Efficient anaerobic membrane bioreactor treatment system and process for treating aquaculture wastewater

Abstract

The invention discloses an efficient anaerobic membrane bioreactor treatment system and process for treating aquaculture wastewater. The system comprises a regulating tank, an up-flow anaerobic sludge blanket connected with the regulating tank, a membrane tank and a biogas utilization system which are connected with the up-flow anaerobic sludge blanket, a sludge treatment system, and a water producing tank connected with the membrane tank which are connected in sequence, the up-flow anaerobic sludge bed and the membrane tank are connected with the sludge treatment system; a hollow fiber membrane assembly is arranged in the membrane tank. By optimizing the process route and equipment configuration, the problems of membrane pollution, high energy consumption, difficulty in maintaining sludge activity, low biogas utilization efficiency and system safety in the prior art are solved, and the system has the advantages of high-efficiency treatment, energy conservation, consumption reduction, stable system, safety, reliability, remarkable economic benefit and the like, and is suitable for treating breeding wastewater of various scales.

Description

Technical Field

[0001] The invention relates to the field of wastewater treatment, and in particular to a high-efficiency anaerobic membrane bioreactor treatment system and process for treating aquaculture wastewater. Background Art

[0002] In the field of aquaculture wastewater treatment, traditional treatment processes mainly include physical treatment (such as sedimentation, filtration), chemical treatment (such as flocculation, oxidation) and biological treatment (such as aerobic activated sludge method, anaerobic digestion). In recent years, with the improvement of environmental protection requirements and technological progress, anaerobic membrane bioreactor (AnMBR) technology has gradually become one of the mainstream technologies for treating high-concentration organic wastewater (such as aquaculture wastewater). Anaerobic MBR technology combines the advantages of anaerobic biological treatment and membrane separation technology, and can efficiently remove organic matter, nitrogen, phosphorus and other pollutants in wastewater, while generating biogas for energy recovery.

[0003] At present, a variety of anaerobic MBR systems have been applied to aquaculture wastewater treatment at home and abroad, among which the more typical technologies include:

[0004] UASB+Aerobic MBR System: The wastewater first enters the upflow anaerobic sludge blanket (UASB) for anaerobic treatment, and then enters the aerobic membrane bioreactor (MBR) for further aerobic treatment. This system can effectively remove organic matter and nitrogen and phosphorus, but it has problems such as high energy consumption, additional oxygen supply in the aerobic stage, and large floor space.

[0005] IC (internal circulation anaerobic reactor) + MBR system: wastewater enters the internal circulation anaerobic reactor (IC) for anaerobic treatment, and then enters the membrane tank for membrane separation. This system has a high organic load and treatment efficiency, but the structure of the IC reactor is complex, the operation and maintenance are difficult, and the membrane pollution problem has not been effectively solved.

[0006] Integrated anaerobic MBR system: The anaerobic reactor and membrane tank are integrated into one system, and the wastewater directly enters the anaerobic membrane bioreactor for treatment. The system has a compact structure and occupies a small area, but the system is only suitable for small-volume wastewater treatment systems.

[0007] Therefore, it is necessary to improve the existing technology to provide a more reliable solution. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a high-efficiency anaerobic membrane bioreactor treatment system and process for treating aquaculture wastewater in view of the deficiencies in the above-mentioned prior art.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: In the first aspect of the present invention, a high-efficiency anaerobic membrane bioreactor treatment system for treating aquaculture wastewater is provided, comprising a regulating tank connected in sequence, an upflow anaerobic sludge bed connected to the regulating tank, a membrane tank and a biogas utilization system connected to the upflow anaerobic sludge bed, a sludge treatment system, and a water production tank connected to the membrane tank;

[0010] The upflow anaerobic sludge bed and the membrane tank are both connected to the sludge treatment system;

[0011] A hollow fiber membrane component is arranged inside the membrane pool.

[0012] Preferably, the regulating tank is connected to the upflow anaerobic sludge bed via a water inlet pipe, the end of the water inlet pipe extends into the bottom of the upflow anaerobic sludge bed, and an anaerobic water inlet pump is provided on the water inlet pipe.

[0013] Preferably, the upflow anaerobic sludge blanket is connected to the membrane tank via an overflow pipe.

