Anaerobic membrane biological reaction system suitable for sewage treatment

Abstract

The utility model relates to an anaerobic membrane biological reaction system suitable for sewage treatment. The anaerobic membrane biological reaction system comprises an adjusting tank, a UASB (Upflow Anaerobic Sludge Blanket) reactor, a pretreatment device, an anaerobic membrane device and a water producing tank which are sequentially connected through pipelines along the water flow direction, the anaerobic membrane component is arranged in the sewage treatment system, so that the removal efficiency of the UASB reactor on organic matters and the biogas yield can be further improved, and the quality of produced water is improved. The pretreatment device is arranged between the UASB reactor and the anaerobic membrane device, and suspended sludge in effluent of the UASB reactor is intercepted and filtered through a filler layer in the pretreatment device, so that the quality of inflow water of the anaerobic membrane device is improved, subsequent anaerobic membrane pollution is reduced, and the operation stability of the system is improved. According to the anaerobic membrane device, biogas generated by the UASB reactor is adopted for aeration stirring, formation of a membrane surface pollution layer is reduced, meanwhile, gas generated by aeration stirring is circulated back into the UASB reactor, and no new odor pollution is generated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sewage treatment especially to an anaerobic membrane biological reaction system suitable for sewage treatment. BACKGROUND

[0002] Anaerobic membrane biological reactor is combined with anaerobic reaction device (such as UASB, CSTR and EGSB etc.) and membrane separation technology, which can improve the organic matter removal rate of anaerobic reactor, reduce sludge quantity and reduce the risk of anaerobic sludge loss. It has good application prospect in municipal sewage, high-concentration organic wastewater and other fields.

[0003] However, in the process of treating high-concentration organic wastewater, the anaerobic membrane biological reactor has high sludge concentration in the anaerobic zone, high sludge content and high COD (chemical oxygen demand) concentration in the effluent, which needs to be intercepted by the anaerobic membrane system, resulting in problems such as serious membrane pollution, short service life of the membrane, unstable system operation, poor effluent quality and so on. UTILITY MODEL CONTENT

[0004] Therefore, it is necessary to provide an anaerobic membrane biological reaction device suitable for sewage treatment to solve the problem of high sludge content in the effluent of the existing anaerobic membrane biological reactor.

[0005] To achieve the above-mentioned purpose, the inventors provide an anaerobic membrane biological reaction system suitable for sewage treatment, which comprises a conditioning tank, a UASB reactor, a pretreatment device, an anaerobic membrane device and a water production tank connected by pipelines in sequence along the water flow direction.

[0006] The UASB reactor is provided with a three-phase separator inside, and the UASB reactor includes a clarification zone at the upper part of the UASB reactor, a reaction zone at the lower part of the UASB reactor and a biogas chamber at the top, and the effluent end of the conditioning tank is communicated with the water inlet end of the reaction zone through a water inlet pump.

[0007] The pretreatment device includes a pretreatment shell and a filler layer, which separates the inside of the pretreatment device into a supernatant zone at the upper part and a mixing zone at the lower part, and the effluent end of the clarification zone is communicated with the water inlet end of the mixing zone through a circulating pump one.

[0008] The anaerobic membrane device comprises a membrane tank and an anaerobic membrane assembly arranged in the membrane tank, the effluent end of the clear liquid zone is communicated with the water inlet end of the bottom of the membrane tank through a lifting pump, the outlet end of the anaerobic membrane assembly is communicated with the top of the water production tank through a suction pump, the bottom of the anaerobic membrane assembly is provided with a perforated aeration pipe, the biogas chamber is communicated with the perforated aeration pipe through a biogas blower two, for sending the biogas generated in the UASB reactor to the anaerobic membrane assembly for aeration and stirring, and the top of the membrane tank returns the biogas in it to the biogas chamber through a biogas blower three.

[0009] Further, the filler layer comprises a filter cloth layer and a sponge layer, the material of the filter cloth layer is non-woven fabric, and the material of the sponge layer is polyurethane porous sponge filler.

[0010] Further, the reaction system further comprises a chemical cleaning device, the chemical cleaning device comprises a medicament barrel, and the outlet end of the medicament barrel is communicated back to the outlet end of the anaerobic membrane assembly through a chemical cleaning pump.

[0011] Further, an electric valve one is arranged on the connecting pipeline of the chemical cleaning pump.

[0012] Further, the outlet end of the water production tank is communicated back to the outlet end of the anaerobic membrane assembly through a backwashing pump.

[0013] Further, an electric valve three is arranged on the connecting pipeline of the backwashing pump.

[0014] Further, the outlet end of the mixing area of the pretreatment device is provided with a circulating pump two, and the water inlet end of the reaction area of the UASB reactor is communicated through a pipeline.

