Integrated sewage treatment equipment

Abstract

The invention discloses integrated sewage treatment equipment, which relates to the technical field of sewage treatment and comprises an adjusting tank, a biodegradation tank, a membrane bioreactor, an aeration device and a backwashing unit. Wherein the regulating tank is used for preliminarily stirring sewage, the biodegradation tank is internally provided with an anaerobic zone, an anoxic zone and an aerobic zone, the membrane bioreactor is mounted in the aerobic zone, the aeration device provides oxygen for each zone and forms bubble disturbance on the membrane surface, and the backwashing unit is used for periodically cleaning a membrane component. According to the invention, integrated treatment of sewage is realized, the nitrogen and phosphorus removal efficiency is improved, and the risk of membrane pollution is reduced at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and particularly relates to an integrated sewage treatment device. Background Art

[0002] Current sewage treatment technologies mainly include the activated sludge method, the biofilm method, the MBR method, etc. MBR, also known as, is a new type of water treatment technology combined with membrane separation technology. Due to its high-efficiency solid-liquid separation ability and excellent effluent quality, MBR technology has gradually become one of the mainstream technologies in the field of sewage treatment.

[0003] However, in the process of using traditional MBR systems, there are problems such as serious membrane fouling and low nitrogen and phosphorus removal efficiency, which are difficult to effectively apply to sewage treatment systems with high requirements for nitrogen and phosphorus removal, restricting the possibility of its large-scale popularization and application. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present application provides an integrated sewage treatment device.

[0005] In a first aspect, an integrated sewage treatment device provided by the present application adopts the following technical solution: An integrated sewage treatment device includes an adjustment tank, in which a stirring device for stirring sewage is provided, and a lift pump is provided in the adjustment tank. The lift pump is connected to a sewage delivery pipe; A biodegradation tank, in which an anaerobic zone, an anoxic zone, and an aerobic zone are sequentially provided. The sewage delivery pipe is connected to the anaerobic zone, and both between the anaerobic zone and the anoxic zone and between the anoxic zone and the aerobic zone are connected through overflow weirs; A membrane bioreactor is installed in the aerobic zone. The membrane bioreactor is also connected to a water outlet pipe, and a suction pump is provided on the water outlet pipe; An aeration device is respectively used to supply oxygen to the anoxic zone and the aerobic zone, and the aeration device is connected to the membrane bioreactor for forming bubble disturbances on the membrane surface of the membrane bioreactor; A backwashing unit is used to wash the membrane bioreactor.

[0006] Optionally, a nitrification liquid reflux pump is provided in the aerobic zone. The nitrification liquid reflux pump is connected to a nitrification liquid reflux pipe, and the nitrification liquid reflux pipe is connected to the anoxic zone.

[0007] Optionally, the backwashing unit includes a shunt pipe, a three-way stop valve, a clean water tank, a backwashing pipe, and a backwashing pump. The shunt pipe is respectively communicated with the water outlet pipe and the clean water tank. The three-way stop valve is installed at the communicating end of the water outlet pipe and the shunt pipe. Two ends of the backwashing pipe are respectively communicated with the clean water tank and the water outlet pipe, and the communicating end of the backwashing pipe and the water outlet pipe is located between the three-way stop valve and the membrane bioreactor. The backwashing pump is installed on the backwashing pipe.

[0008] Optionally, a plurality of gas distribution pipes are fixedly arranged in the aerobic zone. Each of the gas distribution pipes is uniformly distributed at the bottom of the aerobic zone. A plurality of gas nozzles are communicated with each of the gas distribution pipes. Each of the gas distribution pipes is commonly communicated with an air inlet pipe. The aeration device is communicated with the air inlet pipe.

[0009] Optionally, a partition plate is fixedly arranged in the aerobic zone. The partition plate divides a bottom sludge discharge area at the bottom of the aerobic zone. The membrane bioreactor and the gas distribution pipes are both arranged above the partition plate. A plurality of material falling openings are formed in the partition plate. The bottom sludge discharge area is communicated with a sludge discharge pipeline. A sludge discharge pump is arranged on the sludge discharge pipeline.

