CN110818084A - Composite anaerobic membrane bioreactor system and process thereof - Google Patents
Composite anaerobic membrane bioreactor system and process thereof Download PDFInfo
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- CN110818084A CN110818084A CN201911266723.5A CN201911266723A CN110818084A CN 110818084 A CN110818084 A CN 110818084A CN 201911266723 A CN201911266723 A CN 201911266723A CN 110818084 A CN110818084 A CN 110818084A
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- 239000012528 membrane Substances 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 title claims abstract description 27
- 239000002131 composite material Substances 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000010865 sewage Substances 0.000 claims abstract description 37
- 238000011282 treatment Methods 0.000 claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000945 filler Substances 0.000 claims abstract description 12
- 238000010992 reflux Methods 0.000 claims description 25
- 239000010802 sludge Substances 0.000 claims description 22
- 238000001914 filtration Methods 0.000 claims description 19
- 230000014759 maintenance of location Effects 0.000 claims description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 2
- 239000002028 Biomass Substances 0.000 description 6
- 244000005700 microbiome Species 0.000 description 5
- 238000010008 shearing Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 4
- 230000029087 digestion Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011221 initial treatment Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Classifications
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2833—Anaerobic digestion processes using fluidized bed reactors
-
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/286—Anaerobic digestion processes including two or more steps
-
- 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
- C02F2301/04—Flow arrangements
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biological Treatment Of Waste Water (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a composite anaerobic membrane bioreactor system, which comprises: the fluidized bed anaerobic bioreactor is internally provided with granular activated carbon filler, and the side wall of the fluidized bed anaerobic bioreactor is provided with a water outlet pipe and an air outlet pipe; the bottom of the airlift anaerobic membrane bioreactor is connected with a water outlet pipe and an air outlet pipe of the fluidized bed anaerobic bioreactor, and the top of the airlift anaerobic membrane bioreactor is provided with an exhaust pipe. The invention integrates the advantages of various AnMBR technologies through skillful design and reasonable process combination, and provides a more stable, efficient, flexible and economic domestic sewage treatment process.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a composite anaerobic membrane bioreactor system and a process thereof.
Background
The current sewage treatment process is developing towards the trends of high efficiency, energy conservation and resource recycling, so that the anaerobic treatment process is gradually favored by the industry. Compared with the aerobic treatment process, the anaerobic treatment process does not need aeration, so that the energy consumption is greatly reduced, and the anaerobic treatment process can convert organic components in the sewage into novel energy biogas, thereby realizing the recovery of energy. The cost of treating the excess sludge is reduced due to the lower growth rate of anaerobic microorganisms. However, also because of the low growth rate of anaerobic microorganisms, a relatively high sludge age is often required in actual practice to maintain biological activity, thereby achieving desirable treatment efficiency.
The use of an anaerobic membrane bioreactor (AnMBR) allows this problem to be solved. The AnMBR can combine anaerobic digestion with a membrane separation technique to intercept microbial aggregates, i.e., sludge, inside the reactor, so that the reactor maintains a relatively high sludge age, thereby improving the efficiency of anaerobic treatment. Compared with the traditional aerobic technology, the AnMBR technology is more likely to become an energy-saving and sustainable-development type new sewage treatment technology. AnMBR is mostly designed as a complete mixing reactor, biomass inside the reactor is in full contact with liquid and a membrane module immersed in mixed liquid, so that the biomass is attached to and grows on the surface of the membrane module, which causes a serious membrane pollution problem.
At present, many countermeasures are provided for the membrane pollution problem at home and abroad, and the method is applied to practice. The current commonly used means is to add a pretreatment structure before the AnMBR, aiming at reducing the concentration of suspended solid flowing into the AnMBR and forming a two-stage anaerobic digestion treatment system, thereby reducing the problem of membrane pollution. The AnMBR is designed into an air-lift type AnMBR, and a biogas circulating device at the bottom of the reactor is used for enabling the disturbance of gas inside the reactor to form a shearing force on the surface of the membrane component, so that the problem of membrane pollution is effectively controlled on the premise of not damaging the membrane component. Similar to the airlift, the addition of granular activated carbon to the pretreatment structure or AnMBR also produces good results and provides a carrier for biomass growth, which allows the anaerobic treatment system to remain relatively stable in the face of widely varying operating conditions such as temperature, load, influent composition, etc.
