CN112194250A - System and method for recycling biogas energy in organic wastewater anaerobic membrane biological treatment - Google Patents

System and method for recycling biogas energy in organic wastewater anaerobic membrane biological treatment Download PDF

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Publication number
CN112194250A
CN112194250A CN202011235427.1A CN202011235427A CN112194250A CN 112194250 A CN112194250 A CN 112194250A CN 202011235427 A CN202011235427 A CN 202011235427A CN 112194250 A CN112194250 A CN 112194250A
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gas
pipeline
anaerobic membrane
anaerobic
organic wastewater
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张新波
张程阳
曹晓畅
王晓
张建清
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Tg Hilyte Environmental Technology Beijing Co ltd
Tianjin Chengjian University
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Tg Hilyte Environmental Technology Beijing Co ltd
Tianjin Chengjian University
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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
    • C02F3/2853—Anaerobic digestion processes using anaerobic membrane bioreactors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
    • 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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2866—Particular arrangements for anaerobic reactors
    • C02F3/2893—Particular arrangements for anaerobic reactors with biogas recycling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/24—Hydrocarbons
    • B01D2256/245—Methane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • 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
    • C02F2303/00—Specific treatment goals
    • C02F2303/10—Energy recovery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Organic Chemistry (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
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  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention provides a system and a method for recovering biogas energy in organic wastewater anaerobic membrane biological treatment, which are used for solving the problem of CH generated in organic wastewater anaerobic membrane biological treatment4Low purity, high recovery difficulty, easy environmental pollution and resource waste. The hollow fiber membrane component in the anaerobic membrane bioreactor in the system can realize solid-liquid separation, a sedimentation tank is not needed, and the effluent can reach the discharge standard; pumping the effluent of the anaerobic membrane bioreactor into a gas-liquid separation device for high-efficiency gas-liquid separation; by CH4/CO2The gas separation membrane pumps CH in the mixed gas4And CO2Effective separation is carried out. The invention canHigh-concentration organic wastewater is efficiently treated, the effluent quality is ensured to reach the discharge standard, and CH generated in the anaerobic wastewater treatment can be efficiently recovered4，CH4High recovery rate of (C), final recovered CH4The purity of the product can reach 90%, and the effects of environmental protection and energy recycling are achieved.

Description

System and method for recycling biogas energy in organic wastewater anaerobic membrane biological treatment
Technical Field
The invention belongs to the field of wastewater treatment technology and energy recovery, and particularly relates to a system and a method for recovering biogas energy in organic wastewater anaerobic membrane biological treatment.
Background
In recent years, the total amount of domestic sewage and industrial wastewater in China is increasing, and the unit pollution load is getting larger and larger. Further, with the rapid increase in the total energy consumption, fossil energy of coal and petroleum is becoming exhausted, and CH is compared with petroleum and coal4Has the advantages of high calorific value and cleanness, and is considered as an ideal substitute resource for coal and petroleum. Serious water pollution and energy shortage, and urgent need for new effective wastewater treatment technology. In the organic wastewater treatment, the anaerobic membrane bioreactor combines the advantages of the membrane bioreactor and the anaerobic membrane biological treatment technology, has the characteristics of low energy consumption, strong impact load resistance, low sludge production rate, small occupied area, complete separation of Sludge Retention Time (SRT) and Hydraulic Retention Time (HRT) and the like, and has wide application prospect in the aspect of treating high-concentration wastewater. However, the anaerobic reaction produces CH4The purity is not high (generally about 28-33%), and most of the product is dissolved in water and is difficult to recover.
The part of methane is rarely recycled in the existing wastewater treatment process, and the methane is discharged along with effluent, thereby causing environmental pollution and resource waste. Therefore, the research and development of a set of anaerobic membrane bioreactor wastewater treatment technology with a methane recovery device has important practical significance, environmental protection significance and energy strategic significance.
