A breathable membrane element, a membrane biofilm reactor and components equipped therewith

Abstract

The present application discloses a breathable membrane element, a membrane biofilm reactor and a membrane biofilm reactor assembly equipped with the same. The membrane biofilm reactor is composed of a plurality of membrane elements fixed to a membrane frame and placed in a membrane box. The core component, the breathable membrane element, is composed of a plurality of woven membrane cloths spirally wound along a central core tube to form a radial woven layer outside the tube, wherein the membrane cloth is woven from a large number of hollow fiber membrane filaments and isolation filaments. Sewage is introduced into the central core tube, and gas is introduced into the inner cavity of the hollow fiber membrane for the growth of microorganisms on the outer surface of the hollow fiber membrane. Sewage flows out from the opening area of ​​the central core tube and contacts with the microorganisms on the outer surface of the hollow fiber membrane, thereby forming a radial flow. The highest possible packing density is achieved through a special weaving method, thereby greatly increasing the biomass attached to the outer surface of the hollow fiber membrane. On the other hand, the membrane biofilm system can be periodically backwashed to control the thickness of the biofilm through the fully automated operation of the automatic control program, effectively reducing the risk of membrane contamination and blockage.

Description

Technical Field

[0001] The present application relates to a membrane biofilm reactor, and in particular to an intelligent high-microbial-quantity breathable membrane element, a membrane biofilm reactor, and a membrane biofilm reactor assembly equipped therewith. Background Art

[0002] At present, the mainstream treatment methods for sewage treatment include activated sludge method, biofilm method and membrane separation technology. Although their mechanism and application are quite mature, they still have disadvantages such as high energy consumption and poor treatment effect in specific fields. For example, when the mainstream biochemical method is used for oxidation reaction, the energy waste is too great due to the extremely low utilization rate of dissolved oxygen; when carrying out reduction reactions such as denitrification, there is the problem of needing an external carbon source; and for the increasingly stringent sewage discharge standards, the above methods alone cannot achieve standard discharge.

[0003] The membrane biofilm reactor combines the biofilm method with the breathable membrane technology. The hollow fiber membrane component provides a habitat for microorganisms to attach and reproduce, thereby forming a biofilm. The huge surface area greatly increases the effective contact area between the biofilm and the pollutants in the sewage, thereby achieving a better purpose of removing pollutants. On the other hand, the membrane biofilm reactor can undergo oxidation or reduction reactions due to the different reactants introduced (H2, O2, etc.). After the gas is introduced into the hollow fiber cavity, it diffuses through the hollow fiber membrane wall and contacts with the microorganisms outside the membrane. The pollutants in the wastewater are oxidized or reduced to achieve the purpose of removing pollutants. And due to the special hollow fiber membrane structure, the utilization rate of the introduced gas is close to 100%, and the residual gas emission is small, which greatly reduces the operating cost.

[0004] Generally, membrane biofilm reactor devices operate well in laboratories and controlled test environments, but there are problems in sewage treatment. Under a certain membrane biofilm reactor volume and treatment time, high packing density can improve treatment efficiency, that is, increase the rate of pollutant removal. However, high packing density can cause biological clogging and require maintenance (such as backwashing, disassembly, cleaning, etc.), which in turn reduces the operating efficiency of the membrane biofilm reactor and increases operating costs. In addition, in actual use, hollow fiber membrane components will inevitably experience broken wires and membrane filament entanglement. During operation, due to subjective factors and different professional qualities of the operators, the uncertainty of human operation is too great, which ultimately undoubtedly causes an increase in operating costs.

[0005] Therefore, the improvement goals of membrane biofilm reactor devices and systems are to achieve the highest possible filling density, prevent wire breakage, membrane wire entanglement, prevent fouling, and achieve the most accurate energy consumption control. Summary of the invention

[0006] In order to overcome the above disadvantages, the object of the present application is to provide a membrane biofilm reactor with a high microbial count, which increases the packing density of the hollow fiber membrane to provide a larger specific surface area for microorganisms to attach.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions:

[0008] A breathable membrane element for a membrane biofilm reactor, characterized in that it comprises: a central core tube and a plurality of woven membrane fabrics,

[0009] The side wall of the central core tube is provided with at least one opening;

[0010] The membrane cloth includes a plurality of hollow fiber membrane yarns and spacer yarns.

