Modular integrated sewage treatment equipment and sewage treatment method thereof

Abstract

The invention discloses modular integrated sewage treatment equipment and a sewage treatment method thereof, and relates to the technical field of sewage treatment.The modular integrated sewage treatment equipment comprises an adjusting tank, an MBR module and a clean water tank; the regulating tank is used for regulating water quality and water quantity, the MBR module comprises an anoxic tank, an aerobic tank, a membrane bioreactor, a suction pump and an aeration device, the sewage delivery pipe is communicated with the anoxic tank, the anoxic tank is communicated with the aerobic tank through an overflow dam, the membrane bioreactor is mounted in the aerobic tank and connected with a water outlet pipe, the water outlet pipe is communicated with the clean water tank, and the clean water tank is communicated with the sewage delivery pipe. The aeration device is used for supplying oxygen into the aerobic tank, and the aeration device is communicated with the membrane bioreactor and is used for forming bubble disturbance on the membrane surface of the membrane bioreactor. Through the modular integrated structural design of the regulating tank, the MBR module and the clean water tank, the occupied area is effectively reduced, and the problems of low connection efficiency and large hydraulic loss among modules in a traditional distributed multi-unit combined process are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a modular integrated sewage treatment device and a sewage treatment method thereof. Background Art

[0002] Current wastewater treatment technologies primarily include activated sludge, biofilm, and MBR. MBR, also known as membrane bioreactor, is a novel water treatment technology that combines membrane separation technology. Due to its efficient solid-liquid separation capabilities and excellent effluent quality, MBR technology has gradually become a mainstream technology in wastewater treatment.

[0003] However, traditional MBR wastewater treatment systems often utilize a decentralized, multi-unit combination process, such as a combination of a regulating tank, a biological reactor (anoxic tank, an aerobic tank), and a secondary sedimentation tank. Each unit in this process has a distinct function, allowing treatment tailored to the characteristics of wastewater at different stages to achieve different treatment goals. However, while traditional decentralized, multi-unit combination processes offer clear unit functions, they occupy a large footprint and suffer from inefficient connections between modules, resulting in significant hydraulic losses and impacting treatment efficiency and energy consumption. Summary of the Invention

[0004] In response to the problems existing in the prior art, the present application provides a modular integrated sewage treatment equipment and a sewage treatment method thereof.

[0005] In the first aspect, the present application provides a modular integrated sewage treatment equipment, which adopts the following technical solutions: A modular integrated sewage treatment equipment, comprising a regulating tank, an MBR module and a clear water tank; a stirrer is provided in the regulating tank for regulating water quality and water quantity, a lifting pump is provided in the regulating tank, and the lifting pump is connected to a sewage delivery pipe; the MBR module comprises an anoxic tank, an aerobic tank, a membrane bioreactor, a suction pump and an aeration device, the sewage delivery pipe is connected to the anoxic tank, the anoxic tank and the aerobic tank are connected via an overflow dam, the membrane bioreactor is installed in the aerobic tank, the membrane bioreactor is connected to an outlet pipe, the outlet pipe is connected to the clear water tank, the suction pump is installed on the outlet pipe, the aeration device is used to supply oxygen to the aerobic tank, and the aeration device is connected to the membrane bioreactor to form bubble disturbance on the membrane surface of the membrane bioreactor.

[0006] Optionally, a water filter trough is fixedly provided on the side wall of the regulating tank module, a water outlet communicating with the regulating tank is opened on the side wall of the water filter trough, and a coarse grid is provided at the water outlet.

[0007] Optionally, a sedimentation tank is provided outside the aerobic tank, the aerobic tank is provided with a connection port connected to the sedimentation tank, the bottom of the sedimentation tank is connected to a sewage pipe, the sewage pipe is connected to a sludge tank, and a dredging pump is provided on the sewage pipe.

[0008] Optionally, a mud guide plate is provided in the aerobic tank, and the mud guide plate is arranged to be tilted downward in a direction close to the connection port, so as to guide the sediment in the aerobic tank into the sedimentation tank.

