WO2004103521A1 - 凝集沈殿装置 - Google Patents
凝集沈殿装置 Download PDFInfo
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- WO2004103521A1 WO2004103521A1 PCT/JP2004/006954 JP2004006954W WO2004103521A1 WO 2004103521 A1 WO2004103521 A1 WO 2004103521A1 JP 2004006954 W JP2004006954 W JP 2004006954W WO 2004103521 A1 WO2004103521 A1 WO 2004103521A1
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- water
- treated
- coagulant
- meter
- treated water
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5209—Regulation methods for flocculation or precipitation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
- B01D21/0042—Baffles or guide plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0087—Settling tanks provided with means for ensuring a special flow pattern, e.g. even inflow or outflow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
- B01D21/04—Settling tanks with single outlets for the separated liquid with moving scrapers
- B01D21/06—Settling tanks with single outlets for the separated liquid with moving scrapers with rotating scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
- B01D21/08—Settling tanks with single outlets for the separated liquid provided with flocculating compartments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/10—Settling tanks with multiple outlets for the separated liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/10—Settling tanks with multiple outlets for the separated liquids
- B01D21/16—Settling tanks with multiple outlets for the separated liquids provided with flocculating compartments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2405—Feed mechanisms for settling tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2427—The feed or discharge opening located at a distant position from the side walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2444—Discharge mechanisms for the classified liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/30—Control equipment
- B01D21/305—Control of chemical properties of a component, e.g. control of pH
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/30—Control equipment
- B01D21/32—Density control of clear liquid or sediment, e.g. optical control ; Control of physical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/30—Control equipment
- B01D21/34—Controlling the feed distribution; Controlling the liquid level ; Control of process parameters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/02—Fluid flow conditions
Definitions
- the present invention relates to sewage treatment, and more particularly to a coagulation sedimentation technique in which a coagulant is added to water to be treated, that is, sewage, to coagulate and precipitate suspended substances in the sewage.
- Patent Document 1 Japanese Patent Publication No. 42-25986
- Non-Patent Document 1 Water Treatment Engineering (Second Edition), edited by Tetsuo Ide (1995), P59-P67
- Non-Patent Document 2 Water Treatment Management Handbook (Maruzen Co., Ltd., 1998), P124-130 Non-Patent Document 3: 39th Annual Sewerage Workshop Presentation (2002), Session No. 2-6-2,
- a sewer system has a split flow system and a merged system.
- sewage combined with sewage and rainwater discharged from homes or the like is treated.
- the primary treatment mainly removing suspended solids
- secondary treatment mainly biological
- secondary treatment that cannot increase the processing speed is omitted, and only the primary treatment is discharged to general rivers, etc., and measures are taken to reduce the amount of untreated discharge. . Therefore, in order to reduce the untreated discharge as much as possible, it is desired to speed up the simple processing (the processing of releasing only the temporary processing).
- the apparatus for simple processing includes a first stirring tank 10 for adding and stirring an inorganic coagulant to sewage S, and a second stirring tank 12 for adding and stirring an organic polymer coagulant.
- the floc formed by flocculating the flocculant by stirring and mixing the flocculent is flocculated and separated from the sewage, and the floc is flocculated; discharged as sludge F and the solid substance is separated.
- It has a solid-liquid separation tank 16 for discharging water W, and in order to carry out simple processing efficiently and at high speed in this device, it is necessary to supply an appropriate amount of flocculant and appropriately mix the flocculant with sewage. In addition, efficient coagulation and sedimentation of the suspended substance is required. Disclosure of the invention
- the present invention provides:
- a dividing member that is set in the separation tank body and divides the inside of the separation tank body into an upper chamber and a lower chamber;
- the upper chamber is provided with a first treated water discharge port for discharging treated water to the outside at an upper part thereof,
- the lower chamber has a second treated water discharge port for discharging treated water to the outside at a position above the lower opening of the treated water flow passage, and a lower opening than the lower opening of the treated water flow passage. In the lower position, there is a block outlet for discharging the block separated from the water to be treated,
- the upward flow velocity of the water to be treated toward the first treated water discharge port in the upper chamber, and the upward flow velocity of the treated water toward the second treated water discharge port in the lower chamber, Have flocculation sedimentation tanks so that the floc in the upward flow can reach a speed at which it can descend.
