluting the inorganic flocculant.
- the inorganic flocculant When the inorganic flocculant is injected into the sludge supply chamber 7 later, The inorganic flocculant quickly and evenly spreads and mixes in the separated sludge, and good dewatering performance is obtained.
- the advantage of using the separated liquid for dilution is that the separated liquid is separated from sludge and has similar properties to sludge, so that the pH of the diluted inorganic flocculant to be injected later is appropriately maintained (acidified). Can be suppressed).
- the optimum pH of polyiron and the like is about 5 to 6 at the time of aggregation. For example, when using groundwater (well water), etc., the pH of groundwater is usually low and the pH of polyiron is low. Deviation (lower pH) may occur, and new pH adjustment is required.
- the pH of the separated liquid is as high as about 8 in the case of digested sludge dehydration, for example, and even if the inorganic flocculant is diluted by circulating the separated liquid, the pH hardly fluctuates and is stably dehydrated. Can be done.
- the separation liquid is usually centrifuged with a high centrifugal effect of 2000G or higher, and the water quality is also good (SS low concentration), even if the separation liquid is recycled to dilute the inorganic flocculant, the separation liquid There is almost no influence on the water quality (the use of diluted water that does not have a favorable water quality, such as a mixture of many fine particles, may deteriorate the water quality of the separated liquid).
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Abstract
Description
(1) 脱水汚泥の低含水率化のために、2種類の凝集剤溶液を汚泥に多く供給する必要があるときには、薬品使用量が増大し、運転コストの上昇を招くばかりか運転管理が煩雑化する。
(2) 無機凝集剤溶液を多量に注入した場合、薬品混合汚泥(凝集汚泥)のpHが大きく低下して、濃縮処理や脱水処理に影響を及ぼすばかりか、遠心分離機等の内部を腐食させる恐れがある。
(3) そこで、低pH化した薬品混合汚泥を中和させるためにアルカリ薬品(苛性ソーダ溶液)等を薬品混合汚泥に供給すると、さらに運転コストの上昇を招き、運転管理をよりいっそう煩雑にさせてしまう。また、原汚泥に多量の薬品を供給した場合、濃縮汚泥や脱水汚泥に各種薬品成分が高濃度に残留し、有効利用(堆肥化や燃料化)に支障をきたす恐れもある。
(4) 汚泥に無機凝集剤溶液を供給することにより、薬品混合汚泥(凝集汚泥)のpHが低下したりカチオン度が上昇したりするが、この度合いが無機凝集剤の供給量の多少により異なる。これに伴い、適切な高分子凝集剤やその供給量も異なってくるため、最適な高分子凝集剤の選定や供給量の決定など作業が煩雑になる。
(5) 運転コストを増大させず煩雑な運転管理にならないように凝集剤(無機、高分子)の使用量を抑えると、分離物(脱水汚泥)の含水率を低減できず、取り扱いづらくなるばかりか、分離物の容積が増大してしまい、その後の処理処分に支障を来す。 In the sludge dewatering process by the “two-component method” using a conventional centrifuge, the following problems occurred.
(1) When it is necessary to supply two types of flocculant solutions to the sludge in order to reduce the water content of the dewatered sludge, the amount of chemicals used increases and the operation cost increases, and the operation management is complicated. Turn into.
(2) When a large amount of inorganic flocculant solution is injected, the pH of the chemical mixed sludge (aggregated sludge) is greatly reduced, affecting not only concentration and dehydration, but also corroding the inside of the centrifuge, etc. There is a fear.
(3) Therefore, supplying alkaline chemicals (caustic soda solution) etc. to the chemical mixed sludge to neutralize the low pH chemical mixed sludge further increases the operating cost and makes the operation management more complicated. End up. In addition, when a large amount of chemicals is supplied to the raw sludge, various chemical components remain in the concentrated sludge and dewatered sludge in a high concentration, which may hinder effective use (composting and fueling).
(4) By supplying the inorganic flocculant solution to the sludge, the pH of the chemical mixed sludge (flocculated sludge) decreases or the cation degree increases, but this degree varies depending on the amount of the inorganic flocculant supplied. . Along with this, the appropriate polymer flocculant and its supply amount also differ, and the work such as selection of the optimum polymer flocculant and determination of the supply amount becomes complicated.
(5) If the amount of coagulant (inorganic or polymer) is suppressed so as not to increase the operating cost and complicated operation management, the water content of the separated material (dehydrated sludge) cannot be reduced and it becomes difficult to handle. Or the volume of a separated substance will increase and will interfere with subsequent disposal.
また、汚泥に多量の無機凝集剤溶液を注入した場合、無機凝集剤の固まりは、凝集汚泥の供給管(汚泥供給管)だけではなく、遠心分離機内で開口する汚泥供給管の出口や遠心分離機内の汚泥供給室に設けられた汚泥供給口にも発生し、濃縮処理や脱水処理に支障を来すという課題があった。 For the inorganic flocculant solution supply pipe, the inorganic flocculant solution tends to harden at joints with other pipes, curved (refractive) portions, injection port portions, etc., and when the solid grows, the inorganic flocculant solution is clogged and clogged. There was a problem that the supply of cereals was stopped and the concentration process and dehydration process were hindered.
In addition, when a large amount of the inorganic flocculant solution is injected into the sludge, not only the flocculant sludge supply pipe (sludge supply pipe) but also the outlet of the sludge supply pipe that opens in the centrifuge and centrifugal separation are used. It also occurred at the sludge supply port provided in the sludge supply chamber in the machine, and there was a problem that it interfered with the concentration treatment and dehydration treatment.
とくに洗浄効果を得るために多量の水道水を使用すると、水道料金が増大するばかりでなく、洗浄排水の処理が大きな負担となるばかりか省資源化に逆行する結果となる。 When a cleaning facility is provided for removing the inorganic flocculant lump and preventing clogging, tap water or groundwater is usually used, so that there has been a problem that operation costs such as water bills will increase if it is sufficiently cleaned.
In particular, if a large amount of tap water is used to obtain a cleaning effect, not only will water charges be increased, but not only will the treatment of cleaning wastewater be a major burden, but it will also go against resource saving.
