Anaerobic-membrane biological reaction unit system and cleaning method

Abstract

The invention discloses an anaerobic-membrane biological reaction unit system and a cleaning method, and belongs to the technical field of industrial wastewater treatment equipment. The system comprises a scale inhibitor dosing unit, a cleaning unit, and an anaerobic pipeline, an anaerobic reaction unit, a membrane biological pipeline and a membrane biological reaction unit which are sequentially communicated and used for sewage to enter, the scale inhibitor dosing unit is communicated with the anaerobic pipeline; the cleaning unit comprises a cleaning water tank, a plurality of water outlet pipes, a plurality of water return pipes, a plurality of water pumps and a plurality of cleaning valves; the clean water tank is communicated with the anaerobic pipeline through a water outlet pipe and a water return pipe to form a first circulation loop; the clean water tank is communicated with the membrane biological pipeline through another water outlet pipe and another water return pipe to form a second circulation loop; the multiple water pumps communicate with the first circulation loop and the second circulation loop correspondingly, and the multiple cleaning valves communicate with all the water outlet pipes and all the water return pipes. The system can be used for carrying out independent circulating flow cleaning on different flushing parts, and scales are cleaned on the premise that the system is not disassembled.

Description

Technical Field

[0001] This invention relates to the field of industrial wastewater treatment equipment technology, and in particular to an anaerobic-membrane bioreactor system and a cleaning method. Background Technology

[0002] In industrial wastewater treatment systems, the combined process of anaerobic reactors (such as UASB) and membrane bioreactors (MBR) is widely used in the treatment of high-concentration organic wastewater. It typically includes a regulating reactor, an anaerobic reactor, and a membrane bioreactor connected in sequence. Wastewater is regulated by the regulating reactor and then fed into the anaerobic reactor. Subsequently, the treated liquid from the anaerobic reactor is fed into the membrane bioreactor.

[0003] However, the system faces a significant scaling problem, manifested in two main aspects. First, scaling occurs in the anaerobic reactor unit. For wastewater with high hardness and high phosphate, inorganic scale such as calcium carbonate and struvite, as well as organic scale, are easily generated within the anaerobic reactor unit. These scales clog the water distribution system, coat granular sludge, and significantly reduce mass transfer efficiency and anaerobic reactivity. Second, the inlet pipes of the anaerobic reactor unit and the connecting pipes between the anaerobic reactor unit and the membrane bioreactor unit (the inlet pipe of the membrane bioreactor unit) are prone to scaling and thickening after long-term operation due to the transported medium being rich in bacterial flocs, suspended solids, and easily crystallizing ions. This leads to a decrease in flow rate or even complete blockage. Currently, to address this issue, ordinary flushing is insufficient to clean the scale on the pipe walls without disassembly. Regular disassembly for cleaning and maintenance is usually required, which is time-consuming and labor-intensive, severely affecting the continuity of production and forcing upstream and downstream process units to shut down. Summary of the Invention

[0004] This invention provides an anaerobic membrane bioreactor system and a cleaning method, which aims to clean scale without disassembling the system, thereby preventing scale buildup in pipes and improving the ease of cleaning.

[0005] The first aspect of the present invention provides an anaerobic-membrane bioreactor system, comprising an antiscalant dosing unit, a cleaning unit, and anaerobic pipelines, an anaerobic reaction unit, a membrane bioreactor pipeline, and a membrane bioreactor unit connected in sequence for supplying wastewater.

[0006] The scale inhibitor dosing unit is connected to the anaerobic pipeline;

[0007] The cleaning unit includes a cleaning water tank, multiple outlet pipes, multiple return pipes, multiple water pumps, and multiple cleaning valves. The cleaning water tank is connected to the anaerobic pipeline through one outlet pipe and one return pipe to form a first circulation loop. The cleaning water tank is connected to the membrane bioreactor pipeline through another outlet pipe and another return pipe to form a second circulation loop. The multiple water pumps are respectively connected to the first circulation loop and the second circulation loop, and the multiple cleaning valves are connected to each outlet pipe and each return pipe.

[0008] The opening and closing of each water pump and each of the cleaning valves are used to circulate the liquid in the cleaning water tank in the first circulation loop and / or the second circulation loop, or to make the liquid in the cleaning water tank flow sequentially through the outlet pipe of the first circulation loop, the anaerobic pipeline, the anaerobic reaction unit, the membrane bio-pipeline, the return pipe of the second circulation loop, and return to the cleaning water tank.

[0009] In some embodiments of the first aspect, the anaerobic pipeline includes an anaerobic pump and an anaerobic pipe body connected in sequence.

[0010] The anaerobic pump is used to pump sewage into the anaerobic pipe body;

[0011] The inlet end of the anaerobic tube body or the inlet end of the anaerobic pump is connected to the outlet pipe of the first circulation loop, and the outlet end of the anaerobic tube body is connected to the return pipe of the first circulation loop and the anaerobic reaction unit.

[0012] The inlet end of the anaerobic pump or the inlet end of the anaerobic pipe body is connected to the scale inhibitor dosing unit.