Disclosure of Invention
Aiming at solving the problem of biological treatment of organic wastewater by an anaerobic membraneCH produced in4The invention provides a system and a method for recovering biogas energy in anaerobic membrane biological treatment of organic wastewater, which can efficiently treat high-concentration organic wastewater, efficiently separate Suspended Solids (SS), avoid a sedimentation tank, ensure that the effluent quality reaches the discharge standard, and efficiently recover CH generated in anaerobic wastewater treatment4，CH4High recovery rate of (A), and finally recovered CH4The purity of the product can reach 90%, and the effects of environmental protection and energy recycling are achieved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the invention provides a system for recovering biogas energy in anaerobic membrane biological treatment of organic wastewater, which comprises a water inlet tank, an anaerobic membrane bioreactor, a gas-liquid separation device, CH4/CO2The gas separation membrane, the water outlet tank and the gas storage tank; wherein the content of the first and second substances,
the water inlet tank is connected with the anaerobic membrane bioreactor through a water inlet pipeline with a peristaltic pump; the anaerobic membrane bioreactor is internally provided with a hollow fiber membrane component and a biogas circulating system; the hollow fiber membrane component is connected with the gas-liquid separation device through a water outlet pipeline with a water outlet peristaltic pump; the gas-liquid separation device is connected with the water outlet tank through a drainage pipeline;
the top of the anaerobic membrane bioreactor is connected with the CH through a first gas pipeline with a vacuum pump4/CO2Connecting a gas separation membrane; the gas-liquid separation device is communicated with the first gas pipeline through a second gas pipeline with a gas-liquid separation vacuum pump; the CH4/CO2The gas separation membrane passes through CH with an air pump4The recovery pipeline is connected with the gas storage tank.
Preferably, the biogas circulation system consists of an aeration disc, a circular aeration air pump and an aeration pipeline, wherein the aeration disc is arranged at the bottom of the anaerobic membrane bioreactor, and the circular aeration air pump is arranged on the aeration pipeline which is circularly communicated with the anaerobic membrane bioreactor.
Preferably, the gas-liquid separation device is a microporous hollow fiber membrane contactor.
Preferably, a transmembrane pressure difference (TMP) paper recorder is arranged on the water outlet pipeline.
Preferably, the upper part of the anaerobic membrane bioreactor is provided with an overflow port, and the outer part of the anaerobic membrane bioreactor is provided with a heat-insulating interlayer.
Preferably, the overflow port is positioned 3-5 cm above the water surface at the effective volume position of the anaerobic membrane bioreactor.
Preferably, the heat-preservation interlayer is a circulating water bath heater.
Preferably, the shell of the anaerobic membrane bioreactor is made of organic glass, and the water inlet pipeline, the water outlet pipeline, the first gas pipeline and the second gas pipeline are PE hoses.
In a second aspect, the present invention also provides a method for recovering biogas energy in anaerobic membrane biological treatment of organic wastewater, comprising the steps of:
step S1, the organic wastewater flows into the anaerobic membrane bioreactor from the water inlet tank through a water inlet pipeline with a peristaltic pump;
step S2, after the organic wastewater flows through the hollow fiber membrane component in the anaerobic membrane bioreactor, the organic wastewater is pumped by a water outlet peristaltic pump on a water outlet pipeline and flows into a gas-liquid separation device for gas-liquid separation, and the separated liquid flows into a water outlet groove through a water discharge pipeline;
step S3, CO in the anaerobic membrane bioreactor2、CH4Mixed gas and CO separated and pumped out from the gas-liquid separation device by the gas-liquid separation vacuum pump2、CH4The mixed gas is pumped into CH by a vacuum pump arranged on the first gas pipeline4/CO2A gas separation membrane;
step S4, CH4/CO2The gas separation membrane is used for separating CO in the pumped mixed gas2And CH4After the gas is subjected to a separation operation, CH4Gas channel CH with gas pump4The recovery pipeline enters the gas storage tank to finish CH4And (6) recovering.
The invention has the following beneficial effects:
the invention provides a system and a method for recovering biogas energy in organic wastewater anaerobic membrane biological treatment, which are characterized in that a gas-liquid separation device and CH4/CO2The gas separation membrane and the anaerobic membrane bioreactor are combined for application; the anaerobic membrane bioreactor effectively intercepts anaerobic sludge biological flora through effective coupling of a membrane separation technology and the anaerobic reactor, degrades high-concentration organic wastewater and efficiently separates Suspended Solids (SS), and a hollow fiber membrane component of the anaerobic membrane bioreactor can replace a sedimentation tank in the traditional activated sludge process to realize solid-liquid separation, so that the sedimentation tank does not need to be arranged again, and the quality of effluent water is ensured to reach the discharge standard.
