CN111908726A - Method and device for treating sewage generated by low sludge rate - Google Patents
Method and device for treating sewage generated by low sludge rate Download PDFInfo
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- CN111908726A CN111908726A CN202010839702.4A CN202010839702A CN111908726A CN 111908726 A CN111908726 A CN 111908726A CN 202010839702 A CN202010839702 A CN 202010839702A CN 111908726 A CN111908726 A CN 111908726A
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- 239000010865 sewage Substances 0.000 title claims abstract description 67
- 239000010802 sludge Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 20
- AHEWZZJEDQVLOP-UHFFFAOYSA-N monobromobimane Chemical compound BrCC1=C(C)C(=O)N2N1C(C)=C(C)C2=O AHEWZZJEDQVLOP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 238000005273 aeration Methods 0.000 claims abstract description 48
- 238000004062 sedimentation Methods 0.000 claims abstract description 46
- 239000012528 membrane Substances 0.000 claims abstract description 45
- 239000000835 fiber Substances 0.000 claims abstract description 44
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000001301 oxygen Substances 0.000 claims abstract description 31
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 31
- 239000000945 filler Substances 0.000 claims abstract description 15
- 238000007599 discharging Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- 239000011574 phosphorus Substances 0.000 claims description 7
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 claims description 5
- 238000006731 degradation reaction Methods 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 230000007062 hydrolysis Effects 0.000 claims description 4
- 238000006460 hydrolysis reaction Methods 0.000 claims description 4
- 244000005700 microbiome Species 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000004659 sterilization and disinfection Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 230000020477 pH reduction Effects 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000005416 organic matter Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005276 aerator Methods 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012765 fibrous filler Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000036561 sun exposure Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The main technical solution of the application is to provide a method and a device for treating sewage generated by low sludge rate, which consists of an ABR pool, a primary MBBR pool, a secondary sedimentation pool, a fiber bundle membrane pool and a device room. The ABR tank, the secondary sedimentation tank and the fiber bundle membrane tank are provided with emptying pipes for discharging sludge, and a sludge return pipe is arranged at the bottom of the secondary sedimentation tank and returns the sludge to the last compartment of the ABR tank, so that the stability of the system is ensured; the first-stage MBBR tank is filled with a certain proportion of spherical filler, and the bottom of the first-stage MBBR tank is provided with a first aeration device; the secondary MBBR tank is filled with a certain proportion of spherical filler and provided with a dissolved oxygen meter, and the bottom of the secondary MBBR tank is provided with a second aeration device which can be controlled by the concentration of dissolved oxygen; the fiber bundle membrane pond is filled with fiber bundle membranes in a certain proportion, and the bottom of the fiber bundle membrane pond is provided with a third aeration device which can be controlled by the concentration of dissolved oxygen; a PLC control cabinet is installed in the equipment room, and the start and stop of the whole device can be controlled.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method and a device for treating sewage with low sludge rate.
Background
At present, village and town sewage treatment becomes a key direction generally concerned by all parties, but the rural economic foundation and the technical level are relatively weak, so that how to realize village and town sewage treatment measures can be 'built, the use is good, the maintenance is simple', the phenomenon that 'building is carried out without sun exposure' is avoided, and the method becomes a competitive research object for environmental protection people. Although integrated village and town sewage equipment is mature gradually after the development of a few years, most of sewage equipment focuses on achieving the standard discharge of water quality effluent, and the consideration on achieving sludge reduction and resource utilization is deficient. In the Anaerobic Baffled Reactor (ABR) process, microbial solids in the Reactor are expanded and precipitated up and down in each compartment formed by baffling plates by means of gas generated in the Reactor in the treatment process, water flow in the whole Reactor flows horizontally at a slower speed, the water flow flows around the baffling plates to increase the total length of the water flow flowing through the Reactor, and the biological solids are effectively retained in the Reactor by the blocking of the baffling plates and the sedimentation of sludge. Moving bed biofilm reactors (MBBR process) are a novel biofilm reactor, and are improved novel composite biofilm reactors developed on the basis of fixed bed reactors, fluidized bed reactors and biofilters. The method overcomes the defects that a fixed bed reactor needs regular back flushing, a fluidized bed reactor needs carrier fluidization, a biological filter is blocked and needs to be cleaned, and the aerator needs to be replaced, and also keeps the characteristics of impact load resistance, low sludge yield and long sludge age of the traditional biomembrane method. The reduction of sewage and sludge in villages and towns is realized, the sludge treatment cost can be saved, the operation cost is reduced, the method is an inherent requirement for the construction of beautiful villages, and the method has good economic benefit and social benefit.