(1) 無機凝集剤注入管を用いて無機凝集剤を直接汚泥供給室内に注入し、凝集剤流出口を介して、外胴ボウルと内胴スクリュウとの間に形成されるプールの分離物排出側へ移行中の固液分離が進んだ凝集汚泥(分離汚泥)に無機凝集剤を速やかに且つ確実に注入することができる。
(2) 効率的に固液分離が進んだ凝集汚泥(分離汚泥)と無機凝集剤とを反応させることができ、分離汚泥からより一層分離液を分離でき、確実に分離物(脱水汚泥や濃縮汚泥)の低含水率化が図れる。
(3) 無機凝集剤を直接分離汚泥に注入できるので、無機凝集剤の凝集効果を低下させることなく即座に注入でき、遠心分離機の高い固液分離性能を安定して維持することができる。
(4) 無機凝集剤を直接分離汚泥に注入するので無駄が省け、また注入量を容易に調整できるため、無機凝集剤使用量を節減することができる。これにより運転コストの低減が図れ、また複雑な運転管理を回避できる。
(5) 無機凝集剤をプールの分離物排出側の分離汚泥へ適正注入するため、凝集汚泥の過度なpH低下を防止でき、遠心分離機等の腐食や劣化を抑制でき、また中和設備を設ける必要がなくなり、設備コスト、運転コスト、維持管理や修繕のコスト等を低減できる。さらに、過剰に薬品類が注入されないため、脱水汚泥を有効利用(堆肥化や燃料化)することができる。
(6) 汚泥に予め高分子凝集剤を供給した場合、生成した凝集汚泥に無機凝集剤を適正に調整して注入できるため、汚泥への無機凝集剤注入に伴うpHの低下やカチオン度の上昇を抑制でき、無機凝集剤の注入量の多少にかかわらず、選定された最適な高分子凝集剤を使用し続けることができ、また高分子凝集剤の選定自体も容易になる。
(7) 無機凝集剤をプールの分離物排出側の分離汚泥へ適正注入することにより、脱水汚泥をより一層低含水率化させて減容化できるため、取扱いが容易であると共に、処理処分に要する作業や費用を軽減することができる。 According to the centrifugal separator of the present invention, the inorganic flocculant injection pipe for injecting the inorganic flocculant into the sludge supply chamber disposed in the inner cylinder screw of the centrifuge and the water supply pipe connected to the inorganic flocculant injection pipe are provided. By providing, there are many excellent effects as follows.
(1) The inorganic flocculant is injected directly into the sludge supply chamber using the inorganic flocculant injection pipe, and the pool separation formed between the outer shell bowl and the inner shell screw is discharged through the flocculant outlet. The inorganic flocculant can be quickly and reliably injected into the agglomerated sludge (separated sludge) that has undergone solid-liquid separation during the transition to the side.
(2) Agglomerated sludge (separated sludge) that has been efficiently separated into solid and liquid can be reacted with the inorganic flocculant, and the separated liquid can be further separated from the separated sludge. The water content of sludge can be reduced.
(3) Since the inorganic flocculant can be directly injected into the separated sludge, it can be injected immediately without reducing the flocculating effect of the inorganic flocculant, and the high solid-liquid separation performance of the centrifuge can be stably maintained.
(4) Since the inorganic flocculant is directly injected into the separated sludge, waste can be saved and the amount of the inorganic flocculant can be easily adjusted, so that the amount of inorganic flocculant used can be reduced. As a result, the operation cost can be reduced and complicated operation management can be avoided.
(5) Since the inorganic flocculant is appropriately injected into the separated sludge on the separated product discharge side of the pool, it is possible to prevent excessive pH drop of the coagulated sludge, suppress corrosion and deterioration of the centrifuge, etc. This eliminates the need to provide facilities, reduces operating costs, maintenance and repair costs, and the like. Furthermore, since chemicals are not injected excessively, dewatered sludge can be effectively used (composted or fueled).
(6) When polymer flocculant is supplied to sludge beforehand, inorganic flocculant can be appropriately adjusted and injected into the generated flocculent sludge, so the pH and cation degree increase accompanying the injection of inorganic flocculant into sludge Regardless of the amount of the inorganic flocculant injected, the selected optimum polymer flocculant can be used continuously, and the selection of the polymer flocculant itself becomes easy.
(7) By properly injecting the inorganic flocculant into the separated sludge on the separated product discharge side of the pool, the dehydrated sludge can be further reduced in volume by reducing the water content, so that it is easy to handle and can be used for disposal. The work and cost required can be reduced.
(1) プールの分離物排出側へ移行中の固液分離が進んだ凝集汚泥(分離汚泥)に、希釈され増量した無機凝集剤溶液を直接注入するため、無機凝集剤溶液が分散して分離汚泥に速やかに且つ広範囲に注入され、これにより分離汚泥の固液分離が進み、脱水濃縮工程の終盤での操作(無機凝集剤注入)であるにもかかわらず、分離汚泥から効率的に且つ確実に分離液が分離して、より低い含水率の脱水汚泥を得ることができ、加えて無機凝集剤を効率的に注入できるので使用量を低減することもできる。
(2) 無機凝集剤を予め希釈して増量させてあるため、無機凝集剤溶液を速やかに安定して凝集剤吐出孔から汚泥供給室に吐出させ、凝集剤流出口を介して分離汚泥へスムーズに注入することができる。また、分離汚泥に無機凝集剤溶液を満遍なく直接注入でき、短時間で速やかに分離汚泥と無機凝集剤とを反応させることができ、より一層効率的に且つ確実に脱水汚泥の含水率を低下させることができる。
(3) 無機凝集剤を無機凝集剤注入管内で速やかに且つ確実に希釈することができるため、高濃度の無機凝集剤原液を用いることができ、これにより無機凝集剤貯留槽(無機凝集剤希釈タンク)や無機凝集剤注入ポンプの小型化が可能であり、設備コストや設置面積の削減に有効である。
(4) 無機凝集剤注入管と給水管とを接続することにより、無機凝集剤注入管内で無機凝集剤溶液を容易に希釈(ライン混合)することができる。そのため、希釈の度合い(希釈倍率)を、運転状態等に合わせて速やかに且つ任意に変更することができ、より効率的な運転が可能となる。 In the present invention, by supplying water to the inorganic flocculant injection tube while the centrifuge is in operation, the inorganic flocculant can be diluted efficiently and reliably in the inorganic flocculant injection tube. Can be injected. Therefore, the following operational effects are achieved.
(1) The inorganic flocculant solution is dispersed and separated because the diluted and increased amount of the inorganic flocculant solution is directly injected into the agglomerated sludge (separated sludge) that has undergone solid-liquid separation during the transition to the separated product discharge side of the pool. The sludge is quickly and widely injected into the sludge, which allows the solid-liquid separation of the separated sludge to proceed efficiently and reliably from the separated sludge despite the operation (inorganic flocculant injection) at the end of the dehydration concentration process. In addition, the separated liquid can be separated to obtain a dehydrated sludge having a lower water content, and in addition, since the inorganic flocculant can be efficiently injected, the amount used can be reduced.