The anaerobic membrane bioreactor is internally provided with a biogas circulating system, anaerobic gas generated by the anaerobic membrane bioreactor is circularly stirred in the anaerobic membrane bioreactor through the combined application of an aeration disc, a circular aeration air pump and an aeration pipeline, so that the internal part of the anaerobic membrane bioreactor reaches the conditions of homogeneity and temperature equalization, and more CH overflows from waste water in the anaerobic membrane bioreactor4、CO2The mixed gas and the shearing force can wash the surface of the hollow fiber membrane component, so that the pollution of the hollow fiber membrane can be relieved. The transmembrane pressure difference (TMP) paper recorder arranged on the water outlet pipeline can monitor and record the transmembrane pressure difference inside the hollow fiber membrane component in real time, and when the pressure reaches 30KPa, the hollow fiber membrane component needs to be physically and chemically cleaned.
Dissolved with a large amount of CO2And CH4The effluent of the anaerobic membrane bioreactor is pumped into the microporous hollow fiber membrane contactor by an effluent peristaltic pump for high-efficiency gas-liquid separation, a gas-liquid separation vacuum pump performs air extraction operation on the microporous hollow fiber membrane contactor to enable the microporous hollow fiber membrane contactor to reach a gas-liquid separation condition, the air extraction intensity is adjusted according to actual conditions, and the separated gas is CH4And CO2Mixed gas, CH4The recovery rate of the method can reach 99 percent; CO in the anaerobic membrane bioreactor2、CH4Mixed gas and CO separated and pumped out from gas-liquid separator2、CH4Mixed gas pump into CH4/CO2Gas separationMembrane, carrying out CH4And CO2Separation operation of recovered CH4The purity of the product can reach 90%. The invention can efficiently treat high-concentration organic wastewater, efficiently separate Suspended Solids (SS), does not need a sedimentation tank, ensures that the quality of effluent water reaches the discharge standard, and can efficiently recover CH generated in the anaerobic wastewater treatment4，CH4High recovery rate of (A), and finally recovered CH4The purity of the product can reach 90%, and the effects of environmental protection and energy recycling are achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a system structure diagram of biogas energy source in the anaerobic membrane biological treatment of organic wastewater according to the embodiment of the invention.
Description of reference numerals:
1. a water inlet groove; 2. a water inlet pipeline; 3. a peristaltic pump; 4. an anaerobic membrane bioreactor; 5. a circulating aeration air pump; 6. transmembrane pressure difference (TMP) paper recorder; 7. a water outlet peristaltic pump; 8. a gas-liquid separation device; 9. a gas-liquid separation vacuum pump; 10. a vacuum pump; 11.CH4/CO2A gas separation membrane; 12. a water outlet groove; 13. a gas storage tank; 14. an aeration disc; 15. a heat-insulating interlayer; 16. an overflow port; 17. a hollow fiber membrane module; 18. an aeration pipeline; 19. a water outlet pipeline; 20. a first gas line; 21. a second gas line; 22.CH4A recovery pipeline; 23. an air pump; 24. a drain line.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
This example provides a system for the recovery of biogas energy in anaerobic membrane biological treatment of organic wastewater, as shown in FIG. 1, the systemComprises a water inlet tank 1, an anaerobic membrane bioreactor 4, a gas-liquid separation device 8 and CH4/CO2A gas separation membrane 11, a water outlet tank 12 and a gas storage tank 13; the water inlet tank 1 is connected with the anaerobic membrane bioreactor 4 through a water inlet pipeline 2 with a peristaltic pump 3; the anaerobic membrane bioreactor 4 is internally provided with a hollow fiber membrane component 17 and a biogas circulating system; the hollow fiber membrane component 17 is connected with the gas-liquid separation device 8 through a water outlet pipeline 19 with a water outlet peristaltic pump 7; the gas-liquid separation device 8 is connected with the water outlet tank 12 through a drainage pipeline 24; the top of the anaerobic membrane bioreactor 4 is communicated with the CH through a first gas pipeline 20 with a vacuum pump 104/CO2The gas separation membrane 11 is connected; the gas-liquid separation device 8 is communicated with the first gas pipeline 20 through a second gas pipeline 21 with a gas-liquid separation vacuum pump 9, the gas-liquid separation vacuum pump 9 performs air extraction operation on the gas-liquid separation device 8 to enable the gas-liquid separation device to reach a gas-liquid separation condition, and the air extraction intensity is adjusted according to actual conditions; the CH4/CO2The gas separation membrane 11 is passed through CH with a gas pump 234The recovery line 22 is connected to the gas tank 13.