Content of application
The invention aims to overcome the problem of large amount of sludge remaining in sewage treatment in the prior art, and provides a sewage treatment device with low sludge rate.
In order to achieve the above object, the main technical solution of the present application is to provide a sewage treatment device with low sludge rate, which is characterized in that: the method comprises the following steps:
ABR ponds arranged in 4 compartments, the first compartment having a longer hydraulic retention time than the last three compartments;
the bottom of the primary MBBR tank is connected with a first aeration device, and the primary MBBR tank is communicated with the ABR tank;
the bottom of the secondary MBBR tank is connected with a second aeration device, and the primary MBBR tank is communicated with the secondary MBBR tank;
the bottom of the secondary sedimentation tank is provided with a sludge return pipe, the sludge return pipe is connected with the ABR tank, and the secondary sedimentation tank is communicated with the secondary MBBR tank, so that the sludge can be returned to the last compartment of the ABR tank from the secondary sedimentation tank, and the sludge concentration of the system can be maintained;
the bottom of the fiber bundle membrane tank is connected with a third aeration device, and the fiber bundle membrane tank is connected with an overflow trough;
and a PLC control cabinet and a fan are arranged in the equipment room and used for controlling signals of the equipment.
Further, it is characterized in that: the first room in ABR pond is connected with the water inlet, ABR mud discharging port is connected with in ABR pond first room bottom, the fourth compartment in ABR pond communicates with each other with one-level MBBR pond through one-level MBBR pond inlet tube.
Further, it is characterized in that: the one-level MBBR pond is equipped with a inlet tube, the inlet tube is central tube formula.
Further, it is characterized in that: the first aeration device is connected to a PLC control cabinet between the devices through signals, and the start and stop of the aeration device can be controlled conveniently through time intervals.
Further, it is characterized in that: the inner part of the first-stage MBBR pool is filled with a fixed layer of spherical filler, the filling proportion is 40% of the effective volume of the first-stage MBBR pool, the middle part of the second-stage MBBR pool is filled with the spherical filler, and the filling volume is 40% of the effective volume of the second-stage MBBR pool.
Further, it is characterized in that: the internally mounted in second grade MBBR pond has dissolved oxygen appearance, dissolved oxygen appearance and second aeration equipment signal all are connected to the PLC switch board between the equipment, are convenient for control aeration equipment through detecting the inside dissolved oxygen in second grade MBBR pond and open and stop.
Further, it is characterized in that: the filler of the fiber bundle membrane is fiber filler, and the filling proportion is 70% of the effective volume of the fiber bundle membrane pool.
Further, it is characterized in that: the secondary sedimentation tank adopts a vertical flow sedimentation tank, a central pipe is arranged in the middle of the vertical flow sedimentation tank, the lower part of the central pipe is connected with a reflecting plate, and the bottom of the secondary sedimentation tank is connected with a sludge discharge port so as to be used for discharging residual sludge regularly.
Further, it is characterized in that: the fiber bundle membrane tank is filled with fiber bundle membranes, and the bottom of the fiber bundle membrane tank is connected with a vent pipe.