- a coagulation settling device is provided.
- / 2nd treated water discharge locus By adjusting the discharge amount of treated water discharged, the upward flow of treated water toward the first treated water discharge port in the upper chamber And the upward flow velocity of the water to be treated toward the second treated water discharge port in the lower chamber is set to a velocity at which the flocs in the upward flow can descend. It can be so By doing so, the treatment speed of the water to be treated as the whole coagulation and sedimentation apparatus can be made higher than the sedimentation speed of the floc, and the treatment of the water to be treated can be performed at a high speed.
- the separation tank main body has a bottom wall portion and a peripheral wall portion extending upward from the bottom wall portion, and the dividing member is spaced from the inner surface of the peripheral wall portion of the separation tank main body.
- a funnel-shaped member, wherein the water flow passage to be treated is set at a position below the dividing member and is inclined downward from the inner surface of the peripheral wall of the separation tank body toward the center of the separation tank body; It can be formed between the dividing member.
- the dividing member is formed in a bowl shape that is recessed downward toward a central portion, and the treated water introduction pipe directs treated water toward the central portion of the dividing member. Can be discharged downward.
- a floating filter medium, a filter medium outflow prevention screen above the floating filter medium, and a filter medium receiving screen below the floating filter medium are provided in an upper portion of the first chamber, and the first treated water drainage is provided.
- the force S can be such that the outlet is provided above the filter medium outflow prevention screen.
- a coagulant adding device for adding a coagulant to the water to be treated introduced into the separation tank main body by the water to be treated introduction pipe;
- the present invention provides a coagulation sedimentation apparatus in which a coagulant is added to the water, and the water to be treated is supplied to the water introduction pipe through the upward flow path and the downward flow path.
- the coagulant can be mixed efficiently and reliably by passing the water to be treated through the vertical detour channel.
- the coagulant adding device includes two coagulant addition tanks sequentially arranged along the flow path of the water to be treated, and the upstream coagulant addition tank has an inorganic coagulant.
- the coagulant addition tank on the downstream side is configured to add an organic coagulant, so that the water to be treated to which the inorganic coagulant and the organic coagulant have been added is supplied to the water introduction pipe. To That can be S.
- An SS meter or turbidity meter that measures the concentration of suspended solids in the water to be treated
- a controller for calculating an appropriate amount of coagulant to be added to the water to be treated based on data measured by the flow meter, the M alkalinity meter, the SS meter or the turbidity meter. Can be provided.
- the water is added to the suspended solids of the water to be treated during no rainfall.
- the present invention provides
- An SS meter or turbidity meter that measures the concentration of suspended solids in the water to be treated
- a coagulation sedimentation device comprising:
- control for calculating an appropriate amount of coagulant to be added to the water to be treated can be equipped with a vessel.
- the treatment speed is higher than the sedimentation speed of the floc formed and formed by the coagulant. It is possible to perform a coagulation sedimentation process.
- the coagulant can be efficiently and reliably mixed with the water to be treated, and the coagulant can be used effectively.
- FIG. 1 is a conceptual diagram of a conventional coagulation-sedimentation apparatus.
- FIG. 2 is a conceptual diagram of the coagulation / sedimentation apparatus according to the present invention.
- FIG. 3 is a diagram showing a schematic configuration of a bypass mixing tank used in the present invention.
- FIG. 4 is a view showing a detour type mixing tank similar to FIG. 3, which is provided with a stirrer.