(2) Since the inorganic flocculant is diluted and increased in advance, the inorganic flocculant solution is quickly and stably discharged from the flocculant discharge hole to the sludge supply chamber and smoothly separated into the sludge through the flocculant outlet. Can be injected into. In addition, the inorganic flocculant solution can be evenly injected directly into the separated sludge, allowing the separated sludge and the inorganic flocculant to react quickly in a short time, further reducing the moisture content of the dewatered sludge more efficiently and reliably. be able to.
(3) Since the inorganic flocculant can be diluted quickly and reliably in the inorganic flocculant injection tube, a high concentration of the inorganic flocculant stock solution can be used. Tank) and inorganic flocculant injection pump can be reduced in size, which is effective in reducing equipment costs and installation area.
(4) By connecting the inorganic flocculant injection pipe and the water supply pipe, the inorganic flocculant solution can be easily diluted (line mixed) in the inorganic flocculant injection pipe. Therefore, the degree of dilution (dilution ratio) can be changed quickly and arbitrarily in accordance with the operating state and the like, and more efficient operation is possible.
汚泥に予め無機凝集剤を供給(前段供給)し、凝集フロック(凝集汚泥)を形成させておくことにより、汚泥供給室内への無機凝集剤注入(後段注入)との相乗効果により、凝集性能や固液分離性能がより向上し、分離物(脱水汚泥)の低含水率化はもちろんのこと、処理量の増加やSS回収率の向上が図れる。 In the present invention, when the inorganic flocculant is supplied to the sludge in advance through the inorganic flocculant supply pipe (pre-stage supply), it is possible to generate strong flocculated flocs (aggregated sludge) that are easily solid-liquid separated. High solid-liquid separation performance can be demonstrated at the initial stage, and the processing amount can be maintained appropriately.
By supplying the inorganic flocculant to the sludge in advance (pre-stage supply) and forming the floc floc (aggregated sludge), the coagulation performance and The solid-liquid separation performance is further improved, and not only the water content of the separated product (dehydrated sludge) is lowered, but also the processing amount and the SS recovery rate can be improved.
分離液からのリン除去のため、汚泥に過剰に無機凝集剤を供給すると薬品代など運転コストの上昇を招くが、分離液のリン濃度に応じて適宜無機凝集剤供給ポンプや無機凝集剤注入ポンプの流量を調整できるので、運転コストの上昇を抑えて、確実にリン除去ができると共に安定した固液分離性能を発揮できる。 According to the present invention, when the phosphorus concentration of the separation liquid is high (the amount of phosphorus contained in the sludge), the inorganic flocculant supply amount (pre-stage supply amount) by the inorganic flocculant supply pump is mainly adjusted to increase. On the other hand, when it is low (small), it can be adjusted so as to reduce the supply amount of the inorganic flocculant, and phosphorus removal from the separation liquid can be performed stably.
Excessive supply of inorganic flocculant to sludge to remove phosphorus from the separation liquid will lead to an increase in operating costs such as chemical costs, but depending on the phosphorus concentration of the separation liquid, inorganic flocculant supply pump and inorganic flocculant injection pump Therefore, it is possible to suppress the increase in operation cost, to surely remove phosphorus and to exhibit stable solid-liquid separation performance.
無機凝集剤の注入・供給については、無機凝集剤注入ポンプと無機凝集剤供給ポンプとを別途設けて、運転状況や処理状況により、両ポンプをそれぞれ運転させることが好ましいが、一台のポンプをバルブ操作により兼用してもよい。これにより、設備費やランニングコストを削減できると共に、省スペース化にも役立つ。 According to the present invention, by providing a controller for controlling the operation of the inorganic flocculant supply pump and the inorganic flocculant injection pump based on the measurement value of the phosphorus concentration measuring device, the sludge can be quickly and reliably supplied to the sludge according to the situation. The supply amount and injection amount of the inorganic flocculant can be controlled, and stable solid-liquid separation performance can be obtained, and the operation cost can be reduced, the labor can be saved, and the work can be reduced.
For the injection and supply of the inorganic flocculant, it is preferable to provide an inorganic flocculant injection pump and an inorganic flocculant supply pump separately, and to operate both pumps depending on the operating conditions and processing conditions. You may also use by valve operation. As a result, the equipment cost and running cost can be reduced, and the space can be saved.
すなわち、洗浄工程(遠心分離機停止中)において、給水管に分離液を循環させて利用することにより、水道使用量の節約が可能となり、水道使用料等を削減でき省資源化に有効である。また、循環ポンプの運転により、給水管による給水量を増大させることができ、遠心分離機内への通水量(通水速度)や水圧が上昇するため、洗浄効率を向上させ、洗浄効果を高めることができる。 In the present invention, when a circulation pipe for circulating the separation liquid is provided and connected to a water supply pipe, the separation liquid can be (re) used for water supply.
In other words, in the cleaning process (when the centrifuge is stopped), the separation liquid is circulated and used in the water supply pipe, so that it is possible to save water usage and reduce water usage fees, which is effective for resource saving. . In addition, the amount of water supplied through the water supply pipe can be increased by operating the circulation pump, and the water flow rate (water flow rate) and water pressure into the centrifuge increase, thereby improving the cleaning efficiency and enhancing the cleaning effect. Can do.
高分子凝集剤としては、両性高分子凝集剤、カチオン系高分子凝集剤、アニオン系高分子凝集剤、ノニオン系高分子凝集剤を用いる。
本発明によれば、汚泥に無機凝集剤、例えばポリ鉄を供給して微細な凝集フロックを生成させた後、両性高分子凝集剤を供給することにより、更に凝集させて大きく強固な汚泥フロックを生成させることができる。
単独で比較的強固な汚泥フロックを生成できるカチオン系高分子凝集剤、アニオン系高分子凝集剤、ノニオン系高分子凝集剤を用いてもよく、例えば汚泥に予め無機凝集剤を少なく供給した場合にはカチオン系高分子凝集剤を、多く供給した場合にはアニオン系高分子凝集剤を使用することにより、強固な汚泥フロックを生成させることができる。またノニオン系高分子凝集剤は上水汚泥等を脱水処理する場合に有効である。 In the present invention, when sludge is dehydrated using a centrifuge, it is usually desirable to use a polymer flocculant in addition to the inorganic flocculant. Combined use of a polymer flocculant can reliably agglomerate the solid components of sludge and create a stronger flocculated floc (aggregated sludge) with higher separability and efficient solid-liquid separation (centrifugal dehydration). Can do.
As the polymer flocculant, amphoteric polymer flocculants, cationic polymer flocculants, anionic polymer flocculants, and nonionic polymer flocculants are used.
