An anaerobic membrane bioreactor system for treating high-salinity wastewater and a method of using the same

Abstract

The present application relates to wastewater treatment technical field, particularly to a kind of processing high-salinity wastewater anaerobic membrane bioreactor system and its application method, including anaerobic tank, water inlet pipeline, water supplement device and sludge outlet pipe;It also includes biological membrane layer, three-phase separator, gas collection pipe, ceramic filter device, steam-water separation tank and gas outlet pipe, biological membrane layer, three-phase separator and ceramic filter device are installed in anaerobic tank, steam-water separation tank is installed in the top of anaerobic tank, the inside of biological membrane layer is filled with spherical polyethylene filler, the lower end of gas collection pipe is connected with three-phase separator, the upper end of gas collection pipe is inserted into the gas storage chamber of steam-water separation tank, ceramic filter device is filled with ceramic filler inside, water drain pipe is installed on anaerobic tank, and water drain pipe is located above ceramic filter device;It is suitable for high-salinity wastewater, by the synergistic effect of biological membrane layer, three-phase separator and ceramic filter device, resistant to salinity fluctuation, stable operation, lower cost, good practicability.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to an anaerobic membrane bioreactor system for treating high-salinity wastewater and its application method. Background Technology

[0002] High-salinity wastewater is typically treated using anaerobic membrane bioreactor systems. Various anaerobic membrane bioreactor systems are disclosed in the prior art. For example, Chinese invention patent application CN118851421A proposes an anaerobic membrane bioreactor for mitigating membrane fouling. This anaerobic membrane bioreactor includes a reactor body, a gas collection and sealing hood, and a gas recovery and recirculation assembly. The reactor body performs anaerobic biological reactions and membrane separation. The gas collection and sealing hood collects biogas produced by the anaerobic reaction and discharges it to the gas recovery and recirculation assembly outside the reactor body. The gas recovery and recirculation assembly stores the biogas collected by the gas collection and sealing hood and recirculates a portion of the biogas back into the reactor body to flush the membrane modules inside the reactor body that perform membrane separation. In this invention, the anaerobic reaction and membrane separation in the reactor are separated from each other. The upward flow rate of the wastewater ensures healthy growth of anaerobic microorganisms and reduces the adverse effects of aeration on microbial growth. The low sludge concentration in the membrane separation chamber reduces sludge adsorption on the membrane module surface and slows down membrane fouling. Furthermore, the biogas generated by the reactor itself is used to flush the membrane module, which reduces energy consumption and further slows down membrane fouling.

[0003] However, the aforementioned traditional anaerobic treatment systems are easily inhibited in high-salt environments, and the activity of microorganisms decreases due to the salting-out effect, which also reduces COD removal efficiency. Moreover, existing reverse osmosis membrane technology requires frequent cleaning due to salt crystallization contamination, resulting in poor operational stability. Evaporation technology is also costly. Furthermore, existing biochemical systems are difficult to operate continuously under high salinity conditions and have insufficient tolerance to inhibitory substances such as heavy metals and ammonia nitrogen. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides an anaerobic membrane bioreactor system for treating high-salinity wastewater and its application method. This system is suitable for high-salinity wastewater and, through the synergistic effect of the biofilm layer, three-phase separator, and ceramic filter, exhibits good tolerance to salinity fluctuations, stable operation, lower cost, and high practicality.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides an anaerobic membrane bioreactor system for treating high-salinity wastewater, comprising an anaerobic tank, an inlet pipeline, a water supply device, and a sludge discharge pipe. The anaerobic tank has a treatment chamber inside. The water supply device is installed at the output end of the inlet pipeline and is located at the bottom of the treatment chamber of the anaerobic tank. The sludge discharge pipe is installed on the side wall of the anaerobic tank and communicates with the bottom of the treatment chamber. The system also includes a biofilm layer, a three-phase separator, a gas collection pipe, a ceramic filter, a gas-liquid separator, and a gas outlet pipe. The biofilm layer, three-phase separator, and ceramic filter are installed in the treatment chamber of the anaerobic tank. The gas-liquid separator is installed at the top of the anaerobic tank and has a gas storage chamber inside. A gas outlet pipe communicating with the gas storage chamber is installed on the gas-liquid separator. The biofilm layer is located above the water supply device, and its interior is filled with spherical polymers. Ethylene packing and spherical polyethylene packing are used to immobilize the halophilic methanogen biofilm. A three-phase separator is located above the biofilm layer. The lower end of the gas collection pipe is connected to the three-phase separator, and the upper end of the gas collection pipe extends into the gas storage chamber of the gas-water separator. The three-phase separator causes sludge to settle. Methane produced by the halophilic methanogen biofilm is input into the gas storage chamber of the gas-water separator through the gas collection pipe and discharged through the gas outlet pipe. A ceramic filter is located above the three-phase separator and is filled with ceramic packing. A drain pipe is installed on the anaerobic tank and is located above the ceramic filter. The spherical hydrophilic modified polyethylene packing filled in the biofilm layer has a porosity of ≥90% and a pore size of 2-3 mm, and is used to immobilize the halophilic methanogen biofilm. The ceramic filter is filled with ceramic packing with a pore size of 50 μm.

[0007] Preferably, the system also includes a backwash pipe, a liquid level and pressure sensor, and a high-pressure pipe. The lower end of the backwash pipe extends into the ceramic filter device, and a solenoid valve is installed at the upper end of the backwash pipe, which extends into the gas storage chamber of the gas-water separator. The liquid level and pressure sensor is installed on the gas-water separator and is used to detect the pressure and liquid level in the gas storage chamber. The high-pressure pipe is installed on the gas-water separator and is connected to the gas storage chamber. During operation, gases such as methane and water vapor are input into the gas storage chamber of the gas-water separator through the gas collection pipe. A condenser is installed in the gas-water separator. The device condenses water vapor into liquefaction in the gas storage chamber of the steam-water separator. The condensate is stored at the bottom of the gas storage chamber. A liquid level and pressure sensor detects the liquid level of the condensate. When the liquid level reaches a threshold, high-pressure air is introduced into the gas storage chamber of the steam-water separator through a high-pressure pipe. When the pressure value detected by the liquid level and pressure sensor reaches the threshold, the solenoid valve on the backwash pipe automatically opens, allowing the condensate to flow down into the ceramic filter device through the backwash pipe to backwash the ceramic packing. This achieves automatic backwashing of the ceramic packing in the ceramic filter device, maintaining the filtration effect of the ceramic packing.

[0008] Preferably, it also includes a polymer membrane and an upper gas collecting pipe. The polymer membrane is installed in the upper part of the treatment chamber of the anaerobic tank and is located above the drain pipe. The upper end of the upper gas collecting pipe extends into the gas storage chamber of the gas-liquid separator, and the lower end of the upper gas collecting pipe extends into the upper part of the treatment chamber of the anaerobic tank. The lower end of the upper gas collecting pipe is located above the polymer membrane. The polymer membrane covers the liquid surface of the high-salt wastewater, allowing residual methane gas in the high-salt wastewater between the ceramic filter and the polymer membrane to permeate through the polymer membrane to the top of the treatment chamber of the anaerobic tank and then into the gas storage chamber of the gas-liquid separator through the upper gas collecting pipe, thereby improving the methane gas collection efficiency.