[0011] The outer side of the central core tube is spirally wound with more than 2 layers of the membrane cloth, forming a radial woven layer on the outer side of the central core tube, and the membrane cloth part covers the opening, and the two ends of the central core tube are respectively provided with fixed end caps. Through such a design, the highest possible packing density is achieved, thereby greatly increasing the biomass attached to the outer surface of the hollow fiber membrane, avoiding the occurrence of broken wires and membrane wire entanglement. In one embodiment, the breathable membrane element, the outer side of the central core tube is wound with 6 or 8 layers of membrane cloth.

[0012] In one embodiment, the breathable membrane element for a membrane biofilm reactor is characterized in that it also includes a separation net, and the separation net is used to separate the membrane cloth.

[0013] In one embodiment, the hollow fiber membrane is connected with one or more spacer fibers and woven at a 90° angle.

[0014] In one embodiment, the hollow fiber membranes are arranged into groups and connected to the spacer fibers respectively, and each group includes 2 to 200 hollow fiber membranes.

[0015] In one embodiment, the hollow fiber membrane is made of cellulose triacetate (CTA), polyethylene, polypropylene, polyurethane or polyvinyl chloride, and has an outer diameter of 300 μm (there will be ±10% deviation in actual production) and an inner diameter of 150 μm (there will be ±10% deviation in actual production).

[0016] In one embodiment, the isolation filament is made of cellulose triacetate, polyester, polypropylene, polyethylene or polyurethane and a combination thereof, and has an outer diameter of 100-500 μm, 150-450 μm or 200-400 μm.

[0017] In one embodiment, the spacer filament includes 150 polyester fibers with an outer diameter of about 300 μm and an inner diameter of about 150 μm.

[0018] In one embodiment, the hollow fiber membrane has a weaving interval of 1-3 mm.

[0019] In one embodiment, the spacing between the isolation wires is 1-6 cm.

[0020] An embodiment of the present application provides a membrane biofilm reactor, characterized in that it includes a membrane box and at least one of the above-mentioned breathable membrane elements for a membrane biofilm reactor, wherein the breathable membrane element is fixed in the membrane box by a membrane frame.

[0021] The present application provides a membrane biofilm reactor assembly, which is characterized by comprising a membrane biofilm reactor and a control module.

[0022] The membrane biofilm reactor comprises a membrane box and at least one of the above-mentioned permeable membrane elements for the membrane biofilm reactor, wherein the permeable membrane element is fixed in the membrane box through a membrane frame.

[0023] A backwash component, the backwash component includes a compressed air pipe connected to a circulating water pipe, a membrane pressure sensor electrically connected to a control module, the membrane pressure sensor is used to detect the membrane pressure of the breathable membrane element, when the detected membrane pressure difference exceeds the set value, based on the control of the control module, the air / water backwash stage is entered to control the thickness of the biofilm. The membrane pressure sensor is located on the connecting pipe between the membrane box circulating water outlet and the central core tube, and is used to detect the membrane pressure of the breathable membrane element, when the detected membrane pressure difference exceeds the set value, based on the control of the control module, the air / water backwash stage is entered to control the thickness of the biofilm. In the backwash mode, air and circulating water are fully mixed and flow into the central core tube to backwash the membrane cloth, wherein the air-water ratio is between 6 and 9:1, the air pressure is 6 to 8 bar, and the air-water backwash time is 120 seconds each time to control the thickness of the biofilm between 100 and 200 μm.

[0024] In one embodiment, when the membrane biofilm reactor assembly is in operation, when the membrane pressure difference detected by the membrane pressure sensor exceeds a set value, the control module enters an air-water backwash mode to control the thickness of the biofilm.

[0025] In one embodiment, the membrane pressure difference setting value is between 3 and 10 psi. When the membrane pressure difference detected by the membrane pressure sensor exceeds the set value, the air pipeline valve is opened based on the control of the control module, the inlet / outlet water valve is closed to stop the water inlet and outlet, and the backwash mode is automatically entered. In the backwash mode, the air and circulating water are fully mixed and flow into the central core tube to backwash the membrane cloth, wherein the air-water ratio is between 6 and 9:1, the air pressure is 6 to 8 bar, and the air-water backwash time is between 90 and 150 seconds each time to maintain the biofilm thickness between 100 and 200 μm.