However, there are some problems in the above-mentioned various countermeasures, such as unsatisfactory energy recovery rate of the two-stage anaerobic digestion system in case of low organic components of the feed water. For airlift anmbrs, the efficiency of treatment of influent suspended solids is highly dependent on relatively high Hydraulic Retention Time (HRT) values when the suspended solids concentration is high, which reduces the operational flexibility of the airlift AnMBR. The problems of filler loss, membrane module damage and the like also exist when granular activated carbon is added into the AnMBR.
Disclosure of Invention
Aiming at the defects in the field, the invention provides a composite anaerobic membrane bioreactor system, integrates the advantages of various AnMBR technologies through skillful design and reasonable process combination, and provides a domestic sewage treatment process which is more stable, efficient, flexible and more economic.
A composite anaerobic membrane bioreactor system comprising:
the fluidized bed anaerobic bioreactor is internally provided with granular activated carbon filler, and the side wall of the fluidized bed anaerobic bioreactor is provided with a water outlet pipe and an air outlet pipe;
the bottom of the airlift anaerobic membrane bioreactor is connected with a water outlet pipe and an air outlet pipe of the fluidized bed anaerobic bioreactor, and the top of the airlift anaerobic membrane bioreactor is provided with an exhaust pipe.
The sewage enters from the bottom of the airlift anaerobic membrane bioreactor after being treated by the fluidized bed anaerobic bioreactor, and is discharged after reaching the standard after being treated by the anaerobic reaction. Biogas generated by anaerobic reaction in the fluidized bed anaerobic bioreactor also enters from the bottom of the airlift anaerobic membrane bioreactor, and during the process that the biogas rises in the airlift anaerobic membrane bioreactor, shearing force is formed on the surface of a membrane component in the airlift anaerobic membrane bioreactor, so that the problem of membrane pollution is effectively controlled on the premise of not damaging the membrane component.
Preferably, the volume filling ratio of the granular activated carbon filler in the fluidized bed anaerobic bioreactor is 20-40%.
The addition of the granular activated carbon filler provides a carrier for the growth of anaerobic microorganisms in the fluidized bed anaerobic bioreactor, and the anaerobic microorganisms are attached to the surface of the granular activated carbon for growth, so that the loss of biomass in the fluidized bed anaerobic bioreactor is reduced, the change of temperature and impact load can be resisted in the anaerobic treatment process, and the adaptability of the anaerobic treatment to the fluctuation of water inlet components can be improved; the HRT is reduced while the treatment effect is increased.
Preferably, the composite anaerobic membrane bioreactor system further comprises a filtering unit for filtering suspended matters in the sewage, and the side wall of the fluidized bed anaerobic bioreactor is further provided with a water inlet pipe for receiving the outlet water of the filtering unit. The sewage enters the fluidized bed anaerobic bioreactor after being filtered by the filtering unit.
Further preferably, the filtering unit comprises a water collecting tank with a grid arranged therein, and the distance between the grids is 1.5-2.5 mm.
Preferably, the fluidized bed anaerobic bioreactor is provided with an internal circulation reflux device, the inlet of the internal circulation reflux device is connected with the side wall of the fluidized bed anaerobic bioreactor, and the outlet of the internal circulation reflux device is connected with the bottom of the fluidized bed anaerobic bioreactor, so that the internal circulation reflux of the sewage of the fluidized bed anaerobic bioreactor is formed, and the loss of the filler is reduced.
Preferably, a sludge discharge pipe is arranged on the side wall of the fluidized bed anaerobic bioreactor and is lower than a water outlet pipe of the fluidized bed anaerobic bioreactor.
Preferably, a return pipe is arranged between the airlift anaerobic membrane bioreactor and the fluidized bed anaerobic bioreactor, so that the return of the sewage in the airlift anaerobic membrane bioreactor to the fluidized bed anaerobic bioreactor is realized.