[0013] In some embodiments of the first aspect, the membrane bioline includes a membrane biopump and a membrane bioline body connected in sequence;

[0014] The membrane biopump is connected to the effluent end of the anaerobic reaction unit, and the membrane biopump is used to pump sewage into the membrane biopump body;

[0015] The inlet end of the membrane biotube body or the inlet end of the membrane biopump is connected to the outlet pipe of the second circulation loop, and the outlet end of the membrane biotube body is connected to the return pipe of the second circulation loop and the membrane bioreactor unit.

[0016] In some embodiments of the first aspect, an anaerobic discharge outlet is provided on the anaerobic pipeline;

[0017] The membrane bio-pipeline is equipped with a membrane bio-discharge outlet.

[0018] In some embodiments of the first aspect, the cleaning water tank includes a tank body, a first filter assembly for filtering dirt, and a second filter assembly for adsorbing bacteria and microorganisms;

[0019] The top and bottom of the box body are respectively provided with a liquid inlet and a liquid outlet;

[0020] The first filter assembly and the second filter assembly are arranged sequentially along the direction from the liquid inlet to the liquid outlet.

[0021] In some embodiments of the first aspect, the first filtering assembly includes a plurality of filter plates;

[0022] The plurality of filter plates are detachably connected to the housing body, and the plurality of filter plates are arranged along the height direction of the housing body, with a gap between adjacent filter plates;

[0023] Along the direction from the liquid inlet to the liquid outlet, the filter holes of the plurality of filter plates gradually become smaller.

[0024] In some embodiments of the first aspect, the second filter assembly includes an S-shaped baffle and activated carbon strips;

[0025] The S-shaped guide plate is detachably connected to the box body, and multiple activated carbon strips are installed between the S-shaped guide plate and the box body.

[0026] In some embodiments of the first aspect, the cleaning unit further includes a disinfectant dosing tank, which is connected and conductive to the cleaning water tank.

[0027] In some embodiments of the first aspect, the scale inhibitor dosing unit is filled with a scale inhibitor, which is an anaerobic scale inhibitor for inorganic salt scale and / or organic scale.

[0028] A second aspect of the present invention provides a cleaning method applied to the anaerobic-membrane bioreactor system described in the first aspect, comprising the following steps:

[0029] The scale inhibitor dosing mechanism is used to add chemicals to the inlet pipe of the anaerobic reaction unit;

[0030] Turn on the cleaning water pump and cleaning valve in the first circulation loop, and / or the cleaning water pump and cleaning valve in the second circulation loop, so that the liquid in the cleaning water tank circulates in the first circulation loop and / or the second circulation loop, or so that the liquid in the cleaning water tank flows sequentially through the outlet pipe of the first circulation loop, the anaerobic pipe, the anaerobic reaction unit, the membrane biological pipe, and the return pipe of the second circulation loop.

[0031] As can be seen from the above technical solutions, the present invention has the following advantages:

[0032] This embodiment provides an anaerobic-membrane bioreactor system and cleaning method, including a scale inhibitor dosing unit, a cleaning unit, and sequentially connected anaerobic pipelines for supplying wastewater, an anaerobic reaction unit, a membrane bioreactor pipeline, and a membrane bioreactor unit. Because the scale inhibitor dosing mechanism can precisely add scale inhibitors to the anaerobic pipelines, it inhibits the nucleation and growth of scale crystals at the source, achieving "online, continuous, and proactive" protection for the anaerobic reaction unit and its water distribution system. This transforms passive shutdown cleaning into proactive prevention, greatly extending the cleaning cycle and ensuring the continuous, efficient, and stable operation of the anaerobic system. Furthermore, the opening and closing of each cleaning valve allows the liquid in the cleaning tank to... The system circulates within the first and / or second circulation loops. This means that it can perform individual circulation cleaning based on different flushing points, or it can flow through the outlet pipe of the first circulation loop, anaerobic pipes, anaerobic reaction units, membrane bioreactor pipes, and return pipe of the second circulation loop. It can also perform overall circulation cleaning. This circulation cleaning method can create continuous turbulence and shear force, repeatedly and powerfully flushing the pipe walls and equipment inner walls, which can more effectively remove dirt. Combined with the switchable individual and overall cleaning methods, the two cleaning methods can effectively clean the dirt inside the system, with good anti-scaling effect and high cleaning convenience. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the overall structure of an anaerobic-membrane bioreactor system provided in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the internal structure of the cleaning water tank provided in an embodiment of the present invention.

[0036] Figure label:

[0037] Scale inhibitor dosing unit 1; Scale inhibitor dosing tank 10; Dosing pump 11; Dosing pipe 12; Dosing valve 13;

[0038] Cleaning unit 2; Cleaning water tank 20; Tank body 200; First filter assembly 201; Filter plate 2010; Second filter assembly 202; S-shaped guide plate 2020; Activated carbon strip 2021; Outlet pipe 21; Return pipe 22; Water pump 23; Cleaning valve 24; First circulation loop 25; Second circulation loop 26; Disinfectant dosing tank 27; Disinfection valve 28; Disinfection pump 29;

[0039] 3. Anaerobic pipeline; 30. Anaerobic pump; 31. Anaerobic pipe body; 32. Anaerobic discharge outlet; 33. Anaerobic discharge valve;