[0026] In one embodiment, the control module includes: a communication module, which is connected to a remote monitoring terminal, the control module and the monitoring terminal exchange information, and the control module controls the operation of the membrane biofilm reactor component based on a preset operation mode during operation, and the operation parameter information is transmitted to the monitoring terminal or the monitoring terminal and the cloud server in real time through the communication module.

[0027] Based on the monitoring end, the membrane biofilm reactor components are monitored in real time.

[0028] In one embodiment, the control module includes: a human-machine interface, and the human-machine interface is configured with:

[0029] The first button is triggered, and the membrane biofilm reactor assembly enters a first operation mode. In the first operation mode, the membrane biofilm reactor assembly automatically operates based on preset parameters.

[0030] The second button is triggered, and the membrane biofilm reactor assembly enters the second operation mode, in which the membrane biofilm reactor assembly stops operating.

[0031] Beneficial Effects

[0032] The membrane biofilm reactor proposed in this application adopts a new special membrane element weaving method to solve the inevitable phenomenon of broken wires and membrane wire entanglement of hollow fiber membranes during actual use. At the same time, it has a high packing density under a certain membrane biofilm reactor volume, thereby providing more attachment for microorganisms. During operation, the reactor adopts a radial flow pattern of treated water in the reactor so that the attached microorganisms can make full use of the nutrients in the water to form a stable biofilm. Based on the setting of the automatic control program of the control module, the membrane biofilm system is periodically backwashed to control the biofilm at a reasonable thickness, effectively reducing the risk of membrane contamination and blockage, stabilizing the effluent water quality, and achieving precise energy consumption control. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is the weaving method of the hollow fiber membrane filaments and the isolation filaments in the embodiment of the present application.

[0034] Figure 2 This is an expanded view of the hollow fibers, isolation fibers and isolation nets of the breathable membrane assembly of an embodiment of the present application.

[0035] Figure 3 This is a cross-sectional view of a membrane biofilm reactor according to an embodiment of the present application.

[0036] Figure 3a This is a three-dimensional structural diagram of the membrane biofilm reactor according to an embodiment of the present application.

[0037] Figure 4This is a process flow chart of the membrane biofilm reactor according to an embodiment of the present application.

[0038] In the figure:

[0039] 1-Compression device; 2-Membrane box; 3-Membrane box water inlet pipe; 4-Membrane air inlet system; 5-Membrane air outlet pipe; 6-Membrane H 2 system; 7-membrane element; 8-membrane assembly water inlet pipe; 9-membrane box circulation water inlet; 10-membrane frame; 11-membrane box water outlet; 12-isolation net; 13-membrane cloth; 14-central core tube opening; 15-central core tube; 16-membrane shell end cover; 17-externally threaded stainless steel connector; 18-membrane air outlet; 19-hollow fiber membrane filament; 20-isolation filament. DETAILED DESCRIPTION

[0040] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present application and are not limited to the scope of the present application. The implementation conditions adopted in the examples can be further adjusted as the conditions of the specific manufacturer, and the unspecified implementation conditions are usually the conditions in conventional experiments.

[0041] The embodiment of the present application proposes a breathable membrane element (also called membrane element), a membrane biofilm reactor and a (membrane biofilm reactor) component equipped with the same. The membrane element is configured with a central core tube and a plurality of membrane cloths, and at least one opening is configured on the side wall of the central core tube; the membrane cloth includes a plurality of hollow fiber membrane filaments and isolation filaments, and the outer side of the central core tube is spirally wound with more than two layers of the membrane cloth and part of the membrane cloth covers the opening to form a radial braided layer, and the two ends of the central core tube are respectively configured with fixed end caps. The reactor includes a membrane box, a plurality of breathable membrane elements configured in the membrane box, and preferably, the membrane element is fixed in the membrane box by a membrane frame. The breathable membrane element includes a central core tube, the side wall of the central core tube is configured with an opening, and a membrane cloth. The outer side of the central core tube is composed of a plurality of woven membrane cloths spirally wound along the central core tube outside the tube to form a radial braided layer, and the membrane cloth includes a plurality of hollow fiber membrane filaments and isolation filaments. When the membrane biofilm reactor is in operation, the sewage to be treated is introduced into the central core tube, and the gas (such as hydrogen) is introduced into the inner cavity of the hollow fiber membrane for the growth of microorganisms on the outer surface of the hollow fiber membrane. The sewage flows out from the opening area of ​​the central core tube and contacts with the microorganisms on the outer surface of the hollow fiber membrane, thus forming a radial flow. This structural design achieves the highest possible packing density, thereby greatly increasing the biomass attached to the outer surface of the hollow fiber membrane.