[0015] Further, the gas outlet of the biogas chamber is externally connected to a biogas power plant through a biogas blower one.

[0016] Further, the outlet end of the upper end of the membrane tank is communicated with the inlet end of the mixing area through a circulating pump three.

[0017] Further, an electric valve two and a pressure gauge are arranged on the pipeline of the suction pump.

[0018] Compared with the prior art, the technical scheme has the following advantages: the anaerobic membrane assembly arranged in the sewage treatment system can further improve the removal efficiency of the UASB reactor on organic matters and the biogas production rate, and improve the water quality of the produced water. The pretreatment device is arranged between the UASB reactor and the anaerobic membrane device, the suspended sludge in the effluent of the UASB reactor is intercepted and filtered by the filler layer in the pretreatment device, the water quality of the influent of the anaerobic membrane device is improved, the subsequent anaerobic membrane pollution is reduced, and the system operation stability is improved. The anaerobic membrane device is aerated and stirred by using the biogas produced by the UASB reactor, the pollution layer on the surface of the membrane is reduced, and the gas produced by the aeration and stirring is circulated back to the UASB reactor, so that new odor pollution is not caused. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic view of an anaerobic membrane biological reaction system suitable for sewage treatment according to the present application;

[0020] Figure 2 It is a structural schematic view of a UASB reactor;

[0021] Figure 3 It is a structural schematic view of a pretreatment device;

[0022] Figure 4 It is a structural schematic view of an anaerobic membrane assembly.

[0023] BRIEF DESCRIPTION OF DRAWINGS:

[0024] 1, regulating tank; 2, water inlet pump; 3, UASB reactor; 301, biogas chamber; 302, clarification zone; 303, reaction zone; 4, three-phase separator; 5, biogas fan one; 6, biogas pressure gauge; 7, circulating water pump one; 8, lifting pump; 9, pretreatment device; 901, clear liquid zone; 902, sponge layer; 903, mixing zone; 904, filter cloth layer; 905, shell; 10, circulating water pump two; 11, circulating pump three; 12, biogas fan two; 13, biogas fan three; 14, anaerobic membrane device; 1401, membrane tank; 1402, anaerobic membrane assembly; 15, perforated aeration pipe; 16, pressure gauge; 17, electric valve one, 19, chemical cleaning pump; 20, chemical agent barrel; 21, electric valve two; 22, suction pump; 23, electric valve three; 25, backwash pump, 26, water production tank. DETAILED DESCRIPTION

[0025] In order to explain the possible application scenarios, technical principles, specific schemes that can be implemented, purposes and effects that can be achieved, etc. of the present application in detail, the following will be described in detail in combination with the specific embodiments listed and with the aid of the drawings. The embodiments described in this paper are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, but cannot limit the protection scope of the present application.

[0026] The term "embodiment" is mentioned herein means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit the independence or association between other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, each technical feature mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0027] Unless otherwise defined, the meanings of the technical terms used herein are the same as those commonly understood by those skilled in the art to which the present application belongs; the use of related terms herein is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0028] In the description of the present application, the phrase "and / or" is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this paper generally represents that the associated objects before and after are a "or" logical relationship.

[0029] In the present application, the terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary and secondary or order relationship between the entities or operations.

[0030] Without more limitations, in the present application, the "includes", "contains", "has" or other similar open expressions used in the sentence are intended to cover non-exclusive inclusion, and these expressions do not exclude the presence of other elements in the process, method or product including the described elements, so that the process, method or product including a series of elements can not only include those limited elements, but also include other elements not explicitly listed, or also include the elements inherent to such process, method or product.

[0031] As the same as the understanding in the "Guidelines for Examination", in the present application, the expressions such as "greater than", "less than", "exceed" are understood as not including the number; the expressions such as "above", "below", "within" are understood as including the number. In addition, the meaning of "multiple" in the description of the embodiments of the present application is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times", etc., unless otherwise explicitly limited.

[0032] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0033] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral arrangement; it can be a direct connection or an indirect connection through an intermediate medium; it can be a relationship of two components combined together, an interaction relationship between two components, or a connection within two structures. Those skilled in the art to which this application pertains can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0034] Please see Figures 1-4 This embodiment describes an anaerobic membrane bioreactor system suitable for wastewater treatment, comprising an equalization tank 1, a UASB reactor 3, a pretreatment device 9, an anaerobic membrane device 14, and a product water tank, which are connected sequentially by pipes along the water flow direction.

[0035] The UASB reactor 3 is equipped with a three-phase separator 4. The UASB reactor 3 includes a clarification zone 302 located at the top of the UASB reactor 3, a reaction zone 303 located at the bottom of the UASB reactor 3, and a biogas chamber 301 at the top. The water outlet of the regulating tank 1 is connected to the water inlet of the reaction zone 303 through a water inlet pump 2.