[0010] Optionally, the side wall of the material falling opening is inclined, and the side wall of the material falling opening gradually approaches the bottom wall along the top wall of the partition plate. Each of the gas distribution pipes is respectively arranged between adjacent material falling openings.

[0011] Optionally, the lower side wall of the bottom sludge discharge area is provided with an inclined surface, and the inclined surface gradually inclines downward along the direction close to the sludge discharge pipeline.

[0012] Optionally, the bottom sludge discharge area is communicated with a sludge return pipe. The sludge return pipe is communicated with the anoxic zone. A sludge return pump is arranged on the sludge return pipe. A stirrer is arranged in the anoxic zone.

[0013] Optionally, an integrated controller is further included. The integrated controller is respectively electrically connected with the aeration device, the backwashing unit, the nitrification liquid reflux pump, and the sludge return pump. A dissolved oxygen sensor is arranged in the aerobic zone for real-time monitoring of the dissolved oxygen concentration. The dissolved oxygen sensor is electrically connected with the integrated controller. The integrated controller controls the aeration device to adjust the aeration intensity of the aerobic zone based on the data fed back by the dissolved oxygen sensor. An ammonia nitrogen sensor and a sludge concentration sensor are further arranged in the aerobic zone. The ammonia nitrogen sensor is used for detecting the ammonia nitrogen concentration of the water quality in the aerobic zone. The sludge concentration sensor is used for detecting the mixed liquor suspended solid concentration in the aerobic zone. The ammonia nitrogen sensor and the sludge concentration sensor are both electrically connected with the integrated controller. The integrated controller regulates the reflux ratio of the nitrification liquid reflux pump and the sludge return pump based on the ammonia nitrogen concentration and sludge concentration signals fed back by the ammonia nitrogen sensor and the sludge concentration sensor. The membrane bioreactor is provided with a transmembrane pressure difference sensor for detecting the transmembrane pressure difference between the water inlet end and the water outlet end of the membrane bioreactor. The transmembrane pressure difference sensor is electrically connected to an integrated controller, and the integrated controller dynamically adjusts the backwashing frequency of the backwashing unit based on the transmembrane pressure difference data fed back by the transmembrane pressure difference sensor.

[0014] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application realizes the integrated treatment of sewage, improves the nitrogen and phosphorus removal efficiency, and at the same time reduces the risk of membrane fouling. Specifically, the integrated design organically combines the regulating tank, the biodegradation tank and the membrane bioreactor, reduces the floor area, and lowers the construction and operation and maintenance costs; the hierarchical setting of the anaerobic zone, the anoxic zone and the aerobic zone, combined with biodegradation and membrane filtration, significantly improves the nitrogen and phosphorus removal efficiency; the aeration device forms bubble disturbances on the membrane surface of the membrane bioreactor, effectively alleviates membrane fouling, extends the membrane service life, and at the same time, the setting of the backwashing unit further reduces the risk of membrane fouling by periodically backwashing the membrane bioreactor, ensuring the long-term stable operation of the system.

[0015] 2. The present application can efficiently return the nitrified liquid in the aerobic zone to the anoxic zone through the setting of the nitrified liquid reflux pump, promote the denitrification process, significantly improve the nitrogen removal efficiency, and increase the nitrogen removal efficiency by more than 20%. At the same time, this structure optimizes the nitrogen cycle in the system, effectively alleviates the problem of low nitrogen removal efficiency in the traditional MBR system, and improves the overall sewage treatment effect.

[0016] 3. Through the uniformly distributed gas distribution pipes and gas nozzles, the present application can ensure the uniform diffusion of the oxygen sent into the aerobic zone by the aeration device in the aerobic zone, thereby enhancing the activity of nitrifying bacteria in the aerobic zone, and further improving the efficiency of ammonia nitrogen conversion into nitrate. At the same time, the setting of the gas distribution pipes and gas nozzles increases the disturbance effect on the water body in the aerobic zone, further reducing the risk of membrane fouling in the membrane bioreactor.