[0042] Next, please refer to the drawings to describe in detail the breathable membrane element and membrane biofilm reactor according to the embodiments of the present application.

[0043] like Figure 1-Figure 2The present invention shows a breathable membrane element for a membrane biofilm reactor according to an embodiment of the present invention. The membrane element is provided with a central core tube and a plurality of membrane cloths, and the membrane cloths are woven with hollow fiber membrane filaments and isolation filaments. The hollow fiber membrane filaments 19 and the raw material polyester fiber isolation filaments 20 are woven alternately at perpendicular angles to each other. The hollow fiber membrane filaments 19 are woven at intervals of 1 to 3 mm, and the isolation filaments 20 are woven at intervals of 1 to 6 cm. The two are woven by resin bonding, and finally woven to form a hollow fiber membrane cloth, and the hollow fiber membrane filaments of the formed membrane cloth are sealed with resin. In one embodiment, the hollow fiber membrane filaments 19 can be arranged in groups and connected to the isolation filaments 20, and each group includes about 2 to 200 hollow fiber membrane filaments 19. The material of the hollow fiber membrane filaments can be polypropylene.

[0044] See also Figure 2 To describe the assembly of the membrane element, the membrane element includes a central core tube 15, a plurality of membrane cloths 13, a plurality of isolation nets 12 and two end caps 16. The breathable membrane element is composed of multiple layers (such as 8 layers) of hollow fiber membrane cloth 13 spirally wound along the central core tube 15 to form a radial woven layer outside the tube. There is an isolation net 12 between each layer of membrane cloth 13. The central core tube 15 is configured to be hollow, and a perforated area is provided on the tube wall. The perforated area is provided with one or more openings 14. After the membrane cloth is wound, the perforated area should be exactly within the membrane cloth wrapping; the central core tube is open at one end and closed at the other end, and the open end is sealed with the membrane element end cap 16 / 16a. Each hollow fiber filament 19 contains an inner cavity, an outer wall and two open ends. The two ends of the hollow fiber filament in the middle of the box body are respectively sealed with the two end caps 16 / 16a of the membrane shell. One end of the end cap 16a is equipped with an inlet H 2 The system 6 and the membrane module water inlet pipe 8, the end cap 16 at the other end is equipped with a remaining H 2 The air outlet 18 and the external threaded stainless steel connector 17 for fixing. The hollow fiber membrane can increase the effective contact area between the biofilm and the pollutants in the sewage to enhance the metabolism; the special membrane element weaving method can make it have a high packing density under a certain membrane biofilm reactor volume, thereby providing more attachment points for microorganisms; the special membrane element weaving method solves the inevitable breakage and entanglement of hollow fiber membrane filaments during actual use; the radial flow pattern enables the attached microorganisms to fully utilize the nutrients in the water to form a stable biofilm. Resin is used to seal the hollow fiber membrane filaments that form the membrane cloth. In this embodiment, there is a separation net 12 between each layer of membrane cloth. The separation net refers to a porous, continuous flat material composed of a flat grid made of recyclable plastic, which is used to separate and maintain the hollow fiber space.

[0045] In one embodiment, the membrane cloth is formed by weaving a plurality of hollow fiber membrane threads connected to one or more spacer threads and forming a 90° angle.

[0046] In one embodiment, the hollow fiber membrane filaments can be arranged in groups and connected to the isolation filaments, each group including about 2 to 200 hollow fiber membrane filaments. Preferably, the hollow fiber is made of cellulose triacetate (CTA), polyethylene, polypropylene, polyurethane or polyvinyl chloride, with an outer diameter of about 300 μm and an inner diameter of about 150 μm. Preferably, the isolation filament has a certain elasticity and can be contracted and stretched; its material is selected from cellulose triacetate, polyester, polypropylene, polyethylene or polyurethane and their compounds. The outer diameter of the isolation filament should be between 100 and 500 μm or 150 and 450 μm or 200 and 400 μm. Preferably, the isolation filament is 150 polyester fiber with an outer diameter of about 300 μm and an inner diameter of about 150 μm. The braiding interval of the hollow fiber membrane filament is 1 to 3 mm. The braiding interval of the isolation filament is 1 to 6 cm, and its supporting force is the key factor in fixing the hollow fiber, which minimizes the turning and deviation of the hollow fiber in actual operation, while being able to contract and stretch. To reduce the occurrence of wire breakage.