- FIG. 5 is a sectional view showing an example of the solid-liquid separation tank of the present invention.
- FIG. 6 is a sectional configuration diagram showing another example of the solid-liquid separation tank of the present invention.
- FIG. 7 is a graph showing the results of treated water treated by the solid-liquid separation tank in FIG. 5.
- FIG. 8 is a graph showing the relationship between the water to be treated and the turbidity of the treated water, to which the degree of M water pressure has been adjusted by adding sulfuric acid.
- FIG. 9 is a graph showing the relationship between the degree of inflow water at rainfall and the turbidity of treated water.
- FIG. 10 is a graph showing a change in M alkalinity when sewage during no rainfall is diluted with rainwater.
- FIG. 11 is a graph showing the relationship between the percentage (%) of sewage in a mixed solution, electrical conductivity, and M alkalinity.
- FIG. 12 is a graph showing the change over time in suspended solids concentration (SS) and M alkalinity of inflow water during rainfall.
- SS suspended solids concentration
- FIG. 13 is a graph showing a relationship between electric conductivity and M alkalinity.
- FIG. 2 shows an outline of the coagulation sedimentation apparatus 20 according to the present invention.
- the coagulation and sedimentation apparatus 20 includes an inorganic coagulant mixing tank 22, an organic coagulant mixing tank 24, and a solid-liquid separation tank 26. It is mixed with the inorganic coagulant in the inorganic coagulant mixing tank 22, and then mixed with the organic polymer coagulant in the organic coagulant mixing tank 24 and sent to the solid-liquid separation tank 26, where The suspended solids in the water to be treated are aggregated into flocs F in the liquid separation tank, and the flocs are settled and concentrated at the bottom of the solid-liquid separation tank 26 to be discharged as sludge, and the suspended solids are removed. The treated water W discharged from the upper part of the solid-liquid separation tank 26 is discharged.
- a to-be-treated water conduit for introducing the to-be-treated water S into the inorganic coagulant mixing tank 22 has a flow meter 30 for measuring a flow rate of the to-be-treated water S, An alkalinity meter 32 and an SS meter 34 for measuring the SS (suspended matter concentration) of the water to be treated are provided.
- the controller 36 controls the inorganic system based on the data measured by these measuring instruments.
- the pumps 42 and 44 of the coagulant tank 38 and the organic coagulant tank 40 the inorganic coagulant and the organic polymer coagulant are supplied to the inorganic coagulant mixing tank 22 and the organic coagulant mixing tank 24. Is controlled.
- FIG. 3 shows a coagulant mixing tank 50 in which the inorganic coagulant mixing tank 22 and the organic coagulant mixing tank 24 used in the present invention are integrated and formed into a bypass type.
- the mixing tank 50 is a vertical detour, which is provided with a total of eight sections that generate a downward flow and a section that generates an upward flow in order from the upstream side to the downstream side of the flow of the water to be treated. From the upstream side, the first section to the fourth section correspond to the inorganic coagulant mixing tank 22 described above, and the fifth section to the eighth section correspond to the organic coagulant mixing tank 24 described above. It has become equivalent to.
- the water to be treated S is added with an inorganic coagulant at the inlet of the water to be treated at the upstream end of the inorganic coagulant mixing tank 22, and the downward flow ⁇ the upward flow ⁇ the downward flow ⁇ the upward flow
- the mixture is made to flow countercurrently, mixed with the coagulant, and supplied to the upstream end (downstream end of the fourth section) of the organic polymer coagulant mixing tank 24, where the organic coagulant is added at the upstream end.
- the mixture with the organic coagulant is made by using the flow of the bypass mixing tank, and is sent to the solid-liquid separation tank 26 while forming a floc of the suspended substance. I'm familiar.
- the flow rate is maintained at 0.15 m / sec or more, preferably 0.17 m / sec or more until the organic polymer coagulant is added.