[0014] Preferably, the membrane pool is connected to the water production pool via a water production pipe, and a water production pump is provided on the water production pipe.

[0015] Preferably, a circulating water pipe is connected to the upper part of the upflow anaerobic sludge bed, the end of the circulating water pipe extends into the bottom of the upflow anaerobic sludge bed, and an anaerobic circulating pump is provided on the circulating water pipe.

[0016] Preferably, the bottom of the upflow anaerobic sludge bed and the membrane tank are respectively connected to a first sludge discharge pipe and a second sludge discharge pipe, the ends of the first sludge discharge pipe and the second sludge discharge pipe are connected in parallel to a sludge discharge main pipe, and a sludge pump is provided on the sludge discharge main pipe.

[0017] Preferably, the sludge discharge main pipe is also connected to a sludge return pipe, and the end of the sludge return pipe is connected to the circulating water pipe.

[0018] Preferably, the upflow anaerobic sludge bed is connected with a biogas discharge pipe, the end of the biogas discharge pipe is connected with a water seal barrel, the outlet end of the water seal barrel is connected with a biogas delivery pipe, and the end of the biogas delivery pipe is connected to a biogas utilization system;

[0019] The biogas delivery pipe is also provided with a biogas flushing pipe, the end of which is connected to the inside of the membrane pool to output biogas to flush the hollow fiber membrane components in the membrane pool.

[0020] In a second aspect of the present invention, a high-efficiency anaerobic membrane bioreactor treatment process for treating aquaculture wastewater is provided, which uses the system as described above to treat aquaculture wastewater, and the process comprises the following steps:

[0021] S1. Aquaculture wastewater enters the regulating pond for water quality and quantity regulation;

[0022] S2. The effluent from the regulating tank enters the upflow anaerobic sludge bed through the water inlet pipe for anaerobic treatment. The anaerobic microorganisms in the upflow anaerobic sludge bed convert the organic matter in the aquaculture wastewater into biogas;

[0023] Part of the wastewater on the upper part of the upflow anaerobic sludge bed is drawn out through the circulating water pipe and then circulated to the bottom of the upflow anaerobic sludge bed;

[0024] S3, the overflow of the upflow anaerobic sludge bed enters the membrane pool, the hollow fiber membrane module in the membrane pool intercepts the microorganisms and suspended solids in the wastewater through membrane separation, and the effluent of the membrane pool enters the water production pool through the water production pipe;

[0025] S4. The sludge at the bottom of the upflow anaerobic sludge bed and the sludge at the bottom of the membrane tank are respectively drawn out through the first sludge discharge pipe and the second sludge discharge pipe, and converge into the sludge discharge main pipe. Part of the sludge is transported to the circulating water pipe through the sludge return pipe, and is transported to the bottom of the upflow anaerobic sludge bed together with the circulating wastewater in the circulating water pipe. The rest of the sludge enters the sludge treatment system.

[0026] S5. The biogas generated in the upflow anaerobic sludge bed enters the biogas delivery pipe after passing through the biogas discharge pipe and the water seal barrel. Part of the biogas is transported to the inside of the membrane pool through the biogas flushing pipe to flush the hollow fiber membrane components in the membrane pool. The rest of the biogas is transported to the biogas utilization system through the biogas delivery pipe.

[0027] Preferably, the residence time of the aquaculture wastewater in the regulating tank is 6-12 hours; the residence time of the aquaculture wastewater in the upflow anaerobic sludge bed is 8-12 hours;

[0028] In step S4, the proportion of the sludge returned to the upflow anaerobic sludge bed accounts for 10%-30% of the total sludge mass.

[0029] The beneficial effects of the present invention are:

[0030] The present invention provides a high-efficiency anaerobic membrane bioreactor treatment system and process for treating aquaculture wastewater, which has at least the following advantages:

[0031] Efficient treatment: Through the combination of anaerobic treatment and membrane separation technology, organic matter and pollutants such as nitrogen and phosphorus in wastewater can be efficiently removed to ensure that the effluent quality meets the discharge standards.

[0032] Energy saving and consumption reduction: Utilize biogas to flush the membrane fibers and recycle biogas energy to reduce the overall energy consumption of the system and reduce the consumption of external energy.