[0047] The embodiment of the present application proposes a membrane biofilm reactor, which includes at least two breathable membrane elements (also called membrane elements). The membrane element is arranged in a membrane box through a membrane frame. When used, sewage is introduced into the central core tube, and gas is introduced into the inner cavity of the hollow fiber membrane for the growth of microorganisms on the outer surface of the hollow fiber membrane. The sewage flows out from the opening area of ​​the central core tube and contacts the microorganisms on the outer surface of the hollow fiber membrane, thereby forming a radial flow. The radial flow pattern enables the attached microorganisms to fully utilize the nutrients in the water to form a stable biofilm. The parallel combination of membrane elements used in the embodiment of the present application provides an advantage for forming a high biomass membrane biofilm reactor. In one embodiment, see the schematic diagram Figure 4, 4 sets of breathable membrane elements are arranged in the membrane box, and the 4 sets of breathable membrane elements are fixed vertically on the membrane frame in parallel (for example, 2 sets are fixed vertically on the membrane frame in parallel), and the membrane frame is arranged in the box (also called the membrane pool), which provides more microbial attachment points. In practical applications, the appropriate number of membrane elements can be selected according to the water quality requirements. During operation, the sewage to be treated enters the membrane pool from the water inlet storage tank through the water inlet centrifugal pump, and then enters the membrane biofilm reactor at one end and flows into the central core tube, and the gas enters the hollow fiber membrane cavity from the air inlet on the membrane shell end cover at the same end, and the excess gas is discharged from the air outlet on the membrane shell end cover at the other end. The sewage is introduced into the central core tube, and the gas is introduced into the hollow fiber cavity for the growth of microorganisms on the outer surface of the hollow fiber. The sewage flows out from the opening area of ​​the central core tube and contacts the microorganisms on the outer surface of the hollow fiber, thereby forming a radial flow. The radial flow pattern enables the attached microorganisms to make full use of the nutrients in the water to form a stable biofilm. The final treated water is discharged through the drain at the bottom of the membrane box. The gases passing through the inner cavity of the hollow fiber are hydrogen and carbon dioxide, and can also be air / oxygen depending on the treatment target. When flammable H2 is used as the reducing gas, the gas utilization rate is close to 100%, and the residual gas emission is small. In other embodiments, H2 or O2 or air can be introduced into the system for reaction according to different influent water quality and treatment requirements.

[0048] The embodiment of the present application proposes a membrane biofilm reactor assembly, which includes the membrane biofilm reactor, a backwash assembly and a control module proposed in the application.

[0049] The backwash assembly includes an air compressor system, which is electrically connected to the control membrane. Based on the command action of the control module, the output of the air compressor system is connected to a compressed air pipe, which is connected to the circulating water pipe;

[0050] The membrane pressure sensor is electrically connected to the control module. The membrane pressure sensor is located on the pipe connecting the membrane box circulation water outlet and the central core tube. It is used to detect the membrane pressure of the breathable membrane element. When the detected membrane pressure difference exceeds the set value, the control module enters the air / water backwash stage to control the thickness of the biofilm. Figure 2 and Figure 3 and Figure 3aTo describe the membrane biofilm reactor assembly, the membrane element 7 is placed vertically in the membrane box 2, and the membrane element 7 is fixed to the membrane frame 10 through the bottom external thread stainless steel joint 17, and then compressed by the clamping device 1. Membrane box water inlet pipe 3; membrane air inlet system 4; membrane outlet pipe 5; membrane H2 system 6; membrane element 7; membrane assembly water inlet pipe 8; membrane box circulating water inlet 9; membrane box water outlet 11; membrane outlet 18; During operation, the sewage to be treated flows into the membrane box from the membrane box water inlet pipe 3, and the sewage flows into the central core tube from one end of the membrane biofilm reactor, and the gas enters the inner cavity of the hollow fiber membrane from the membrane inlet H2 system inlet 6 on the membrane shell end cover on the same end side (not shown), and the remaining gas is discharged from the outlet 18 on the other end membrane shell end cover. In this embodiment, the gas passing through the inner cavity of the hollow fiber is hydrogen and carbon dioxide, and it can also be air / oxygen according to different treatment targets. The treated water flows out through the membrane box outlet 11. Preferably, part of the treated water flowing out through the membrane box water outlet 11 flows back into the membrane box through the membrane box circulation water outlet 9 .