[0036] The pretreatment device 9 includes a pretreatment shell 905 and a packing layer. The packing layer divides the interior of the pretreatment device 9 into an upper clear liquid zone 901 and a lower mixing zone 903. The outlet of the clarification zone 302 is connected to the inlet of the mixing zone 903 through a circulation pump.

[0037] The anaerobic membrane device 14 comprises a membrane tank 1401 and an anaerobic membrane assembly 1402 arranged in the membrane tank 1401, the effluent end of the clear liquid zone 901 is communicated with the water inlet end of the bottom of the membrane tank 1401 through the lifting pump 8, the outlet end of the anaerobic membrane assembly 1402 is communicated with the top of the water production tank through the suction pump 22, the bottom of the anaerobic membrane assembly 1402 is provided with a perforated aeration pipe 15, the biogas chamber 301 is communicated with the perforated aeration pipe 15 through the biogas fan two 12, for sending the biogas generated in the UASB reactor 3 to the anaerobic membrane assembly 1402 for aeration and stirring, and the top of the membrane tank 1401 returns the biogas in it to the biogas chamber 301 through the biogas fan three 13.

[0038] The anaerobic membrane assembly 1402 arranged in the sewage treatment system can further improve the removal efficiency of the UASB reactor 3 on organic matter and the biogas production rate, and improve the water quality of the produced water. The pretreatment device 9 is arranged between the UASB reactor 3 and the anaerobic membrane device 14, the suspended sludge in the effluent of the UASB reactor 3 is intercepted and filtered by the filler layer in the pretreatment device 9, the water quality of the inlet of the anaerobic membrane device 14 is improved, and the subsequent anaerobic membrane pollution is reduced, and the system operation stability is improved. The anaerobic membrane device 14 uses the biogas generated by the UASB reactor 3 for aeration and stirring, which reduces the formation of the pollution layer on the membrane surface, and the gas generated by aeration and stirring is circulated back to the UASB reactor 3, without producing new odor pollution.

[0039] In some embodiments, the filler layer comprises a filter cloth layer 904 and a sponge layer 902, the filter cloth layer 904 is made of non-woven fabric with a thickness of 0.5-2cm, and the sponge layer 902 is made of polyurethane porous sponge filler with a thickness of 20-50cm. The filter cloth layer 904 made of non-woven fabric can effectively intercept the large-particle suspended sludge in the effluent of the UASB reactor 3, and the polyurethane porous sponge filler can grow biofilm, further adsorb and degrade fine suspended solids and part of the soluble organic matter, improve the water quality of the inlet of the anaerobic membrane device 14, reduce the subsequent anaerobic membrane pollution, and improve the system operation stability.

[0040] In this embodiment, a pressure gauge 16 is arranged on the setting pipeline of the suction pump 22, for monitoring the fluid pressure on the pipeline.

[0041] In some embodiments, the reaction system further comprises a chemical cleaning device, which comprises a chemical cleaning tank 20, the outlet end of the chemical cleaning tank 20 is connected to the outlet end of the anaerobic membrane assembly 1402 through a chemical cleaning pump 19. The pipeline of the chemical cleaning tank 20 connected to the pipeline of the suction pump 22 before the pressure gauge 16, that is, the chemical in the chemical cleaning tank 20 is pumped through the pressure gauge 16 and then backflows to the outlet end of the anaerobic membrane assembly 1402, so that the pressure gauge 16 can monitor the pressure value of the backflow cleaning of the chemical in the chemical cleaning tank 20.

[0042] In some embodiments, an electric valve 17 is arranged on the connecting pipeline of the chemical cleaning pump. The electric valve 17 controls the opening and closing of the connecting pipeline of the chemical cleaning pump.

[0043] In some embodiments, the outlet end of the water production tank 26 is connected to the outlet end of the anaerobic membrane assembly 1402 through a backwashing pump 25. The pipeline of the water production tank 26 connected to the pipeline of the suction pump 22 before the pressure gauge 16, that is, the water out of the water production tank is pumped through the pressure gauge 16 and then backflows to the outlet end of the anaerobic membrane assembly 1402, so that the pressure gauge 16 can monitor the pressure value of the backwashing of the water production tank.

[0044] In some embodiments, an electric valve 23 is arranged on the connecting pipeline of the backwashing pump. The electric valve 23 controls the opening and closing of the connecting pipeline of the backwashing pump.

[0045] In some embodiments, the outlet end of the mixing area 903 of the pretreatment device 9 is connected to the inlet end of the reaction area 303 of the UASB reactor 3 through a pipeline. The sewage in the mixing area 903 is pumped to the reaction area 303 of the UASB reactor 3 for further treatment by the circulation pump 2.