According to the present invention, after supplying an inorganic flocculant such as polyiron to sludge to form fine flocculent flocs, the amphoteric polymer flocculant is further fed to further agglomerate and form a large and strong sludge floc. Can be generated.
Cationic polymer flocculants, anionic polymer flocculants, and nonionic polymer flocculants that can generate relatively strong sludge flocs alone may be used.For example, when a small amount of inorganic flocculant is supplied to sludge in advance. Can produce a strong sludge floc by using an anionic polymer flocculant when a large amount of the cationic polymer flocculant is supplied. Nonionic polymer flocculants are effective when dewatering water sludge and the like.
図1は本発明の実施の形態1による遠心分離装置を示す断面図である。
本発明に係る遠心分離装置は、外胴ボウル3と内胴スクリュウ4を備えた遠心分離機1と、無機凝集剤吐出孔23aを有し、前記内胴スクリュウ4に配設された汚泥供給室7内へ無機凝集剤を注入する無機凝集剤注入管23と、該無機凝集剤注入管23に接続して給水する給水管26とを備えた基本構造となっている。
FIG. 1 is a cross-sectional view showing a centrifugal separator according to
The centrifugal separator according to the present invention includes a
しかしながら、このような洗浄は、装置内に残存する汚泥の排除(汚泥の清掃)が主目的であり、凝集剤注入系統の洗浄(とくに付着固化しやすい無機凝集剤の洗い流し)がなかなか行えない。とくに、本発明にかかる遠心分離装置の場合、無機凝集剤注入管23の無機凝集剤吐出孔23aや内胴テーパ4bに設けられた凝集剤流出口7bは、汚泥供給室7内に設けられた仕切板8により仕切られていることもあり、通常の洗浄では汚泥の清掃や無機凝集剤の洗い流しを十分に行えない。そこで、安定した遠心分離処理および機器の保守管理のために、無機凝集剤注入管23に給水管26を接続して給水し、凝集剤注入系統(主に無機凝集剤注入管、無機凝集剤吐出孔、凝集剤流出口)等を確実に且つ十分に洗浄することができる。 First, in the cleaning of the
However, the main purpose of such cleaning is to remove sludge remaining in the apparatus (sludge cleaning), and it is difficult to clean the flocculant injection system (especially washing away the inorganic flocculant that tends to adhere and solidify). In particular, in the case of the centrifugal separator according to the present invention, the inorganic
遠心分離機1の運転状態においては、汚泥貯留槽11の汚泥が汚泥供給ポンプ15により汚泥供給管14を介して遠心分離機1の汚泥供給室7に供給される。その汚泥供給時には、無機凝集剤貯留槽13の無機凝集剤が無機凝集剤注入ポンプ24により無機凝集剤注入管23の無機凝集剤吐出孔23aから汚泥供給室7の小径側(内胴スクリュウ4の内胴テーパ4b付近)に注入(以下、「後段注入」という)される。後段注入された無機凝集剤溶液は、内胴スクリュウ4の凝集剤流出口7bからプール10へ流れ出し、スクリュウ羽根4cにより分離物排出側(遠心分離機1の分離物排出口2b側)へ移動しながら外胴ボウル3小径側の緩傾斜領域となる2段テーパ3c付近でプール10の水面WL上に掻き上げられた分離汚泥(遠心効果により固液分離が進んだ凝集汚泥)に注入される。そして速やかに分離汚泥と無機凝集剤溶液とが混合・反応して、効率よく安定して分離汚泥の固液分離(分離液の分離・低含水率化)が促進され、従来に比べ2~10%程度低い含水率の脱水汚泥を得ることができる。 Next, the operation will be described.
In the operation state of the
また、遠心分離機1の運転中に前記給水を常時行う(無機凝集剤を希釈して低濃度化する)ことで、無機凝集剤の付着固化を抑制でき、目詰りによる閉塞の防止や装置の長寿命化に貢献できる。 At this time, the inorganic flocculant solution flowing in the inorganic
In addition, the water supply is always performed during the operation of the centrifuge 1 (diluting the inorganic flocculant to reduce the concentration), so that the adhesion and solidification of the inorganic flocculant can be suppressed. Contributes to longer life.
図2(A)は本発明の実施の形態2による遠心分離装置を示す断面図、図2(B)は図2(A)の要部拡大断面図であり、図1と同一構成要素には同一符号を付して重複説明を省略する。
この実施の形態2による遠心分離装置は、無機凝集剤と共に高分子凝集剤を併用して遠心分離機1内に供給する構造とした点、複数の無機凝集剤吐出孔23a,23b,23cとそれらに対応する複数の仕切板8a,8b,8cおよび凝集剤流出口7b,7c,7dを設けた点、給水管26における自動開閉弁27の下流側に給水ポンプ28を配設した点が、前記実施の形態1と大きく異なる。
2A is a cross-sectional view showing a centrifugal separator according to
The centrifugal separator according to the second embodiment has a structure in which a polymer flocculant is used together with an inorganic flocculant and is supplied into the
遠心分離機1の運転中は、汚泥供給管14から汚泥供給室7に汚泥が供給されると共に、該汚泥供給室7には高分子凝集剤供給管16から高分子凝集剤溶液が供給される。これにより、汚泥供給室7内で高分子凝集剤溶液が混合された汚泥(凝集汚泥)は、汚泥供給口7aからプール10に供給され、強い遠心力を受けて固液分離が進む。その後、給水管26からの給水により無機凝集剤注入管23内で希釈されて増量した希釈無機凝集剤溶液(希釈溶液)が、無機凝集剤注入管23の無機凝集剤吐出孔23a,23b,23cから注入(後段注入)され、注入された希釈溶液は、内胴スクリュウ4の凝集剤流出口7b,7c,7dからプール10へ流出し、主にスクリュウ羽根4cにより分離物排出側に移動しながら水面WL上に掻き上げられた分離汚泥(遠心効果で固液分離が進んだ凝集汚泥)に注入される。これにより、効率よく安定して分離汚泥の固液分離(分離液の分離・低含水率化)が促進される。 Next, the operation will be described. FIG. 3 is a schematic explanatory view of the operation in the
During operation of the
図4に示す配管構造例は、遠心分離装置に必須である汚泥供給管14の内部に高分子凝集剤供給管16と無機凝集剤注入管23の2つのパイプを延伸配設したものである。これにより、内胴スクリュウ4の軸受やシール等の構造を簡素化することを可能としたものである。 4A is a cross-sectional view showing an example of the piping structure of the
In the example of the piping structure shown in FIG. 4, two pipes of a polymer
図5に示す配管構造例は、汚泥供給管14の内部に仕切りを入れた形で断面半円形状に形成された高分子凝集剤供給管16(上部)と無機凝集剤注入管23(下部)を円形状(ドーナツ状)に組合せ配管したもの(いわゆる2重管構造)である。これにより、汚泥供給管14内部に異物が存在しないため、管内が洗浄しやすく閉塞等の問題も回避できる。 FIG. 5 shows a modification of FIG. 4, and FIG. 5 (A) is a sectional view showing an example of the piping structure of the
In the example of the piping structure shown in FIG. 5, the polymer flocculant supply pipe 16 (upper part) and the inorganic flocculant injection pipe 23 (lower part) formed in a semicircular cross section with a partition placed inside the
そこで、本発明では、無機凝集剤溶液(希釈溶液)が後段注入される外胴ボウル3の2段テーパ3b,3cを、急傾斜の2段テーパ3bと緩傾斜の2段テーパ3cとの2段テーパとしたことにより、遠心分離機1の機長を抑えつつ分離汚泥の水切り部分を長くできると共に、この部分において無機凝集剤溶液を速やかに且つ広範に注入することで、無機凝集剤と分離物の接触時間をより長く確保できるため、分離物(脱水汚泥)の低含水率化に大変有効である。もちろん、外胴ボウル3のテーパ部は1段テーパ3dであっても高い遠心分離(脱水)性能を得ることができる。 As described above, when the inorganic flocculant solution is injected later, it is necessary to efficiently contact and mix the inorganic flocculant solution with the separated sludge and drain the separated sludge after the mixing (solid-liquid separation).