The biogas circulation system comprises an aeration disc 14, a circular aeration air pump 5 and an aeration pipeline 18, wherein the aeration disc 14 is arranged at the bottom of the anaerobic membrane bioreactor 4, and the circular aeration air pump 5 is arranged on the aeration pipeline 18 which is circularly communicated with the anaerobic membrane bioreactor 4. Anaerobic gas generated by the anaerobic membrane bioreactor 4 is circularly stirred in the anaerobic membrane bioreactor by mainly relying on a circular aeration air pump 5 and an aeration disc 14 in the anaerobic membrane bioreactor 4, so that the internal part of the anaerobic membrane bioreactor reaches the conditions of homogeneity and temperature equalization, and more CH overflows from waste water in the anaerobic membrane bioreactor 44、CO2The mixed gas and the shearing force brought by the mixed gas can wash the surface of the hollow fiber membrane module 17, so that the membrane pollution of the hollow fiber membrane module 17 can be relieved.
The gas-liquid separation device 8 is a micropore hollow fiber membrane contactor, the micropore hollow fiber membrane contactor is adopted to carry out high-efficiency gas-liquid separation on the effluent of the anaerobic reactor 4, and the gas-liquid separation vacuum pump 9 is used for carrying out high-efficiency gas-liquid separation on the micropore hollow fiber membrane contactorPerforming gas extraction to achieve gas-liquid separation condition, adjusting gas extraction intensity according to actual conditions, wherein the separated gas is CH4And CO2Mixed gas, CH4The recovery rate of the product reaches 99 percent.
A transmembrane pressure difference (TMP) paper recorder 6 is arranged on the water outlet pipeline 19, and the transmembrane pressure difference (TMP) paper recorder 6 is positioned between the hollow fiber membrane component 17 and the water outlet peristaltic pump 7 arranged on the water outlet pipeline 19; the TMP paper recorder 6 is used to monitor the transmembrane pressure difference inside the hollow fiber membrane module 17, record in real time, and physically and chemically clean the hollow fiber membrane module 17 when the pressure reaches 30 KPa.
The upper part of the anaerobic membrane bioreactor 4 is provided with an overflow port 16, and the outside is provided with a heat-insulating interlayer 15; the overflow port 16 is arranged 3-5 cm above the water surface at the effective volume position of the anaerobic membrane bioreactor 4 to control the liquid level inside the anaerobic membrane bioreactor 4; the hollow fiber membrane component 17 is suspended and immersed below the water surface at the effective volume position of the anaerobic membrane bioreactor 4; the heat-preservation interlayer 15 is a circulating water bath heater, the medium temperature condition of the anaerobic membrane bioreactor 4 is realized by arranging the circulating water bath heater outside the anaerobic membrane bioreactor 4, and the temperature is controlled at 35 ℃; the shell of the anaerobic membrane bioreactor 4 is made of organic glass, the water inlet pipeline 2, the water outlet pipeline 19, the first gas pipeline 20 and the second gas pipeline 21 are PE hoses, and the anaerobic membrane bioreactor 4, the microporous hollow fiber membrane contactor, the CH4/CO2The respective connection joints between the gas separation membranes 11 are connected by snap rings.
The embodiment also provides a method for recovering biogas energy in organic wastewater anaerobic membrane biological treatment, which is realized by the system for recovering biogas energy in organic wastewater anaerobic membrane biological treatment provided by the embodiment, and the method comprises the following steps:
step S1, the organic wastewater flows into an anaerobic membrane bioreactor 4 from a water inlet tank 1 through a water inlet pipeline 2 with a peristaltic pump 3;
step S2, after the organic wastewater flows through the hollow fiber membrane component 17 in the anaerobic membrane bioreactor 4, the organic wastewater is pumped by the water outlet peristaltic pump 7 on the water outlet pipeline 19 and flows into the gas-liquid separation device 8 for gas-liquid separation, and the separated liquid flows into the water outlet tank 12 through the water discharge pipeline 24;
step S3, CO in the anaerobic membrane bioreactor 42、CH4The mixed gas and CO separated and pumped out from the gas-liquid separation device 8 by the gas-liquid separation vacuum pump 92、CH4The mixed gas is pumped into CH by a vacuum pump 10 provided on a first gas line 204/CO2A gas separation membrane 11;
step S4, CH4/CO2The gas separation membrane 11 is used for separating CO in the pumped mixed gas2And CH4After the gas of (2) is subjected to a separation operation, CH4Gas is passed through CH with gas pump 234The recovery pipeline 22 enters the gas storage tank 13 to finish CH4And (4) recovering to realize energy recovery.