Preferably, the exhaust pipe of the airlift anaerobic membrane bioreactor is provided with a reflux branch communicated with the exhaust pipe of the fluidized bed anaerobic bioreactor, so that the reflux of the biogas generated in the airlift anaerobic membrane bioreactor to the fluidized bed anaerobic bioreactor can be realized. One part of biogas generated in the airlift type anaerobic membrane bioreactor is directly discharged and collected, the other part of biogas flows back to the fluidized bed anaerobic membrane bioreactor, and the biogas generated by the fluidized bed anaerobic membrane bioreactor enters the airlift type anaerobic membrane bioreactor from the bottom of the airlift type anaerobic membrane bioreactor again, so that the energy recovery rate is improved, and the cleaning effect of the biogas in the airlift type anaerobic membrane bioreactor on membrane components is increased.
Preferably, the top of the inner membrane component of the airlift anaerobic membrane bioreactor is connected with a self-priming pump and is used for pumping and discharging the sewage passing through the membrane component. The self-priming pump generates self-priming force to pump the sewage treated by the membrane module.
Preferably, the membrane component is made of polyolefin materials, and the membrane flux (LMH) is 6-11L m-2h-1。
As a preferred example, the composite anaerobic membrane bioreactor system of the invention comprises:
the filtering unit for filtering suspended matters in sewage comprises a water collecting tank provided with a grid;
the fluidized bed anaerobic bioreactor is internally provided with granular activated carbon filler, and the side wall of the fluidized bed anaerobic bioreactor is provided with a water inlet pipe, a water outlet pipe and a gas outlet pipe; the water inlet pipe is connected with the water outlet of the water collecting tank; the fluidized bed anaerobic bioreactor is provided with an internal circulation reflux device, the inlet of the internal circulation reflux device is connected with the side wall of the fluidized bed anaerobic bioreactor, and the outlet of the internal circulation reflux device is connected with the bottom of the fluidized bed anaerobic bioreactor;
the bottom of the airlift anaerobic membrane bioreactor is connected with the water outlet pipe and the air outlet pipe, and the top of the airlift anaerobic membrane bioreactor is provided with an exhaust pipe; the exhaust pipe is provided with a backflow branch communicated with the exhaust pipe; a return pipe is arranged between the airlift anaerobic membrane bioreactor and the fluidized bed anaerobic bioreactor.
Biogas generated by the fluidized bed anaerobic bioreactor is introduced from the bottom of the airlift anaerobic membrane bioreactor, and the biogas can form shearing force on the surface of the membrane component in the rising process, so that the problem of membrane pollution is effectively controlled on the premise of not damaging the membrane component.
The sewage treatment process based on the composite anaerobic membrane bioreactor system comprises the following steps:
(1) the sewage enters a fluidized bed anaerobic bioreactor after being filtered by a filtering unit, and the operating conditions of the fluidized bed anaerobic bioreactor are as follows: the Hydraulic Retention Time (HRT) is 4-6 h, and the sludge concentration (MLSS) is 6-14 gThe Sludge Retention Time (SRT) is 60-90 days, and the organic load rate is 1.5-2 kg COD m-3d-1The operation temperature is 13-31 ℃, and the internal circulation reflux ratio of the sewage is 140-200%;
(2) the sewage treated by the fluidized bed anaerobic bioreactor enters an air-lift anaerobic membrane bioreactor, and the operating conditions of the air-lift anaerobic membrane bioreactor are as follows: the hydraulic retention time is 7-10 h, the sludge concentration is 4-10 g/L, the sludge retention time is 60-90 days, and the organic load rate is 0.8-1.3 kg COD m-3d-1The operation temperature is 13-31 ℃, the reflux ratio of the sewage from the airlift anaerobic membrane bioreactor to the fluidized bed anaerobic bioreactor is 100-200%, 50-70 vol% of the marsh gas generated by the airlift anaerobic membrane bioreactor flows back to the fluidized bed anaerobic bioreactor, and the rest marsh gas is directly discharged and collected.