[0033] System stability: Through the design of sludge return and shared sludge pump, the activity of sludge is maintained, ensuring the stable operation of the system and reducing sludge loss.

[0034] Safe and reliable: All electrical equipment is explosion-proof to ensure safe operation of the system in a biogas environment and avoid potential safety hazards.

[0035] Economic benefits: Simplified system structure and energy recycling reduce equipment investment and operating costs, and have good economic benefits.

[0036] Wide scope of application: The high-efficiency anaerobic MBR treatment system of the present invention is suitable for wastewater treatment in farms of various sizes. The system can be flexibly adjusted according to the wastewater quality and water volume of different farms and has wide applicability.

[0037] The present invention solves the problems of membrane pollution, high energy consumption, difficulty in maintaining sludge activity, low biogas utilization efficiency and system safety in the prior art by optimizing the process route and equipment configuration. It has the advantages of efficient treatment, energy saving and consumption reduction, system stability, safety and reliability, and significant economic benefits, and is suitable for aquaculture wastewater treatment of various scales. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic structural diagram of a high-efficiency anaerobic membrane bioreactor treatment system for treating aquaculture wastewater according to the present invention.

[0039] Description of reference numerals:

[0040] 1—regulating tank; 2—upflow anaerobic sludge blanket; 3—membrane tank; 4—biogas utilization system; 5—sludge treatment system; 6—water production tank;

[0041] 11—water inlet pipe; 12—anaerobic water inlet pump;

[0042] 21-overflow pipe; 22-circulating water pipe; 23-anaerobic circulation pump; 24-first sludge discharge pipe; 25-biogas discharge pipe; 26-water seal barrel; 27-biogas delivery pipe; 28-biogas flushing pipe;

[0043] 31—hollow fiber membrane module; 32—water production pipe; 33—water production pump; 34—second sludge discharge pipe; 35—sludge discharge main pipe; 36—sludge pump; 37—sludge return pipe. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0045] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0046] The test methods used in the following examples are conventional methods unless otherwise specified. The materials and reagents used in the following examples are all commercially available unless otherwise specified. In the following examples, if no specific conditions are specified, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0047] The present invention provides a high-efficiency anaerobic membrane bioreactor treatment system for treating aquaculture wastewater, comprising a regulating tank 1, an upflow anaerobic sludge blanket 2 connected to the regulating tank 1, a membrane tank 3 and a biogas utilization system 4 connected to the upflow anaerobic sludge blanket 2, a sludge treatment system 5, and a water production tank 6 connected to the membrane tank 3, which are connected in sequence;

[0048] The upflow anaerobic sludge blanket 2 and the membrane tank 3 are both connected to the sludge treatment system 5;

[0049] A hollow fiber membrane module 31 is arranged inside the membrane pool 3 .

[0050] The regulating tank 1 is connected to the upflow anaerobic sludge blanket 2 through an inlet pipe 11 , the end of the inlet pipe 11 extends to the bottom of the upflow anaerobic sludge blanket 2 , and an anaerobic inlet pump 12 is provided on the inlet pipe 11 .

[0051] The upflow anaerobic sludge blanket 2 is connected to the membrane pool 3 via an overflow pipe 21 .

[0052] The membrane pool 3 is connected to the water production pool 6 via a water production pipe 32 , and a water production pump 33 is provided on the water production pipe 32 .

[0053] The upper part of the upflow anaerobic sludge blanket 2 is connected with a circulating water pipe 22 , the end of the circulating water pipe 22 extends to the bottom of the upflow anaerobic sludge blanket 2 , and an anaerobic circulating pump 23 is arranged on the circulating water pipe 22 .

[0054] The bottom of the upflow anaerobic sludge bed 2 and the membrane pool 3 are respectively connected with a first sludge discharge pipe 24 and a second sludge discharge pipe 34 , the ends of which are connected in parallel to a sludge discharge main pipe 35 , on which a sludge pump 36 is provided.

[0055] The sludge discharge main pipe 35 is also connected to a sludge return pipe 37 , and the end of the sludge return pipe 37 is connected to the circulating water pipe 22 .