[0009] Preferably, the three-phase separator includes a mud baffle, a filter plate, and a gas collecting hood. The mud baffle is inverted conical and is installed in the middle of the treatment chamber of the anaerobic tank. The edge of the mud baffle is connected to the inner wall of the anaerobic tank. A rising opening is provided in the middle of the mud baffle, and the filter plate is installed in the rising opening of the mud baffle. The gas collecting hood is installed above the mud baffle and is also inverted conical. A downward flow channel is provided between the gas collecting hood and the mud baffle. The lower end of the gas collection pipe is connected to the top of the gas collecting hood. A wastewater channel is provided between the edge of the gas collecting hood and the inner wall of the anaerobic tank. The taper of the mud baffle and the gas collecting hood is 55°. After passing through the biological... The biodegradable high-salt wastewater flows upward and is collected by the mud baffle and then initially filtered by the filter plate. The sludge particles in the high-salt wastewater are intercepted by the mud baffle and the filter plate and settle to the bottom of the treatment chamber of the anaerobic tank. The pre-filtered high-salt wastewater is collected by the gas collection hood, which causes the methane gas in the high-salt wastewater to accumulate at the top of the gas collection hood and then enter the gas storage chamber of the gas-water separator through the gas collection pipe. At the same time, the pre-filtered high-salt wastewater flows upward along the downstream channel and the wastewater channel between the mud baffle and the gas collection hood, realizing efficient gas-liquid-solid three-phase separation of the biodegradable high-salt wastewater.

[0010] Preferably, the device also includes multiple sludge discharge holes and multiple sludge discharge pipes. Multiple sludge discharge holes are circumferentially arranged at the lower edge of the baffle hood, and the multiple sludge discharge holes are located below the gas collecting hood. Multiple sludge discharge pipes are installed in the multiple sludge discharge holes, and the lower ends of the multiple sludge discharge pipes extend into the lower part of the baffle hood and face the filter plate. The sludge particles that fall down after the ceramic packing in the ceramic filter device are backflushed fall down along the gas collecting hood and accumulate at the upper edge of the baffle hood. The sludge falls again to the bottom of the treatment chamber of the anaerobic tank through the multiple sludge discharge pipes. Since the multiple sludge discharge holes are blocked by the gas collecting hood, and the lower ends of the multiple sludge discharge pipes face the filter plate, the lower ends of the multiple sludge discharge pipes are needle-shaped, and the lower ends of the multiple sludge discharge pipes are blocked by the needle-shaped tips, thereby preventing the sludge in the rising high-salt wastewater from rising through the sludge discharge pipes. In addition, a small amount of methane gas in the high-salt wastewater is gathered again by the gas collecting hood after passing through the multiple sludge discharge pipes, thereby improving the efficiency of three-phase separation.

[0011] Preferably, it also includes a rotating shaft and an impeller. The rotating shaft is rotatably installed in the filter plate, and the impeller is installed at the lower end of the rotating shaft. The impeller is provided with multiple spiral blades, which scrape the lower end face of the filter plate. When the rising high-salt wastewater flows upward through the filter plate, it pushes the impeller and the rotating shaft to rotate, so that the spiral blades scrape the filter plate and prevent the filter holes of the filter plate from becoming clogged.

[0012] Preferably, the device also includes magnetic materials, electromagnetic components, and an electromagnetic controller. Magnetic materials are added to the spherical polyethylene packing particles filled in the ceramic filter. The electromagnetic components are installed on the biofilm layer, and the electromagnetic controller is installed on the anaerobic tank. The electromagnetic controller is electrically connected to the electromagnetic components. The magnetic materials are magnetic powders or granules, which cause the spherical polyethylene packing particles filled in the ceramic filter to adsorb and clump together, making the spherical polyethylene packing more stable and allowing magnetic pollutants in the high-salt wastewater to be adsorbed and removed. The electromagnetic controller supplies varying current and voltage to the electromagnetic components, causing the electromagnetic components to generate varying magnetic fields. These varying magnetic fields interact with the magnetic materials in the spherical polyethylene packing particles, causing the spherical polyethylene packing particles to vibrate. This vibrates out the sludge from the pores of the spherical hydrophilic modified polyethylene packing filled in the biofilm layer, maintaining the biodegradation efficiency of the spherical hydrophilic modified polyethylene packing filled in the biofilm layer.

[0013] Preferably, the system also includes a water seal tank, a purified gas pipe, a three-way valve, a branch pipe, a mixing controller, an oxidant pipe, a mixing pipe, a catalytic oxidizer, and a by-product pipe. The water seal tank is installed on the anaerobic tank, and a purification chamber is set inside the water seal tank. The output end of the gas outlet pipe extends into the lower part of the purification chamber of the water seal tank, and the input end of the purified gas pipe extends into the upper part of the purification chamber of the water seal tank. The output end of the purified gas pipe is connected to the first channel of the three-way valve, the input end of the branch pipe is connected to the second channel of the three-way valve, and the output end of the branch pipe is connected to the methane inlet of the mixing controller. The output end of the oxidant pipe is connected to the oxidant inlet of the mixing controller, the input end of the mixing pipe is connected to the mixed gas outlet of the mixing controller, and the output end of the mixing pipe is connected to the inlet of the catalytic oxidizer. The catalytic oxidizer is installed in the biofilm layer, and a catalyst is set inside the catalytic oxidizer. The by-product pipe is connected to the outlet of the catalytic oxidizer, and the output end of the by-product pipe extends out of the anaerobic tank. The third channel of the three-way valve is connected to the methane recovery system. The purification chamber of the water seal tank is filled with purified gas. The purification agent, via the outlet pipe, introduces methane gas into the purification chamber of the water-sealed tank. This agent adsorbs residual water vapor and other impurities, thus purifying the methane. The methane gas is then output through the purification gas pipe. Switching the three-way valve allows methane to enter the methane recovery system through its third channel. Switching the three-way valve again allows methane to enter the mixing controller through its second channel and branch pipe. An external oxidant, such as oxygen or hydrogen peroxide, is introduced into the mixing controller through the oxidant pipe. The mixing controller mixes the methane and oxidant in a specific ratio and then introduces the mixture into the catalytic oxidizer through the mixing pipe. The catalytic oxidizer is either coiled or sponge-like, with a catalyst placed inside the coil or on the sponge packing. This allows the methane and oxidant to undergo catalytic oxidation under the action of the catalyst, generating heat. This heat diffuses through the catalytic oxidizer to the biofilm layer, maintaining a certain temperature and increasing the activity of halophilic methanogens. Simultaneously, byproducts from the catalytic oxidation of methane, such as methanol, are collected through the byproduct pipe.