Compared with the prior art, the invention has the main advantages that:
(1) by adopting a two-stage anaerobic system, the inlet water sequentially flows through the fluidized bed anaerobic bioreactor and the air-lift type anaerobic membrane bioreactor along the way, so that the difference between the components and the concentration of the substrate in each treatment unit is caused, each treatment unit can culture a microbial community adapted to the treatment unit due to the difference of the inlet substrate, and the HRT in the air-lift type anaerobic membrane bioreactor is obviously shortened due to the fact that the concentration of the substrate is reduced after the treatment of the fluidized bed anaerobic bioreactor, so that the treatment efficiency of the whole process is improved.
(2) The addition of the granular activated carbon provides a carrier for the growth of anaerobic microorganisms in the fluidized bed anaerobic bioreactor, reduces the loss of biomass in the reactor, simultaneously enables the anaerobic treatment process to be more resistant to the change of temperature and impact load, and can also improve the adaptability of the anaerobic treatment to the fluctuation of water inlet components; the HRT is reduced while the treatment effect is increased.
(3) Biogas generated by the fluidized bed anaerobic bioreactor is introduced from the bottom of the airlift anaerobic membrane bioreactor, the shearing force generated by the biogas in the rising process can effectively control the membrane pollution problem, and the service life of the membrane component is prolonged due to less damage to the membrane component, so that the cost is reduced.
(4) By skillfully combining and optimizing the existing anaerobic process, the biomass loss is reduced, the damage of membrane components is reduced, and the treatment efficiency is increased to the greatest extent.
Drawings
FIG. 1 is a schematic view of a composite anaerobic membrane bioreactor system according to an embodiment;
in the figure: 1-a filtration unit; 2-a primary treatment unit; 3-a secondary processing unit; 11-a water collecting tank; 12-grid; 21-a fluidized bed anaerobic bioreactor; 22-a particulate activated carbon filler; 23-internal circulation reflux device; 24-a water outlet pipe; 25-a sludge discharge pipe; 26-an air outlet pipe; 31-airlift anaerobic membrane bioreactor; 32-a membrane module; 33-a drain pipe; 34-a return pipe; 35-an air outlet pipe; 36-air inlet pipe.
Detailed Description
The invention is further described with reference to the following drawings and specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are conducted under conditions not specified, usually according to conventional conditions, or according to conditions recommended by the manufacturer.
Examples
The composite anaerobic membrane bioreactor system of the embodiment is shown in FIG. 1 and comprises a filtering unit 1, a primary treatment unit 2 and a secondary treatment unit 3.
The filtering unit 1 comprises a water collecting tank 11 provided with a grating 12 and used for removing solid floating objects and suspended matters in the sewage to realize the separation of the sewage and solid components. The grid 12 spacing is 2 mm.
The primary treatment unit 2 includes a fluidized bed anaerobic bioreactor 21. The side wall of the fluidized bed anaerobic bioreactor 21 is provided with a water inlet pipe, a water outlet pipe 24 and a gas outlet pipe 26. The water inlet pipe of the fluidized bed anaerobic bioreactor 21 is connected with the water outlet of the water collecting tank 11. The fluidized bed anaerobic bioreactor 21 is internally provided with a granular activated carbon filler 22, and the volume filling ratio is 20-40%. The fluidized bed anaerobic bioreactor 21 is also provided with an internal circulation reflux device 23, the opening on the side wall of the fluidized bed anaerobic bioreactor 21 is used as the inlet of the internal circulation reflux device 23, and the opening on the bottom of the fluidized bed anaerobic bioreactor 21 is used as the outlet of the internal circulation reflux device 23. The side wall of the fluidized bed anaerobic bioreactor 21 is also provided with a sludge discharge pipe 25, and the sludge discharge pipe 25 is lower than the water outlet pipe 24. The top of the fluidized bed anaerobic bioreactor 21 is provided with an air inlet pipe 36.