[0009] Optionally, a water-blocking strip is fixedly installed in the aerobic pool and above the mud guide plate. The water-blocking strip includes a frame and a plurality of baffles arranged in the frame. The length directions of the baffles are parallel, and the baffles are inclined vertically, and adjacent baffles are spaced apart.

[0010] Optionally, a partition is provided in the sedimentation tank, the partition is provided above the connection port, a plurality of water filtration holes are opened on the partition, a reverse filter filler layer is provided above the partition, a nitrification liquid reflux pump is provided in the sedimentation tank and above the reverse filter filler layer, the nitrification liquid reflux pump is connected to a nitrification liquid reflux pipe, and the nitrification liquid reflux pipe is connected to the anoxic tank.

[0011] Optionally, a sludge return pump is provided in the sedimentation tank and below the partition, the sludge return pump is connected to a sludge return pipe, the sludge return pipe is connected to the anoxic tank, and a turbine agitator is provided in the anoxic tank.

[0012] Optionally, an ammonia nitrogen sensor and a sludge concentration sensor are also provided in the aerobic tank. The ammonia nitrogen sensor is used to detect the ammonia nitrogen concentration of the water quality in the aerobic tank, and the sludge concentration sensor is used to detect the suspended solids concentration of the mixed liquor in the aerobic tank. The ammonia nitrogen sensor and the sludge concentration sensor are electrically connected to a control system, and the control system is electrically connected to the nitrification liquid reflux pump and the sludge reflux pump respectively. The control system adjusts the reflux ratio of the nitrification liquid reflux pump and the sludge reflux pump based on the ammonia nitrogen concentration and sludge concentration signals fed back by the ammonia nitrogen sensor and the sludge concentration sensor.

[0013] Optionally, a backwash pump is provided in the clean water tank, the backwash pump is connected to a backwash pipe, the backwash pipe is connected to the outlet pipe, and the connecting end of the backwash pipe and the outlet pipe is located on the side of the suction pump close to the membrane bioprocessor.

[0014] In a second aspect, the present application provides a sewage treatment method of a modular integrated sewage treatment equipment, which adopts the following technical solution: A sewage treatment method of a modular integrated sewage treatment equipment comprises the following steps: S1. The sewage enters the regulating tank, and the water quality and water volume in the regulating tank are adjusted by the mixer to make the pollutants in the sewage evenly distributed; S2. The sewage in the regulating tank is transported to the anoxic tank through a lifting pump and a sewage delivery pipe. In the anoxic tank, there are a large number of facultative anaerobic bacteria. In the anoxic environment, these microorganisms use the organic carbon source in the sewage as an electron donor to reduce nitrate and nitrite to nitrogen gas, realizing the denitrification process; S3. The sewage in the anoxic tank then flows through the overflow dam into the aerobic tank. In the aerobic tank, ammonia nitrogen is oxidized into nitrate by nitrifying bacteria. Under aerobic conditions, phosphate-accumulating bacteria absorb excessive phosphorus in the water to form polyphosphates. Heterotrophic bacteria decompose the remaining organic matter into carbon dioxide and water. S4. The water filtered by the membrane bioreactor is transported to the clean water tank through the outlet pipe by a suction pump. During this process, the aeration device supplies oxygen to the aerobic tank and forms bubble disturbance on the membrane surface of the membrane bioreactor to prevent membrane pollution and realize sewage treatment and collection.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. This application effectively reduces the floor space through the modular integrated structural design of the regulating tank, MBR module and clear water tank, and avoids the problems of low connection efficiency and large hydraulic loss between modules of the traditional decentralized multi-unit combination process; specifically, the mixer can adjust the water quality and water volume in the regulating tank, and the lifting pump cooperates with the sewage delivery pipe to transport the sewage to the MBR module. The hierarchical setting of the anoxic tank and the aerobic tank, combined with biodegradation and membrane filtration, significantly improves the efficiency of nitrogen and phosphorus removal; the aeration device supplies oxygen to the aerobic tank and forms bubble disturbance on the membrane surface of the membrane bioreactor, which is beneficial to the biological reaction in the aerobic tank and prevents membrane pollution; the membrane bioreactor cooperates with the suction pump and the outlet pipe to transport the treated water to the clear water tank to realize sewage treatment and collection.