[0040] Anaerobic reaction unit 4; Anaerobic reactor 40; Anaerobic valve 41;

[0041] 5. Membrane bioreactor pipeline; 50. Membrane bioreactor pump; 51. Membrane bioreactor body; 52. Membrane bioreactor drain outlet; 53. Membrane bioreactor drain valve;

[0042] Membrane bioreactor unit 6; Membrane bioreactor 60; Membrane biovalves 61;

[0043] Regulating unit 7; regulating tank 70; regulating valve 71. Detailed Implementation

[0044] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0045] Traditional industrial wastewater treatment systems typically include a regulating reactor, an anaerobic reactor, and a membrane bioreactor connected in sequence. Wastewater is regulated by the regulating reactor before being fed into the anaerobic reactor, and the treated liquid from the anaerobic reactor is then fed into the membrane bioreactor. However, this system faces a significant scaling problem.

[0046] This invention provides an anaerobic membrane bioreactor system and a cleaning method, which aims to clean pipe scale without disassembling the system, thereby preventing pipe scale buildup and improving cleaning convenience.

[0047] Please see Figure 1 The first aspect of the present invention provides an anaerobic-membrane bioreactor system, comprising an antiscalant dosing unit 1, a cleaning unit 2, and a regulating unit 7, an anaerobic pipeline 3 for supplying wastewater, an anaerobic reaction unit 4, a membrane bioreactor pipeline 5, and a membrane bioreactor unit 6 connected in sequence.

[0048] Scale inhibitor dosing unit 1 is connected to anaerobic pipeline 3;

[0049] The cleaning unit 2 includes a cleaning water tank 20, multiple outlet pipes 21, multiple return pipes 22, multiple water pumps 23, and multiple cleaning valves 24. The cleaning water tank 20 is connected to the anaerobic pipeline 3 through an outlet pipe 21 and a return pipe 22 to form a first circulation loop 25. The cleaning water tank 20 is connected to the membrane bio-pipeline 5 through another outlet pipe 21 and another return pipe 22 to form a second circulation loop 26. The multiple water pumps 23 are respectively connected to the first circulation loop 25 and the second circulation loop 26, and the multiple cleaning valves 24 are connected to each outlet pipe 21 and each return pipe 22.

[0050] The opening and closing of each water pump 23 and each cleaning valve 24 are used to circulate the liquid in the cleaning water tank 20 in the first circulation loop 25 and / or the second circulation loop 26, or to make the liquid in the cleaning water tank 20 flow sequentially through the outlet pipe 21 of the first circulation loop 25, the anaerobic pipeline 3, the anaerobic reaction unit 4, the membrane biological pipeline 5, and the return pipe 22 of the second circulation loop 26 and return to the cleaning water tank 20.

[0051] It should be noted that the inlet and outlet ends of the regulating unit 7, the anaerobic reaction unit 4, and the membrane bioreactor 6 are all equipped with control valves. Therefore, for example, when the cleaning valves 24 on the outlet pipe 21 and the return pipe 22 in the first circulation loop 25 are both opened, the liquid in the cleaning tank 20 can circulate and clean in the first circulation loop 25. The second circulation loop 26 is similar, and will not be described in detail here.

[0052] In one routine operation of this system, the regulating unit 7 performs preliminary conditioning treatment on the wastewater entering the system, such as adjusting parameters like pH and temperature, to bring it to the suitable conditions required by the anaerobic reaction unit 4. After receiving the conditioned wastewater, the anaerobic reaction unit 4 carries out anaerobic microbial reactions to decompose and transform the organic matter in the wastewater. The membrane bioreactor 6 further treats the liquid after the anaerobic reaction, using membrane filtration to remove impurities and microorganisms from the liquid, so that the treated water meets higher water quality standards.

[0053] When the system needs cleaning and descaling after operating for a period of time, the scale inhibitor dosing unit 1 will add scale inhibitor to the anaerobic pipeline 3 according to a preset ratio to prevent scaling during subsequent reactions and affecting the normal operation of the reactor. Then, the operator selects and opens the corresponding cleaning valve 24 according to the part or pipeline to be cleaned. For example, to clean the anaerobic pipeline 3, after the scale inhibitor dosing unit 1 adds the agent, the cleaning valves 24 on the outlet pipe 21 and return pipe 22 of the first circulation loop 25 are opened, and the cleaning solution in the cleaning tank 20 circulates in the first circulation loop 25 to clean the anaerobic pipeline 3. To clean the membrane bioreactor pipeline 5, after the scale inhibitor dosing unit 1 adds the agent, the second circulation loop 26 is opened. The cleaning valves 24 on the outlet pipe 21 and return pipe 22 allow the cleaning solution to circulate in the second circulation loop 26, thus cleaning the inlet pipe of the membrane bioreactor unit 6. If the inlet pipe from the anaerobic reactor unit 4 to the inlet pipe of the membrane bioreactor unit 6 needs to be cleaned, after the scale inhibitor dosing unit 1 adds the agent, the cleaning valves 24 on the outlet pipe 21 of the first circulation loop 25 and the return pipe 22 of the second circulation loop 26 are opened, so that the liquid flows sequentially through the outlet pipe 21 of the first circulation loop 25, the anaerobic pipeline 3, the anaerobic reactor unit 4, the membrane bioreactor pipeline 5, the return pipe 22 of the second circulation loop 26, and returns to the cleaning water tank 20, thus cleaning the entire anaerobic pipeline 3-anaerobic reactor 40-membrane bioreactor pipeline 5.