- the retention time is set to 100 seconds or more, and the solid-liquid separation is maintained at a flow rate of 0.15 m / sec or more, preferably 0.17 m / sec or more, even after the addition of the organic polymer flocculant. It is desirable to be able to maintain a residence time of 130 seconds or more before being introduced into the tank.
- FIG. 4 shows a bypass mixing tank according to another embodiment of the present invention, which has basically the same structure as that of FIG. 3.
- small stirrers 52 and 54 are installed to assist the dispersion of the flocculant.
- the diffusion operation can also be performed by adding fine holes to the addition nozzle in addition to the stirrer.
- the detour type mixing tank 50 according to the present invention shown in FIG. 3 is a vertical detour type with dimensions of 370 mm X 750 mm X effective depth 4550 mm and eight sections in a row, forming an inorganic coagulant mixing tank 22.
- ferric chloride is added to form the upstream end of the organic coagulant mixing tank.
- an anionic polymer flocculant was added.
- solid-liquid separation was performed by connecting a conventional solid-liquid separator.
- Table 1 shows the processing conditions and results of the flocculant mixing tests (a) and (b) using the apparatus of Fig. 3 and Fig. 4 and the flocculant mixing test using the conventional apparatus of Fig. 1. Show.
- the addition amount of the coagulant was the same, the addition amount of ferric chloride was 40 mg / L, and the anion-based polymer coagulant was 3. Omg / L.
- the stirring rotation speed of the stirrer in the apparatus of FIG. 4 and the conventional apparatus of FIG. 1 was 180 rpm.
- the effective capacity of both mixing tanks in the conventional equipment is 2.7m3, and the residence time of water is 54 seconds for both tanks.
- the time from the addition of ferric chloride to the addition of the anionic polymer flocculant is 105 seconds, and the time from the addition of the anion polymer flocculant to the inlet of the solid-liquid separation tank is 132 seconds. Seconds.
- the flow velocity in the bypass mixing tank was 0.18 mZ seconds under all conditions.
- the SS of the treated water treated by the solid-liquid separator was 19-72mg / L, whereas in the apparatus of Fig. 3, it was 15-54mg / L, and in the apparatus of Fig. 4, it was 15-42mg / L. / L.
- FIG. 5 shows an embodiment of the solid-liquid separation tank 26 according to the present invention.
- the solid-liquid separation soda is basically; a floc of suspended substance generated by adding a flocculant is precipitated, and the liquid to be treated from which the suspended substance is removed is provided in the upper part of the solid-liquid separation tank.
- the flow rate (flow velocity) of the upward treated water toward the discharge port is greater than the sedimentation speed of the floc, the floc is discharged.
- the solid-liquid separation tank 26 according to the present invention enables the processing speed of the water to be treated to be higher than the floc sedimentation speed without causing such a floc outflow.
- the solid-liquid separation tank 26 shown in FIG. 5 includes a separation tank main body 60 and a dividing member 64 which is set in the separation tank main body and divides the separation tank main body into an upper chamber 61 and a lower chamber 62.
- the treated water introduction pipe 66 for introducing the treated water S to which the coagulant was added into the upper chamber (as described above), the upper opening 70 opened to the upper chamber 61, and the opened lower chamber 62 It has a lower opening 72 and a treated water flow passage 74 for guiding a part of the treated water from the upper chamber 61 to the lower chamber 62.
- the upper chamber 61 has a first treated water discharge port 76 for discharging treated water to the outside at an upper portion thereof, and the lower chamber 62 has a lower opening 72 of the treated water flow passage.
- a sludge discharge port 80 for discharging concentrated flocs, that is, sludge F, is provided below the lower opening 72 of the water flow passage 74.
- the dividing member 64 is set at an interval from the inner surface of the peripheral wall of the separation tank main body 60, and is formed in a bowl shape that is concave toward the central portion.