The application provides a treatment method of a sewage treatment device with low sludge rate, which is characterized by comprising the following steps:
(1) villages and small towns sewage gets into the ABR pond through the water inlet, and the ABR pond design is four rooms, the room of rising: downflow chamber 4: 1, the flow rate of a baffling port is more than 1.10mm/s, a water inlet is connected to a first chamber of the ABR tank, water enters the middle of the ABR tank, the separation of hydrolysis and acidification inside the ABR tank is realized by setting hydraulic retention time, macromolecular organic matters are degraded into micromolecular organic matters which are easily utilized by microorganisms, and the biodegradability of the inlet water is improved;
(2) then the sewage enters a first-stage MBBR tank through a first-stage MBBR tank water inlet pipe; the first-level MBBR tank realizes the removal of organic matters, ammonia nitrogen and phosphorus in the sewage through intermittent aeration. Then, the sewage enters a second-level MBBR tank through a water outlet of the first-level MBBR tank to further degrade COD in the sewage;
(3) the aeration of the second-stage MBBR tank is controlled by adopting dissolved oxygen, when the dissolved oxygen in the second-stage MBBR tank is low, a second aeration device is started to ensure that the dissolved oxygen in the second-stage MBBR tank is sufficient, and COD (chemical oxygen demand), ammonia nitrogen and phosphorus indexes in the sewage after passing through the first-stage MBBR tank and the second-stage MBBR tank basically meet the discharge requirement;
(4) sewage enters a secondary sedimentation tank through a central pipe, a sludge return pipe is arranged at the bottom of the secondary sedimentation tank, the secondary sedimentation tank is started at regular intervals, sludge is returned to the last compartment of the ABR tank, and the sludge concentration of the whole system is ensured;
(5) sewage after the secondary sedimentation tank is filled with the fiber bundle membrane in the fiber bundle membrane tank arranged at the rear end, the treated sewage is subjected to SS interception and further degradation of COD (chemical oxygen demand), the dissolved oxygen in the fiber bundle membrane tank is too low for avoiding the low content of the dissolved oxygen, a third aeration device is arranged at the bottom of the fiber bundle membrane tank, the third aeration device is started and stopped according to the concentration of the dissolved oxygen in the tank, an aerobic environment is created, finally, the sewage passes through an overflow groove and a discharge port and is discharged after disinfection
To sum up, the technical scheme of this application can reach following beneficial effect:
1. the device integrally adopts the technological process of ABR + primary MBBR + secondary sedimentation tank + fiber bundle membrane tank, and has the characteristics of low sludge yield, simple and convenient operation and maintenance, strong impact resistance, stable water outlet and the like.
2. The ABR pond in the device through certain water conservancy dwell time design, can realize the separation of hydrolysis, acidizing process, greatly reduced integration villages and small towns sewage equipment's mud production volume, on the other hand, can collect the gas production volume in the ABR reaction tank, realize villages and small towns sewage organic matter resource utilization.
3. The one-level MBBR pond among the device adopts and is interrupted the aeration, and the aeration is controlled to second grade MBBR pond adoption dissolved oxygen, through the design of water conservancy dwell time, can realize higher pollutant removal effect.
4. The effluent after passing through the secondary sedimentation tank often can not satisfy the SS standard of village and town sewage effluent, and the fiber bundle membrane tank is added behind the secondary sedimentation tank, so that on one hand, the SS in the effluent of the secondary sedimentation tank can be intercepted, and on the other hand, the COD in the effluent can be further degraded, and the stable standard reaching of the effluent is realized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic top view of a low sludge rate sewage treatment plant according to the present invention.
FIG. 2 is a schematic sectional view of an A-A section of a sewage treatment apparatus for low sludge rate generation according to the present invention.
FIG. 3 is a schematic cross-sectional view of a B-B sewage treatment apparatus for low sludge rate generation according to the present invention.
FIG. 4 is a schematic cross-sectional view of a C-C section of a sewage treatment apparatus for low sludge rate generation according to the present invention.
In the figure: 1-ABR pool; 1 a-a water inlet; 1 b-a first-level MBBR pool water inlet pipe; 1c-ABR sludge discharge port; 2-first-level MBBR pool; 2 a-a water outlet of the first-level MBBR tank; 2 b-spherical filler a; 2 c-a first aeration device; 3-a second-level MBBR pool; 3 a-spherical filler b; 3 b-a second aeration device; 4-secondary sedimentation tank; 4 a-a central tube; 4 b-a sludge discharge port of the secondary sedimentation tank; 4 c-a sludge return pipe; 5-fiber bundle membrane tank; 5 a-a water outlet pipe of the secondary sedimentation tank; 5 b-an overflow launder; 5 c-a blow-down pipe; 5 d-fibrous fillers; 5 e-an aeration system; 6-water outlet; 7-equipment room.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, 2, 3 and 4, a sewage treatment apparatus with a low sludge rate generation includes: the ABR pool 1 is designed into four chambers, an upstream chamber: downflow chamber 4: 1 or so, the flow velocity of the baffling port is more than 1.10mm/s, and the hydraulic retention time of the first compartment is longer than that of the last three compartments; the first chamber of the ABR tank 1 is connected with a water inlet 1a, the middle part of the first chamber is filled with water, and the bottom of the first chamber of the ABR tank 1 is connected with an ABR sludge discharge port 1c for discharging accumulated sludge; the last compartment of ABR pond 1 communicates with each other with one-level MBBR pond 2 through one-level MBBR pond inlet tube 1b, one-level MBBR pond inlet tube 1b is central tubular, drains ABR pond 1 to one-level MBBR pond 2 bottoms.