[0054] Therefore, this embodiment has the following advantages: First, proactive prevention and continuous protection: By continuously adding a special scale inhibitor to the anaerobic pipeline 3 of the anaerobic reaction unit 4, the nucleation and growth of scale crystals are inhibited from the source, realizing "online, continuous, and proactive" protection of the anaerobic reaction unit 4 and its water distribution system. This transforms passive shutdown cleaning into proactive prevention, greatly extending the cleaning cycle and ensuring the continuous, efficient, and stable operation of the anaerobic system. Second, online cleaning, high efficiency and convenience: Different flushing parts can be individually or as a whole circulatory flow cleaning. The independent pipeline cleaning loop of the circulatory flow cleaning method realizes uninterrupted cleaning of the anaerobic pipeline 3 and the membrane bio-pipeline 5. Combined with the individual and overall switchable cleaning methods, the combination of the two cleaning methods can effectively clean the dirt inside the system, with good anti-scaling effect and high cleaning convenience, greatly shortening the maintenance time (from several hours to half an hour), reducing labor intensity and safety risks. Therefore, this embodiment fundamentally solves the unplanned shutdown caused by scaling and pipeline blockage in the anaerobic reaction unit 4, improving the reliability, stability, and treatment efficiency of the entire water treatment system.

[0055] It is understandable that operators in the field can switch flushing methods based on the current level of fouling in the system:

[0056] In a specific implementation process, when the fouling in the system is very serious, the operator can operate each water pump 23 and cleaning valve 24 to make the first circulation loop 25 and the second circulation loop 26 operate independently. After cleaning the anaerobic pipeline 3 and the membrane biological pipeline 5 separately, the operator can switch each water pump 23 and cleaning valve 24 to make the liquid flow sequentially through the outlet pipe 21 of the first circulation loop 25, the anaerobic pipeline 3, the anaerobic reaction unit 4, the membrane biological pipeline 5, the return pipe 22 of the second circulation loop 26, and return to the cleaning water tank 20, thereby achieving cleaning when the fouling in the system is very serious.

[0057] In a specific implementation process, when the fouling in the system is relatively light, the operator can operate each water pump 23 and cleaning valve 24 to make the liquid flow sequentially through the outlet pipe 21 of the first circulation loop 25, the anaerobic pipeline 3, the anaerobic reaction unit 4, the membrane biological pipeline 5, the return pipe 22 of the second circulation loop 26, and return to the cleaning water tank 20, thereby achieving cleaning when the fouling in the system is relatively light.

[0058] In one specific embodiment, to achieve intelligent operation, the anaerobic-membrane bioreactor system further includes a control mechanism, which includes a controller and multiple detectors. The multiple detectors are all signal-connected to the controller and are respectively built into the anaerobic pipeline 3 and the membrane bioreactor pipeline 5. The controller receives signals from the multiple detectors. If a detector in the anaerobic pipeline 3 or the membrane bioreactor pipeline 5 detects fouling accumulation, the controller controls the corresponding water pump 23 and cleaning valve 24 in the circulation loop to open for cleaning. If a detector in the anaerobic pipeline 3 and the membrane bioreactor pipeline 5 detects fouling accumulation, the controller controls the water pumps and cleaning valves in the corresponding two circulation loops to open for the first round of cleaning. Subsequently, the controller controls each water pump 23 and cleaning valve 24 to allow the liquid to flow sequentially through the outlet pipe 21 of the first circulation loop 25, the anaerobic pipeline 3, the anaerobic reactor 4, the membrane bioreactor pipeline 5, and the return pipe 22 of the second circulation loop 26, returning to the cleaning tank 20.

[0059] In one specific embodiment, such as Figure 1 As shown, in order to reduce the impact of dirt on the water pump 23, a feasible structure for the first circulation loop 25 and the second circulation loop 26 is further provided. The water pump 23 is installed on the outlet pipe 21, that is, one water pump 23 is installed on the outlet pipe 21 of the first circulation loop 25, and the other water pump 23 is installed on the outlet pipe 21 of the second circulation loop 26. In specific implementation, the water pump 23 is connected to the outlet end of the cleaning water tank 20. The outlet end of the cleaning water tank 20 contains less dirt, and the water pump 23 is not prone to dirt deposition.