Therefore, in the present invention, the two-
上記実施の形態2による遠心分離装置の運転例を以下に示す。実施条件は、下水混合生汚泥を対象に高効率型遠心脱水機を使用し、機械の運転条件を処理量1.5m3/h、遠心効果2000G、高分子凝集剤注入(供給)率0.6%、差速1.0~3.0回転のほぼ同一の条件で従来の装置と本発明にかかる遠心分離装置との比較を行った。混合生汚泥の濃度は3.1%、pHは5.5である。実施例の結果を表1に示す。 Example 1.
An example of operation of the centrifugal separator according to the second embodiment is shown below. The implementation conditions are a high-efficiency centrifugal dehydrator for sewage mixed raw sludge, the operating conditions of the machine are processing volume 1.5m 3 / h, centrifugal effect 2000G, polymer flocculant injection (supply) rate 0.6%, A comparison was made between the conventional apparatus and the centrifugal separator according to the present invention under substantially the same conditions of a differential speed of 1.0 to 3.0 revolutions. The concentration of mixed raw sludge is 3.1% and the pH is 5.5. The results of the examples are shown in Table 1.
図6は本発明の実施の形態3による遠心分離装置を示す断面図であり、図2と同一の構成要素には同一符号を付して重複説明する。
この実施の形態3の遠心分離装置は、主に遠心分離機1内部を洗浄する洗浄水を供給する洗浄本管40を汚泥供給管14に開閉弁41を介して接続すると共に、前記洗浄本管40から開閉弁42を介して分岐させた給水管としての給水分岐管26cを無機凝集剤注入管23に接続した点が、前記実施の形態2と大きく異なる。また、この実施の形態3の遠心分離装置では、外胴ボウル3のテーパ部を1段テーパ3dとした点も前記実施の形態2と異なるが、外胴ボウル3のテーパ部としては、処理対象の汚泥や処理量などにより、1段テーパ3dと図1や図2に示した2段テーパ3b,3cを適宜選択して採用すればよい。
FIG. 6 is a sectional view showing a centrifugal separator according to
In the centrifuge of the third embodiment, a cleaning
図7は本発明の実施の形態4による遠心分離装置を示す断面図であり、図2と同一の構成要素には同一符号を付して重複説明を省略する。
この実施の形態4の遠心分離装置では、無機凝集剤注入管23に、無機凝集剤注入ポンプ24の上流側において給水管26を接続した点が前記実施の形態2と異なる。なお、無機凝集剤注入管23は、無機凝集剤注入ポンプ24の上流側が開閉弁43を介して無機凝集剤貯留槽13に接続され、また給水管26は開閉弁44を介して無機凝集剤注入管23の前記無機凝集剤注入ポンプ24と前記開閉弁43との間に接続されている。
FIG. 7 is a cross-sectional view showing a centrifugal separator according to
The centrifugal separator according to the fourth embodiment is different from the second embodiment in that a
なお、給水管26による給水は、実施の形態2と同様に独立した給水設備を設けてもよいし、また実施の形態3と同様に遠心分離機1の洗浄を兼ねた給水設備としてもよい。 As described above, in the fourth embodiment, by connecting the
In addition, the water supply by the
汚泥に予め無機凝集剤が供給されていない場合、また汚泥と注入した無機凝集剤とが十分に反応できない場合、分離液の清澄性(SS回収率)が悪くなったり、汚泥に含まれるリンが除去されず分離液へ移行してリン濃度が高くなったりするなど、分離液の水質が悪化することがあるため、この実施の形態5では、汚泥に予め無機凝集剤を供給(前段供給)しておく構造としたものである。
When the inorganic flocculant is not supplied to the sludge in advance, or when the sludge and the injected inorganic flocculant cannot sufficiently react, the clarification (SS recovery rate) of the separated liquid is deteriorated, or phosphorus contained in the sludge In this
この実施の形態5の遠心分離装置では、無機凝集剤の前段供給手段として無機凝集剤貯留槽13から伸びる無機凝集剤供給管20を汚泥供給管14の上流側(汚泥供給ポンプ15と高分子凝集剤供給管16接続部との間)で接続し、この無機凝集剤供給管20に無機凝集剤供給ポンプ21と流量計22を配設すると共に、無機凝集剤の後段注入手段として無機凝集剤供給ポンプ21の上流側(無機凝集剤貯留槽13と無機凝集剤供給ポンプ21との間)で無機凝集剤注入管23を分岐させ、その無機凝集剤注入管23にも無機凝集剤注入ポンプ24および流量計25を配設したものである。なお、その他の構造は前記実施の形態1(図1)と同様である。 FIG. 8 is a cross-sectional view showing a centrifugal separator according to
In the centrifugal separator according to the fifth embodiment, the inorganic
図9は本発明の実施の形態6による遠心分離装置を示す断面図であり、図8と同一の構成要素には同一符号を付して重複説明を省略する。
この実施の形態6の遠心分離装置は、2種類の無機凝集剤(無機凝集剤A、無機凝集剤B)を併用する構造としたものである。そのため、前記無機凝集剤貯留槽13とは別に前段無機凝集剤貯留槽13Aを備え、この前段無機凝集剤貯留槽13Aから伸びる無機凝集剤供給管20を汚泥供給管14に接続し、汚泥供給管14内の汚泥に無機凝集剤A溶液を前段供給できるようにしたものである。
FIG. 9 is a cross-sectional view showing a centrifugal separator according to
The centrifugal separator according to the sixth embodiment has a structure in which two types of inorganic flocculants (inorganic flocculant A and inorganic flocculant B) are used in combination. Therefore, a separate