[0056] The upflow anaerobic sludge bed 2 is connected with a biogas discharge pipe 25, the end of which is connected with a water seal barrel 26, the outlet end of which is connected with a biogas delivery pipe 27, the end of which is connected to a biogas utilization system 4;

[0057] A biogas flushing pipe 28 is also provided on the biogas delivery pipe 27 , and the end of the biogas flushing pipe 28 is connected to the inside of the membrane pool 3 for outputting biogas to flush the hollow fiber membrane assembly 31 in the membrane pool 3 .

[0058] In the present invention, the regulating tank 1 is used to store and homogenize aquaculture wastewater, regulate water quality and water quantity, and ensure the stable operation of the subsequent treatment system. The anaerobic water inlet pump 12: lifts the wastewater in the regulating tank 1 to the UASB anaerobic system to ensure that the wastewater can smoothly enter the anaerobic treatment stage.

[0059] In the present invention, the upflow anaerobic sludge blanket 2 (UASB) adopts the upflow anaerobic sludge blanket 2 technology to convert organic matter in wastewater into biogas through the action of anaerobic microorganisms.

[0060] In the present invention, the membrane pool 3 is connected to the UASB anaerobic system, and the wastewater after anaerobically treated overflows to the membrane pool 3. A hollow fiber membrane assembly 31 is arranged in the membrane pool 3, and the microorganisms and suspended solids in the wastewater are intercepted by membrane separation technology to ensure that the effluent water quality meets the discharge standard.

[0061] In the present invention, part of the biogas generated by the UASB anaerobic system enters the membrane pool 3 to effectively flush the membrane fibers, reduce membrane pollution, and extend the service life of the membrane. The remaining biogas enters the biogas utilization system 4 to generate electricity or as fuel, realizing the recycling of energy.

[0062] In the present invention, the UASB anaerobic system and the membrane tank 3 share a sludge pump 36, which discharges sludge regularly according to the sludge condition, and part of the sludge flows back to the anaerobic system to maintain the activity of the sludge and ensure the stable operation of the system.

[0063] In the present invention, all electrical equipment of the anaerobic system and the membrane pool 3 system are explosion-proofed to ensure safe operation of the system in a biogas environment.

[0064] The present invention also provides a high-efficiency anaerobic membrane bioreactor treatment process for treating aquaculture wastewater, which uses the above system to treat aquaculture wastewater, and the process includes the following steps:

[0065] S1, aquaculture wastewater enters regulating tank 1 for water quality and water quantity regulation to ensure the stability of wastewater quality and water quantity;

[0066] S2, the effluent from the regulating tank 1 enters the upflow anaerobic sludge bed 2 through the water inlet pipe 11 for anaerobic treatment, and the anaerobic microorganisms in the upflow anaerobic sludge bed 2 convert the organic matter in the aquaculture wastewater into biogas;

[0067] Part of the wastewater at the upper part of the upflow anaerobic sludge blanket 2 is drawn out through the circulating water pipe 22 and then circulated to the bottom of the upflow anaerobic sludge blanket 2;

[0068] S3, the overflow of the upflow anaerobic sludge bed 2 enters the membrane pool 3, the hollow fiber membrane module 31 in the membrane pool 3 intercepts the microorganisms and suspended solids in the wastewater through the membrane separation technology to ensure that the effluent water quality meets the discharge standard, and the effluent of the membrane pool 3 enters the water production pool 6 through the water production pipe 32;

[0069] S4, the sludge at the bottom of the upflow anaerobic sludge blanket 2 and the sludge at the bottom of the membrane tank 3 are respectively extracted through the first sludge discharge pipe 24 and the second sludge discharge pipe 34, and converge into the sludge discharge main pipe 35, part of which is transported to the circulating water pipe 22 through the sludge return pipe 37, and is transported to the bottom of the upflow anaerobic sludge blanket 2 together with the circulating wastewater in the circulating water pipe 22, and the rest of the sludge enters the sludge treatment system 5;

[0070] S5. The biogas generated in the upflow anaerobic sludge bed 2 enters the biogas delivery pipe 27 after passing through the biogas discharge pipe 25 and the water seal barrel 26. Part of the biogas is delivered to the inside of the membrane pool 3 through the biogas flushing pipe 28 to flush the hollow fiber membrane assembly 31 in the membrane pool 3, thereby reducing membrane pollution and extending the service life of the membrane; the remaining part of the biogas is delivered to the biogas utilization system 4 through the biogas delivery pipe 27 to be used for power generation or as fuel to achieve energy recycling.