According to the technical scheme, the system and the method for recycling biogas energy in the organic wastewater anaerobic membrane biological treatment provided by the embodiment are implemented by the microporous hollow fiber membrane contactor, the CH4/CO2The gas separation membrane and the anaerobic membrane bioreactor are combined for application; the anaerobic membrane bioreactor in the system is effectively coupled with the anaerobic reactor through a membrane separation technology, so that anaerobic sludge biological flora is effectively intercepted, high-concentration organic wastewater is degraded, Suspended Solids (SS) are efficiently separated, and a hollow fiber membrane component of the anaerobic membrane bioreactor can replace a sedimentation tank in the traditional activated sludge process to realize solid-liquid separation, so that the sedimentation tank is not required to be arranged, and the quality of outlet water is ensured to reach the pollutant discharge standard of urban sewage treatment plants (GB 18918-.
Aeration is a means of bringing air into strong contact with water, and can expel unwanted gases and volatile substances from the water into the air, while also mixing and stirring. The anaerobic membrane bioreactor is internally provided with a biogas circulating system, anaerobic gas generated by the anaerobic membrane bioreactor is circularly stirred in the anaerobic membrane bioreactor through the combined application of an aeration disc, a circular aeration air pump and an aeration pipeline, so that the internal part of the anaerobic membrane bioreactor reaches the conditions of homogeneity and temperature equalization, and the waste water in the anaerobic membrane bioreactor is treatedOverflowing more CH4、CO2The mixed gas can simultaneously wash the surface of the hollow fiber membrane component by the shearing force, so as to play a role in relieving the pollution of the hollow fiber membrane; the TMP paper recorder arranged on the water outlet pipeline can monitor and record transmembrane pressure difference inside the hollow fiber membrane component in real time, and when the pressure reaches 30KPa, the hollow fiber membrane component needs to be physically and chemically cleaned.
Dissolved with a large amount of CO2And CH4The effluent of the anaerobic membrane bioreactor is pumped into the microporous hollow fiber membrane contactor by an effluent peristaltic pump for high-efficiency gas-liquid separation, a gas-liquid separation vacuum pump performs air extraction operation on the microporous hollow fiber membrane contactor to enable the microporous hollow fiber membrane contactor to reach a gas-liquid separation condition, the air extraction intensity is adjusted according to actual conditions, and the separated gas is CH4And CO2Mixed gas, CH4The recovery rate of the method can reach 99 percent; CO in the anaerobic membrane bioreactor2、CH4Mixed gas and CO separated and pumped out from gas-liquid separator2、CH4Mixed gas pump into CH4/CO2Gas separation membrane for CH4And CO2Separation operation of recovered CH4The purity of the product can reach 90%, and the effect of recycling energy is realized.
The invention can efficiently treat high-concentration organic wastewater, efficiently separate Suspended Solids (SS), does not need a sedimentation tank, ensures that the quality of effluent water reaches the discharge standard, and can efficiently recover CH generated in the anaerobic wastewater treatment4，CH4High recovery rate of (A), and finally recovered CH4The purity of the product can reach 90%, and the effects of environmental protection and energy recycling are achieved.
The embodiments of the present invention have been described in detail through the embodiments, but the description is only exemplary of the embodiments of the present invention and should not be construed as limiting the scope of the embodiments of the present invention. The scope of protection of the embodiments of the invention is defined by the claims. In the present invention, the technical solutions described in the embodiments of the present invention or those skilled in the art, based on the teachings of the embodiments of the present invention, design similar technical solutions to achieve the above technical effects within the spirit and the protection scope of the embodiments of the present invention, or equivalent changes and modifications made to the application scope, etc., should still fall within the protection scope covered by the patent of the embodiments of the present invention.

Claims (9)

1. A system for recycling biogas energy in organic wastewater anaerobic membrane biological treatment is characterized by comprising a water inlet tank, an anaerobic membrane bioreactor, a gas-liquid separation device, CH4/CO2The gas separation membrane, the water outlet tank and the gas storage tank; wherein the content of the first and second substances,
the water inlet tank is connected with the anaerobic membrane bioreactor through a water inlet pipeline with a peristaltic pump; the anaerobic membrane bioreactor is internally provided with a hollow fiber membrane component and a biogas circulating system; the hollow fiber membrane component is connected with the gas-liquid separation device through a water outlet pipeline with a water outlet peristaltic pump; the gas-liquid separation device is connected with the water outlet tank through a drainage pipeline;
the top of the anaerobic membrane bioreactor is connected with the CH through a first gas pipeline with a vacuum pump4/CO2Connecting a gas separation membrane; the gas-liquid separation device is communicated with the first gas pipeline through a second gas pipeline with a gas-liquid separation vacuum pump; the CH4/CO2The gas separation membrane passes through CH with an air pump4The recovery pipeline is connected with the gas storage tank.