[0046] In some embodiments, the gas outlet of the biogas chamber 301 is connected to the biogas treatment system through a biogas fan 5. The pressure in the biogas chamber 301 is prevented from being too high. A biogas pressure gauge 6 can also be installed in the biogas chamber 301 to monitor the pressure value in the biogas chamber 301.

[0047] In some embodiments, the outlet end of the upper end of the membrane tank 1401 is connected to the inlet end of the mixing area 903 through a circulation pump 11. The pollutants outside the membrane are pumped to the pretreatment device 9 for further treatment by the circulation pump 3.

[0048] In some embodiments, an electric valve 21 is arranged on the pipeline of the suction pump 22. The electric valve 21 controls the opening and closing of the connecting pipeline of the suction pump 22.

[0049] The utility model discloses a UASB anaerobic membrane device, comprising a UASB reactor, anaerobic membrane assembly, pre-treatment device, water inlet pump, circulating water pump, circulating pump, suction pump, backwash pump, chemical cleaning pump, water outlet pump, water inlet pump, circulating water pump, circulating pump, suction pump, backwash pump, chemical cleaning pump and water outlet pump.

[0050] Finally, it needs to be explained that, although the above-mentioned embodiments have been described in the specification and drawings of the present application, but it cannot limit the patent protection scope of the present application. Any equivalent structure or equivalent flow replacement or modification of the technical solutions produced based on the essential concept of the present application, using the content described in the specification and drawings of the present application, and directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, etc., are all included in the patent protection scope of the present application.

Claims

1. An anaerobic membrane bioreactor system suitable for sewage treatment, characterized in that, It includes a regulating tank, a UASB reactor, a pretreatment unit, an anaerobic membrane unit, and a product water tank, which are connected sequentially by pipes along the water flow direction; The UASB reactor is equipped with a three-phase separator. The UASB reactor includes a clarification zone at the top, a reaction zone at the bottom, and a biogas chamber at the top. The outlet of the equalization tank is connected to the inlet of the reaction zone via an inlet pump. The pretreatment device includes a pretreatment shell and a packing layer. The packing layer divides the interior of the pretreatment device into an upper clear liquid zone and a lower mixing zone. The outlet of the clear liquid zone is connected to the inlet of the mixing zone through a circulating pump. The anaerobic membrane device includes a membrane tank and an anaerobic membrane module installed in the membrane tank. The outlet of the clear liquid zone is connected to the inlet of the bottom of the membrane tank via a lift pump. The outlet of the anaerobic membrane module is connected to the top of the product water tank via a suction pump. A perforated aeration pipe is installed at the bottom of the anaerobic membrane module. The biogas chamber is connected to the perforated aeration pipe via a biogas blower 2, which is used to send the biogas generated in the UASB reactor to the anaerobic membrane module for aeration and stirring. The top of the membrane tank returns the biogas inside to the biogas chamber via a biogas blower 3.

2. The anaerobic membrane bioreactor system suitable for sewage treatment according to claim 1, characterized in that: The filler layer includes a filter cloth layer and a sponge layer. The filter cloth layer is made of non-woven fabric, and the sponge layer is made of polyurethane porous sponge filler.

3. The anaerobic membrane bioreactor system suitable for sewage treatment according to claim 1, characterized in that: The reaction system also includes a chemical cleaning device, which includes a reagent tank. The outlet of the reagent tank is connected to the outlet of the anaerobic membrane module via a chemical cleaning pump.

4. The anaerobic membrane bioreactor system suitable for sewage treatment according to claim 3, characterized in that: An electric valve is installed on the connecting pipeline of the chemical cleaning pump.

5. The anaerobic membrane bioreactor system suitable for sewage treatment as claimed in claim 1 wherein: The outlet of the water production tank is connected to the outlet of the anaerobic membrane module via a backwash pump.

6. The anaerobic membrane bioreactor system suitable for sewage treatment according to claim 5, characterized in that: An electric valve is installed on the connecting pipeline of the backwash pump.

7. The anaerobic membrane bioreactor system suitable for sewage treatment as claimed in claim 1 wherein: The pretreatment device is equipped with a circulation pump 2 at the outlet of the mixing zone, which is connected to the inlet of the reaction zone of the UASB reactor via a pipeline.

8. The anaerobic membrane bioreactor system suitable for sewage treatment as claimed in claim 1 wherein: The gas outlet of the biogas chamber is connected to a biogas power plant via a biogas blower.

9. The anaerobic membrane bioreactor system suitable for sewage treatment as claimed in claim 1 wherein: The outlet end of the membrane tank is connected to the inlet end of the mixing zone via a circulation pump.

10. The anaerobic membrane bioreactor system suitable for sewage treatment as claimed in claim 1 wherein: The suction pump is equipped with an electric valve and a pressure gauge on its pipeline.

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