[0071] In a preferred embodiment, the residence time of the aquaculture wastewater in the regulating tank 1 is designed according to the average daily discharge of the aquaculture wastewater, which is usually 6-12 hours.

[0072] The retention time of the aquaculture wastewater in the upflow anaerobic sludge blanket 2 is designed according to the water quality and treatment requirements of the wastewater, and is usually 8-12 hours.

[0073] The membrane flux of membrane pool 3 is usually 10-20L / m, which is selected according to the wastewater quality and treatment requirements. 2 ·h.

[0074] The frequency of biogas flushing is adjusted in real time according to the degree of membrane fouling, usually once every 4-6 hours.

[0075] In step S4, the proportion of the sludge returned to the upflow anaerobic sludge blanket 2 to the total sludge mass is adjusted in real time according to the sludge concentration and activity, and is usually 10%-30%.

[0076] In view of the many problems existing in the prior art, the present invention conducts an in-depth analysis of the causes thereof and solves these problems well through the improvement of the solutions, as described below.

[0077] 1. Serious membrane fouling problem

[0078] Problem description: In the existing anaerobic MBR system, membrane fouling is one of the main problems that affect the stable operation of the system. Due to the high concentration of organic matter in the wastewater during the anaerobic treatment process, and the easy deposition of anaerobic microbial metabolites (such as extracellular polymers EPS) on the membrane surface, the membrane flux decreases, affecting the treatment efficiency of the system.

[0079] Cause analysis: In the existing technology, the control of membrane pollution mainly relies on physical cleaning (such as hydraulic flushing) and chemical cleaning (such as sodium hypochlorite cleaning), but these methods have problems such as high cleaning frequency, high energy consumption, and damage to the membrane by chemical agents, and cannot fundamentally solve the problem of membrane pollution.

[0080] The technical problem solved by the present invention is to reduce membrane pollution, extend the service life of the membrane and reduce energy consumption by flushing the membrane fibers with the biogas generated by the anaerobic system.

[0081] 2. High energy consumption

[0082] Problem description: Existing anaerobic MBR systems usually require additional aeration equipment (such as aerobic MBR stage) or complex internal circulation systems (such as IC reactors), resulting in high energy consumption of the system. In addition, the operation of the membrane module requires continuous suction force, which further increases the energy consumption of the system.

[0083] Cause analysis: In the existing technology, the utilization efficiency of biogas is low and cannot completely offset the energy consumption of the system. In addition, the operation of the membrane module requires continuous suction force, which further increases the energy consumption of the system.

[0084] The technical problem solved by the present invention is to reduce the overall energy consumption of the system and the consumption of external energy by flushing the membrane fibers with biogas and recycling the biogas energy.

[0085] 3. Difficulty in maintaining sludge activity

[0086] Problem description: During the anaerobic treatment process, the activity of sludge is crucial to the treatment efficiency of the system. In the existing anaerobic MBR system, sludge loss and aging are common problems, resulting in decreased sludge activity and reduced treatment efficiency.

[0087] Cause analysis: Although the existing sludge return measures can alleviate this problem to a certain extent, the optimization of the return ratio and return method still needs further research. In addition, the growth rate of anaerobic microorganisms is slow, and it is difficult to restore the activity of sludge.

[0088] The technical problem solved by the present invention is: by sharing a sludge discharge pump and returning part of the sludge to the anaerobic system, the activity of the sludge is maintained, the stable operation of the system is ensured, and the loss of sludge is reduced.

[0089] 5. System security issues

[0090] Problem description: A large amount of biogas is produced during the anaerobic treatment process. The main component of biogas is methane, which is flammable and explosive. In the existing anaerobic MBR system, some equipment (such as motors, pumps, etc.) have not been explosion-proofed, posing a safety hazard.

[0091] Cause analysis: In the existing system, the collection and storage system of biogas is not designed properly, which may lead to biogas leakage, increase the risk of environmental pollution and safety accidents. In addition, some electrical equipment has not been explosion-proofed, posing a safety hazard.