[0017] 4. Since some substances will still be deposited at the bottom of the aerobic zone during the disturbance process of the water body in the aerobic zone, a bottom sludge discharge area is separated at the bottom of the aerobic zone by a partition board. The deposited substances enter the bottom sludge discharge area through the material dropping port on the partition board, and cooperate with the sludge discharge pipeline and the sludge discharge pump to realize the efficient discharge of sludge; it avoids the attachment of sediments on the surface of the gas distribution pipe or the blockage of the gas nozzles, reducing the cleaning difficulty and maintenance cost.

[0018] 5. The present application realizes the intelligent control of the integrated sewage treatment equipment, significantly improving the operation efficiency and stability of the system. Specifically, through the cooperation of the integrated controller and the dissolved oxygen sensor, the aeration intensity of the aerobic zone is monitored and adjusted in real time to ensure the efficient and stable operation of the biological treatment process; through the ammonia nitrogen sensor and the sludge concentration sensor, the integrated controller can accurately regulate the reflux ratio of the nitrification liquid reflux pump and the sludge reflux pump to maintain the activated sludge concentration of the entire sewage treatment system and effectively improve the nitrogen and phosphorus removal efficiency; through the cooperation of the transmembrane pressure difference sensor and the integrated controller, the backwashing frequency of the backwashing unit is dynamically adjusted according to the transmembrane pressure difference data of the membrane bioreactor, significantly reducing the risk of membrane pollution and extending the service life of the membrane. Description of the Drawings

[0019] Figure 1 is the overall process schematic diagram of the embodiment of the present application; Figure 2 is the structural schematic diagram for expressing the aerobic zone in the embodiment of the present application; Figure 3 is the control circuit flowchart of the embodiment of the present application.

[0020] Description of the reference numerals: 1, regulating tank; 11, stirring device; 12, lift pump; 13, sewage delivery pipe; 2, biodegradation tank; 21, anaerobic zone; 22, anoxic zone; 221, mixer; 23, aerobic zone; 231, nitrification liquid reflux pump; 232, nitrification liquid reflux pipe; 233, gas distribution pipe; 234, gas nozzle; 235, intake pipe; 24, partition board; 241, falling port; 25, bottom sludge discharge area; 251, sludge discharge pipe; 252, sludge discharge pump; 253, sludge reflux pipe; 254, sludge reflux pump; 3, membrane bioreactor; 31, outlet pipe; 32, suction pump; 4, aeration device; 41, air supply pipe; 42, pressure regulating valve; 5, backwashing unit; 51, shunt pipe; 52, three-way stop valve; 53, clean water tank; 54, backwashing pipe; 55, backwashing pump; 56, liquid level sensor; 6, integrated controller; 61, dissolved oxygen sensor; 62, ammonia nitrogen sensor; 63, sludge concentration sensor; 64, transmembrane pressure difference sensor. Detailed Embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the attached Figure 1 - attached Figure 3 , and the described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can fully combine the embodiments of the present invention to obtain other embodiments without creative labor, and these embodiments are also within the protection scope of the present invention.