- a funnel-shaped member 81 that is inclined downward from the inner surface of the peripheral wall of the separation tank main body 60 toward the center of the separation tank main body is set, and the water flow passage 74 to be treated is formed by the funnel-shaped member 81 And the dividing member 64.
- the water passage 74 to be treated is made to have substantially the same horizontal cross-sectional area in order to prevent the floc from breaking, so that the flow velocity does not change greatly over the entire area.
- the to-be-treated water introduction pipe 66 discharges the to-be-treated water S downward toward the central portion of the divided member 64.
- a floating filter medium 82, a filter medium outflow prevention screen 84 above the floating filter medium 82, and a filter medium receiving screen 86 below the floating filter medium 82 are provided above the upper chamber 61. Has been.
- a separator 88 is provided, and the separator 88 is slowly rotated by a motor 90 provided at the top of the separation tank main body 60, and flocs settled on the bottom of the separation tank main body. And is discharged from the sludge outlet 80 as concentrated floc, that is, sludge F.
- the second treated water discharge port 78 is provided with a flow control device 94 such as a pump, a valve, or a movable weir for controlling the flow rate of the treated water discharged from the discharge location.
- a flow control device 94 such as a pump, a valve, or a movable weir for controlling the flow rate of the treated water discharged from the discharge location.
- the turbidity of the separated water in the lower chamber was continuously measured by a turbidimeter, and based on the measured turbidity, The flow rate can be automatically controlled.
- the indicator of clarification is not limited to turbidity, but may be SS.
- reference numeral 96 denotes a rectifying plate for rectifying the upward flow in the lower chamber.
- the water to be treated S to which an inorganic coagulant such as ferric chloride and an organic coagulant such as anion-based polymer coagulant are sequentially added in advance is treated.
- the treated water is supplied downward from the inlet pipe 66 toward the dividing member 64.
- the supplied water to be treated is reversed in the dividing member 64 to become an upward flow, and the water to be treated is agitated so that suspended substances in the water to be treated are agglomerated to form flocs and further rise in the upper chamber 61. During that time, the flocks collide and coalesce.
- a flocking blanket layer in which flocs gather and stay is formed above the dividing member 64, and remains in the upward flow toward the first treated water discharge port 76 together with the floating filter medium 82. It performs the function of filtering suspended solids.
- the floc that has descended to the lower chamber 62 sinks downward in the lower chamber 62, is collected by the concentrator 88, becomes concentrated floc, ie, sludge, and is discharged from the sludge discharge unit 80.
- the water from which the flocks settled and was removed is discharged upward as a clear treated water W in the second chamber from the second treated water outlet 78.
- the flocs accumulated in the lower chamber are wound up. To prevent this, adjust the descending flow velocity to 5 mZ or less, preferably 2 mZ or less.
- FIG. 6 is a sectional view showing another example of the solid-liquid separation tank of the present invention. The difference from FIG. 5 is that the water to be treated flows into the upper chamber 61 through the draft tube 98. Is a point. The following is a processing test performed using the solid-liquid separation tank 26 of FIG.
- Separation soda body 60 having an inner diameter of 2,000 mm and a height of 6,500 mm was used.
- the processing conditions are as follows.
- Applicable flocculant Ferric chloride, anionic polymer flocculant
- Filter media unused
- FIG. 7 is a graph showing a change in water quality after treatment when the inflow water of the first sedimentation basin at the time of rainfall is treated water.
- the coagulation agent is added to the water to be treated, and the coagulation and sedimentation of the suspended substance in the water to be treated is performed. It is necessary to add an appropriate amount of flocculant according to the water quality in the water to generate an optimal flocculation reaction.
- the quality of the water to be treated includes particle concentration, pH, alkalinity of M, temperature, coexisting ions, and the like.
- the conventional control of the amount of the coagulant added is generally based on the particle concentration. That is, when the concentration of the suspended solids in the water to be treated is low, the addition amount of the flocculant is also reduced, and when the concentration of the suspended solids is high, the addition amount of the coagulant is increased.