図10は本発明の実施の形態7による遠心分離装置を示す断面図、図11は図10の要部を拡大して示す断面図である。
この実施の形態7の遠心分離装置は、高分子凝集剤溶液を汚泥供給室7内に供給するため、汚泥供給室7内で開口する高分子凝集剤吐出口16bが設けられた高分子凝集剤供給管16を汚泥供給管14内に延伸させた構造にすると共に、汚泥への無機凝集剤の前段供給も、高分子凝集剤と同様に汚泥供給室7内で行うように、汚泥供給室7内で開口する無機凝集剤供給管開口20a(図11参照)が設けられた無機凝集剤供給管20を汚泥供給管14内に延伸させた構造としたものである。また、無機凝集剤は1種類を前段供給と後段注入とで併用し、給水管26は分岐管26aと26bとに分岐させて無機凝集剤供給管20および無機凝集剤注入管23へ給水(洗浄および希釈)できるように構成してある。
10 is a cross-sectional view showing a centrifugal separator according to
The centrifugal separator according to the seventh embodiment has a polymer flocculant provided with a polymer
図12は本発明の実施の形態8による遠心分離装置を示す断面図である。図10および図11と同一の構成要素には同一符号を付して重複説明を省略する。
図10および図11に示した実施の形態7では、無機凝集剤供給管20を汚泥供給室7に延伸させて無機凝集剤の前段供給を汚泥供給室7内で行う構成としたが、この実施の形態8では、汚泥と前段供給する無機凝集剤とを十分に反応させるため、無機凝集剤供給管20を汚泥供給管14に接続し、汚泥供給管14の汚泥に無機凝集剤を前段供給(ライン供給)する構成とした。このように構成することにより、汚泥と前段供給した無機凝集剤とが十分に混合され、確実に凝集フロックを生成することができると共に、汚泥に含まれるリンを不溶性塩にして分離液のリン濃度を低減することもできる。なお、無機凝集剤供給管20の汚泥供給管14への接続位置は、汚泥貯留槽11から遠心分離機1までの間のいずれの場所でもかまわない。
FIG. 12 is a sectional view showing a centrifugal separator according to
In the seventh embodiment shown in FIGS. 10 and 11, the inorganic
図13は本発明の実施の形態9による遠心分離装置を示す断面図、図14は図13の要部を拡大して示す断面図であり、図10~図12と同一の構成要素には同一符号を付して重複説明を省略する。
この実施の形態9では、前記実施の形態7(図10)の遠心分離装置における汚泥供給室7の直胴部4aに設けられた分離液排出側の仕切板8dおよびこの仕切板8dの近傍に供給された高分子凝集剤が流出する分離液排出側の凝集剤流出口7eを省き、また汚泥供給管開口20aと汚泥供給口7aとの間隔を広げた構造となっているものである。また給水管26は、図8と同様に分岐せず無機凝集剤注入管23に接続している。
このような構成とすることにより、図10に示した前記実施の形態7と同様の作用効果を得ながら、汚泥供給室7内の構造を簡略化することができ、また装置の製造を容易にし、さらに維持管理や保守点検の作業を軽減化できる。 Embodiment 9 FIG.
FIG. 13 is a cross-sectional view showing a centrifugal separator according to Embodiment 9 of the present invention, and FIG. 14 is an enlarged cross-sectional view showing the main part of FIG. 13, and the same components as in FIGS. A reference numeral is attached and a duplicate description is omitted.
In the ninth embodiment, the separation liquid discharge
By adopting such a configuration, the structure in the
図15は本発明の実施の形態10による遠心分離装置を示す断面図である。図13および図14と同一の構成要素には同一符号を付して重複説明を省略する。
図13および図14に示した実施の形態9では、無機凝集剤供給管20を汚泥供給室7に延伸させて無機凝集剤の前段供給を汚泥供給室7内で行う構成としたが、この実施の形態10では、汚泥と前段供給する無機凝集剤とを十分に反応させるため、無機凝集剤供給管20を汚泥供給管14に接続し、汚泥供給管14の汚泥に無機凝集剤を前段供給(ライン供給)する構成とした。このように構成することにより、汚泥と前段供給した無機凝集剤とが十分に混合され、確実に凝集フロックを生成することができると共に、汚泥に含まれるリンを不溶性塩にして分離液のリン濃度を低減することもできる。なお、無機凝集剤供給管20の汚泥供給管14への接続位置は、汚泥貯留槽11から遠心分離機1までの間のいずれの場所でもかまわない。このような構成とすることにより、前記実施の形態8と同様の作用効果を得ながら、汚泥供給室7内の構造を簡略化することができ、また装置の製造を容易にし、さらに維持管理や保守点検の作業を軽減化できる。
FIG. 15 is a sectional view showing a centrifugal separator according to the tenth embodiment of the present invention. The same components as those in FIG. 13 and FIG.
In the ninth embodiment shown in FIG. 13 and FIG. 14, the inorganic
上記実施の形態5~10(図8~図15)などによる遠心分離装置の運転例を以下に示す。
実施条件は、下水消化汚泥を対象に高効率型遠心脱水機を使用し、脱水機の運転条件は処理量1.5m3/h、遠心効果2500G、両性高分子凝集剤注入率1.2%、差速1.3~1.5回転のほぼ同一の条件とし、従来の装置と本発明にかかる遠心分離装置との比較を行った。
なお、処理対象の下水消化汚泥は、濃度が1.5%、リン濃度が600mg/L程度、pHが7.4である。実施例を表2に示す。 Example 2
An example of the operation of the centrifugal separator according to
The implementation conditions are high-efficiency centrifugal dehydrators for sewage digested sludge. The operating conditions of the dehydrators are 1.5 m 3 / h throughput, centrifugal effect 2500 G, amphoteric polymer flocculant injection rate 1.2%, differential speed A comparison was made between the conventional apparatus and the centrifugal separator according to the present invention under substantially the same conditions of 1.3 to 1.5 revolutions.