[0016] 2. This application sets up a sedimentation tank outside the aerobic tank, which can effectively collect impurities deposited in the aerobic tank; the bottom of the sedimentation tank is connected to the sludge tank through a sewage pipe, and the precipitated sludge can be discharged to the sludge tank using a dredging pump, thereby achieving effective treatment of sediments in the aerobic tank, avoiding long-term accumulation of sludge in the aerobic tank that affects the biological reaction effect, and improving the sewage treatment efficiency and stability of the equipment.

[0017] 3. The present application can block and divert the water flow in the aerobic pool by setting up the water-blocking strips, reduce the disturbance to the water body below the water-blocking strips, help the precipitation of impurities, and improve the sewage treatment effect.

[0018] 4. This application, by installing a baffle with a water filter hole above the connection port in the sedimentation tank and a filter packing layer above the baffle, can filter the sewage flowing from the aerobic tank into the sedimentation tank, remove impurities and some suspended matter, and improve the sedimentation effect. Furthermore, the installation of a nitrification liquid return pump can efficiently return the nitrification liquid above the sedimentation area to the anoxic tank, promoting the denitrification process and significantly improving the denitrification efficiency by more than 20%. At the same time, this structure optimizes the nitrogen cycle within the system, effectively alleviating the problem of low denitrification efficiency in traditional MBR systems, and further improving the overall sewage treatment effect.

[0019] 5. This application uses ammonia nitrogen sensors and sludge concentration sensors to detect the ammonia nitrogen concentration and sludge concentration in the aerobic tank, and cooperates with the control system to accurately control the reflux ratio of the nitrification liquid return pump and the sludge return pump to ensure that the activated sludge concentration in the system is maintained within a reasonable range, further improving the denitrification and phosphorus removal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the overall process flow chart of the embodiment of the present application; Figure 2 It is a schematic diagram of the structure of the aerobic tank used in the embodiment of the present application.

[0021] Explanation of reference numerals: 1. regulating tank; 11. water filter; 12. coarse screen; 13. mixer; 14. lifting pump; 15. sewage delivery pipe; 2. MBR module; 21. anoxic tank; 211. turbine agitator; 22. aerobic tank; 221. connection port; 222. mud guide plate; 223. ammonia nitrogen sensor; 224. sludge concentration sensor; 23. membrane bioreactor; 231. outlet pipe; 24. suction pump; 25. aeration device; 25 1. Microporous bubble generator; 252. Air supply pipe; 253. Pressure regulating valve; 26. Sedimentation tank; 261. Drain pipe; 262. Desilting pump; 263. Partition; 264. Back filter packing layer; 265. Nitrification liquid reflux pump; 266. Nitrification liquid reflux pipe; 267. Sludge reflux pump; 268. Sludge reflux pipe; 27. Sludge tank; 3. Clear water tank; 31. Backwash pump; 32. Backwash pipe; 4. Water-blocking strips; 41. Frame; 42. Baffle. DETAILED DESCRIPTION

[0022] The following will be combined with the Figure 1 -Attached Figure 2 The technical solutions in the embodiments of the present invention are clearly and completely described. The described embodiments are only possible technical implementations of the present invention and do not constitute a complete set of implementations. Those skilled in the art can combine the embodiments of the present invention to derive other embodiments without inventive work, and such embodiments are also within the scope of protection of the present invention.