[0060] In one specific embodiment, such as Figure 1As shown, to improve the flushing effect of the anaerobic pipeline 3, a feasible structure for the anaerobic pipeline 3 is further provided. The anaerobic pipeline 3 includes an anaerobic pump 30 and an anaerobic pipe body 31 connected in sequence. The anaerobic pump 30 is connected to the equalization tank 70 and is used to pump the sewage pump 23 into the anaerobic pipe body 31. The inlet end of the anaerobic pipe body 31 or the inlet end of the anaerobic pump 30 is connected to the outlet pipe 21 of the first circulation loop 25, and the outlet end of the anaerobic pipe body 31 is connected to the return pipe 22 of the first circulation loop 25 and the anaerobic reaction unit 4. The inlet end of the anaerobic pump 30 or the inlet end of the anaerobic pipe body 31 is connected to the scale inhibitor dosing unit 1. When connected to the inlet of the anaerobic pump 30, the scale inhibitor is fully mixed with the wastewater before it enters the anaerobic pump 30, allowing it to be more evenly dispersed in the wastewater. It then enters the anaerobic tube body 31 along with the wastewater, thus better inhibiting the formation of scale crystals from the source. When connected to the inlet of the anaerobic tube body 31, the scale inhibitor enters the anaerobic tube body 31 directly, allowing for precise scale inhibition treatment of the internal environment of the anaerobic tube body 31 and improving the protection effect of the anaerobic tube body 31. In practice, since the flushing path of the first circulation loop 25 covers the entire anaerobic tube body 31, the entire anaerobic tube body 31 can be flushed thoroughly by the water from the cleaning water tank 20.

[0061] In one specific embodiment, such as Figure 1 As shown, to improve the flushing effect of the membrane bioreactor 5, a feasible structure for the membrane bioreactor 5 is further provided. The membrane bioreactor 5 includes a membrane bioreactor pump 50 and a membrane bioreactor body 51 connected in sequence. The membrane bioreactor pump 50 is connected to the outlet end of the anaerobic reaction unit 4, and is used to pump wastewater 23 into the membrane bioreactor body 51. The inlet end of the membrane bioreactor body 51 or the inlet end of the membrane bioreactor pump 50 is connected to the outlet pipe 21 of the second circulation loop 26, and the outlet end of the membrane bioreactor body 51 is connected to the return pipe 22 of the second circulation loop 26 and the membrane bioreactor body 51. Unit 6 is connected. When connected to the inlet of the membrane biopump 50, the water flow in the second circulation loop 26 can flush the inside of the membrane biopump 50 and then clean the membrane biopump body 51. When connected to the inlet of the membrane biopump body 51, the flushing water can directly enter the membrane biopump body 51 and flush the environment inside the membrane biopump body 51. In specific implementation, since the flushing path of the second circulation loop 26 covers the entire membrane biopump body 51, the entire membrane biopump body 51 can be flushed by the water in the cleaning tank 20.

[0062] Based on the above embodiments, such as Figure 1As shown, for convenient sewage discharge, an anaerobic sewage outlet 32 ​​is provided on the anaerobic pipeline 3; a membrane biological sewage outlet 52 is provided on the membrane biological pipeline 5. In specific implementation, during the initial cleaning stage, a large amount of precipitates and other impurities can be discharged using each sewage outlet to avoid increasing the circulation burden. Specifically, the anaerobic sewage outlet 32 ​​is located at the bottom of the anaerobic pipeline 3 to facilitate the discharge of precipitates and other impurities generated during the anaerobic reaction; the membrane biological sewage outlet 52 is located at a lower position on the membrane biological pipeline 5, so that the accumulated dirt and residual wastewater in the membrane biological pipeline 5 can be discharged more thoroughly during sewage discharge, ensuring the cleanliness and normal operation of the entire system.

[0063] In one specific embodiment, such as Figure 2 As shown, a feasible structure for a cleaning water tank 20 is further provided. The cleaning water tank 20 includes a tank body 200, a first filter assembly 201 for filtering dirt, and a second filter assembly 202 for adsorbing bacteria. The top and bottom of the tank body 200 are respectively provided with an inlet and an outlet. The first filter assembly 201 and the second filter assembly 202 are arranged sequentially along the direction from the inlet to the outlet. In specific implementation, the water to be treated entering from the inlet first passes through the first filter assembly 201. The first filter assembly 201 adopts a multi-layer filter structure, which can effectively intercept larger particles of dirt and impurities in the water, preventing them from entering the subsequent treatment stage and causing blockage or affecting the treatment effect. The water that has been preliminarily filtered by the first filter assembly 201 then flows into the second filter assembly 202. The second filter assembly 202 adopts a material with strong adsorption properties, which can adsorb bacteria, microorganisms, and some small harmful substances in the water, further purifying the water quality. After being treated by these two layers of filtration components, the water flows out from the outlet, providing a clean water source for the subsequent cleaning of the membrane biotube body 51 and the membrane biopump 50, ensuring the cleaning effect, and thus ensuring the normal operation and efficient processing capacity of the entire anaerobic-membrane bioreactor unit 6 system.