The secondary treatment unit 3 comprises an airlift anaerobic membrane bioreactor 31. The bottom of the airlift anaerobic membrane bioreactor 31 is connected with a water outlet pipe 24 and an air outlet pipe 26, and the top is provided with an air outlet pipe 35. The exhaust pipe 35 is connected with a first port of a tee joint, a second port of the tee joint is connected with an air inlet pipe 36, and a third port of the tee joint is connected with a biogas collecting device. A return pipe 34 is also arranged between the airlift anaerobic membrane bioreactor 31 and the fluidized bed anaerobic bioreactor 21 to realize the return of the sewage in the airlift anaerobic membrane bioreactor 31 to the fluidized bed anaerobic bioreactor 31. The airlift anaerobic membrane bioreactor 31 is internally provided with a membrane component 32 made of polyethylene materials, the top of the membrane component 32 is connected with a drain pipe 33, and the drain pipe 33 is connected with a self-priming pump and used for pumping and discharging sewage passing through the membrane component 32.
Application example
The process for treating domestic sewage by using the composite anaerobic membrane bioreactor system of the embodiment comprises the following steps:
(1) the sewage is filtered by the filtering unit 1 and then enters the fluidized bed anaerobic bioreactor 21, and the operating conditions of the fluidized bed anaerobic bioreactor 21 are as follows: the Hydraulic Retention Time (HRT) is 4-6 h, the sludge concentration (MLSS) is 6-14 g/L, the Sludge Retention Time (SRT) is 60-90 days, and the organic load rate is 1.5-2 kg COD m-3d-1The operation temperature is 13-31 ℃, and the internal circulation reflux ratio of the sewage is 140-200%;
(2) the sewage treated by the fluidized bed anaerobic bioreactor 21 enters an air-lift anaerobic membrane bioreactor 31, and the operating conditions of the air-lift anaerobic membrane bioreactor 31 are as follows: the hydraulic retention time is 7-10 h, the sludge concentration is 4-10 g/L, the sludge retention time is 60-90 days, and the organic load rate is 0.8-1.3 kg COD m-3d-1The operation temperature is 13-31 ℃, and the sewage flows back to the fluidized bed from the airlift anaerobic membrane bioreactor 31 for anaerobic growthThe reflux ratio of the reactor 21 is 100-200%, 50-70 vol% of the biogas generated by the airlift anaerobic membrane bioreactor 31 flows back to the fluidized bed anaerobic bioreactor 21, and the rest biogas is directly discharged and collected.
The biogas which flows back to the fluidized bed anaerobic bioreactor 21 carries the biogas generated by the fluidized bed anaerobic bioreactor 21 to enter the airlift anaerobic membrane bioreactor 31 from the bottom of the airlift anaerobic membrane bioreactor 31 again, and the biogas can form shearing force on the surface of the membrane component 32 in the rising process, so that the membrane pollution problem is effectively controlled on the premise of not damaging the membrane component 32.
The domestic sewage treated by the composite anaerobic membrane bioreactor system of the embodiment has a COD volume load of 1.3-1.4 kg COD m-3d-1In the process, the removal rate of COD can reach 90 percent. Compared with the traditional AnMBR process, the HRT of the process can be reduced by 40-50%, and the recovery utilization rate of the methane can be improved by 10-20%. In addition, the filler loss and the membrane module pollution are superior to those of the traditional process.
Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the above description of the present invention, and equivalents also fall within the scope of the invention as defined by the appended claims.
Claims (10)
1. A composite anaerobic membrane bioreactor system, comprising:
the fluidized bed anaerobic bioreactor is internally provided with granular activated carbon filler, and the side wall of the fluidized bed anaerobic bioreactor is provided with a water outlet pipe and an air outlet pipe;
the bottom of the airlift anaerobic membrane bioreactor is connected with a water outlet pipe and an air outlet pipe of the fluidized bed anaerobic bioreactor, and the top of the airlift anaerobic membrane bioreactor is provided with an exhaust pipe.
2. The composite anaerobic membrane bioreactor system according to claim 1, further comprising a filtering unit for filtering suspended matters in the sewage, wherein the sidewall of the fluidized bed anaerobic bioreactor is further provided with a water inlet pipe for receiving the outlet water of the filtering unit.
3. The composite anaerobic membrane bioreactor system of claim 2, wherein the filtration unit comprises a water collecting tank with internal grids, and the distance between the grids is 1.5-2.5 mm.