[0014] Preferably, the inlet pipeline includes an inlet pipe, an activated carbon filter, a baffle plate, a circulation pump, a supply pipe, and a return pipe. The output end of the inlet pipe is connected to the inlet end of the activated carbon filter. The activated carbon filter has a filter chamber filled with activated carbon. The baffle plate is installed at an angle in the filter chamber of the activated carbon filter, and a water passage gap is provided between the upper end of the baffle plate and the top wall of the activated carbon filter. The outlet end of the activated carbon filter is connected to the inlet end of the circulation pump. The input end of the supply pipe is connected to the outlet end of the circulation pump. The output end of the supply pipe is connected to the inlet end of the water replenisher. The output end of the return pipe is connected to the inlet pipe. The inlet end of the pipe extends into the treatment chamber of the anaerobic tank, while the inlet end of the return pipe is located between the biofilm layer and the three-phase separator. High-salt wastewater is fed into the activated carbon filter through the inlet pipe. The activated carbon in the activated carbon filter filters out colloids and removes toxic substances from the high-salt wastewater. The circulating pump operates to distribute the high-salt wastewater that has passed through the activated carbon filter to the water replenisher through the water supply pipe. The high-salt wastewater that has undergone biodegradation in the biofilm layer flows back to the inlet pipe through the return pipe for circulation filtration. The power of the circulating pump is adjusted to adjust the upward flow velocity of the high-salt wastewater to 4-6 m / h, promoting sludge granulation and preventing salt sedimentation and crystallization from causing blockage.

[0015] Secondly, the present invention provides a method for applying an anaerobic membrane bioreactor system for treating high-salinity wastewater, comprising:

[0016] S1. The inlet pipeline and water replenisher input high-salt wastewater into the bottom of the treatment chamber of the anaerobic tank, and adjust the upward flow velocity of the high-salt wastewater to 4-6 m / h, so that the high-salt wastewater can fully contact the anaerobic biofilm of halophilic methanogenic bacteria composed of spherical polyethylene packing in the biofilm layer for biodegradation, producing sludge particles and methane.

[0017] S2. The three-phase separator intercepts the sludge produced after biodegradation and causes the sludge to settle. The settled sludge is discharged through the sludge outlet pipe. The high-salt wastewater after being filtered by the ceramic packing in the ceramic filter device is discharged through the drain pipe. The generated methane gas and water vapor are fed into the gas storage chamber of the gas-water separator through the gas collection pipe for transfer and storage, and discharged to the water seal tank through the gas outlet pipe for purification. The purified methane is collected, and the water vapor in the gas-water separator is condensed to form condensate.

[0018] S3. The mixture of methane and oxidant is fed into the catalytic oxidizer for catalytic oxidation at room temperature. The heat generated increases the activity of halophilic methanogens in the biofilm layer. The by-products produced by the catalytic oxidation of methane are discharged and collected through the by-product tube.

[0019] S4. Use the condensate in the steam-water separator to backwash the ceramic packing in the ceramic filter to maintain the filtration efficiency of the ceramic packing.

[0020] S5. Turn on the electromagnetic controller to generate a changing magnetic field. The changing magnetic field interacts with the magnetic material in the spherical polyethylene packing particles, causing the spherical polyethylene packing particles to vibrate. This vibrates the sludge out of the pores of the spherical hydrophilic modified polyethylene packing that fills the biofilm layer, thus maintaining the biodegradation efficiency of the halophilic methanogenic anaerobic biofilm in the biofilm layer.

[0021] Compared with existing technologies, the advantages of this invention are as follows: it is suitable for high-salinity wastewater with a salinity of 2%-2.5% and COD ≥ 10000 mg / L. The three-phase separator and ceramic filter work together to achieve efficient gas-liquid-solid separation. The three-phase separator and biofilm layer work together to enhance the biofilm. Spherical hydrophilic modified polyethylene packing is used to fix halophilic bacteria, which are tolerant to salinity fluctuations and have high tolerance to inhibitory substances such as heavy metals and ammonia nitrogen. The activity of halophilic bacteria is not reduced due to salt precipitation effect, and the COD removal rate is ≥ 75%. Compared with reverse osmosis membrane technology, it is not troubled by salt crystallization blockage and has good operational stability. Compared with evaporation technology, it has lower cost. In addition, it can operate continuously under high salinity conditions and has good practicality. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the front section structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the isometric structure of the present invention;

[0025] Figure 4 It is a structural diagram of the water inlet pipeline and water supply device, etc.

[0026] Figure 5 This is a partial cross-sectional structural diagram of the three-phase separator and gas collection pipe, etc.

[0027] Figure 6 It is a structural diagram showing the decomposition state of structures such as a three-phase separator, gas collection pipe, backwash pipe, and polymer membrane;

[0028] Figure 7 It is a structural diagram of the gas collection pipe, ceramic filter device, gas-water separator, gas outlet pipe, backwash pipe, liquid level and pressure sensor and high pressure pipe, etc.

[0029] Figure 8 It is a structural diagram of the biofilm layer, magnetic materials, electromagnetic components, water seal tank, three-way valve, mixing controller, catalytic oxidizer and by-product pipe, etc.

[0030] Figure 9 This is a schematic diagram of the structure of spherical polyethylene filler particles containing magnetic materials;

[0031] Figure 10 It is a structural diagram of the electromagnetic components, electromagnetic controller, mixing tube, catalytic oxidizer, and by-product tube, etc.

[0032] Figure 11 This is the COD removal rate curve (horizontal axis: number of operating days, vertical axis: COD value).

[0033] Figure 12 This is a comparison chart of salinity stability (left vertical axis: COD value, right vertical axis: salinity, horizontal axis: number of days of operation).

[0034] The attached diagram is labeled as follows: 1. Anaerobic tank; 2. Inlet pipe; 3. Make-up water device; 4. Sludge outlet pipe; 5. Biofilm layer; 6. Three-phase separator; 7. Gas collection pipe; 8. Ceramic filter; 9. Gas-water separator; 10. Gas outlet pipe; 11. Backwash pipe; 12. Liquid level and pressure sensor; 13. High-pressure pipe; 14. Polymer membrane; 15. Upper gas collection pipe; 16. Sludge baffle; 17. Filter plate; 18. Gas collection hood; 19. Sludge discharge hole; 20. Sludge discharge pipe. ; 21. Shaft; 22. Impeller; 23. Magnetic material; 24. Electromagnetic components; 25. Electromagnetic controller; 26. Water seal tank; 27. Purification gas pipe; 28. Three-way valve; 29. ​​Branch pipe; 30. Mixing controller; 31. Oxidant pipe; 32. Mixing pipe; 33. Catalytic oxidizer; 34. By-product pipe; 35. Water inlet pipe; 36. Activated carbon filter; 37. Baffle plate; 38. Circulation pump; 39. Water delivery pipe; 40. Return pipe. Detailed Implementation