- the M alkalinity of the water to be treated decreases due to the contamination of rainwater. If the M alkalinity decreases, the appropriate amount of flocculant added will decrease, even if the suspended solids concentration is the same. Therefore, if the amount of the flocculant to be added is controlled based on the concentration of the suspended substance, the flocculant will be excessively added, and the running cost will increase.
- the composition of suspended matter in the water to be treated changes due to the mixing of rainwater.
- the suspended solids contained in the treated water during rainfall are roughly classified into two types. One is that the suspended solids contained in the treated water during no rainfall are diluted by rainwater, and the other is the suspended solids that are mixed only during rainfall. These two types of suspended solids have different components, so the effectiveness of the flocculant is different, and even with the same suspended solids concentration, the appropriate amount of flocculant added is different. Therefore, it is inappropriate to set the amount of flocculant to be added to a mixture of these two types of suspended substances based on the concentration of the suspended substance in the whole liquid to be treated after mixing.
- the amount of the coagulant to be added can be controlled to an appropriate amount according to the quality of the water to be treated.
- this point will be described.
- the addition amount of the flocculant is controlled based on the M alkalinity or the electric conductivity of the water to be treated.
- the present invention relates to a combined sewer system,
- M alkalinity and electrical conductivity of sewage during rainfall are lower than sewage during no rainfall.
- the relationship between the alkalinity and the coagulation characteristics of the present invention will be described by taking the sewage during rainfall of a combined sewer system as an example.
- the present invention is not limited to the combined sewerage system, and is applicable to a coagulation process in which water whose M alkalinity or electric conductivity changes due to inflow of rainwater during rainfall is treated water.
- FIG. 8 shows the results of a jar test with water of the same chemical addition amount using water treated with sulfuric acid added to sewage during no rainfall and adjusted for M alkalinity as water to be treated. It is clear that the turbidity of the treated water decreases as the alkalinity of M decreases, even if the concentration of suspended solids in the treated water is the same.
- Fig. 9 shows the results of a jar test performed with the same amount of chemicals added, using sewage inflow at rainfall in a sewage treatment plant as treated water.
- the M alkalinity of the water to be treated decreases as the amount of rainwater mixed increases, and the turbidity of the treated water decreases as the M alkalinity decreases.
- Fig. 10 shows the M alkalinity when sewage during no rainfall is diluted with rainwater, and the M alkalinity decreases according to the ratio of sewage in the mixture of rainwater and sewage. are doing.
- the M alkalinity of the sewage during no rainfall is confirmed in advance, and the dilution factor with rainwater can be calculated by measuring the M alkalinity of the sewage during rainfall.
- the M alkalinity of sewage during no rainfall is generally 150 200 mg / Las CaC ⁇ 3, which varies depending on the time and day of the week, so it is desirable to confirm the value according to them.
- FIG. 11 shows the electrical conductivity and M alkalinity when sewage during no rainfall is diluted with rainwater.
- the electrical conductivity decreases according to the ratio of sewage in the mixture of rainwater and sewage.
- FIG. 13 is a diagram showing the relationship between the electrical conductivity and the M alkalinity in FIG. 11, and the correlation between the two is extremely good. Therefore, similarly to the M alkalinity, it is possible to calculate the dilution ratio by rainwater by measuring the electric conductivity of sewage during rainfall, and furthermore, it is possible to estimate the M alkali.
- Fig. 12 is an actual measurement example of the change over time in the suspended solids concentration (SS) and the M alkalinity in the sewage treatment plant during rainfall.
- SS suspended solids concentration
- M alkalinity M alkalinity in the sewage treatment plant during rainfall.
- Rainfall occurs from 15:00 to 19:00, and sewage is diluted by rainwater flowing into the sewer, and the alkalinity of M decreases rapidly.
