MABR-based low-energy-consumption and low-carbon-nitrogen-ratio sewage treatment device

Abstract

The utility model discloses a low-energy-consumption and low-carbon-nitrogen-ratio sewage treatment device based on an MABR, and relates to the technical field of sewage treatment devices, in particular to the low-energy-consumption and low-carbon-nitrogen-ratio sewage treatment device based on the MABR, which is arranged on a foundation ground with a certain gradient. Comprising an anaerobic tank, an MABR membrane tank, an aerobic tank, a sedimentation tank and a disinfection tank which are formed by pouring building components, the oxygen transfer efficiency is improved through the MABR membrane assembly in the MABR membrane tank, the improvement of the oxygen transfer efficiency can effectively reduce the energy consumption, simultaneous nitrification and denitrification is realized, and ammonia nitrogen and total nitrogen in water are effectively removed; the aerobic tank is aerated through the aeration assembly, dissolved oxygen in water is increased, and metabolism of aerobic microorganisms is promoted, so that decomposition of organic matters is accelerated, and the nitrification effect is enhanced. According to the technical scheme, the MABR process and other sewage treatment processes are effectively combined, the sewage treatment effects of low energy consumption and low carbon nitrogen ratio are achieved, and compared with the prior art, the overall structure is simple, and the sewage treatment process is simple, convenient and efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment devices, in particular to a low-energy consumption, low-carbon-nitrogen ratio sewage treatment device based on MABR. Background Art

[0002] When industrial and domestic wastewater is directly discharged into rivers or lakes without proper treatment, the total amount of pollutants exceeds the water's self-purification capacity, causing hypoxia and eutrophication, which in turn creates black and odorous water bodies. Currently, various methods exist to treat black and odorous rivers, such as dredging and water exchange, and biological purification. However, these wastewater treatment systems are often difficult to implement due to their high cost, large engineering workload, and slow effectiveness.

[0003] The MABR process has attracted the attention of the water treatment industry in the past few years. Its full name is Membrane Aerated Biofilm Reactor (MABR), which is an advanced aerobic biological treatment process with low energy consumption. Due to the characteristics of the MABR membrane, the effect of water depth resistance on the aeration process is negligible, so there is no need to pressurize the air, which significantly reduces energy consumption compared to traditional aeration processes. Constant low-pressure air enters the membrane assembly through the gap between the breathable membrane and the spacer layer, and then distributes oxygen into the water. This structure can achieve optimal oxygen mass transfer efficiency, and oxygen diffuses from one side of the membrane to the wastewater on the other side through a free diffusion mechanism. The biofilm layer on the membrane surface can achieve simultaneous nitrification and denitrification, and has a very high level of pollutant removal compared to traditional biofilm methods.

[0004] Therefore, how to rationally integrate the MABR process with other wastewater treatment processes is a technical problem that urgently needs to be solved by those skilled in the art. In a published Chinese patent application, Publication Number: CN109650656B, Patent Title: A Wastewater Treatment Process, while this prior art rationally combines a multi-stage A / O process with a MABR process to achieve effective wastewater treatment, its implementation is relatively complex, resulting in a cumbersome wastewater treatment process. Utility Model Content

[0005] (1) Technical problems solved

[0006] In view of the shortcomings of the existing technology, the utility model provides a low-energy consumption, low-carbon-nitrogen ratio sewage treatment device based on MABR, which solves the problems raised in the above background technology.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a low-energy consumption, low-carbon-nitrogen ratio sewage treatment device based on MABR, which is arranged on a foundation ground with a certain slope, and includes an anaerobic tank, a MABR membrane tank, an aerobic tank, a sedimentation tank, and a disinfection tank cast by using building components, the anaerobic tank, the MABR membrane tank, the aerobic tank, the sedimentation tank, and the disinfection tank are connected in sequence, and the lowest water levels in the anaerobic tank, the MABR membrane tank, the aerobic tank, the sedimentation tank, and the disinfection tank are arranged from high to low; at least one MABR membrane module is installed in the MABR membrane tank, at least one aeration module is fixedly installed in the aerobic tank, and an inclined tube row is fixedly installed in the sedimentation tank, and the inner bottom wall of the sedimentation tank is conical; a low-energy consumption, low-carbon-nitrogen ratio sewage treatment device based on MABR also includes an air source component and a mud discharge component, the gas outflow end of the air source component is respectively connected to the gas inflow end of the MABR membrane module and the aeration component; the mud discharge component includes a mud discharge pump, and the mud inflow end of the mud discharge pump is respectively connected to the inner bottom of the anaerobic tank and the sedimentation tank.

[0009] Optionally, submersible flow propellers are fixedly installed on the inner walls of the anaerobic tank and the MABR membrane tank, respectively, with the flow-propulsion end of the submersible flow propeller facing the medium outflow port on the tank body; and a water inlet pipe is provided on the anaerobic tank.

[0010] Optionally, the aeration assembly includes a spiral aeration coil, which is fixedly mounted on the inner bottom wall of the aerobic tank. Multiple nozzles are distributed and fixedly mounted on the outer wall of the aeration coil, and multiple one-way valves are provided on the aeration coil.

[0011] Optionally, the air source assembly includes an aeration fan, a main pipeline, an air scrubbing pipe, and an aeration pipe. The gas outflow end of the aeration fan is connected to the gas inflow end of the aeration coil through the main pipeline and the aeration pipe in sequence; the aeration fan is connected to a gas inflow end of the MABR membrane assembly through the main pipeline and the air scrubbing pipe in sequence.