[0035] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0036] Example 1: As Figures 1 to 4As shown, an anaerobic membrane bioreactor system for treating high-salinity wastewater includes an anaerobic tank 1, an inlet pipeline 2, a water supply device 3, and a sludge discharge pipe 4. The anaerobic tank 1 has a treatment chamber inside. The water supply device 3 is installed at the output end of the inlet pipeline 2, and is located at the bottom of the treatment chamber of the anaerobic tank 1. The sludge discharge pipe 4 is installed on the side wall of the anaerobic tank 1 and communicates with the bottom of the treatment chamber. The system also includes a biofilm layer 5, a three-phase separator 6, a gas collection pipe 7, a ceramic filter 8, a gas-liquid separator 9, and a gas outlet pipe 10. The biofilm layer 5, the three-phase separator 6, and the ceramic filter 8 are installed in the treatment chamber of the anaerobic tank 1. The gas-liquid separator 9 is installed on top of the anaerobic tank 1. Tank 9 has an internal gas storage chamber. A gas outlet pipe 10 connected to the gas storage chamber is installed on tank 9. Biofilm layer 5 is located above water replenisher 3. The interior of biofilm layer 5 is filled with spherical polyethylene packing material, which is used to fix the halophilic methanogen biofilm. Three-phase separator 6 is located above biofilm layer 5. The lower end of gas collection pipe 7 is connected to three-phase separator 6, and the upper end of gas collection pipe 7 extends into the gas storage chamber of tank 9. Three-phase separator 6 causes sludge to settle. Methane produced by the halophilic methanogen biofilm is input into the gas storage chamber of tank 9 through gas collection pipe 7 and discharged through gas outlet pipe 10. Ceramic filter device 8 is located above three-phase separator 6. The ceramic filter device 8 is filled with ceramic packing material. A drain pipe is installed on the anaerobic tank 1, located above the ceramic filter device 8. It also includes a polymer membrane 14 and an upper gas collecting pipe 15. The polymer membrane 14 is installed in the upper part of the treatment chamber of the anaerobic tank 1, located above the drain pipe. The upper end of the upper gas collecting pipe 15 extends into the gas storage chamber of the gas-water separator 9, and the lower end of the upper gas collecting pipe 15 extends into the upper part of the treatment chamber of the anaerobic tank 1, located above the polymer membrane 14. The water inlet pipeline 2 includes an inlet pipe 35, an activated carbon filter 36, a guide plate 37, a circulation pump 38, a water supply pipe 39, and a return pipe 40. The output end of the inlet pipe 35 is connected to the inlet of the activated carbon filter 36. The activated carbon filter 36 is connected to the anaerobic tank 1. The activated carbon filter 36 has a filter chamber inside, which is filled with activated carbon. The guide plate 37 is installed at an angle in the filter chamber of the activated carbon filter 36. A water passage gap is set between the upper end of the guide plate 37 and the top wall of the activated carbon filter 36. The outlet end of the activated carbon filter 36 is connected to the inlet end of the circulating pump 38. The inlet end of the water supply pipe 39 is connected to the outlet end of the circulating pump 38. The outlet end of the water supply pipe 39 is connected to the inlet end of the water replenisher 3. The outlet end of the return pipe 40 is connected to the inlet pipe 35. The inlet end of the return pipe 40 extends into the treatment chamber of the anaerobic tank 1. The inlet end of the return pipe 40 is located between the biofilm layer 5 and the three-phase separator 6.

[0037] The activated carbon filter 36 is internally filled with granular activated carbon with a particle size of 1-2 mm and an iodine value ≥1000 mg / g; the biofilm layer 5 is filled with spherical hydrophilic modified polyethylene packing with a porosity ≥90% and a pore size of 2-3 mm, used to immobilize the halophilic methanogenic biofilm; the ceramic filter device 8 is internally filled with ceramic packing with a pore size of 50 μm; during operation, high-salt wastewater is input into the activated carbon filter 36 through the inlet pipe 35. The activated carbon in the activated carbon filter 36 filters and traps colloids in the high-salt wastewater and removes toxic substances. The circulating pump 38 operates to input the high-salt wastewater filtered by the activated carbon into the replenishment pump through the delivery pipe 39. Water is distributed in water device 3, with a flow rate controlled at 400-500 m³ / d. High-salt wastewater, after biodegradation in biofilm layer 5, flows back to inlet pipe 35 via return pipe 40 for circulation filtration. The power of circulation pump 38 is adjusted to regulate the upward flow velocity of the high-salt wastewater to 4-6 m / h, promoting sludge granulation and preventing salt sedimentation and crystallization from causing blockage. The high-salt wastewater flows upward through the halophilic methanogenic anaerobic biofilm composed of spherical polyethylene packing material in biofilm layer 5, allowing the halophilic methanogenic anaerobic biofilm to anaerobicly degrade the high-salt wastewater, decomposing organic waste in the high-salt wastewater to produce methane gas and reducing MLSS (methyl sulfoxide, methyl saline). The concentration of suspended solids in the mixed liquor is maintained at 15-20 g / L; the three-phase separator 6 intercepts the sludge produced after biodegradation and causes the sludge to settle. The settled sludge is discharged through the sludge outlet pipe 4. The generated methane gas and water vapor are fed into the gas storage chamber of the gas-water separator 9 through the gas collection pipe 7 for transfer and storage, and are discharged through the gas outlet pipe 10. The high-salt wastewater after biodegradation continues to rise after passing through the three-phase separator 6 and then passes through the ceramic filter device 8. The ceramic packing in the ceramic filter device 8 intercepts free sludge and suspended solids. The filtered and purified high-salt wastewater is discharged through the drain pipe into subsequent treatment equipment. Compared with the existing technology, it is suitable for salinity 2. For high-salinity wastewater with a concentration of -2.5% and COD ≥ 10000 mg / L, the three-phase separator 6 and biofilm layer 5 work synergistically to achieve efficient gas-liquid-solid separation. The three-phase separator 6 and biofilm layer 5 work together to enhance the biofilm, using spherical hydrophilic modified polyethylene packing to immobilize halophilic bacteria. This process is tolerant to salinity fluctuations and exhibits high tolerance to inhibitory substances such as heavy metals and ammonia nitrogen. Furthermore, the activity of the halophilic bacteria does not decrease due to salt precipitation, resulting in a COD removal rate ≥ 75%. Compared to reverse osmosis membrane technology, it is not affected by salt crystallization clogging and has better operational stability. Compared to evaporation technology, it has lower costs. In addition, it can operate continuously under high salinity conditions, making it highly practical. The polymer membrane 14 covers the surface of the high-salinity wastewater, allowing residual methane gas in the wastewater between the ceramic filter device 8 and the polymer membrane 14 to permeate through the polymer membrane 14 to the top of the treatment chamber of the anaerobic tank 1 and then into the gas storage chamber of the gas-water separator 9 via the upper gas collection pipe 15, thus improving the methane gas collection efficiency.

[0038] like Figure 11 and Figure 12As shown, the data from the treatment of high-salinity wastewater using the system described in Example 1 are summarized below:

[0039] COD load is 12000-16000 mg / L, influent COD average is 14500 mg / L, effluent COD is stable at 2800-3200 mg / L, COD removal rate is ≥75%, specifically 78%-82%;

[0040] The influent salinity is 2%-2.5%, specifically 2.5%, and the effluent salinity fluctuates between 2.45% and 2.52%. The influent and effluent salinity fluctuation is ≤±10%, the treatment efficiency decrease is <5%, and the stability reaches 90 days.