- the reason why M alkalinity has continued to decrease since 19:00, when rainfall ended, is that there is a time until rainwater flows into the sewer and a time during which rainwater flows into the sewer to the treatment plant. is there .
- the dilution ratio with rainwater can be determined.
- the M alkalinity of sewage in no rainfall is about 180 mg ZL as CaC ⁇ 3, whereas the value in rainfall is about 80 mg / Las CaC03. Therefore, the sewage during no rainfall is diluted about 2.3 times by the rainwater.
- SS in FIG. 12 is also a larger value than when SS is diluted at the same magnification as the dilution magnification calculated from the force M alkalinity that changes over time.
- the SS of non-rainfall sewage is about 200 mg / L, and when SS is calculated based on the dilution factor 2.3 times calculated from M alkalinity, it is reduced to about 87 mg / L.
- the actual SS is about 300 mg / L, which is about 210 mg / L larger than the value calculated from the dilution ratio with rainwater.
- the pollutant that had accumulated on the road surface before rainfall flowed in along with the rainwater, and the pollutant that accumulated in the sewer sewer was washed away by the increase in water volume due to the inflow of rainwater.
- the suspended matter contained in the water to be treated during rainfall is a mixture of the suspended matter contained in the water to be treated during no rainfall diluted with rainwater and the suspended matter that increases during rainfall. Yes, based on M alkalinity, it is possible to calculate each concentration.
- SS1 is converted into non-rainfall sewage based on M alkalinity (A1).
- the suspension material is divided into a diluted component (SS2) and a component increased during rainfall (SS3), and the amount of coagulant added (M2, M3) for each component is calculated, and the total is M2 + M3
- M2 + M3 Can be the amount of flocculant added (Ml) corresponding to SS1.
- the flow rate is measured by the flow meter 30, the M alkalinity is measured by the M alkalinity meter 32, and the SS Is measured.
- the appropriate amount of inorganic coagulant (N1) and the amount of organic is calculated, and the addition flow amount to the total amount of the water to be treated is calculated based on the addition amount and the flow amount Q1, and the inorganic coagulant injection pump 42 and the organic polymer coagulant injection pump 44 Control.
- the dilution ratio (D-fold dilution) with rainwater is determined by comparing the M alkalinity (A1) with a value measured in advance without rainfall. At this time, if the value at the time of no rainfall differs depending on the day of the week and the time, the value corresponding to the day of the week and the time are confirmed and the comparison is performed.
- SS1 (suspended matter concentration during rainfall) is calculated based on the suspended solids concentration SS2 of the diluted SS and the suspended solids concentration SS2 of the diluted SS. Divide into suspended solids concentration SS3.
- electric conductivity can be measured, and calculation can be performed based on the electric conductivity.
- turbidity may be measured instead of SS, and SS may be converted from turbidity.
- Table 2 shows the results of the control based on the present invention and the control based on the conventional method.
- the average removal rate of suspended matter is 90%, and the proportional control based on the water SS to be treated, which is a conventional control method, is performed. It was equivalent to the expected average removal rate of SS.
- the amount of the added flocculant in the present invention could be reduced by 24% for the inorganic flocculant and 33% for the organic polymer flocculant.