[0023] The inventors of this application have discovered that traditional MBR sewage treatment systems mostly use a decentralized multi-unit combination process. Although this process has clear unit functions, it occupies a large area and has low connection efficiency between modules, resulting in large hydraulic losses, affecting treatment efficiency and energy consumption. To this end, this application discloses a modular integrated sewage treatment equipment and sewage treatment method, which mainly adopts the following scheme: The present application embodiment discloses a modular integrated sewage treatment equipment. Figure 1 , including a regulating tank 1, an MBR module 2 and a clear water tank 3. Among them, the regulating tank 1 is used to preliminarily regulate the sewage water quality and water volume so that the pollutants in the sewage are evenly distributed. The MBR module 2 performs biological treatment and membrane filtration on the sewage. The clear water tank 3 is used to collect the treated water. The three cooperate with each other to form an integrated sewage treatment system, which realizes efficient treatment of sewage and avoids the problems of low connection efficiency and large hydraulic loss between modules in traditional decentralized multi-unit combination process.

[0024] Reference Figure 1 The side wall of the regulating tank 1 module is fixedly provided with a water filter trough 11, which is generally made of welded steel plates and has good sealing and strength. The side wall of the water filter trough 11 is provided with a water inlet connected to the regulating tank 1, and a coarse screen 12 is provided at the water inlet. The coarse screen 12 is usually made of metal bars and arranged in a grid shape, and the spacing between them can be adjusted according to actual needs. The function of the coarse screen 12 is to intercept larger debris in the sewage, such as branches, plastic bottles, etc., to prevent these debris from entering the regulating tank 1 and causing damage to subsequent equipment, thereby improving the reliability and stability of the entire sewage treatment equipment.

[0025] Reference Figure 1 , a stirrer 13 and a lifting pump 14 are provided in the regulating tank 1. The stirrer 13 generally adopts a paddle stirrer 13, and the blades of the paddle stirrer 13 are usually made of stainless steel and have corrosion-resistant properties. It is installed inside the regulating tank 1 and is driven to rotate by a motor to stir the sewage in the regulating tank 1, thereby adjusting the water quality and water quantity and making the pollutants in the sewage evenly distributed. Of course, a propeller stirrer 13 can also be used. The propeller stirrer 13 has a simple structure and high stirring efficiency and can also play the role of regulating sewage. The lifting pump 14 can be a centrifugal pump. The impeller of the centrifugal pump rotates at high speed to generate centrifugal force, thereby transporting the sewage out. It is connected to the regulating tank 1 through a pipeline and is connected to a sewage delivery pipe 15. After the lifting pump 14 is started, the sewage in the regulating tank 1 can be transported to the subsequent treatment module through the sewage delivery pipe 15.

[0026] Reference Figure 1MBR module 2 includes an anoxic tank 21, an aerobic tank 22, a membrane bioreactor 23, a suction pump 24, and an aerator 25. The anoxic tank 21 is connected to the sewage pipeline 15, with sewage initially entering the anoxic tank 21. The anoxic and aerobic tanks 21 and 22 are connected by an overflow dam. Within the anoxic tank 21, a large number of facultative anaerobic bacteria exist. Under anoxic conditions, these microorganisms use the organic carbon source in the sewage as an electron donor to reduce nitrate and nitrite to nitrogen gas, achieving denitrification. For example, denitrifying bacteria convert nitrate ions into nitrite ions, which are then further converted into nitric oxide and nitrous oxide, ultimately converting to nitrogen gas and expelling it from the water. In the aerobic tank 22, ammonia nitrogen is oxidized to nitrate by nitrifying bacteria (such as Nitrosomonas and Nitrobacter). Under aerobic conditions, phosphate-accumulating bacteria absorb excess phosphorus from the water, forming polyphosphates. Heterotrophic bacteria decompose the remaining organic matter into carbon dioxide and water.