[0041] Example 2: As Figures 1 to 3 , Figures 5 to 7 As shown, based on Embodiment 1, it also includes a backwash pipe 11, a liquid level and pressure sensor 12, and a high-pressure pipe 13. The lower end of the backwash pipe 11 extends into the ceramic filter device 8, and a solenoid valve is installed at the upper end of the backwash pipe 11. The upper end of the backwash pipe 11 extends into the gas storage chamber of the gas-water separator 9. The liquid level and pressure sensor 12 is installed on the gas-water separator 9 and is used to detect the pressure and liquid level in the gas storage chamber of the gas-water separator 9. The high-pressure pipe 13 is installed on the gas-water separator 9 and is connected to the gas storage chamber of the gas-water separator 9. The three-phase separator 6 includes a mud shield 16, a filter plate 17, and a gas collection hood 18. The mud shield 16 is inverted conical and is installed in the middle of the processing chamber of the anaerobic tank 1. The edge of the mud shield 16 is connected to the inner wall of the anaerobic tank 1, and a rising opening is provided in the middle of the mud shield 16. The filter plate 17 is installed on the gas storage chamber of the anaerobic tank 1. In the rising opening of the mud shield 16, the gas collecting hood 18 is installed above the mud shield 16. The gas collecting hood 18 is inverted cone-shaped. A downward flow channel is provided between the gas collecting hood 18 and the mud shield 16. The lower end of the gas collecting pipe 7 is connected to the top of the gas collecting hood 18. A wastewater channel is provided between the edge of the gas collecting hood 18 and the inner wall of the anaerobic tank 1. It also includes multiple mud discharge holes 19 and multiple mud discharge pipes 20. Multiple mud discharge holes 19 are arranged circumferentially at the lower edge of the mud shield 16. The multiple mud discharge holes 19 are located below the gas collecting hood 18. Multiple mud discharge pipes 20 are respectively installed in the multiple mud discharge holes 19. The lower ends of the multiple mud discharge pipes 20 extend into the lower part of the mud shield 16 and face the filter plate 17. It also includes a rotating shaft 21 and an impeller 22. The rotating shaft 21 is rotatably installed in the filter plate 17. The impeller 22 is installed at the lower end of the rotating shaft 21. The impeller 22 is provided with multiple spiral blades. The multiple spiral blades scrape the lower end face of the filter plate 17.

[0042] The mud baffle 16 and the gas collection hood 18 are set with a taper of 55°. After the biodegradation of high-salt wastewater flows upward, it is gathered by the mud baffle 16 and then preliminarily filtered by the filter plate 17. The sludge particles in the high-salt wastewater are intercepted by the mud baffle 16 and the filter plate 17 and settle and accumulate at the bottom of the treatment chamber of the anaerobic tank 1. The preliminarily filtered high-salt wastewater is gathered by the gas collection hood 18, so that the methane gas in the high-salt wastewater accumulates at the top of the gas collection hood 18 and is then input into the gas storage chamber of the gas-water separator 9 through the gas collection pipe 7. At the same time, the preliminarily filtered high-salt wastewater flows upward along the downstream channel and the wastewater channel between the mud baffle 16 and the gas collection hood 18, realizing efficient gas-liquid-solid three-phase separation of the biodegradation of high-salt wastewater.

[0043] A condenser is installed in the steam-water separator 9 to condense and liquefy water vapor in the gas storage chamber of the steam-water separator 9. The condensate is stored at the bottom of the gas storage chamber of the steam-water separator 9. The liquid level and pressure sensor 12 detects the liquid level of the condensate. When the liquid level of the condensate reaches the threshold, high-pressure air is input into the gas storage chamber of the steam-water separator 9 through the high-pressure pipe 13. When the pressure value detected by the liquid level and pressure sensor 12 reaches the threshold, the solenoid valve on the backwash pipe 11 automatically opens, allowing the condensate to flow down into the ceramic filter device 8 through the backwash pipe 11 to backwash the ceramic packing. This achieves automatic backwashing of the ceramic packing in the ceramic filter device 8, maintaining the filtration effect of the ceramic packing. The filter maintenance cycle can be set to backwash once a day to ensure that the suspended solids in the effluent are ≤30mg / L.

[0044] In the ceramic filter device 8, the sludge particles that fall after the ceramic packing is backflushed fall along the gas collection hood 18 and accumulate at the upper edge of the mud baffle 16. The sludge falls again through multiple sludge drop pipes 20 to the bottom of the treatment chamber of the anaerobic tank 1. Since the multiple sludge drop holes 19 are blocked by the gas collection hood 18, the lower ends of the multiple sludge drop pipes 20 face the filter plate 17, making the lower ends of the multiple sludge drop pipes 20 needle-shaped. This prevents the sludge in the rising high-salt wastewater from rising through the sludge drop pipes 20. In addition, a small amount of methane gas in the high-salt wastewater is gathered again by the gas collection hood 18 after passing through the multiple sludge drop pipes 20, thereby improving the efficiency of three-phase separation. When the rising high-salt wastewater flows upward through the filter plate 17, it drives the impeller 22 and the rotating shaft 21 to rotate, causing the spiral blades to scrape the filter plate 17 and prevent the filter holes of the filter plate 17 from becoming clogged.

[0045] Example 3: As Figures 1 to 3 , Figures 8 to 10As shown, based on Examples 1 and 2, it also includes magnetic material 23, electromagnetic component 24, and electromagnetic controller 25. Magnetic material 23 is added to the spherical polyethylene filler particles filled in the ceramic filter device 8. Electromagnetic component 24 is installed on biofilm layer 5, and electromagnetic controller 25 is installed on anaerobic tank 1. Electromagnetic controller 25 is electrically connected to electromagnetic component 24. It also includes a water seal tank 26, purification gas pipe 27, three-way valve 28, branch pipe 29, mixing controller 30, oxidant pipe 31, mixing pipe 32, catalytic oxidizer 33, and by-product pipe 34. Water seal tank 26 is installed on anaerobic tank 1. Purification chamber is set inside water seal tank 26. The output end of gas outlet pipe 10 extends into the lower part of purification chamber of water seal tank 26. The input end of pipe 27 extends into the upper part of the purification chamber of water seal tank 26. The output end of purification gas pipe 27 is connected to the first channel of three-way valve 28. The input end of branch pipe 29 is connected to the second channel of three-way valve 28. The output end of branch pipe 29 is connected to the methane inlet of mixing controller 30. The output end of oxidant pipe 31 is connected to the oxidant inlet of mixing controller 30. The input end of mixing pipe 32 is connected to the mixed gas outlet of mixing controller 30. The output end of mixing pipe 32 is connected to the inlet of catalytic oxidizer 33. Catalytic oxidizer 33 is installed in biofilm layer 5. Catalyst is installed inside catalytic oxidizer 33. Byproduct pipe 34 is connected to the outlet of catalytic oxidizer 33. The output end of byproduct pipe 34 extends out of the outside of anaerobic tank 1.