One-level MBBR pond 2, one-level MBBR pond 2 is connected with ABR pond 1 and is communicated with each other, one-level MBBR pond 2, its middle part is filled with spherical filler a2b, and the packing proportion is 40% of one-level MBBR pond 2 effective volume, and first aeration equipment 2c is installed to the bottom, first aeration equipment 2c opens through time controller control aeration and stops, realizes the intermittent type aeration in one-level MBBR pond 2, improves system's nitrogen and phosphorus removal ability.
Second grade MBBR pond 3, one-level MBBR pond 2 is connected with second grade MBBR pond 3 and is communicated with each other, second grade MBBR pond 3 is the same with one-level MBBR pond through one-level MBBR pond delivery port 2a, and its middle part is filled with spherical filler b3a, and the packing proportion is 40% of second grade MBBR pond 3 effective volume, and second aeration equipment 3b is installed to the bottom, second aeration equipment 3b opens through dissolved oxygen concentration control aeration systems and stops, reaches better COD and gets rid of the effect.
The secondary sedimentation tank 4 is communicated with the secondary MBBR tank 3, so that sludge can flow back from the secondary sedimentation tank 4 to the last compartment of the ABR tank 1 to maintain the sludge concentration of the system; the secondary sedimentation tank 4 is communicated with the secondary MBBR tank 3 through a central pipe 4a, the bottom of the secondary sedimentation tank is connected with a sludge return pipe 4c, the sludge return pipe 4c is connected with the ABR tank 1, sludge in the secondary sedimentation tank 4 returns to the last compartment of the ABR tank 1 through a sludge return pump at regular intervals, the sludge amount of the system is ensured, and the bottom of the secondary sedimentation tank 4 is connected with a secondary sedimentation tank sludge discharge port 4b for discharging residual sludge.
The fiber bundle membrane tank 5 is connected with the overflow tank 5b, the fiber bundle membrane tank 5 is filled with fiber filler 5d, the filling proportion is 70% of the effective volume of the fiber bundle membrane tank 5, the bottom of the fiber bundle membrane tank 5 is connected with a third aeration device 5e, and the third aeration device 5e controls the start and stop of the fiber bundle membrane tank 5 through dissolved oxygen. The fiber bundle membrane tank 5 is connected with an overflow tank 5b, and the treated sewage passes through the overflow tank 5b and then is discharged through a discharge port 6.
And a PLC control cabinet and a fan are arranged in the equipment room 7 and used for controlling signals of the equipment. The equipment room 7 is internally provided with fan equipment and a PLC control cabinet which can control corresponding pumps and fans.