The sewage digested sludge to be treated has a concentration of 1.5%, a phosphorus concentration of about 600 mg / L, and a pH of 7.4. Examples are shown in Table 2.
図16は本発明の実施の形態11による遠心分離装置を示す断面図であり、図9と同一または相当部分の構成要素には同一符号を付して重複説明する省略する。
この実施の形態11の遠心分離装置は、リン除去状況を把握するために分離液のリン濃度を測定するリン濃度測定器31を設け、このリン濃度測定器31で測定されたリン濃度に基づき、前段供給用の無機凝集剤供給ポンプ21と後段注入用の無機凝集剤注入ポンプ24の運転を制御(流量調整)する制御器30を設けたものである。また、図9に示した実施の形態6の場合と同様に、2種類の無機凝集剤を併用する構造とし、前記無機凝集剤貯留槽13とは別に無機凝集剤溶液を貯留する前段無機凝集剤貯留槽13Aを設け、これに接続した無機凝集剤供給管20によって前段供給用の無機凝集剤を汚泥貯留槽11に供給するようにした。
FIG. 16 is a cross-sectional view showing a centrifugal separator according to
The centrifuge of the eleventh embodiment is provided with a phosphorus
図18に示すように、ポリ鉄注入率を増加させると分離液のリン濃度は低下すると共に、pHも低下する。この相関関係を定期的に確認しておき、分離液のpH値から分離液のリン濃度を推測し無機凝集剤供給ポンプ21等を制御してもよい。 Moreover, although it is an indirect control regarding supply / injection control of an inorganic flocculant, it is also possible to use a pH meter. In the example using the digested sludge shown in Table 2, the relationship between the phosphorus concentration of the separation liquid and the separation liquid pH with respect to the supply rate (polyiron injection rate) of the inorganic flocculant in the previous stage is shown in FIG.
As shown in FIG. 18, when the polyiron injection rate is increased, the phosphorus concentration of the separation liquid is lowered and the pH is also lowered. This correlation may be confirmed periodically, and the phosphorus concentration of the separation liquid may be estimated from the pH value of the separation liquid to control the inorganic
図17は本発明の実施の形態12による遠心分離装置を示す断面図であり、図8と同一の構成要素には同一符号を付して重複説明を省略する。
この実施の形態12の遠心分離装置は、前段供給の無機凝集剤と後段注入の無機凝集剤を兼用する構成であり、図8で示した無機凝集剤供給ポンプ21と無機凝集剤注入ポンプ24を、1つの無機凝集剤供給ポンプ21(無機凝集剤注入ポンプ24であってもよい)で兼用させると共に、無機凝集剤の供給量や注入量を調整するため、無機凝集剤供給管20に開閉弁32を、無機凝集剤注入管23に開閉弁33を設け、さらにそれらの開閉弁32,33の開閉や開度を制御する手段として、外部因子(例えば分離液のリン濃度、分離液のpHなど)を利用する制御器30Aを設けた構成としたものであり、これにより無機凝集剤の供給・注入を自動化することができる。
FIG. 17 is a cross-sectional view showing a centrifugal separator according to
The centrifuge of the twelfth embodiment is configured to use both the inorganic flocculant supplied in the previous stage and the inorganic flocculant injected in the subsequent stage, and the inorganic
図19は本発明の実施の形態13による遠心分離装置を示す断面図であり、図8と同一の構成要素には同一符号を付して重複説明を省略する。
FIG. 19 is a cross-sectional view showing a centrifugal separator according to a thirteenth embodiment of the present invention. The same components as those in FIG.
このような構成とした実施の形態13では、例えば遠心分離機1の処理量が5m3/hの場合、停止工程での洗浄において、通常洗浄水量は4m3/hで、洗浄時間は10~15分程度かかるが、分離液を循環利用することにより、分離液循環量を3m3/hにすると、遠心分離機1への洗浄水の給水量は合計7m3/hとなり、給水量の増加によって遠心分離機1内等での通水量(通水速度)が上昇し、洗浄効率が向上して5分程度で洗浄することができた。
なお図示しないが、給水管26等には長年の使用によりスケール(カルシウム系)が発生し、無機凝集剤注入管23、無機凝集剤吐出孔23a、23b、23c、凝集剤流出口7b、7c、7d、7e等の閉塞(狭窄)も起こりえるため、酸洗浄設備を設けることが好ましい。 Therefore, in the centrifugal separator according to the thirteenth embodiment, a part of the separation liquid discharged from the
In the thirteenth embodiment having such a configuration, for example, when the throughput of the
Although not shown, scale (calcium-based) is generated in the
これに対して、分離液のpHは、例えば消化汚泥脱水の場合は8程度と高く、分離液を循環利用して無機凝集剤を希釈してもpHはほとんど変動せず、安定して脱水処理が行える。また、通常分離液は2000G以上の高い遠心効果で遠心分離したものであり、水質にも良好(SS低濃度)であるため、分離液を無機凝集剤の希釈に循環利用しても、分離液水質への影響はほとんど無い(微細粒子が多く混入するなど水質が好ましくない希釈水を用いると分離液の水質を悪化させかねない)。 Furthermore, the advantage of using the separated liquid for dilution is that the separated liquid is separated from sludge and has similar properties to sludge, so that the pH of the diluted inorganic flocculant to be injected later is appropriately maintained (acidified). Can be suppressed). Normally, the optimum pH of polyiron and the like is about 5 to 6 at the time of aggregation. For example, when using groundwater (well water), etc., the pH of groundwater is usually low and the pH of polyiron is low. Deviation (lower pH) may occur, and new pH adjustment is required.
On the other hand, the pH of the separated liquid is as high as about 8 in the case of digested sludge dehydration, for example, and even if the inorganic flocculant is diluted by circulating the separated liquid, the pH hardly fluctuates and is stably dehydrated. Can be done. In addition, since the separation liquid is usually centrifuged with a high centrifugal effect of 2000G or higher, and the water quality is also good (SS low concentration), even if the separation liquid is recycled to dilute the inorganic flocculant, the separation liquid There is almost no influence on the water quality (the use of diluted water that does not have a favorable water quality, such as a mixture of many fine particles, may deteriorate the water quality of the separated liquid).