[0046] The third channel of the three-way valve 28 is connected to the methane recovery system. A purifying agent is added to the purification chamber of the water seal tank 26. The outlet pipe 10 introduces methane gas into the purifying agent in the purification chamber of the water seal tank 26. The purifying agent includes a water absorbent and a harmful gas adsorbent, etc. The purifying agent is used to adsorb residual water vapor and other impurities, thereby purifying the methane. The methane gas is output through the purified gas pipe 27. Switching the three-way valve 28 allows methane to be input into the methane recovery system through the third channel of the three-way valve 28. Switching the three-way valve 28 also allows methane to be input into the mixing controller 30 through the second channel and branch pipe 29 of the three-way valve 28. An external oxidant, such as oxygen, is also introduced. Alternatively, hydrogen peroxide is introduced into the mixing controller 30 through the oxidant pipe 31. The mixing controller 30 mixes methane and oxidant in a certain proportion and then introduces them into the catalytic oxidizer 33 through the mixing pipe 32. The catalytic oxidizer 33 is coiled or sponge-shaped, and a catalyst is placed inside the coil or on the sponge-shaped packing. Under the action of the catalyst in the catalytic oxidizer 33, methane and oxidant undergo catalytic oxidation and generate heat. The heat diffuses to the biofilm layer 5 through the catalytic oxidizer 33, thereby maintaining the biofilm layer 5 at a certain temperature and improving the activity of halophilic methanogens. At the same time, by-products such as methanol produced by the catalytic oxidation of methane are discharged and collected through the by-product pipe 34.

[0047] The magnetic material 23 is a magnetic powder or granules, which causes the spherical polyethylene packing particles filled in the ceramic filter device 8 to adsorb and clump together, making the spherical polyethylene packing more stable and allowing magnetic pollutants in the high-salt wastewater to be adsorbed and removed. The electromagnetic controller 25 sends changing current and voltage to the electromagnetic component 24, causing the electromagnetic component 24 to generate a changing magnetic field. The changing magnetic field interacts with the magnetic material 23 in the spherical polyethylene packing particles, causing the spherical polyethylene packing particles to vibrate, thereby shaking out the sludge in the pores of the spherical hydrophilic modified polyethylene packing filled in the biofilm layer 5, maintaining the biodegradation efficiency of the spherical hydrophilic modified polyethylene packing filled in the biofilm layer 5.

[0048] In this embodiment, the following catalyst can be selected:

[0049] 1. Molybdenum disulfide (MoS2) edge sulfur vacancy catalyst:

[0050] -Catalytic conditions: At 25℃, methane is directly oxidized by oxygen (O2) to produce C1 oxygen-containing compounds such as methanol;

[0051] -Performance: Methane conversion rate 4.2%, C1 product selectivity >99%, binuclear molybdenum sites generate O=Mo=O active species through the dissociation of oxygen O2;

[0052] -Advantages: It mimics the active site structure of natural methane monooxygenase (MMO) to achieve efficient conversion under mild conditions;

[0053] 2. Nano-confined Pd catalyst:

[0054] -Catalytic conditions: At room temperature, hydrogen peroxide (H2O2) was used as the oxidant, and the electronic environment was regulated by the nano-confining effect;

[0055] -Application: Directly converts methane into basic chemical raw materials such as methanol, significantly reducing energy consumption.

[0056] The application method of an anaerobic membrane bioreactor system for treating high-salinity wastewater based on Examples 1, 2, and 3 is as follows:

[0057] S1, the inlet pipeline 2 and the water replenisher 3 input high-salt wastewater into the bottom of the treatment chamber of anaerobic tank 1, and adjust the upward flow velocity of high-salt wastewater to 4-6 m / h, so that the high-salt wastewater can fully contact the halophilic methanogenic anaerobic biofilm composed of spherical polyethylene packing in biofilm layer 5 to carry out biodegradation, producing sludge particles and methane.

[0058] S2, the three-phase separator 6 intercepts the sludge produced after biodegradation and causes the sludge to settle. The settled sludge is discharged through the sludge outlet pipe 4. The high-salt wastewater filtered by the ceramic packing in the ceramic filter device 8 is discharged through the drain pipe. The generated methane gas and water vapor are fed into the gas storage chamber of the gas-water separator 9 through the gas collection pipe 7 for transfer and storage, and discharged through the gas outlet pipe 10 to the water seal tank 26 for purification. The purified methane is collected, and the water vapor in the gas-water separator 9 is condensed to form condensate.

[0059] S3. The mixture of methane and oxidant is fed into the catalytic oxidizer 33 for room temperature catalytic oxidation. The heat generated increases the activity of halophilic methanogens in the biofilm layer 5. The byproducts produced by the catalytic oxidation of methane are discharged and collected through the byproduct tube 34.

[0060] S4. Use the condensate in the steam-water separator 9 to backwash the ceramic packing in the ceramic filter device 8 to maintain the filtration efficiency of the ceramic packing.

[0061] S5. Turn on the electromagnetic controller 25, so that the electromagnetic component 24 generates a changing magnetic field. The changing magnetic field interacts with the magnetic material 23 in the spherical polyethylene packing particles, causing the spherical polyethylene packing particles to vibrate. This vibrates out the sludge from the pores of the spherical hydrophilic modified polyethylene packing filling the biofilm layer 5, thus maintaining the biodegradation efficiency of the halophilic methanogenic anaerobic biofilm in the biofilm layer 5.

[0062] like Figures 1 to 12As shown, this invention discloses an anaerobic membrane bioreactor system and its application method for treating high-salinity wastewater. During operation, the high-salinity wastewater is first input into the water replenisher 3 through the inlet pipeline 2, and then distributed to the bottom of the treatment chamber of the anaerobic tank 1 via the water replenisher 3. The power of the circulating pump 38 is adjusted to adjust the upward flow velocity of the high-salinity wastewater to 4-6 m / h. The high-salinity wastewater flows upward through the halophilic methanogenic anaerobic biofilm composed of spherical polyethylene packing material in the biofilm layer 5, allowing the halophilic methanogenic anaerobic biofilm to anaerobically biodegrade the high-salinity wastewater, decomposing the organic waste in the high-salinity wastewater into... Methane gas is generated, and the suspended solids concentration of the MLSS mixture is maintained at 15-20 g / L. Then, the three-phase separator 6 intercepts the sludge produced after biodegradation and causes it to settle. The settled sludge is discharged through the sludge outlet pipe 4. The generated methane gas and water vapor are fed into the gas storage chamber of the gas-water separator 9 through the gas collection pipe 7 for transfer and storage, and then discharged through the gas outlet pipe 10. The high-salt wastewater after biodegradation continues to rise after passing through the three-phase separator 6 and then through the ceramic filter device 8. The ceramic packing in the ceramic filter device 8 intercepts free sludge and suspended solids. The purified high-salt wastewater then passes through… The water is drained into subsequent treatment equipment; then, a condenser is installed in the steam-water separator 9 to condense and liquefy water vapor in the gas storage chamber of the steam-water separator 9. The condensate is stored at the bottom of the gas storage chamber of the steam-water separator 9. The liquid level and pressure sensor 12 detects the liquid level of the condensate. When the liquid level of the condensate reaches the threshold, high-pressure air is input into the gas storage chamber of the steam-water separator 9 through the high-pressure pipe 13. When the pressure value detected by the liquid level and pressure sensor 12 reaches the threshold, the solenoid valve on the backwash pipe 11 automatically opens, allowing the condensate to flow down through the backwash pipe 11 into the ceramic filter device 8 to clean the ceramic packing. Backwashing is performed to automatically backwash the ceramic packing in the ceramic filter device 8, maintaining the filtration effect of the ceramic packing. Finally, the electromagnetic controller 25 sends changing current and voltage to the electromagnetic component 24, causing the electromagnetic component 24 to generate a changing magnetic field. The changing magnetic field interacts with the magnetic material 23 in the spherical polyethylene packing particles, causing the spherical polyethylene packing particles to vibrate. This vibrates out the sludge from the pores of the spherical hydrophilic modified polyethylene packing filled in the biofilm layer 5, thus maintaining the biodegradation efficiency of the spherical hydrophilic modified polyethylene packing filled in the biofilm layer 5.