[0092] The technical problem solved by the present invention is that all electrical equipment are explosion-proofed to ensure safe operation of the system in a biogas environment and avoid potential safety hazards.

[0093] 6. Poor system operation stability

[0094] Problem description: During the operation of the existing anaerobic MBR system, due to problems such as membrane fouling and decreased sludge activity, the system's operating stability is poor and the treatment effect fluctuates greatly.

[0095] The technical problem solved by the present invention is to improve the operational stability of the system and ensure the stability and efficiency of the treatment effect by means of biogas flushing membrane fibers (i.e., membrane fibers in the hollow fiber membrane assembly 31) and sludge reflux to maintain activity.

[0096] 7. High operation and maintenance costs

[0097] Problem description: The operation and maintenance costs of existing anaerobic MBR systems are relatively high, mainly reflected in the high frequency of membrane cleaning, high sludge treatment costs, and low biogas utilization efficiency.

[0098] Cause analysis: In the existing system, membrane pollution is serious, resulting in high frequency of membrane cleaning; sludge loss and aging problems lead to high sludge treatment costs; low biogas utilization efficiency leads to low energy recovery benefits.

[0099] The technical problem solved by the present invention is to reduce the operation and maintenance cost of the system through technical means such as biogas flushing membrane fibers, sludge reflow to maintain activity, and biogas energy recycling.

[0100] The present invention has at least the following technical improvements:

[0101] (1) Biogas flushing membrane fibers

[0102] Technical description: The biogas generated by the UASB anaerobic system is transported to the membrane pool 3 through a pipeline, and the biogas airflow is used to flush the membrane fibers, reducing the deposition of pollutants on the membrane surface and extending the service life of the membrane.

[0103] Technical advantages: Biogas flushing not only reduces membrane pollution, but also reduces the energy consumption of the system, while achieving effective utilization of biogas.

[0104] (2) Shared sludge pump

[0105] Technical description: The UASB anaerobic system and membrane tank 3 share a sludge pump, which discharges sludge regularly according to the sludge condition, and part of the sludge flows back to the anaerobic system to maintain the activity of the sludge.

[0106] Technical advantages: The shared sludge pump simplifies the system structure, reduces equipment investment and operating costs, while ensuring the activity of sludge and improving the system's processing efficiency.

[0107] (3) Sludge return to maintain activity

[0108] Technical description: Part of the sludge is returned to the UASB anaerobic system through the sludge pump to maintain the activity of anaerobic microorganisms and ensure the stable operation of the system.

[0109] Technical advantages: Sludge return can effectively maintain the activity of anaerobic microorganisms, reduce sludge loss, and improve the treatment efficiency of the system.

[0110] (4) Explosion-proof design

[0111] Technical description: All electrical equipment in the anaerobic system and membrane tank 3 system are explosion-proof to ensure safe operation of the system in a biogas environment.

[0112] Technical advantages: The explosion-proof design improves the safety of the system, avoids the risk of biogas leakage and explosion, and ensures the long-term stable operation of the system.

[0113] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to specific details.

Claims

1. A high-efficiency anaerobic membrane bioreactor treatment system for treating aquaculture wastewater, characterized in that: It includes a regulating tank connected in sequence, an upflow anaerobic sludge bed connected to the regulating tank, a membrane tank and a biogas utilization system connected to the upflow anaerobic sludge bed, a sludge treatment system, and a water production tank connected to the membrane tank; The upflow anaerobic sludge bed and the membrane tank are both connected to the sludge treatment system; A hollow fiber membrane component is arranged inside the membrane pool.

2. The high-efficiency anaerobic membrane bioreactor treatment system for treating aquaculture wastewater according to claim 1, characterized in that: The regulating tank is connected to the upflow anaerobic sludge bed through a water inlet pipe, the end of the water inlet pipe extends into the bottom of the upflow anaerobic sludge bed, and an anaerobic water inlet pump is arranged on the water inlet pipe.

3. The high-efficiency anaerobic membrane bioreactor treatment system for treating aquaculture wastewater according to claim 2, characterized in that: The upflow anaerobic sludge bed is connected to the membrane tank through an overflow pipe.