[0051] In one embodiment, the process flow of the membrane biofilm reactor assembly is shown in Figure 4 (The membrane elements are arranged in groups of two (at this time, the membrane elements are also called membrane assemblies), which are fixed vertically and side by side on the membrane frame, which is fixed in the membrane pool of the box body, and the membrane pressure sensor is arranged on the outlet pipe of the membrane pool circulation pump, not shown in the figure). The membrane frame is arranged in the box body (also called the membrane pool, and each membrane pool is equipped with a membrane pressure sensor), which provides more microbial attachment points. During operation, the sewage to be treated enters the membrane pool from the inlet water storage tank through the inlet water centrifugal pump, and the reagent is sent into the membrane pool through the phosphate tank through the metering pump. The treated water is output (outlet water) through the outlet water storage tank through the external centrifugal pump. The membrane biofilm system is backwashed based on the information detected by the membrane pressure sensor (the air compressor is running, and the air and water are used for backwashing) or the membrane biofilm system can be backwashed periodically based on the automatic control program (the air compressor is running, and the air and water are used for backwashing), so as to control the reasonable thickness of the biofilm.

[0052] In one embodiment, the control module is electrically connected to the human-machine interface, so that when the membrane biofilm biofilm reactor assembly is in operation, the interface operation such as "one-key full-automatic" button and "one-key emergency stop" button are used for automatic control. In this way, the target sewage to be treated is connected to the membrane box water inlet pipe 3 through a pipeline, so that the sewage flows into the membrane box 2, and then 40-50% of the sewage is pumped out through the membrane box circulating water port 9 and pumped into the membrane assembly water inlet pipe 8 to contact the biofilm on the outer surface of the hollow fiber membrane, and at the same time, the H inlet 2 System 6 introduces H into the hollow fiber membrane 2 The reaction proceeds, and the remaining H 2The treated water is discharged through the membrane element outlet pipe 5, and the treated water is discharged through the membrane box outlet 11. When the system membrane pressure difference exceeds the set value of 3 to 10 psi, the membrane element needs to be backwashed. At this time, the air compressor system is turned on based on the control of the control module. The air compressor works to allow air to pass through the membrane air inlet system 4 and enter the central core tube 15 together with the circulating water to form a relatively high pressure air / water backwash flow (the compressed air and the circulating water are fully mixed and then enter the central core tube to backwash the membrane. The circulating water inlet of the device is also the flushing air inlet). The air / water flowing into the central core tube 15 flows out through the opening 14 of the central core tube. While the air / water flows out, the biofilm on the membrane surface is scrubbed at a high speed to remove aging microorganisms, thereby achieving the purpose of reducing the thickness of the biofilm. In this embodiment, the circulating water accounts for 40% to 50% of the discharged water. A CO2 gas pipe is connected to the circulating water pipe, and CO2 needs to be introduced at the same time when the system pH fluctuates. 2 Adjust. Preferably, the air / water ratio of air / water backwash is 6 to 9:1 (such as 9:1), and the air pressure is 6 to 8 bar. Preferably, the membrane pressure difference setting value is between 3 and 10 psi. When the membrane pressure difference exceeds the setting value, the system opens the air pipeline valve through the control program, stops the inlet and outlet water, and automatically enters the backwash stage. Preferably, the air-water backwash (air / water backwash) time is 120s each time to maintain the biofilm thickness between 100 and 200 μm. In this embodiment, the control module includes a PLC control system (the PLC control system connects various online instruments, inlet / outlet valves, regulating valves and frequency converters configured on site, collects data of various instruments required in the system, and realizes the full-automatic operation control of the membrane biofilm biofilm reactor system according to the set operating parameters and logical relationships), which is connected to the video online monitoring system and the intelligent Internet of Things communication system. In this way, the membrane biofilm reactor component realizes the automation-informatization-intelligent operation control of the membrane biofilm reactor component when it is running, and can realize intelligent and precise control, so that the system operation is more low-consumption and efficient. The video monitoring system based on standard network, mobile broadband and other protocols can be directly connected through LAN, DSL connection or wireless network adapter to realize real-time monitoring of the operating conditions and surrounding working environment of the entire system, and can store data in the cloud, support retrieval, backup, playback and other operations, and can realize 7*24 hours online monitoring of the operating conditions of the entire system through PC and mobile phone APP. In one embodiment, when the membrane pressure difference still exceeds the set value after gas-water backwashing, the system alarm prompts that the membrane assembly needs to be disassembled for offline cleaning. Through intelligent control of regular gas-water backwashing, the thickness of the biofilm can be reasonably controlled to prevent membrane fouling. In this embodiment, a part of the discharged water of the membrane biofilm reactor assembly is circulated back to the assembly during backwashing, and the circulating water accounts for 40% to 50% of the discharged water. The CO2 air pipe is connected to the circulating water pipe, and the CO2 air pipe is connected to the system pH when the pH fluctuates and CO2 needs to be introduced at the same time for pH adjustment.