2 ケーシング
2a 分離液排出口
2b 分離物排出口
3 外胴ボウル
3a 直胴部
3b,3c 2段テーパ
3d 1段テーパ
4 内胴スクリュウ
4a 直胴部
4b 内胴テーパ
4c スクリュウ羽根
5,6 回転駆動機
7 汚泥供給室
7a 汚泥供給口
7b,7c,7d,7e 凝集剤流出口
8,8a,8b,8c,8d 仕切板
10 プール
11 汚泥貯留槽
12 高分子凝集剤貯留槽
13 無機凝集剤貯留槽
13A 前段無機凝集剤貯留槽
14 汚泥供給管
14a 汚泥供給管開口
15 汚泥供給ポンプ
16 高分子凝集剤供給管
16a 分岐管
16b 高分子凝集剤吐出口
17 高分子凝集剤供給ポンプ
18 流量計
19 開閉弁
20 無機凝集剤供給管
20a 無機凝集剤供給管開口
21 無機凝集剤供給ポンプ
22 流量計
23 無機凝集剤注入管
23a,23b,23c 無機凝集剤吐出孔
24 無機凝集剤注入ポンプ
25 流量計
26 給水管
26a,26b 分岐管
26c 給水分岐管
27 自動開閉弁
28 給水ポンプ
29 流量計
30,30A 制御器
31 リン濃度測定器
32,33 開閉弁
34 分離液循環配管
35 分離液循環ポンプ
36 開閉弁
37,38 開閉弁
40 本体洗浄管
41~44 開閉弁 DESCRIPTION OF SYMBOLS 1 Centrifugal machine 2 Casing 2a Separation liquid discharge port 2b Separation product discharge port 3 Outer body bowl 3a Straight body part 3b, 3c Two-stage taper 3d First-stage taper 4 Inner body screw 4a Straight body part 4b Inner body taper 4c Screw blade 5 , 6 Rotating drive 7 Sludge supply chamber 7a Sludge supply port 7b, 7c, 7d, 7e Coagulant outlet 8, 8a, 8b, 8c, 8d Partition plate 10 Pool 11 Sludge storage tank 12 Polymer flocculant storage tank 13 Inorganic Flocculant storage tank 13A Pre-stage inorganic flocculant storage tank 14 Sludge supply pipe 14a Sludge supply pipe opening 15 Sludge supply pump 16 Polymer flocculant supply pipe 16a Branch pipe 16b Polymer flocculant discharge port 17 Polymer flocculant supply pump 18 Flow rate Total 19 On-off valve 20 Inorganic flocculant supply pipe 20a Inorganic flocculant supply pipe opening 21 Inorganic flocculant supply pump 22 Flowmeter 23 Inorganic flocculant injection pipes 23a, 23b, 3c Inorganic flocculant discharge hole 24 Inorganic flocculant injection pump 25 Flowmeter 26 Water supply pipe 26a, 26b Branch pipe 26c Water supply branch pipe 27 Automatic open / close valve 28 Water supply pump 29 Flowmeter 30, 30A Controller 31 Phosphorus concentration measuring device 32, 33 On-off valve 34 Separation liquid circulation pipe 35 Separation liquid circulation pump 36 On-off valve 37, 38 On-off valve 40 Main body cleaning pipe 41-44 On-off valve
Claims (5)
- 外胴ボウルおよび内胴スクリュウを備えた遠心分離機で
汚泥を分離物と分離液に分離する遠心分離装置において、
無機凝集剤吐出孔を有し、
前記内胴スクリュウに配設された汚泥供給室内へ
無機凝集剤を注入する無機凝集剤注入管
および
該無機凝集剤注入管に接続して給水する給水管
を備えたことを特徴とする遠心分離装置。 In a centrifuge for separating sludge into a separated product and a separated liquid by a centrifuge equipped with an outer shell bowl and an inner shell screw,
Having inorganic flocculant discharge holes,
A centrifugal separator comprising: an inorganic flocculant injection pipe for injecting an inorganic flocculant into a sludge supply chamber disposed in the inner cylinder screw; and a water supply pipe for supplying water by connecting to the inorganic flocculant injection pipe . - 前記汚泥供給室には、
汚泥供給口、仕切板および凝集剤流出口が設けられている
ことを特徴とする請求項1に記載の遠心分離装置。 In the sludge supply chamber,
The centrifugal separator according to claim 1, wherein a sludge supply port, a partition plate, and a flocculant outlet are provided. - 汚泥に無機凝集剤を供給する無機凝集剤供給管
を備えたことを特徴とする請求項1または請求項2に記載の遠心分離装置。 The centrifugal separator according to claim 1 or 2, further comprising an inorganic flocculant supply pipe for supplying the inorganic flocculant to the sludge. - 前記分離液のリン濃度を測定するリン濃度測定器を備えた
ことを特徴とする請求項1から請求項3のいずれかに記載の遠心分離装置。 The centrifuge according to any one of claims 1 to 3, further comprising a phosphorus concentration measuring device that measures a phosphorus concentration of the separation liquid. - 前記給水管へ前記分離液を供給する分離液循環配管を備えた
ことを特徴とする請求項1から請求項4のいずれかに記載の遠心分離装置。 The centrifuge according to any one of claims 1 to 4, further comprising a separation liquid circulation pipe for supplying the separation liquid to the water supply pipe.
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CN2010800223531A CN102448896B (en) | 2009-05-18 | 2010-05-17 | Centrifugal separation device |
HK12109076.4A HK1168340A1 (en) | 2009-05-18 | 2012-09-14 | Centrifugal separation device |
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JP2009119911A JP5425523B2 (en) | 2009-05-18 | 2009-05-18 | Centrifuge |
JP2009-119911 | 2009-05-18 |
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WO2010134310A1 true WO2010134310A1 (en) | 2010-11-25 |
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PCT/JP2010/003299 WO2010134310A1 (en) | 2009-05-18 | 2010-05-17 | Centrifugal separation device |
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JP (1) | JP5425523B2 (en) |
CN (1) | CN102448896B (en) |
HK (1) | HK1168340A1 (en) |
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JP2012115800A (en) * | 2010-12-03 | 2012-06-21 | Nishihara Environment Co Ltd | Sludge dehydrator and method for dehydrating sludge |
JP2012115816A (en) * | 2010-12-03 | 2012-06-21 | Nishihara Environment Co Ltd | Apparatus and method for treating sludge |
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JP2014233693A (en) * | 2013-06-04 | 2014-12-15 | 水ing株式会社 | Deodorizing method and device of dehydrated cake |
JP2017177054A (en) * | 2016-03-31 | 2017-10-05 | 株式会社北▲りょう▼ | Sludge dewatering method and dewatering apparatus for sludge |
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JP5650999B2 (en) * | 2010-12-03 | 2015-01-07 | 巴工業株式会社 | Centrifuge and sludge dewatering method |
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CN102448896B (en) | 2013-11-20 |
CN102448896A (en) | 2012-05-09 |
JP2010264419A (en) | 2010-11-25 |
JP5425523B2 (en) | 2014-02-26 |
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