2. The system for recycling biogas energy in organic wastewater anaerobic membrane biological treatment according to claim 1, wherein the biogas circulation system is composed of an aeration disc, a circular aeration air pump and an aeration pipeline, the aeration disc is arranged at the bottom of the anaerobic membrane bioreactor, and the circular aeration air pump is arranged on the aeration pipeline which is circularly communicated with the anaerobic membrane bioreactor.
3. The system for recovering biogas energy in organic wastewater anaerobic membrane biological treatment according to claim 1, characterized in that the gas-liquid separation device is a microporous hollow fiber membrane contactor.
4. The system for recycling biogas energy in organic wastewater anaerobic membrane biological treatment according to claim 1, characterized in that a transmembrane pressure difference (TMP) paper recorder is provided on the water outlet pipeline.
5. The system for recycling biogas energy in organic wastewater anaerobic membrane biological treatment according to claim 1, wherein the upper part of the anaerobic membrane bioreactor is provided with an overflow port, and the outside is provided with a heat preservation interlayer.
6. The system for recycling biogas energy in the anaerobic membrane biological treatment of organic wastewater as claimed in claim 5, wherein the overflow port is located 3-5 cm above the water surface at the effective volume position of the anaerobic membrane bioreactor.
7. The system for recycling biogas energy in organic wastewater anaerobic membrane biological treatment according to claim 5, characterized in that the heat-insulating interlayer is a circulating water bath heater.
8. The system for recycling biogas energy in organic wastewater anaerobic membrane biological treatment according to claim 1, wherein the anaerobic membrane bioreactor is made of organic glass, and the water inlet pipeline, the water outlet pipeline, the first gas pipeline and the second gas pipeline are PE hoses.
9. A method for recovering biogas energy in the anaerobic membrane biological treatment of organic wastewater is characterized by comprising the following steps:
step S1, the organic wastewater flows into the anaerobic membrane bioreactor from the water inlet tank through a water inlet pipeline with a peristaltic pump;
step S2, after the organic wastewater flows through the hollow fiber membrane component in the anaerobic membrane bioreactor, the organic wastewater is pumped by a water outlet peristaltic pump on a water outlet pipeline and flows into a gas-liquid separation device for gas-liquid separation, and the separated liquid flows into a water outlet groove through a water discharge pipeline;
step S3, CO in the anaerobic membrane bioreactor2、CH4Mixed gas and CO separated and pumped out from the gas-liquid separation device by the gas-liquid separation vacuum pump2、CH4The mixed gas is pumped into CH by a vacuum pump arranged on the first gas pipeline4/CO2A gas separation membrane;
step S4, CH4/CO2The gas separation membrane is used for separating CO in the pumped mixed gas2And CH4After the gas is subjected to a separation operation, CH4Gas channel CH with gas pump4The recovery pipeline enters the gas storage tank to finish CH4And (6) recovering.
CN202011235427.1A 2020-11-06 2020-11-06 System and method for recycling biogas energy in organic wastewater anaerobic membrane biological treatment Pending CN112194250A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115367838A (en) * 2021-05-18 2022-11-22 南开大学 Novel membrane contactor system for recovering dissolved methane in anaerobic effluent
CN117046287A (en) * 2023-10-11 2023-11-14 振华新材料(东营)有限公司 Alkali washing neutralization device for butadiene rubber

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115367838A (en) * 2021-05-18 2022-11-22 南开大学 Novel membrane contactor system for recovering dissolved methane in anaerobic effluent
CN115367838B (en) * 2021-05-18 2023-12-26 南开大学 Membrane contactor system for recycling anaerobic effluent dissolved methane
CN117046287A (en) * 2023-10-11 2023-11-14 振华新材料(东营)有限公司 Alkali washing neutralization device for butadiene rubber
CN117046287B (en) * 2023-10-11 2023-12-19 振华新材料(东营)有限公司 Alkali washing neutralization device for butadiene rubber

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