[0022] The inventors of the present application have found that existing MBR sewage treatment systems have problems such as serious membrane fouling and low nitrogen and phosphorus removal efficiency, making it difficult to effectively meet the treatment requirements of high-concentration nitrogen and phosphorus sewage. For this reason, the present application discloses an integrated sewage treatment device, mainly adopting the following solutions: An embodiment of the present application discloses an integrated sewage treatment device. Refer to Figure 1 , which includes an adjustment tank 1, a biodegradation tank 2, a membrane bioreactor 3, an aeration device 4 and a backwashing unit 5. Among them, the adjustment tank 1 is used for preliminary stirring of sewage, adjusting water quality and water volume. An anaerobic zone 21, an anoxic zone 22 and an aerobic zone 23 are provided in the biodegradation tank 2. The membrane bioreactor 3 is installed in the aerobic zone 23 to carry out biodegradation and membrane filtration of sewage. The aeration device 4 provides oxygen for each area and forms bubble disturbance on the membrane surface, and the backwashing unit 5 is used to clean the membrane module regularly. Through the above structural design, the problems existing in the traditional MBR system are effectively solved, the integrated treatment of sewage is realized, the nitrogen and phosphorus removal efficiency is improved, and the risk of membrane fouling is reduced at the same time.

[0023] Refer to Figure 1 , specifically, a stirring device 11 and a lift pump 12 are provided in the adjustment tank 1. The stirring device 11 can adopt a mechanical stirring paddle or a hydraulic stirrer, and its function is to evenly distribute the pollutants in the sewage to facilitate subsequent treatment. The lift pump 12 adopts a centrifugal pump. The water outlet end of the lift pump 12 is connected to a sewage delivery pipe 13, and the sewage delivery pipe 13 is connected to the anaerobic zone 21 in the biodegradation tank 2 for delivering sewage into the anaerobic zone 21 of the biodegradation tank 2.

[0024] Refer to Figure 1 , the anaerobic zone 21, the anoxic zone 22 and the aerobic zone 23 are respectively connected through overflow weirs. In the anaerobic zone 21, polyphosphate-accumulating organisms decompose the stored polyphosphate in their bodies under anaerobic conditions to release energy, absorb volatile fatty acids in the sewage, and release phosphorus into the water body at the same time; while macromolecular organic substances (such as proteins, fats) are hydrolyzed into small-molecular organic substances (such as acetic acid, propionic acid) to provide a carbon source for subsequent denitrification and phosphorus uptake. In the anoxic zone 22, denitrifying bacteria use organic substances as a carbon source to reduce nitrates or nitrites to nitrogen gas. In the aerobic zone 23, ammonia nitrogen is oxidized to nitrate by nitrifying bacteria (such as Nitrosomonas, Nitrobacter); polyphosphate-accumulating organisms absorb phosphorus in the water body in excess under aerobic conditions and store it as polyphosphate in their bodies; while heterotrophic bacteria decompose the remaining organic substances into carbon dioxide and water.

[0025] Refer to Figure 1 、 2, a nitrification liquid reflux pump 231 is added in the aerobic zone 23. The nitrification liquid reflux pump 231 adopts a corrosion-resistant centrifugal pump, and its head and flow rate are determined according to actual requirements. The nitrification liquid reflux pump 231 is connected with a nitrification liquid reflux pipe 232. The nitrification liquid reflux pipe 232 extends to the bottom position of the anoxic zone 22 and is connected with the anoxic zone 22. Through the nitrification liquid reflux pump 231 and the nitrification liquid reflux pipe 232, the nitrification liquid in the aerobic zone 23 can be efficiently refluxed to the anoxic zone 22, promoting the denitrification process, significantly improving the nitrogen removal efficiency, and increasing the nitrogen removal efficiency by more than 20%. At the same time, the nitrogen cycle in the system is optimized, effectively alleviating the problem of low nitrogen removal efficiency in the traditional MBR system and improving the overall sewage treatment effect.

[0026] Refer to Figure 1 , the membrane bioreactor 3 is arranged in the aerobic zone 23. The membrane module of the membrane bioreactor 3 can be selected from hollow fiber membranes, flat membranes, tubular membranes, etc., and its material is usually polyvinylidene fluoride (PVDF) or polyethersulfone (PES). The water outlet end of the membrane bioreactor 3 is connected with a water outlet pipe 31, and a suction pump 32 is arranged on the water outlet pipe 31. The suction pump 32 adopts a vacuum pump or a pneumatic diaphragm pump and is used to pump out the clear water after membrane filtration.