[0027] Reference Figure 1 The membrane bioreactor 23 is vertically mounted within the aerobic tank 22. The membrane assembly of the membrane bioreactor 23 can be made of hollow fiber membranes, flat sheet membranes, or tubular membranes, typically made of polyvinylidene fluoride (PVDF) or polyethersulfone (PES). The outlet of the membrane bioreactor 23 is connected to an outlet pipe 231, which is connected to the clean water tank 3. A suction pump 24 is mounted on the outlet pipe 231. The suction pump 24 can be a diaphragm pump or a screw pump, and it can transport the filtered water from the membrane bioreactor 23 to the clean water tank 3 through the outlet pipe 231.

[0028] Reference Figure 1 、 2 The aeration device 25 is used to supply oxygen to the aerobic tank 22, thereby enhancing the activity of nitrifying bacteria and improving the efficiency of converting ammonia nitrogen into nitrate. At the same time, the disturbance effect on the water body in the aerobic tank 22 is increased, thereby promoting the biological reaction in the aerobic tank 22. The aeration device 25 is connected to the membrane bioreactor 23 and is used to form bubble disturbance on the membrane surface of the membrane bioreactor 23. Specifically, the aeration device 25 adopts a Roots blower or a centrifugal blower, and a microporous bubble generator 251 is provided in the aerobic tank 22. The microporous bubble generator 251 is fixedly arranged on the side wall of the aerobic tank 22 near the anoxic tank 21. The aeration device 25 is connected to two air supply pipes 252, one of which is connected to the membrane bioreactor 23, and the other is connected to the microporous bubble generator 251. A pressure regulating valve 253 is provided on each air supply pipe 252.

[0029] Reference Figure 1A backwash pump 31 is installed in the clean water tank 3. A self-priming pump can be used. Self-priming pumps have strong self-priming capabilities and are easy to operate. A backwash pipe 32 is connected to the backwash pump 31. The backwash pipe 32 is connected to the outlet pipe 231, and the connecting end of the backwash pipe 32 and the outlet pipe 231 is located on the side of the suction pump 24 near the membrane bioreactor. When the membrane bioreactor 23 needs to be cleaned, the backwash pump 31 reverses the flow of water from the clean water tank 3 to the membrane bioreactor 23 through the backwash pipe 32 to flush the membrane surface and prevent membrane contamination. Simultaneously, the aeration device 25 cooperates to create bubble disturbances on the membrane surface, improving the flushing effect on the membrane surface.

[0030] Reference Figure 1 、 2 A sedimentation tank 26 is located outside the aerobic tank 22. Sedimentation tank 26 is located on the side of the aerobic tank 22 away from the anoxic tank 21. A connection port 221 is provided on the sidewall of the aerobic tank 22, communicating with the sedimentation tank 26. A sewage pipe 261 is connected to the bottom of the sedimentation tank 26, which is connected to the sludge tank 27. A silt removal pump 262 is installed on the sewage pipe 261. A mud guide plate 222 is installed inside the aerobic tank 22. The mud guide plate 222 is generally made of steel plate and is tilted downward near the connection port 221. The mud guide plate 222 guides sediment from the aerobic tank 22 into the sedimentation tank 26. By setting up a sedimentation tank 26 outside the aerobic tank 22, the sedimentation tank 26 can effectively collect impurities deposited in the aerobic tank 22, and use the dredging pump 262 to discharge the settled sludge to the sludge tank 27, thereby achieving effective treatment of the sediment in the aerobic tank 22, avoiding long-term accumulation of sludge in the aerobic tank 22 and affecting the biological reaction effect, thereby improving the sewage treatment efficiency and stability of the equipment.

[0031] Reference Figure 2 A water-blocking strip 4 is fixedly installed in the aerobic tank 22 and above the mud guide plate 222. The connection port 221 is arranged below the water-blocking strip 4. The membrane bioreactor 23 and the microporous bubble generator 251 are both arranged above the water-blocking strip 4. Specifically, the water-blocking strip 4 includes a frame 41 and a plurality of baffles 42 arranged in the frame 41. The frame 41 is generally made of aluminum alloy, has a light weight and good corrosion resistance. The baffles 42 are generally made of plastic, the length directions of each baffle 42 are parallel, and the baffles 42 are inclined vertically, and intervals are set between adjacent baffles 42. The setting of the water-blocking strip 4 can block and guide the water flow in the aerobic tank 22, reduce the disturbance of the water body below the water-blocking strip 4, help the precipitation of impurities, and improve the sewage treatment effect.