[0053] In one embodiment, the membrane biofilm reactor component adopts a special structure that enables the attached microorganisms to fully utilize the nutrients in the water to form a stable biofilm. The growth of the biofilm in long-term operation is bound to lead to a decrease in membrane flux. Therefore, the control module is used to periodically backwash the membrane biofilm system based on a preset self-control program, thereby controlling the biofilm to a reasonable thickness, effectively reducing the risk of membrane contamination and blockage, stabilizing the effluent water quality, and achieving precise energy consumption control.

[0054] An embodiment of the present application provides a membrane biofilm biofilm reactor component with a high microbial count. The component operates according to a preset mode based on a configured control module, and can also backwash the membrane biofilm system based on the detection results of a membrane pressure sensor configured in the box, thereby controlling the reasonable thickness of the biofilm, effectively reducing the risk of membrane contamination and clogging, while also achieving the purpose of precise energy consumption control.

[0055] Example 1

[0056] This implementation case uses reducing gas hydrogen as a denitrification electron donor to treat total nitrogen in sewage. The water quality of the sewage to be treated is: pH: 7-9, with an average value of 8; nitrate nitrogen: 8-11 mg / L, with an average value of 10 mg / L; temperature = 25-35°C, with an average value of 28°C. Influent water volume Q = 2m 3 / h, the effluent quality after treatment is: pH: 7-8.0; nitrate nitrogen: 1-1.5 mg / L, with an average value of 1.2 mg / L; H 2 :NO 3 -N=3:1 (molar ratio), the whole system operates stably, and the total nitrogen in the effluent is ≤1.5mg / L, which meets the total nitrogen emission requirements of surface quasi-Class IV.

[0057] Example 2

[0058] This implementation case uses oxidizing air to aerate and oxidize organic matter in municipal sewage, thereby achieving the purpose of removing organic pollutants.

[0059] Influent water quality: pH: 7-9, average value is 8; COD: 300-600 mg / L, average value is 500 mg / L; ammonia nitrogen: 20-30 mg / L; temperature is between 25-35°C, average value is 28°C. Influent water volume Q=100m 3 / h, the effluent quality after treatment is: pH: 7-8.0; COD: 30-50mg / L, with an average value of 40mg / L; ammonia nitrogen: ≤5mg / L; the whole system operates stably, and the effluent meets the relevant standard requirements.

[0060] An embodiment of the present application provides a membrane biofilm reactor assembly with a high microbial count. The self-control program based on the control module can periodically backwash the membrane biofilm system, thereby controlling the reasonable thickness of the biofilm, effectively reducing the risk of membrane contamination and clogging, and also achieving the purpose of precise energy consumption control.

[0061] An embodiment of the present application provides an intelligent high-microbial biomass membrane biofilm reactor component (hereinafter referred to as membrane biofilm reactor component), which includes a control module and a communication module. During the operation process, the parameter information of the control operation based on the control module (such as, the control module includes a PLC control program) is connected to the remote monitoring terminal in real time through the communication module (such as an IOT module, LAN, DSL or wireless network adapter), so that the parameter information of the membrane biofilm reactor component during operation is transmitted to the monitoring terminal in real time, and the operating conditions of the entire component system and the surrounding working environment are monitored in real time. The data can be stored in the cloud, and operations such as retrieval, backup, playback and viewing can be supported. The operating conditions of the entire system can be monitored online 24 hours a day through the PC terminal and mobile phone APP. The automation of the component system, the informatization of the system operation, and the intelligence are realized. Preferably, the monitoring terminal is configured with a display module, so that the operating information of the entire membrane biofilm reactor component is displayed in real time, and the automation and information visualization of the operation of the membrane biofilm reactor component are realized.