[0027] Refer to Figure 1 , the aeration device 4 adopts a Roots blower or a centrifugal blower. The aeration device 4 is connected with the anoxic zone 22, the aerobic zone 23 and the membrane bioreactor 3 respectively through an air supply pipe 41, and is used to supply oxygen to the aerobic zone 23 and the anoxic zone 22 and form bubble disturbance on the membrane surface of the membrane bioreactor 3. A pressure regulating valve 42 is arranged on each air supply pipe 41.

[0028] Refer to Figure 2 , a plurality of gas distribution pipes 233 are fixedly arranged in the aerobic zone 23. The gas distribution pipes 233 are evenly distributed at the bottom of the aerobic zone 23. A plurality of air nozzles 234 are arranged on each gas distribution pipe 233. The gas distribution pipes 233 are jointly connected with an air inlet pipe 235. The air supply pipe 41 is connected with the air inlet pipe 235. The material of the air nozzle 234 is ceramic or stainless steel, its shape is circular or polygonal, and the aperture range of the air nozzle 234 outlet is 0.1 - 1 mm. This layout ensures the uniform distribution of oxygen in the aerobic zone 23, enhances the activity of nitrifying bacteria, and improves the efficiency of ammonia nitrogen conversion into nitrate. At the same time, the setting of the gas distribution pipes 233 and the air nozzles 234 increases the disturbance effect on the water body in the aerobic zone 23 and further reduces the risk of membrane pollution of the membrane bioreactor 3.

[0029] Refer to Figure 2, a partition plate 24 is fixedly arranged in the aerobic zone 23. The partition plate 24 is horizontally arranged, and a bottom sludge discharge zone 25 is separated at the bottom of the aerobic zone 23. The membrane bioreactor 3 and the gas distribution pipes 233 are both arranged above the partition plate 24. A plurality of material dropping ports 241 are formed in the partition plate 24. The side wall of the material dropping port 241 is inclined, and the side wall of the material dropping port 241 gradually approaches the bottom wall from the top wall of the partition plate 24. Each gas distribution pipe 233 is respectively arranged between adjacent material dropping ports 241. Since during the disturbance process of the water body in the aerobic zone 23, some substances will still be deposited at the bottom of the aerobic zone 23. The bottom sludge discharge zone 25 is separated at the bottom of the aerobic zone 23 through the partition plate 24. The deposited substances enter the bottom sludge discharge zone 25 through the material dropping ports 241 on the partition plate 24. And by respectively arranging each gas distribution pipe 233 between adjacent material dropping ports 241, it avoids the attachment of sediments on the surface of the gas distribution pipes 233 or the blockage of the gas nozzles 234, reducing the cleaning difficulty and maintenance cost.

[0030] Refer to Figure 2 , a sludge discharge pipe 251 is communicated with the bottom sludge discharge zone 25. A sludge discharge pump 252 is arranged on the sludge discharge pipe 251. The lower side wall of the bottom sludge discharge zone 25 is provided with an inclined surface, which gradually slopes downward along the direction close to the sludge discharge pipe 251, so that the sediments in the bottom sludge discharge zone 25 gather towards the direction close to the sludge discharge pipe 251. Through the cooperation of the sludge discharge pipe 251 and the sludge discharge pump 252, the efficient discharge of sludge is realized.

[0031] Refer to Figure 1 , 2 , in addition, a sludge return pipe 253 is also communicated with the bottom sludge discharge zone 25. The sludge return pipe 253 is communicated with the anoxic zone 22. A sludge return pump 254 is arranged on the sludge return pipe 253. The sludge return pump 254 is used to control the sludge return flow rate. A stirrer 221 is arranged in the anoxic zone 22. The setting of the sludge return pump 254 can accurately control the sludge return flow rate, ensure that the concentration of activated sludge in the system is maintained within a reasonable range, and further improve the nitrogen and phosphorus removal efficiency.