4. The high-efficiency anaerobic membrane bioreactor treatment system for treating aquaculture wastewater according to claim 3, characterized in that: The membrane pool is connected to the water production pool through a water production pipe, and a water production pump is arranged on the water production pipe.

5. The high-efficiency anaerobic membrane bioreactor treatment system for treating aquaculture wastewater according to claim 4, characterized in that: The upper part of the upflow anaerobic sludge bed is connected with a circulating water pipe, the end of the circulating water pipe extends into the bottom of the upflow anaerobic sludge bed, and an anaerobic circulating pump is arranged on the circulating water pipe.

6. The high-efficiency anaerobic membrane bioreactor treatment system for treating aquaculture wastewater according to claim 5, characterized in that: The bottoms of the upflow anaerobic sludge bed and the membrane pool are respectively connected with a first sludge discharge pipe and a second sludge discharge pipe, the ends of the first sludge discharge pipe and the second sludge discharge pipe are connected in parallel to a sludge discharge main pipe, and a sludge pump is arranged on the sludge discharge main pipe.

7. The high-efficiency anaerobic membrane bioreactor treatment system for treating aquaculture wastewater according to claim 6, characterized in that: The sludge discharge main pipe is also connected to a sludge return pipe, and the end of the sludge return pipe is connected to the circulating water pipe.

8. The high-efficiency anaerobic membrane bioreactor treatment system for treating aquaculture wastewater according to claim 7, characterized in that: The upflow anaerobic sludge bed is connected with a biogas discharge pipe, the end of the biogas discharge pipe is connected with a water seal barrel, the outlet end of the water seal barrel is connected with a biogas delivery pipe, and the end of the biogas delivery pipe is connected to a biogas utilization system; The biogas delivery pipe is also provided with a biogas flushing pipe, the end of which is connected to the inside of the membrane pool to output biogas to flush the hollow fiber membrane components in the membrane pool.

9. A high-efficiency anaerobic membrane bioreactor treatment process for treating aquaculture wastewater, which uses the system as described in any one of claims 1 to 8 to treat aquaculture wastewater, and the process comprises the following steps: S1. Aquaculture wastewater enters the regulating pond for water quality and quantity regulation; S2. The effluent from the regulating tank enters the upflow anaerobic sludge bed through the water inlet pipe for anaerobic treatment. The anaerobic microorganisms in the upflow anaerobic sludge bed convert the organic matter in the aquaculture wastewater into biogas; Part of the wastewater on the upper part of the upflow anaerobic sludge bed is drawn out through the circulating water pipe and then circulated to the bottom of the upflow anaerobic sludge bed; S3, the overflow of the upflow anaerobic sludge bed enters the membrane pool, the hollow fiber membrane module in the membrane pool intercepts the microorganisms and suspended solids in the wastewater through membrane separation, and the effluent of the membrane pool enters the water production pool through the water production pipe; S4. The sludge at the bottom of the upflow anaerobic sludge bed and the sludge at the bottom of the membrane tank are respectively drawn out through the first sludge discharge pipe and the second sludge discharge pipe, and converge into the sludge discharge main pipe. Part of the sludge is transported to the circulating water pipe through the sludge return pipe, and is transported to the bottom of the upflow anaerobic sludge bed together with the circulating wastewater in the circulating water pipe. The rest of the sludge enters the sludge treatment system. S5. The biogas generated in the upflow anaerobic sludge bed enters the biogas delivery pipe after passing through the biogas discharge pipe and the water seal barrel. Part of the biogas is transported to the inside of the membrane pool through the biogas flushing pipe to flush the hollow fiber membrane components in the membrane pool. The rest of the biogas is transported to the biogas utilization system through the biogas delivery pipe.

10. The high-efficiency anaerobic membrane bioreactor treatment process for treating aquaculture wastewater according to claim 9, characterized in that: The retention time of aquaculture wastewater in the regulating tank is 6-12 hours; the retention time of aquaculture wastewater in the upflow anaerobic sludge bed is 8-12 hours; In step S4, the proportion of the sludge returned to the upflow anaerobic sludge bed accounts for 10%-30% of the total sludge mass.

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