[0032] Reference Figure 2A partition 263 is provided in the sedimentation tank 26, and the partition 263 is provided above the connection port 221. A plurality of water filter holes are provided on the partition 263, and the diameter of the water filter holes can be adjusted according to actual needs. A filter packing layer 264 is provided above the partition 263, and the filter packing layer 264 can be filled with materials such as quartz sand and gravel. The filter packing layer 264 can filter the sewage flowing from the aerobic tank 22 into the sedimentation tank 26, remove impurities and some suspended matter, and improve the precipitation effect of impurities inside the sedimentation area.

[0033] Reference Figure 2 A nitrification liquid reflux pump 265 is provided in the sedimentation tank 26 and above the reverse filter packing layer 264. A gear pump can be used for the nitrification liquid reflux pump 265, which has the characteristics of stable flow and high pressure. The nitrification liquid reflux pump 265 is connected to a nitrification liquid reflux pipe 266, which is connected to the anoxic tank 21. The nitrification liquid reflux pipe 266 can return the nitrification liquid above the sedimentation area to the anoxic tank 21, thereby promoting the denitrification process and improving the denitrification efficiency by more than 20%. At the same time, the nitrogen cycle in the system is optimized, effectively alleviating the problem of low denitrification efficiency in the traditional MBR system and improving the overall sewage treatment effect.

[0034] Reference Figure 2 A sludge return pump 267 is provided in the sedimentation tank 26 and below the partition 263. The sludge return pump 267 is connected to a sludge return pipe 268, which is connected to the anoxic tank 21. A turbine agitator 211 is provided in the anoxic tank 21. The turbine agitator 211 is generally composed of a motor, turbine blades and other components, and can fully stir the sewage and sludge in the anoxic tank 21. The sludge return pump 267 returns the sludge in the sedimentation tank 26 to the anoxic tank 21, replenishing the number of microorganisms in the anoxic tank 21 and improving the biological treatment effect. The turbine agitator 211 evenly distributes the sludge in the anoxic tank 21, thereby enhancing the effect of the biological reaction.

[0035] Reference Figure 2 The aerobic tank 22 is also equipped with an ammonia nitrogen sensor 223 and a sludge concentration sensor 224. These sensors are electrically connected to a control system, which is in turn electrically connected to the nitrification solution return pump 265 and the sludge return pump 267. The ammonia nitrogen sensor 223 is used to detect the ammonia nitrogen concentration of the water in the aerobic tank 22, while the sludge concentration sensor 224 is used to detect the suspended solids concentration of the mixed liquor in the aerobic tank 22. Based on the ammonia nitrogen concentration and sludge concentration signals fed back by the ammonia nitrogen sensor 223 and the sludge concentration sensor 224, the control system regulates the return ratio of the nitrification solution return pump 265 and the sludge return pump 267, ensuring that the activated sludge concentration in the system remains within a reasonable range, further improving the efficiency of nitrogen and phosphorus removal.

[0036] The implementation principle of a modular integrated sewage treatment equipment in an embodiment of the present application is as follows: the regulating tank 1, MBR module 2 and clear water tank 3 are modularly integrated to greatly reduce the floor space of the equipment. The mixer 13 and the lifting pump 14 perform preliminary regulation and transportation of the sewage to ensure the stability of the sewage entering the MBR module 2. The anoxic tank 21 and the aerobic tank 22 in the MBR module 2 are graded for treatment, combined with the high-efficiency filtration of the membrane bioreactor 23, to improve the efficiency of nitrogen and phosphorus removal. The aeration device 25 not only provides oxygen for the aerobic tank 22, but also prevents membrane pollution of the membrane bioreactor 23. The suction pump 24 transports the treated water to the clear water tank 3. Compared with the traditional decentralized multi-unit combination process, this integrated design avoids the problems of low connection efficiency and large hydraulic loss between modules, improves the efficiency and stability of sewage treatment, and reduces energy consumption.