[0032] Refer to Figure 1, the backwashing unit 5 includes a shunt pipe 51, a three-way stop valve 52, a clean water tank 53, a backwash pipe 54, and a backwash pump 55. The clean water tank 53 is installed outside the biodegradation tank 2. The shunt pipe 51 is respectively connected to the water outlet pipe 31 and the clean water tank 53, and the connection end of the shunt pipe 51 and the water outlet pipe 31 is located between the suction pump 32 and the membrane bioreactor 3. The three-way stop valve 52 is installed at the connection end of the water outlet pipe 31 and the shunt pipe 51. The clean water tank 53 is used to store backwashing water, and its volume can be determined according to actual needs. Both ends of the backwash pipe 54 are respectively connected to the clean water tank 53 and the water outlet pipe 31, and the connection end of the backwash pipe 54 and the water outlet pipe 31 is located between the three-way stop valve 52 and the membrane bioreactor 3. The backwash pump 55 is installed on the backwash pipe 54, and the backwash pump 55 uses a centrifugal pump or a plunger pump. When it is necessary to backwash the membrane bioreactor 3, the three-way stop valve 52 is closed to block both the water outlet pipe 31 and the shunt pipe 51, and the clean water in the clean water tank 53 is transported to the membrane bioreactor 3 by the backwash pump 55 at an appropriate pressure to strongly wash the membrane surface and remove the attached pollutants. At the same time, the aeration device 4 is used to form bubble disturbances on the membrane surface to improve the backwashing effect on the membrane surface.

[0033] Refer to Figure 2 , 3 , it further includes an integrated controller 6, a dissolved oxygen sensor 61, an ammonia nitrogen sensor 62, a sludge concentration sensor 63, and a transmembrane pressure difference sensor 64. The dissolved oxygen sensor 61, the ammonia nitrogen sensor 62, the sludge concentration sensor 63, and the transmembrane pressure difference sensor 64 are all electrically connected to the integrated controller 6. The integrated controller 6 is respectively electrically connected to the aeration device 4, the backwashing unit 5, the nitrification liquid reflux pump 231, and the sludge reflux pump 254.

[0034] Refer to Figure 2 , specifically, the dissolved oxygen sensor 61 is installed in the aerobic zone 23 for real-time monitoring of the dissolved oxygen concentration in the aerobic zone 23. The integrated controller 6 controls the aeration intensity of the aerobic zone 23 based on the dissolved oxygen concentration data fed back by the dissolved oxygen sensor 61 to ensure the efficient and stable operation of the biological treatment process.

[0035] Refer to Figure 2 , the ammonia nitrogen sensor 62 and the sludge concentration sensor 63 are both arranged in the aerobic zone 23, and are respectively used to detect the ammonia nitrogen concentration and the mixed liquor suspended solid concentration in the aerobic zone 23. The integrated controller 6 regulates the reflux ratio of the nitrification liquid reflux pump 231 and the sludge reflux pump 254 based on the ammonia nitrogen concentration and sludge concentration signals fed back by the ammonia nitrogen sensor 62 and the sludge concentration sensor 63 to maintain the activated sludge concentration of the entire sewage treatment system and effectively improve the nitrogen and phosphorus removal efficiency.

[0036] Refer to Figure 2The transmembrane pressure difference sensor 64 is arranged on the membrane bioreactor 3, and is used to detect the transmembrane pressure difference between the water inlet and the water outlet of the membrane bioreactor 3. The integrated controller 6 dynamically adjusts the backwashing frequency of the backwashing unit 5 based on the feedback data, significantly reducing the risk of membrane contamination and extending the service life of the membrane. Specifically, the integrated controller 6 is electrically connected to the three-way stop valve 52 and the backwashing pump 55 of the backwashing unit 5. When the transmembrane pressure difference exceeds the threshold, the integrated controller 6 controls the three-way stop valve 52 to close and simultaneously close the outlet pipe 31 and the diversion pipe 51, and the clean water in the clean water tank 53 is transported to the membrane bioreactor 3 at an appropriate pressure through the backwashing pump 55, and the membrane surface is strongly flushed to remove the attached pollutants. At the same time, the aeration device 4 is cooperated to form bubble disturbance on the membrane surface to improve the flushing effect on the membrane surface.