[0064] In one embodiment, such as Figure 2As shown, a feasible structure of the first filter assembly 201 is further provided. The first filter assembly 201 includes multiple filter plates 2010. The multiple filter plates 2010 are detachably connected to the tank body 200. The multiple filter plates 2010 are arranged along the height direction of the tank body 200, and there is a gap between adjacent filter plates 2010. Along the direction from the liquid inlet to the liquid outlet, the filter holes of the multiple filter plates 2010 gradually become smaller. That is, the filter holes of the filter plates 2010 closer to the liquid inlet are larger, and the filter holes of the filter plates 2010 closer to the liquid outlet are smaller. In specific implementation, the water to be treated entering from the liquid inlet first comes into contact with the filter plates 2010 with larger filter holes. These larger filter holes allow water to pass through quickly. At the same time, it intercepts larger particles of dirt and impurities in the water, preventing them from entering the subsequent finer filtration stages and causing blockages. As the water flows forward, it passes through filter plates 2010 with progressively smaller pores. Each filter plate 2010 intercepts impurities of different particle sizes, creating a gradient filtration effect. This design not only improves filtration efficiency but also extends the service life of each filter plate 2010 because impurities of different particle sizes are dispersed on different filter plates 2010, avoiding premature clogging of a single filter plate 2010. Finally, the water treated by multiple layers of filter plates 2010 has a significantly reduced impurity content, providing cleaner inlet water conditions for the subsequent second filtration component 202.

[0065] In one embodiment, such as Figure 2 As shown, a feasible structure for the second filter assembly 202 is further provided. The second filter assembly 202 includes an S-shaped guide plate 2020 and activated carbon strips 2021. The S-shaped guide plate 2020 is detachably connected to the tank body 200. Multiple activated carbon strips 2021 are installed between the S-shaped guide plate 2020 and the tank body 200. In specific implementation, water treated by the first filter assembly 201 flows into the second filter assembly 202 and first comes into contact with the S-shaped guide plate 2020. The design of the S-shaped guide plate 2020 causes the water flow to... The water flow continuously changes direction during the process, increasing the contact time and contact area between the water flow and the activated carbon strips 2021. Multiple activated carbon strips 2021 are evenly distributed between the S-shaped guide plate 2020 and the main body 200. The activated carbon strips 2021 have a rich microporous structure, which can adsorb impurities such as tiny particles, organic matter, odors and some heavy metal ions in the water, further purifying the water quality and ensuring that the second filter component 202 always maintains good filtration performance. The water treated by the second filter component 202 achieves self-cleaning of circulating water.

[0066] Based on the above embodiments, such as Figure 1As shown, in one embodiment, the cleaning unit 2 further includes a disinfectant dosing tank 27. The disinfectant dosing tank 27 is connected to the cleaning water tank 20 through a disinfection valve 28 and a disinfection pump 29. In specific implementation, the disinfectant dosing tank 27 will add a quantitative amount of disinfectant to the cleaning water tank 20 according to a preset program or according to the results of water quality testing. The disinfectant diffuses in the water and mixes thoroughly with the water, which can effectively kill bacteria, viruses and other microorganisms in the water, further ensuring the cleanliness of the treated water.

[0067] In one embodiment, the cleaning water tank, the outlet pipe 21, and the return pipe 22 are all made of corrosion-resistant materials, preferably polyethylene. The inner walls of the cleaning water tank, the outlet pipe 21, and the return pipe 22 can be coated with a Teflon layer. The volume of the cleaning water tank is 0.5-2 m³.

[0068] In one specific embodiment, such as Figure 1 As shown, a feasible structure for the scale inhibitor dosing unit 1 is further provided. The scale inhibitor dosing unit 1 includes a scale inhibitor dosing tank 10, a dosing pump 11, a dosing pipe 12, and a dosing valve 13. The dosing pipe 12 is connected to the scale inhibitor dosing tank 10 and the anaerobic pipeline 3. The dosing pump 11 and the dosing valve 13 are connected to the dosing pipe 12. The scale inhibitor dosing unit 1 is filled with a scale inhibitor, which is an anaerobic scale inhibitor for inorganic salt scale and / or organic scale. Specifically, an anaerobic-specific scale inhibitor specially selected for inorganic salt scale (such as calcium carbonate, struvite) and organic scale is added. When the dosing pump 11 starts according to a preset frequency or according to the water quality, it is set to continuous or intermittent dosing mode. The scale inhibitor in the scale inhibitor dosing tank 10 is quantitatively delivered to the anaerobic pipeline 3 through the dosing pipe 12. The scale inhibitor diffuses in the anaerobic pipeline 3 with the water flow, which can effectively inhibit the formation and accumulation of inorganic salt scale and organic scale on the inner wall of the pipeline and the surface of related equipment. This prevents problems such as pipeline blockage and reduced equipment operating efficiency caused by scaling, ensuring that the anaerobic-membrane bioreactor system can operate stably and efficiently, extending the service life of the equipment and reducing the maintenance cost of the system.

[0069] In one specific embodiment, such as Figure 1 As shown, a feasible structure for the regulating unit 7 is further provided. The regulating unit 7 includes a regulating tank 70 and a regulating valve 71. The regulating tank 70 is used for sludge storage. The regulating valve 71 is connected to the outlet of the regulating tank 70 and the anaerobic pipeline 3. The regulating tank 70 can be one of a mechanical stirring regulating tank 70, an air stirring regulating tank 70, a hydraulic circulation regulating tank 70, or a baffle regulating tank 70. In specific implementation, the regulating unit 7 serves as the front end of the wastewater treatment of the entire system. By collecting raw water of different time periods and concentrations, the regulating unit 7 overcomes the fluctuations in water quantity and quality caused by the imbalance of production or domestic drainage, creating stable influent conditions for downstream anaerobic reaction units 4, etc.