- the concentration of suspended solids in the water to be treated changes due to the inflow of rainwater during rainfall, the concentration of suspended solids in the water to be treated, the M alkalinity, or the electric conductivity
- the appropriate coagulant addition amount based on these values, excessive addition of the coagulant can be prevented, and low-cost operation and high-quality treated water can be stably provided.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04745265A EP1637205A1 (en) | 2003-05-22 | 2004-05-21 | Flocculaing settling device |
CA002526524A CA2526524A1 (en) | 2003-05-22 | 2004-05-21 | Coagulation-sedimentation apparatus |
US10/558,315 US20070175804A1 (en) | 2003-05-22 | 2004-05-21 | Coagulation-sedimentation apparatus |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003144891A JP3888984B2 (ja) | 2003-05-22 | 2003-05-22 | 合流式下水道の下水の処理方法と装置 |
JP2003-144891 | 2003-05-22 | ||
JP2003157786A JP3856314B2 (ja) | 2003-06-03 | 2003-06-03 | 凝集沈殿方法及び装置 |
JP2003-157786 | 2003-06-03 | ||
JP2003198447A JP2005034712A (ja) | 2003-07-17 | 2003-07-17 | 雨水混入水の処理方法と装置 |
JP2003-198447 | 2003-07-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004103521A1 true WO2004103521A1 (ja) | 2004-12-02 |
Family
ID=33479643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/006954 WO2004103521A1 (ja) | 2003-05-22 | 2004-05-21 | 凝集沈殿装置 |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1637205A1 (ja) |
CA (1) | CA2526524A1 (ja) |
WO (1) | WO2004103521A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113213664A (zh) * | 2021-05-26 | 2021-08-06 | 南宁兴科净医疗科技有限公司 | 一种废水处理用高效沉淀器 |
CN114314926A (zh) * | 2021-12-31 | 2022-04-12 | 新沂市新南环保产业技术研究院有限公司 | 一种工业废水沉降装置及其工作方法 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE530104C2 (sv) * | 2006-07-17 | 2008-03-04 | B G Consulting Hb | Sätt och anordning för kemisk rening av avfallsvatten |
GB2502670B (en) * | 2012-03-21 | 2015-01-14 | Innovative Ind Ltd | Water recycling unit |
EP2828204A2 (en) * | 2012-03-21 | 2015-01-28 | Innovative Industries Limited | Water recycling unit |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61178069U (ja) * | 1985-04-26 | 1986-11-06 | ||
JPH06226011A (ja) * | 1993-02-03 | 1994-08-16 | Hitachi Ltd | 水処理凝集プロセスにおける凝集剤注入制御方法、及び、凝集剤注入制御装置 |
JPH09290273A (ja) * | 1996-04-26 | 1997-11-11 | Kurita Water Ind Ltd | 凝集剤添加量調整方法及び装置 |
JP2002166152A (ja) * | 2000-11-29 | 2002-06-11 | Araco Corp | 撹拌水槽 |
JP2004008909A (ja) * | 2002-06-06 | 2004-01-15 | Ebara Corp | 凝集沈殿方法及び装置 |
-
2004
- 2004-05-21 EP EP04745265A patent/EP1637205A1/en not_active Withdrawn
- 2004-05-21 CA CA002526524A patent/CA2526524A1/en not_active Abandoned
- 2004-05-21 WO PCT/JP2004/006954 patent/WO2004103521A1/ja not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61178069U (ja) * | 1985-04-26 | 1986-11-06 | ||
JPH06226011A (ja) * | 1993-02-03 | 1994-08-16 | Hitachi Ltd | 水処理凝集プロセスにおける凝集剤注入制御方法、及び、凝集剤注入制御装置 |
JPH09290273A (ja) * | 1996-04-26 | 1997-11-11 | Kurita Water Ind Ltd | 凝集剤添加量調整方法及び装置 |
JP2002166152A (ja) * | 2000-11-29 | 2002-06-11 | Araco Corp | 撹拌水槽 |
JP2004008909A (ja) * | 2002-06-06 | 2004-01-15 | Ebara Corp | 凝集沈殿方法及び装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113213664A (zh) * | 2021-05-26 | 2021-08-06 | 南宁兴科净医疗科技有限公司 | 一种废水处理用高效沉淀器 |
CN114314926A (zh) * | 2021-12-31 | 2022-04-12 | 新沂市新南环保产业技术研究院有限公司 | 一种工业废水沉降装置及其工作方法 |
Also Published As
Publication number | Publication date |
---|---|
CA2526524A1 (en) | 2004-12-02 |
EP1637205A1 (en) | 2006-03-22 |
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