[0037] Reference Figure 1 , 3 Furthermore, a liquid level sensor 56 is also provided in the clean water tank 53, and the liquid level sensor 56 is electrically connected to the integrated controller 6. The liquid level in the clean water tank 53 is monitored in real time through the liquid level sensor 56. When the water level in the clean water tank 53 is lower than a certain value, the integrated controller 6 controls the three-way stop valve 52 to switch the water flow direction, so that the diversion pipe 51 is connected with the water outlet pipe 31, and the clean water is introduced into the clean water tank 53 for storage.

[0038] The implementation principle of an integrated sewage treatment equipment in an embodiment of the present application is as follows: the sewage is preliminarily stirred through the regulating tank 1 to make the pollutants evenly distributed, and then the sewage is sent to the biodegradation tank 2 by the lifting pump 12. In the biodegradation tank 2, the sewage is treated in the anaerobic zone 21, the anoxic zone 22 and the aerobic zone 23 in turn, realizing the processes such as organic matter decomposition, nitrate nitrogen removal and ammonia nitrogen nitrification. The membrane bioreactor 3 in the aerobic zone 23 ensures that the effluent water quality meets the standard through solid-liquid separation. At the same time, the oxygen provided by the aeration device 4 not only meets the growth needs of aerobic microorganisms, but also reduces the risk of membrane contamination through bubble disturbance. The backwash unit 5 regularly cleans the membrane bioreactor 3, further extending the service life of the membrane. The overall structural design is compact and the operation is stable, which significantly improves the efficiency of nitrogen removal and phosphorus removal and reduces maintenance costs.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An integrated sewage treatment equipment, characterized in that: include: A regulating tank (1), wherein a stirring device (11) for stirring sewage is arranged in the regulating tank (1), a lifting pump (12) is arranged in the regulating tank (1), and the lifting pump (12) is connected to a sewage conveying pipe (13); A biodegradation pool (2), wherein an anaerobic zone (21), an anoxic zone (22), and an aerobic zone (23) are sequentially arranged in the biodegradation pool (2), the sewage delivery pipe (13) is connected to the anaerobic zone (21), and the anaerobic zone (21) and the anoxic zone (22), as well as the anoxic zone (22) and the aerobic zone (23) are all connected via an overflow weir; A membrane bioreactor (3) is installed in the aerobic zone (23), and the membrane bioreactor (3) is also connected to a water outlet pipe (31), and a suction pump (32) is provided on the water outlet pipe (31); an aeration device (4), used for supplying oxygen to the anoxic zone (22) and the aerobic zone (23), respectively, and the aeration device (4) is connected to the membrane bioreactor (3) and used for forming bubble disturbance on the membrane surface of the membrane bioreactor (3); The backwashing unit (5) is used for flushing the membrane bioreactor (3).

2. The integrated sewage treatment equipment according to claim 1, characterized in that: A nitrification liquid reflux pump (231) is arranged in the aerobic zone (23), the nitrification liquid reflux pump (231) is connected to a nitrification liquid reflux pipe (232), and the nitrification liquid reflux pipe (232) is connected to the anoxic zone (22).

3. The integrated sewage treatment equipment according to claim 1, characterized in that: The backwash unit (5) comprises a shunt pipe (51), a three-way stop valve (52), a clean water tank (53), a backwash pipe (54) and a backwash pump (55); the shunt pipe (51) is connected to the outlet pipe (31) and the clean water tank (53) respectively; the three-way stop valve (52) is installed at the connecting end between the outlet pipe (31) and the shunt pipe (51); the two ends of the backwash pipe (54) are connected to the clean water tank (53) and the outlet pipe (31) respectively; and the connecting end between the backwash pipe (54) and the outlet pipe (31) is located between the three-way stop valve (52) and the membrane bioreactor (3); and the backwash pump (55) is installed on the backwash pipe (54).