The principle of the invention is illustrated as follows:
when the system is specifically implemented, sewage in villages and towns enters the ABR pool 1 through the water inlet 1a, and ABR can be realized through HRT arrangement
The separation of 1 inside hydrolyzation in pond and acidizing, with the micromolecule organic matter degradation for being easily utilized by the microorganism, improve the biodegradability of intaking, in addition, after the abundant reaction in ABR pond 1, with the mud output of greatly reduced system. Sewage then gets into one-level MBBR pond 2 through one-level MBBR pond inlet tube 1b, and one-level MBBR pond 2 opens through time controller control aeration through first aeration equipment 2c and stops, realizes the intermittent type aeration in one-level MBBR pond 2, can realize getting rid of organic matter, ammonia nitrogen and phosphorus in the sewage. Sewage gets into second grade MBBR pond 3 through 2 delivery ports in one-level MBBR pond subsequently, carries out further degradation to the COD in the sewage, and second aeration equipment 3b in second grade MBBR pond 3 adopts dissolved oxygen control, will start second aeration equipment 3b when dissolved oxygen is lower in second grade MBBR pond 3, guarantees that the dissolved oxygen in second grade MBBR pond 3 is sufficient. COD, ammonia nitrogen and phosphorus indexes in the sewage after passing through the first-stage MBBR tank 2 and the second-stage MBBR tank 3 basically meet the discharge requirement. The sewage then enters a secondary sedimentation tank 4 through a central pipe 4a, a sludge return pipe 4c is arranged at the bottom of the secondary sedimentation tank 4, and the sludge return pipe is started at regular intervals to return the sludge to the final compartment of the ABR tank 1, so that the sludge concentration of the whole system is ensured. The SS content of the sewage passing through the secondary sedimentation tank 4 can not reach the discharge standard generally, therefore, a fiber bundle membrane tank 5 is arranged at the rear end, a fiber bundle membrane 5d is filled inside the fiber bundle membrane tank, the filling proportion is 70% of the effective volume of the fiber bundle membrane tank, SS interception and COD further degradation are carried out on the treated sewage, in order to avoid too low dissolved oxygen inside the fiber bundle membrane tank 5, a third aeration device 5e is installed at the bottom of the fiber bundle membrane tank 5, the third aeration device 5e is started and stopped according to the dissolved oxygen concentration in the tank, an aerobic environment is created, backwashing on the fiber bundle membrane can be realized, and finally the sewage passes through an overflow trough 5b and a discharge port 6 and is discharged after disinfection.
To sum up, the sewage treatment plant that low mud rate of this application produced can reach following beneficial effect:
1. the device integrally adopts the technological process of ABR + primary MBBR + secondary sedimentation tank + fiber bundle membrane tank, and has the characteristics of low sludge yield, simple and convenient operation and maintenance, strong impact resistance, stable water outlet and the like.
2. The ABR pond in the device through certain water conservancy dwell time design, can realize the separation of hydrolysis, acidizing process, greatly reduced integration villages and small towns sewage equipment's mud production volume, on the other hand, can collect the gas production volume in the ABR reaction tank, realize villages and small towns sewage organic matter resource utilization.
3. The one-level MBBR pond among the device adopts and is interrupted the aeration, and the aeration is controlled to second grade MBBR pond adoption dissolved oxygen, through the design of water conservancy dwell time, can realize higher pollutant removal effect.
4. The effluent after passing through the secondary sedimentation tank often can not satisfy the SS standard of village and town sewage effluent, and the fiber bundle membrane tank is added behind the secondary sedimentation tank, so that on one hand, the SS in the effluent of the secondary sedimentation tank can be intercepted, and on the other hand, the COD in the effluent can be further degraded, and the stable standard reaching of the effluent is realized.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A sewage treatment plant that low sludge rate produced which characterized in that: the method comprises the following steps:
ABR ponds arranged in 4 compartments, the first compartment having a longer hydraulic retention time than the last three compartments;
the bottom of the primary MBBR tank is connected with a first aeration device, and the primary MBBR tank is communicated with the ABR tank;
the bottom of the secondary MBBR tank is connected with a second aeration device, and the primary MBBR tank is communicated with the secondary MBBR tank;
the bottom of the secondary sedimentation tank is provided with a sludge return pipe, the sludge return pipe is connected with the ABR tank, and the secondary sedimentation tank is communicated with the secondary MBBR tank;
the bottom of the fiber bundle membrane tank is connected with a third aeration device, and the fiber bundle membrane tank is connected with an overflow trough;
and a PLC control cabinet and a fan are arranged in the equipment room and used for controlling signals of the equipment.
2. The apparatus for treating sewage with low sludge rate according to claim 1, wherein: the first room in ABR pond is connected with the water inlet, ABR mud discharging port is connected with in ABR pond first room bottom, the fourth compartment in ABR pond communicates with each other with one-level MBBR pond through one-level MBBR pond inlet tube.
3. The apparatus for treating sewage with low sludge rate according to claim 1, wherein: the one-level MBBR pond is equipped with a inlet tube, the inlet tube is central tube formula.