[0037] The present application also discloses a sewage treatment method of a modular integrated sewage treatment device, comprising the following steps: S1, sewage enters the regulating tank 1, and the water quality and water quantity in the regulating tank 1 are adjusted by the mixer 13 to make the pollutants in the sewage evenly distributed; S2. The sewage in the regulating tank 1 is transported to the anoxic tank 21 through the lifting pump 14 and the sewage delivery pipe 15. In the anoxic tank 21, there are a large number of facultative anaerobic bacteria. In the anoxic environment, these microorganisms use the organic carbon source in the sewage as an electron donor to reduce nitrate and nitrite to nitrogen gas, realizing the denitrification process; S3. The sewage in the anoxic tank 21 then flows through the overflow dam into the aerobic tank 22. In the aerobic tank 22, ammonia nitrogen is oxidized into nitrate by nitrifying bacteria; polyphosphate-accumulating bacteria absorb excessive phosphorus in the water under aerobic conditions to form polyphosphate; and heterotrophic bacteria decompose the remaining organic matter into carbon dioxide and water. S4. The water filtered by the membrane bioreactor 23 is transported to the clean water tank 3 through the outlet pipe 231 by the suction pump 24. During this process, the aeration device 25 supplies oxygen to the aerobic tank 22 and forms bubble disturbance on the membrane surface of the membrane bioreactor 23 to prevent membrane pollution and realize sewage treatment and collection.

[0038] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A modular integrated sewage treatment equipment, characterized by: The invention comprises a regulating tank (1), an MBR module (2) and a clear water tank (3); the regulating tank (1) is provided with a stirrer (13) for regulating water quality and water quantity; the regulating tank (1) is provided with a lifting pump (14), and the lifting pump (14) is connected to a sewage conveying pipe (15); the MBR module (2) comprises an anoxic tank (21), an aerobic tank (22), a membrane bioreactor (23), a suction pump (24) and an aeration device (25); the sewage conveying pipe (15) is connected to the anoxic tank (21), and the anoxic tank (21) is connected to the sewage conveying pipe (15). ) is connected to the aerobic tank (22) through an overflow dam, the membrane bioreactor (23) is installed in the aerobic tank (22), the membrane bioreactor (23) is connected to a water outlet pipe (231), the water outlet pipe (231) is connected to the clean water tank (3), the suction pump (24) is installed on the water outlet pipe (231), the aeration device (25) is used to supply oxygen to the aerobic tank (22), and the aeration device (25) is connected to the membrane bioreactor (23) to form bubble disturbance on the membrane surface of the membrane bioreactor (23).

2. The modular integrated sewage treatment equipment according to claim 1, characterized in that: A water filter trough (11) is fixedly provided on the side wall of the regulating tank (1) module, and a water outlet communicating with the regulating tank (1) is provided on the side wall of the water filter trough (11), wherein a coarse grid (12) is provided at the water outlet.

3. The modular integrated sewage treatment equipment according to claim 1, characterized in that: A sedimentation tank (26) is provided outside the aerobic tank (22), and the aerobic tank (22) is provided with a connection port (221) communicating with the sedimentation tank (26). The bottom of the sedimentation tank (26) is connected to a sewage pipe (261), and the sewage pipe (261) is connected to a sludge tank (27). A silt removal pump (262) is provided on the sewage pipe (261).

4. The modular integrated sewage treatment equipment according to claim 3, characterized in that: A mud guide plate (222) is provided in the aerobic tank (22). The mud guide plate (222) is tilted downward in a direction close to the connection port (221) and is used to guide the sediment in the aerobic tank (22) into the sedimentation tank (26).