[0070] In one specific embodiment, such as Figure 1 As shown, a feasible structure for the anaerobic reaction unit 4 is further provided, including an anaerobic reactor 40 and an anaerobic valve 41. The inlet end of the anaerobic reactor 40 is connected to the anaerobic pipeline 3, and the anaerobic valve 41 connects the inlet end of the anaerobic reactor 40 to the anaerobic pipeline 3. Specifically, the anaerobic reactor 40 can be one of an upflow anaerobic sludge bed, an expanded granular sludge bed, an internal circulation reactor, or an anaerobic baffled reactor. In specific implementation, under anaerobic conditions, the anaerobic reaction unit 4 uses facultative bacteria and anaerobic bacteria to decompose complex macromolecular organic matter in wastewater into small molecule organic matter (such as volatile fatty acids), acetic acid, carbon dioxide, and methane, thereby effectively reducing the organic load of the subsequent membrane bioreactor 6 and realizing the resource recovery of organic pollutants.

[0071] In one specific embodiment, such as Figure 1 As shown, a feasible structure for the membrane bioreactor unit 6 is further provided. The membrane bioreactor unit 6 includes a membrane bioreactor 60 and a membrane bioreactor valve. The inlet end of the membrane bioreactor 60 is connected to the membrane bioreactor pipeline, and the membrane bioreactor valve is connected between the inlet end of the membrane bioreactor 60 and the membrane bioreactor pipeline. The membrane bioreactor 60 can be a separate or integrated membrane bioreactor unit 6. The specific membrane type can be one of hollow fiber membrane, flat sheet membrane, and tubular membrane. In specific implementation, the membrane bioreactor unit 6 utilizes the microbial community in the activated sludge to degrade organic pollutants in the wastewater under aerobic conditions, and at the same time utilizes the high-precision physical retention effect of the membrane module to achieve complete separation of sludge and treated effluent.

[0072] A second aspect of the present invention provides a cleaning method applied to an anaerobic-membrane bioreactor system, comprising the following steps:

[0073] The scale inhibitor dosing mechanism is used to add chemicals to the inlet pipe of anaerobic reaction unit 4;

[0074] Turn on the cleaning water pump 23 and cleaning valve 24 on the first circulation loop 25, and / or the cleaning water pump 23 and cleaning valve 24 on the second circulation loop 26, so that the liquid in the cleaning water tank 20 circulates in the first circulation loop 25 and / or the second circulation loop 26, or so that the liquid in the cleaning water tank 20 flows sequentially through the outlet pipe 21 of the first circulation loop 25, the anaerobic pipeline 3, the anaerobic reaction unit 4, the membrane bio-pipeline 5, and the return pipe 22 of the second circulation loop 26.

[0075] During the cleaning process in this embodiment, the operator can determine the amount of dirt buildup within the system based on the following:

[0076] When the fouling in the system is very severe, the operator can operate each water pump 23 and cleaning valve 24 to make the first circulation loop 25 and the second circulation loop 26 operate independently. After cleaning the anaerobic pipeline 3 and the membrane bio-pipeline 5 separately, the operator can switch each water pump 23 and cleaning valve 24 to make the liquid flow sequentially through the outlet pipe 21 of the first circulation loop 25, the anaerobic pipeline 3, the anaerobic reaction unit 4, the membrane bio-pipeline 5, the return pipe 22 of the second circulation loop 26, and return to the cleaning water tank 20, thereby achieving cleaning when the fouling in the system is very severe.

[0077] When the fouling buildup in the system is relatively light, the operator can operate each water pump 23 and cleaning valve 24 to make the liquid flow sequentially through the outlet pipe 21 of the first circulation loop 25, the anaerobic pipeline 3, the anaerobic reaction unit 4, the membrane biological pipeline 5, the return pipe 22 of the second circulation loop 26, and return to the cleaning water tank 20, thereby achieving cleaning when the fouling buildup in the system is relatively light.

[0078] In this specific implementation, the scale inhibitor dosing mechanism will precisely control the dosage according to the influent water quality of the anaerobic reaction unit 4 to ensure that the added scale inhibitor can effectively prevent scale formation in the pipeline and reaction unit. When the cleaning water pump 23 and cleaning valve 24 on the first circulation loop 25 are turned on, the cleaning solution with a specific ratio in the cleaning water tank 20 flows rapidly along the first circulation loop 25 under the action of the pump, flushing the outlet pipe 21 in the first circulation loop 25 and removing impurities and dirt attached to the pipe wall. If the cleaning water pump 23 and cleaning valve 24 on the second circulation loop 26 are turned on at the same time, the cleaning solution will continue to flow through the anaerobic pipeline 3 in sequence to thoroughly clean the anaerobic pipeline 3, ensuring that the anaerobic pipeline 3 is clean. The cleaning solution ensures unobstructed flow, preventing blockages from affecting the normal operation of the anaerobic reaction unit 4. Upon entering the anaerobic reaction unit 4, the cleaning solution comes into full contact with the sludge and residual substances within, further dissolving and removing pollutants for deep cleaning. Subsequently, the cleaning solution flows into the membrane bioreactor 5 to clean it, preventing the growth of microorganisms or the formation of deposits. Finally, the cleaning solution flows back to the cleaning water tank 20 through the return water pipe 22 of the second circulation loop 26, completing a full cycle of cleaning. Therefore, this cyclic cleaning method can comprehensively and thoroughly clean all parts of the anaerobic-membrane bioreactor system, effectively improving the system's operating efficiency and stability.