[0063] The main functions achieved by this invention are:

[0064] 1. Suitable for high-salinity wastewater, through the synergistic effect of biofilm layer 5, three-phase separator 6 and ceramic filter device 8, it is resistant to salinity fluctuations, has good operational stability and lower cost, can operate continuously under high salinity conditions, and has good practicality;

[0065] 2. Integrated separation: The three-phase separator and ceramic filter work together to achieve efficient gas-liquid-solid separation;

[0066] 3. Biofilm reinforcement: Modified polyethylene filler immobilizes halophilic bacteria, which are tolerant to salinity fluctuations;

[0067] 4. Anti-clogging design: The upward flow velocity in the bottom fluidization zone is ≥4m / h to prevent salt sedimentation;

[0068] 5. Intelligent backwashing: Liquid level and pressure sensor 12 is linked to backwash pipe 11, and ceramic packing is backwashed as needed;

[0069] 6. Automatic purification: Through the interaction between the changing magnetic field and the magnetic material 23, the sludge in the pores of the spherical hydrophilic modified polyethylene filler filled in the biofilm layer 5 can be shaken out, maintaining the biodegradation efficiency of the halophilic methanogenic anaerobic biofilm in the biofilm layer 5.

[0070] 7. High biofilm activity: The mixture of methane and oxidant is fed into the catalytic oxidizer 33 for room temperature catalytic oxidation, which generates heat to increase the activity of halophilic methanogens in the biofilm layer 5. The byproducts produced by the catalytic oxidation of methane are discharged and collected through the byproduct tube 34.

[0071] The anaerobic membrane bioreactor system and its application method for treating high-salinity wastewater of this invention are all common mechanical methods in terms of installation, connection, or setup. Any method that achieves the desired beneficial effects can be implemented. The anaerobic tank 1, inlet pipeline 2, water replenisher 3, biofilm layer 5, three-phase separator 6, ceramic filter 8, backwash pipe 11, liquid level and pressure sensor 12, high-pressure pipe 13, polymer membrane 14, filter plate 17, rotating shaft 21, impeller 22, magnetic material 23, electromagnetic components 24, electromagnetic controller 25, three-way valve 28, mixing controller 30, catalytic oxidizer 33, activated carbon filter 36, circulating pump 38, spherical hydrophilic modified polyethylene packing, halophilic methanogenic bacteria, and ceramic packing are all commercially available. Those skilled in the art only need to install and operate them according to the accompanying instruction manual, without requiring any creative effort from those skilled in the art.

[0072] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An anaerobic membrane bioreactor system for treating high-salinity wastewater, comprising an anaerobic tank (1), an inlet pipeline (2), a water replenisher (3), and a sludge outlet pipe (4), wherein the anaerobic tank (1) has a treatment chamber inside, the water replenisher (3) is installed at the output end of the inlet pipeline (2), the water replenisher (3) is installed at the bottom of the treatment chamber of the anaerobic tank (1), and the sludge outlet pipe (4) is installed on the side wall of the anaerobic tank (1) and is connected to the bottom of the treatment chamber of the anaerobic tank (1); characterized in that, It also includes a biofilm layer (5), a three-phase separator (6), a gas collection pipe (7), a ceramic filter (8), a gas-water separator (9), and an outlet pipe (10). The biofilm layer (5), the three-phase separator (6), and the ceramic filter (8) are installed in the processing chamber of the anaerobic tank (1). The gas-water separator (9) is installed on top of the anaerobic tank (1). The gas-water separator (9) has a gas storage chamber inside. An outlet pipe (10) connected to the gas storage chamber is installed on the gas-water separator (9). The biofilm layer (5) is located above the water replenisher (3). The biofilm layer (5) is filled with spherical hydrophilic modified polyethylene filler. The porosity of the spherical hydrophilic modified polyethylene filler is ≥90%, and the pore size is 2-3 mm. A hydrophilic modified polyethylene packing is used to fix the halophilic methanogen biofilm. The three-phase separator (6) is located above the biofilm layer (5). The lower end of the gas collection pipe (7) is connected to the three-phase separator (6). The upper end of the gas collection pipe (7) extends into the gas storage chamber of the gas-water separator (9). The three-phase separator (6) causes the sludge to settle. The methane produced by the halophilic methanogen biofilm is input into the gas storage chamber of the gas-water separator (9) through the gas collection pipe (7) and discharged through the gas outlet pipe (10). The ceramic filter device (8) is located above the three-phase separator (6). The ceramic filter device (8) is filled with ceramic packing with a pore size of 50 μm. A drain pipe is installed on the anaerobic tank (1). The drain pipe is located above the ceramic filter device (8).

2. The anaerobic membrane bioreactor system for treating high-salinity wastewater as described in claim 1, characterized in that, It also includes a backwash pipe (11), a liquid level and pressure sensor (12), and a high-pressure pipe (13). The lower end of the backwash pipe (11) extends into the ceramic filter device (8), and a solenoid valve is installed at the upper end of the backwash pipe (11). The upper end of the backwash pipe (11) extends into the gas storage chamber of the gas-water separator (9). The liquid level and pressure sensor (12) is installed on the gas-water separator (9) and is used to detect the pressure and liquid level in the gas storage chamber of the gas-water separator (9). The high-pressure pipe (13) is installed on the gas-water separator (9) and is connected to the gas storage chamber of the gas-water separator (9).

3. The anaerobic membrane bioreactor system for treating high-salinity wastewater as described in claim 1, characterized in that, It also includes a polymer membrane (14) and an upper gas collecting pipe (15). The polymer membrane (14) is installed in the upper part of the processing chamber of the anaerobic tank (1). The polymer membrane (14) is located above the drain pipe. The upper end of the upper gas collecting pipe (15) extends into the gas storage chamber of the gas-water separator (9). The lower end of the upper gas collecting pipe (15) extends into the upper part of the processing chamber of the anaerobic tank (1). The lower end of the upper gas collecting pipe (15) is located above the polymer membrane (14).