4. The integrated sewage treatment equipment according to claim 2, characterized in that: A plurality of gas distribution pipes (233) are fixedly arranged in the aerobic zone (23), each of the gas distribution pipes (233) is evenly distributed at the bottom of the aerobic zone (23), each of the gas distribution pipes (233) is connected to a plurality of gas nozzles (234), each of the gas distribution pipes (233) is commonly connected to an air inlet pipe (235), and the aeration device (4) is connected to the air inlet pipe (235).

5. The integrated sewage treatment equipment according to claim 4, characterized in that: A partition (24) is fixedly arranged in the aerobic zone (23), and the partition (24) separates a bottom silt discharge zone (25) at the bottom of the aerobic zone (23). The membrane bioreactor (3) and the gas distribution pipe (233) are both arranged above the partition (24), and a plurality of discharge ports (241) are opened on the partition (24). The bottom silt discharge zone (25) is connected to a silt discharge pipeline (251), and a silt discharge pump (252) is arranged on the silt discharge pipeline (251).

6. The integrated sewage treatment equipment according to claim 5, characterized in that: The side walls of the material drop opening (241) are arranged at an angle, and gradually approach the bottom wall along the top wall of the partition (24), and each of the gas distribution pipes (233) is arranged between adjacent material drop openings (241).

7. The integrated sewage treatment equipment according to claim 6, characterized in that: The lower side wall of the bottom silt discharge area (25) is provided with an inclined surface, and gradually slopes downward in a direction close to the silt discharge pipe (251).

8. The integrated sewage treatment equipment according to claim 5, characterized in that: The bottom silt discharge area (25) is connected to a sludge return pipe (253), the sludge return pipe (253) is connected to the anoxic area (22), a sludge return pump (254) is arranged on the sludge return pipe (253), and a mixer (221) is arranged in the anoxic area (22).

9. The integrated sewage treatment equipment according to claim 8, characterized in that: It also includes an integrated controller (6), wherein the integrated controller (6) is electrically connected to the aeration device (4), the backwash unit (5), the nitrification liquid return pump (231) and the sludge return pump (254) respectively; A dissolved oxygen sensor (61) is provided in the aerobic zone (23) for real-time monitoring of dissolved oxygen concentration. The dissolved oxygen sensor (61) is electrically connected to an integrated controller (6). The integrated controller (6) controls the aeration device (4) to adjust the aeration intensity of the aerobic zone (23) based on data fed back by the dissolved oxygen sensor (61). The aerobic zone (23) is also provided with an ammonia nitrogen sensor (62) and a sludge concentration sensor (63). The ammonia nitrogen sensor (62) is used to detect the ammonia nitrogen concentration of the water quality in the aerobic zone (23). The sludge concentration sensor (63) is used to detect the suspended solid concentration of the mixed liquid in the aerobic zone (23). The ammonia nitrogen sensor (62) and the sludge concentration sensor (63) are both electrically connected to the integrated controller (6). The integrated controller (6) controls the reflux ratio of the nitrification liquid reflux pump (231) and the sludge reflux pump (254) based on the ammonia nitrogen concentration and sludge concentration signals fed back by the ammonia nitrogen sensor (62) and the sludge concentration sensor (63). The membrane bioreactor (3) is provided with a transmembrane pressure difference sensor (64) for detecting the transmembrane pressure difference between the water inlet and the water outlet of the membrane bioreactor (3); the transmembrane pressure difference sensor (64) is electrically connected to the integrated controller (6); and the integrated controller (6) dynamically adjusts the backwash frequency of the backwash unit (5) based on the transmembrane pressure difference data fed back by the transmembrane pressure difference sensor (64).

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