4. The apparatus for treating sewage with low sludge rate according to claim 1, wherein: the first aeration device is connected with a PLC control cabinet between the devices through signals.
5. The apparatus for treating sewage with low sludge rate according to claim 1, wherein: the inner part of the first-stage MBBR pool is filled with a fixed layer of spherical filler, the filling proportion is 40% of the effective volume of the first-stage MBBR pool, the middle part of the second-stage MBBR pool is filled with the spherical filler, and the filling volume is 40% of the effective volume of the second-stage MBBR pool.
6. The apparatus for treating sewage with low sludge rate according to claim 1, wherein: and a dissolved oxygen instrument is arranged in the secondary MBBR tank, and signals of the dissolved oxygen instrument and the second aeration device are connected to a PLC control cabinet between the devices.
7. The apparatus for treating sewage with low sludge rate according to claim 1, wherein: the filler of the fiber bundle membrane is fiber filler, and the filling proportion is 70% of the effective volume of the fiber bundle membrane pool.
8. The apparatus for treating sewage with low sludge rate according to claim 1, wherein: the secondary sedimentation tank adopts a vertical flow sedimentation tank, a central pipe is arranged in the middle of the vertical flow sedimentation tank, the lower part of the central pipe is connected with a reflecting plate, and the bottom of the secondary sedimentation tank is connected with a sludge discharge port.
9. The apparatus for treating sewage with low sludge rate according to claim 1, wherein: the fiber bundle membrane tank is filled with fiber bundle membranes, and the bottom of the fiber bundle membrane tank is connected with a vent pipe.
10. A treatment method of a sewage treatment device with low sludge rate is characterized by comprising the following steps:
(1) villages and small towns sewage gets into the ABR pond through the water inlet, and the ABR pond design is four rooms, the room of rising: downflow chamber 4: 1, the flow rate of a baffling port is more than 1.10mm/s, a water inlet is connected to a first chamber of the ABR tank, water enters the middle of the ABR tank, the separation of hydrolysis and acidification inside the ABR tank is realized by setting hydraulic retention time, macromolecular organic matters are degraded into micromolecular organic matters which are easily utilized by microorganisms, and the biodegradability of the inlet water is improved;
(2) then the sewage enters a first-stage MBBR tank through a first-stage MBBR tank water inlet pipe; the first-level MBBR tank realizes the removal of organic matters, ammonia nitrogen and phosphorus in the sewage through intermittent aeration. Then, the sewage enters a second-level MBBR tank through a water outlet of the first-level MBBR tank to further degrade COD in the sewage;
(3) the aeration of the second-stage MBBR tank is controlled by adopting dissolved oxygen, when the dissolved oxygen in the second-stage MBBR tank is low, a second aeration device is started to ensure that the dissolved oxygen in the second-stage MBBR tank is sufficient, and COD (chemical oxygen demand), ammonia nitrogen and phosphorus indexes in the sewage after passing through the first-stage MBBR tank and the second-stage MBBR tank basically meet the discharge requirement;
(4) sewage enters a secondary sedimentation tank through a central pipe, a sludge return pipe is arranged at the bottom of the secondary sedimentation tank, the secondary sedimentation tank is started at regular intervals, sludge is returned to the last compartment of the ABR tank, and the sludge concentration of the whole system is ensured;
(5) through the sewage behind the secondary sedimentation pond, it has the tow membrane to set up tow membrane pond inside packing at the rear end, carries out SS interception and COD's further degradation to the sewage after handling, and low excessively for avoiding tow membrane pond inside dissolved oxygen, installs third aeration equipment in tow membrane pond bottom, and third aeration equipment opens according to pond dissolved oxygen concentration and stops, builds aerobic environment, and sewage passes through overflow launder and discharge port at last, discharges after the disinfection.
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| CN115159782A (en) * | 2022-07-22 | 2022-10-11 | 海南水伊方环境科技有限公司 | Method for treating coconut milk processing wastewater |
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| CN115159782A (en) * | 2022-07-22 | 2022-10-11 | 海南水伊方环境科技有限公司 | Method for treating coconut milk processing wastewater |
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