4. The composite anaerobic membrane bioreactor system according to claim 1, wherein the fluidized bed anaerobic bioreactor is provided with an internal circulation reflux device, the inlet of the internal circulation reflux device is connected with the side wall of the fluidized bed anaerobic bioreactor, and the outlet of the internal circulation reflux device is connected with the bottom of the fluidized bed anaerobic bioreactor.
5. The composite anaerobic membrane bioreactor system of claim 1, wherein a sludge discharge pipe is further arranged on the side wall of the fluidized bed anaerobic bioreactor, and the sludge discharge pipe is lower than the water outlet pipe of the fluidized bed anaerobic bioreactor.
6. The composite anaerobic membrane bioreactor system as claimed in claim 1, wherein a return pipe is arranged between the airlift anaerobic membrane bioreactor and the fluidized bed anaerobic bioreactor.
7. The composite anaerobic membrane bioreactor system as claimed in claim 1, wherein the exhaust pipe of the airlift anaerobic membrane bioreactor is provided with a return branch communicated with the outlet pipe of the fluidized bed anaerobic bioreactor.
8. The composite anaerobic membrane bioreactor system of claim 1, wherein the top of the inner membrane module of the airlift anaerobic membrane bioreactor is connected with a self-priming pump for pumping and discharging the sewage passing through the membrane module.
9. The composite anaerobic membrane bioreactor system according to any one of claims 1 to 8, comprising:
the filtering unit for filtering suspended matters in sewage comprises a water collecting tank provided with a grid;
the fluidized bed anaerobic bioreactor is internally provided with granular activated carbon filler, and the side wall of the fluidized bed anaerobic bioreactor is provided with a water inlet pipe, a water outlet pipe and a gas outlet pipe; the water inlet pipe is connected with the water outlet of the water collecting tank; the fluidized bed anaerobic bioreactor is provided with an internal circulation reflux device, the inlet of the internal circulation reflux device is connected with the side wall of the fluidized bed anaerobic bioreactor, and the outlet of the internal circulation reflux device is connected with the bottom of the fluidized bed anaerobic bioreactor;
the bottom of the airlift anaerobic membrane bioreactor is connected with the water outlet pipe and the air outlet pipe, and the top of the airlift anaerobic membrane bioreactor is provided with an exhaust pipe; the exhaust pipe is provided with a backflow branch communicated with the exhaust pipe; a return pipe is arranged between the airlift anaerobic membrane bioreactor and the fluidized bed anaerobic bioreactor.
10. A sewage treatment process based on the composite anaerobic membrane bioreactor system of claim 9, comprising the steps of:
(1) the sewage enters a fluidized bed anaerobic bioreactor after being filtered by a filtering unit, and the operating conditions of the fluidized bed anaerobic bioreactor are as follows: the hydraulic retention time is 4-6 h, the sludge concentration is 6-14 g/L, the sludge retention time is 60-90 days, and the organic load rate is 1.5-2 kg COD m-3d-1The operation temperature is 13-31 ℃, and the internal circulation reflux ratio of the sewage is 140-200%;
(2) the sewage treated by the fluidized bed anaerobic bioreactor enters an air-lift anaerobic membrane bioreactor, and the operating conditions of the air-lift anaerobic membrane bioreactor are as follows: the hydraulic retention time is 7-10 h, the sludge concentration is 4-10 g/L, the sludge retention time is 60-90 days, and the organic load rate is 0.8-1.3 kg COD m-3d-1The operation temperature is 13-31 ℃, the reflux ratio of the sewage from the airlift anaerobic membrane bioreactor to the fluidized bed anaerobic bioreactor is 100-200%, 50-70 vol% of the marsh gas generated by the airlift anaerobic membrane bioreactor flows back to the fluidized bed anaerobic bioreactor, and the rest marsh gas is directly discharged and collected.
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| CN107129036A (en) * | 2017-05-12 | 2017-09-05 | 天津中冀源环保科技有限公司 | Improve the method that anaerobic bio-treated produces high-purity methane |
| CN209039272U (en) * | 2018-08-06 | 2019-06-28 | 清华大学 | Sewage-treatment plant |
| CN211595172U (en) * | 2019-12-11 | 2020-09-29 | 杭州师范大学 | Composite anaerobic membrane bioreactor system |
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