[0062] An embodiment of the present application provides a membrane biofilm reactor component, which is configured with a human-machine interface, and the human-machine interface is configured with: a first button, when the first button is triggered, the membrane biofilm reactor component enters a first operating mode, in which the membrane biofilm reactor component automatically operates based on preset parameters (i.e., one-key full-automatic operation), a second button, when the second button is triggered, the membrane biofilm reactor component enters a second operating mode, in which the membrane biofilm reactor component stops operating (i.e., one-key emergency stop). Preferably, the remote monitoring end is also configured with the same first button and second button, so that the component can be remotely controlled after it is turned on.

[0063] In this application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0064] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with the technology to understand the content of the present application and implement it accordingly, and they cannot be used to limit the protection scope of the present application. Any equivalent transformation or modification made according to the spirit of the present application shall be included in the protection scope of the present application.

Claims

1. A breathable membrane element for a membrane biofilm reactor, Features ,include: Central core tube and multiple woven membranes. The side wall of the central core tube is provided with at least one opening; The membrane cloth includes a plurality of hollow fiber membrane filaments and isolation filaments, which are connected by a plurality of hollow fiber membrane filaments and one or more isolation filaments and woven at a 90° angle. The weaving interval of the hollow fiber membrane filaments is 1-3 mm, and the weaving interval of the isolation filaments is 1-6 cm. The isolation filaments are made of cellulose triacetate, polyester, polypropylene, polyethylene or polyurethane and their compounds, and their outer diameters are between 100 and 500 μm, 150 and 450 μm or 200 and 400 μm. More than two layers of the membrane cloth are spirally wound around the outer side of the central core tube, forming a radial woven layer on the outer side of the central core tube. The membrane cloth part covers the opening, and fixed end caps are respectively provided at both ends of the central core tube.

2. The gas permeable membrane element for a membrane biofilm reactor according to claim 1, Features The hollow fiber membrane is made of cellulose triacetate, polyethylene, polypropylene, polyurethane or polyvinyl chloride, with an outer diameter of 300 μm and an inner diameter of 150 μm.

3. A membrane biofilm reactor, Features , comprising a membrane box and at least one breathable membrane element for a membrane biofilm reactor as described in claim 1 or 2, wherein the breathable membrane element is fixed in the membrane box by a membrane frame.

4. The membrane biofilm reactor according to claim 3, Features , four sets of the breathable membrane elements are arranged in the membrane box, and the four sets of the breathable membrane elements are arranged in parallel and vertically arranged on the membrane frame.

5. A membrane biofilm reactor assembly, Features , including: membrane biofilm reactor, control module and backwash components, The membrane biofilm reactor includes: a membrane box and at least one breathable membrane element for a membrane biofilm reactor as described in claim 1 or 2, wherein the breathable membrane element is fixed in the membrane box by a membrane frame, and the backwash component includes a compressed air pipe connected to a circulating water pipe, a membrane pressure sensor electrically connected to a control module, and the membrane pressure sensor is used to detect the membrane pressure of the breathable membrane element. The control module controls the operation of the membrane biofilm reactor component based on a preset operating mode. When the membrane pressure difference detected by the membrane pressure sensor exceeds a set value, the control module enters an air-water backwash mode to control the thickness of the biofilm.

6. The membrane biofilm reactor assembly according to claim 5, It is characterized in that The membrane pressure difference setting value is between 3 and 10 psi. When the membrane pressure difference detected by the membrane pressure sensor exceeds the setting value, the air pipeline valve is opened and the inlet / outlet valve is closed to stop the water inlet and outlet based on the control of the control module, and the backwash mode is automatically entered.

7. The membrane biofilm reactor assembly according to claim 5, It is characterized in that The control module includes: a communication module, which is connected to a remote monitoring terminal, and the control module exchanges information with the monitoring terminal. During operation, the control module controls the operation of the membrane biofilm reactor component based on a preset operation mode, and the operation parameter information is transmitted to the monitoring terminal or the monitoring terminal and the cloud server in real time through the communication module. Based on the monitoring end, the membrane biofilm reactor components are monitored in real time.

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