[0079] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0080] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0081] Finally, it should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

Claims

1. An anaerobic-membrane bioreactor system, characterized in that, It includes a scale inhibitor dosing unit, a cleaning unit, and anaerobic pipelines, anaerobic reaction units, membrane bioreactors, and membrane bioreactors connected in sequence for supplying wastewater. The scale inhibitor dosing unit is connected to the anaerobic pipeline; The cleaning unit includes a cleaning water tank, multiple outlet pipes, multiple return pipes, multiple water pumps, and multiple cleaning valves. The cleaning water tank is connected to the anaerobic pipeline through one outlet pipe and one return pipe to form a first circulation loop. The cleaning water tank is connected to the membrane bioreactor pipeline through another outlet pipe and another return pipe to form a second circulation loop. The multiple water pumps are respectively connected to the first circulation loop and the second circulation loop, and the multiple cleaning valves are connected to each outlet pipe and each return pipe. The opening and closing of each water pump and each of the cleaning valves are used to circulate the liquid in the cleaning water tank in the first circulation loop and / or the second circulation loop, or to make the liquid in the cleaning water tank flow sequentially through the outlet pipe of the first circulation loop, the anaerobic pipeline, the anaerobic reaction unit, the membrane bio-pipeline, the return pipe of the second circulation loop, and return to the cleaning water tank.

2. The anaerobic-membrane bioreactor system according to claim 1, characterized in that, The anaerobic pipeline includes an anaerobic pump and an anaerobic pipeline body connected in sequence. The anaerobic pump is used to pump sewage into the anaerobic pipe body; The inlet end of the anaerobic tube body or the inlet end of the anaerobic pump is connected to the outlet pipe of the first circulation loop, and the outlet end of the anaerobic tube body is connected to the return pipe of the first circulation loop and the anaerobic reaction unit. The inlet end of the anaerobic pump or the inlet end of the anaerobic pipe body is connected to the scale inhibitor dosing unit.

3. The anaerobic-membrane bioreactor system according to claim 1, characterized in that, The membrane bioline includes a membrane biopump and a membrane bioline body connected in sequence. The membrane biopump is connected to the effluent end of the anaerobic reaction unit, and the membrane biopump is used to pump sewage into the membrane biopump body; The inlet end of the membrane biotube body or the inlet end of the membrane biopump is connected to the outlet pipe of the second circulation loop, and the outlet end of the membrane biotube body is connected to the return pipe of the second circulation loop and the membrane bioreactor unit.

4. The anaerobic-membrane bioreactor system according to claim 1, characterized in that: An anaerobic discharge outlet is provided on the anaerobic pipeline; The membrane bio-pipeline is equipped with a membrane bio-discharge outlet.

5. The anaerobic-membrane bioreactor system according to claim 1, characterized in that, The cleaning water tank includes a tank body, a first filter assembly for filtering dirt, and a second filter assembly for adsorbing bacteria and microorganisms. The top and bottom of the box body are respectively provided with a liquid inlet and a liquid outlet; The first filter assembly and the second filter assembly are arranged sequentially along the direction from the liquid inlet to the liquid outlet.

6. The anaerobic-membrane bioreactor system according to claim 5, characterized in that, The first filtration assembly includes multiple filter plates; The plurality of filter plates are detachably connected to the housing body, and the plurality of filter plates are arranged along the height direction of the housing body, with a gap between adjacent filter plates; Along the direction from the liquid inlet to the liquid outlet, the filter holes of the plurality of filter plates gradually become smaller.

7. The anaerobic-membrane bioreactor system according to claim 5, characterized in that, The second filter assembly includes an S-shaped baffle and activated carbon strips; The S-shaped guide plate is detachably connected to the box body, and multiple activated carbon strips are installed between the S-shaped guide plate and the box body.

8. The anaerobic-membrane bioreactor system according to claim 1, characterized in that, The cleaning unit also includes a disinfectant dosing tank, which is connected to the cleaning water tank.

9. The anaerobic-membrane bioreactor system according to claim 1, characterized in that, The scale inhibitor dosing unit is filled with a scale inhibitor, which is an anaerobic scale inhibitor for inorganic salt scale and / or organic scale.

10. A cleaning method, characterized in that, The anaerobic-membrane bioreactor system according to any one of claims 1 to 9 comprises the following steps: The scale inhibitor dosing mechanism is used to add chemicals to the inlet pipe of the anaerobic reaction unit; Turn on the cleaning water pump and cleaning valve in the first circulation loop, and / or the cleaning water pump and cleaning valve in the second circulation loop, so that the liquid in the cleaning water tank circulates in the first circulation loop and / or the second circulation loop, or so that the liquid in the cleaning water tank flows sequentially through the outlet pipe of the first circulation loop, the anaerobic pipe, the anaerobic reaction unit, the membrane biological pipe, and the return pipe of the second circulation loop.

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