4. The anaerobic membrane bioreactor system for treating high-salinity wastewater as described in claim 1, characterized in that, The three-phase separator (6) includes a mud shield (16), a filter plate (17), and a gas collection hood (18). The mud shield (16) is an inverted cone shape. The mud shield (16) is installed in the middle of the treatment chamber of the anaerobic tank (1). The edge of the mud shield (16) is connected to the inner wall of the anaerobic tank (1). A rising opening is provided in the middle of the mud shield (16). The filter plate (17) is installed in the rising opening of the mud shield (16). The gas collection hood (18) is installed above the mud shield (16). The gas collection hood (18) is an inverted cone shape. A downward flow channel is provided between the gas collection hood (18) and the mud shield (16). The lower end of the gas collection pipe (7) is connected to the top of the gas collection hood (18). A wastewater channel is provided between the edge of the gas collection hood (18) and the inner wall of the anaerobic tank (1).

5. The anaerobic membrane bioreactor system for treating high-salinity wastewater as described in claim 4, characterized in that, It also includes multiple mud-falling holes (19) and multiple mud-falling pipes (20). Multiple mud-falling holes (19) are arranged circumferentially at the lower edge of the mud shield (16). The multiple mud-falling holes (19) are located below the air collection hood (18). Multiple mud-falling pipes (20) are installed in the multiple mud-falling holes (19) respectively. The lower ends of the multiple mud-falling pipes (20) extend into the lower part of the mud shield (16) and face the filter plate (17).

6. The anaerobic membrane bioreactor system for treating high-salinity wastewater as described in claim 4, characterized in that, It also includes a rotating shaft (21) and an impeller (22). The rotating shaft (21) is rotatably installed in the filter plate (17). The impeller (22) is installed at the lower end of the rotating shaft (21). The impeller (22) is provided with multiple spiral blades, which scrape the lower end face of the filter plate (17).

7. The anaerobic membrane bioreactor system for treating high-salinity wastewater as described in claim 1, characterized in that, It also includes magnetic material (23), electromagnetic component (24) and electromagnetic controller (25). Magnetic material (23) is added to the spherical hydrophilic modified polyethylene filler filling the biofilm layer (5). Electromagnetic component (24) is installed on biofilm layer (5). Electromagnetic controller (25) is installed on anaerobic tank (1). Electromagnetic controller (25) is electrically connected to electromagnetic component (24).

8. The anaerobic membrane bioreactor system for treating high-salinity wastewater as described in claim 7, characterized in that, It also includes a water seal tank (26), a purification gas pipe (27), a three-way valve (28), a branch pipe (29), a mixing controller (30), an oxidant pipe (31), a mixing pipe (32), a catalytic oxidizer (33), and a by-product pipe (34). The water seal tank (26) is installed on the anaerobic tank (1). The water seal tank (26) has a purification chamber inside. The output end of the gas outlet pipe (10) extends into the lower part of the purification chamber of the water seal tank (26), and the input end of the purification gas pipe (27) extends into the upper part of the purification chamber of the water seal tank (26). The output end of the purification gas pipe (27) is connected to the first channel of the three-way valve (28), and the input end of the branch pipe (29) is connected to the three-way valve. The second channel of valve (28) is connected, the output end of branch pipe (29) is connected to the methane inlet of mixing controller (30), the output end of oxidant pipe (31) is connected to the oxidant inlet of mixing controller (30), the input end of mixing pipe (32) is connected to the mixed gas outlet of mixing controller (30), the output end of mixing pipe (32) is connected to the inlet of catalytic oxidizer (33), catalytic oxidizer (33) is installed in biofilm layer (5), catalyst is set inside catalytic oxidizer (33), by-product pipe (34) is connected to the outlet of catalytic oxidizer (33), and the output end of by-product pipe (34) extends out of the outside of anaerobic tank (1).

9. The anaerobic membrane bioreactor system for treating high-salinity wastewater as described in claim 1, characterized in that, The inlet pipeline (2) includes an inlet pipe (35), an activated carbon filter (36), a guide plate (37), a circulation pump (38), a water supply pipe (39), and a return pipe (40). The output end of the inlet pipe (35) is connected to the inlet end of the activated carbon filter (36). The activated carbon filter (36) has a filter chamber inside, which is filled with activated carbon. The guide plate (37) is installed at an angle in the filter chamber of the activated carbon filter (36), and the upper end of the guide plate (37) is connected to the activated carbon filter. A water passage gap is provided between the top walls of the device (36). The outlet end of the activated carbon filter (36) is connected to the inlet end of the circulating pump (38). The input end of the water supply pipe (39) is connected to the outlet end of the circulating pump (38). The output end of the water supply pipe (39) is connected to the inlet end of the water replenisher (3). The output end of the return pipe (40) is connected to the inlet pipe (35). The input end of the return pipe (40) extends into the treatment chamber of the anaerobic tank (1). The input end of the return pipe (40) is located between the biofilm layer (5) and the three-phase separator (6).

10. The application method of the anaerobic membrane bioreactor system for treating high-salinity wastewater as described in any one of claims 1 to 9, characterized in that, include: S1, the inlet pipeline (2) and the water replenisher (3) input the high-salt wastewater into the bottom of the treatment chamber of the anaerobic tank (1) and adjust the upward flow velocity of the high-salt wastewater to 4-6 m / h so that the high-salt wastewater can fully contact the anaerobic biofilm of halophilic methanogens composed of spherical hydrophilic modified polyethylene packing in the biofilm layer (5) for biodegradation, producing sludge particles and methane; S2, the three-phase separator (6) intercepts the sludge produced after biodegradation and causes the sludge to settle. The settled sludge is discharged through the sludge outlet pipe (4). The high-salt wastewater filtered by the ceramic packing in the ceramic filter device (8) is discharged through the drain pipe. The generated methane gas and water vapor are input into the gas storage chamber of the gas-water separator (9) through the gas collection pipe (7) for transfer and storage, and discharged through the gas outlet pipe (10) to the water seal tank (26) for purification. The purified methane is collected. The water vapor in the gas-water separator (9) is condensed to form condensate. S3. The mixture of methane and oxidant is fed into the catalytic oxidizer (33) for room temperature catalytic oxidation. The heat generated increases the activity of halophilic methanogens in the biofilm layer (5). The byproducts produced by the catalytic oxidation of methane are discharged and collected through the byproduct tube (34). S4. Use the condensate in the steam-water separator (9) to backwash the ceramic packing in the ceramic filter device (8) to maintain the filtration efficiency of the ceramic packing. S5. Turn on the electromagnetic controller (25) to generate a changing magnetic field in the electromagnetic component (24). The changing magnetic field interacts with the magnetic material (23) in the spherical hydrophilic modified polyethylene packing, thereby causing the spherical hydrophilic modified polyethylene packing to vibrate, thereby shaking out the sludge in the pores of the spherical hydrophilic modified polyethylene packing filled in the biofilm layer (5), and maintaining the biodegradation efficiency of the halophilic methanogenic anaerobic biofilm in the biofilm layer (5).

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