5. The modular integrated sewage treatment equipment according to claim 4, characterized in that: A water-blocking strip plate (4) is fixedly arranged in the aerobic pool (22) and above the mud guide plate (222). The water-blocking strip plate (4) comprises a frame (41) and a plurality of baffles (42) arranged in the frame (41). The length directions of the baffles (42) are parallel, and the baffles (42) are inclined vertically, and adjacent baffles (42) are arranged at intervals.

6. The modular integrated sewage treatment equipment according to claim 3, characterized in that: A partition (263) is provided in the sedimentation tank (26), the partition (263) is provided above the connection port (221), a plurality of water filter holes are provided on the partition (263), and a reverse filter packing layer (264) is provided above the partition (263); a nitrification liquid reflux pump (265) is provided in the sedimentation tank (26) and above the reverse filter packing layer (264), the nitrification liquid reflux pump (265) is connected to a nitrification liquid reflux pipe (266), and the nitrification liquid reflux pipe (266) is connected to the anoxic tank (21).

7. The modular integrated sewage treatment equipment according to claim 6, characterized in that: A sludge return pump (267) is provided in the sedimentation tank (26) and below the partition (263). The sludge return pump (267) is connected to a sludge return pipe (268). The sludge return pipe (268) is connected to the anoxic tank (21). A turbine agitator (211) is provided in the anoxic tank (21).

8. The modular integrated sewage treatment equipment according to claim 7, characterized in that: The aerobic tank (22) is further provided with an ammonia nitrogen sensor (223) and a sludge concentration sensor (224). The ammonia nitrogen sensor (223) is used to detect the ammonia nitrogen concentration of the water quality in the aerobic tank (22), and the sludge concentration sensor (224) is used to detect the suspended solids concentration of the mixed liquid in the aerobic tank (22). The ammonia nitrogen sensor (223) and the sludge concentration sensor (224) are electrically connected to a control system. The control system is electrically connected to the nitrification liquid reflux pump (265) and the sludge reflux pump (267) respectively. The control system regulates the reflux ratio of the nitrification liquid reflux pump (265) and the sludge reflux pump (267) based on the ammonia nitrogen concentration and sludge concentration signals fed back by the ammonia nitrogen sensor (223) and the sludge concentration sensor (224).

9. The modular integrated sewage treatment equipment according to claim 1, characterized in that: A backwash pump (31) is provided in the clean water tank (3), and the backwash pump (31) is connected to a backwash pipe (32), and the backwash pipe (32) is connected to the outlet pipe (231), and the connecting end of the backwash pipe (32) and the outlet pipe (231) is located on the side of the suction pump (24) close to the membrane bioprocessor.

10. A sewage treatment method based on the modular integrated sewage treatment equipment according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, sewage enters the regulating tank (1), and the water quality and water quantity in the regulating tank (1) are adjusted by the mixer (13) so that the pollutants in the sewage are evenly distributed; S2, the sewage in the regulating tank (1) is transported to the anoxic tank (21) through the lifting pump (14) and the sewage conveying pipe (15). In the anoxic tank (21), there are a large number of facultative anaerobic bacteria. Under the anoxic environment, these microorganisms use the organic carbon source in the sewage as an electron donor to reduce nitrate and nitrite to nitrogen gas, thereby realizing the denitrification process; S3. The sewage in the anoxic tank (21) then flows through the overflow dam into the aerobic tank (22). In the aerobic tank (22), ammonia nitrogen is oxidized into nitrate by nitrifying bacteria; polyphosphate bacteria absorb excessive phosphorus in the water under aerobic conditions to form polyphosphate; and heterotrophic bacteria decompose the remaining organic matter into carbon dioxide and water; S4. The water filtered by the membrane bioreactor (23) is transported to the clean water tank (3) through the outlet pipe (231) by the suction pump (24). During this process, the aeration device (25) supplies oxygen to the aerobic tank (22) and forms bubble disturbance on the membrane surface of the membrane bioreactor (23) to prevent membrane contamination and realize sewage treatment and collection.

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