[0012] Optionally, the inclined tube row includes a U-shaped metal frame welded with steel pipes, and a plurality of transversely arranged metal pipes are welded on the metal frame. The tube body of each metal pipe is tilted downward, and a gap is formed between two adjacent metal pipes; the inclined tube row is fixedly installed on the middle inner wall of the sedimentation tank.

[0013] Optionally, the sludge discharge assembly also includes a first sludge pipe, a second sludge pipe, and a residual sludge pipe, one end of the first sludge pipe is fixedly installed on the bottom of the anaerobic tank and the two are connected, the other end of the first sludge pipe is fixedly installed on the medium inlet end of the sludge pump and the two are connected; one end of the second sludge pipe is fixedly installed on the bottom of the sedimentation tank and the two are connected, the other end of the second sludge pipe is also fixedly installed on the medium inlet end of the sludge pump and the two are connected; one end of the residual sludge pipe is connected to one end of the first sludge pipe close to the sludge pump.

[0014] (3) Beneficial effects

[0015] The utility model provides a low energy consumption and low carbon-nitrogen ratio sewage treatment device based on MABR, which has the following beneficial effects:

[0016] The MABR-based sewage treatment device with low energy consumption and low carbon-nitrogen ratio hydrolyzes organic matter in sewage through an anaerobic tank, decomposes macromolecular organic matter into small molecular organic matter, and stirs sewage through a submerged flow propeller in the anaerobic tank to strengthen sewage flow. The MABR membrane assembly in the MABR membrane tank improves oxygen transfer efficiency, which can effectively reduce energy consumption, achieve simultaneous nitrification and denitrification, and effectively remove ammonia nitrogen and total nitrogen in the water. The aeration assembly aerates the aerobic tank to increase dissolved oxygen in the water, promotes the metabolism of aerobic microorganisms, thereby accelerating the decomposition of organic matter and strengthening nitrification. The aerated sewage is precipitated in a sedimentation tank, and the sludge is diverted and filtered through an inclined pipe row to settle the sludge. The sewage is disinfected in a disinfection tank. The sludge in the anaerobic tank and the sedimentation tank is discharged through a sludge discharge assembly. This technical solution effectively combines the MABR process with other sewage treatment processes to achieve sewage treatment effects with low energy consumption and low carbon-nitrogen ratio. Compared with existing technologies, the overall structure is simple and the sewage treatment process is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the pipeline structure of a low-energy consumption, low-carbon-nitrogen ratio sewage treatment device based on MABR in the utility model.

[0019] In the figure: 1. Anaerobic tank; 2. MABR membrane tank; 3. Aerobic tank; 4. Sedimentation tank; 5. Disinfection tank; 6. Water inlet pipe; 7. Submersible flow thruster; 8. MABR membrane assembly; 9. Manual condensate drain valve; 10. Condensate drain pipe; 11. Manual exhaust valve; 12. Outlet pipe; 13. Aeration assembly; 14. Inclined tube row; 15. Process fan; 16. Aeration fan; 17. Inlet pipe; 18. Manual air inlet valve; 19. Main pipeline; 20. Manual membrane scrubbing valve; 21. Electric air scrubbing valve; 22. Electric air scrubbing pipe; 23. Manual aeration valve; 24. Aeration pipeline; 25. Mud discharge pump; 26. Manual sludge return valve; 27. First sludge pipe; 28. Manual valve for residual sludge; 29. ​​Residual sludge pipe; 30. Electric valve for residual sludge; 31. Water outlet pipe. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indications or implications.

[0021] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances. Obviously, the embodiments described are only some of the embodiments of this utility model, and not all of them.

[0022] See also Figure 1 The utility model provides a technical solution: a low-energy consumption, low-carbon-nitrogen ratio sewage treatment device based on MABR, which is arranged on a foundation ground with a certain slope, and includes an anaerobic tank 1, a MABR membrane tank 2, an aerobic tank 3, a sedimentation tank 4, and a disinfection tank 5 cast with building components. The anaerobic tank 1, the MABR membrane tank 2, the aerobic tank 3, the sedimentation tank 4, and the disinfection tank 5 are connected in sequence, and the lowest water levels in the anaerobic tank 1, the MABR membrane tank 2, the aerobic tank 3, the sedimentation tank 4, and the disinfection tank 5 are arranged from high to low.

[0023] Among them, there is a height difference between the anaerobic tank 1, the MABR membrane tank 2, the aerobic tank 3, the sedimentation tank 4, and the disinfection tank 5, and the sewage flows through the anaerobic tank 1, the MABR membrane tank 2, the aerobic tank 3, the sedimentation tank 4, and the disinfection tank 5 in sequence.

[0024] At least one MABR membrane assembly 8 is installed in the MABR membrane tank 2. At least one aeration assembly 13 is fixedly installed in the aerobic tank 3. An inclined tube array 14 is fixedly installed in the sedimentation tank 4. The inner bottom wall of the sedimentation tank 4 is tapered. The MABR membrane assembly 8 can be purchased commercially or the MABR membrane assembly disclosed in Chinese Patent Application Publication No. CN109650656A can be used.

[0025] A low-energy, low-carbon-nitrogen ratio sewage treatment device based on MABR also includes an air source assembly and a sludge discharge assembly. The gas outflow end of the air source assembly is connected to the gas inflow end of the MABR membrane assembly 8 and the aeration assembly 13, respectively. The sludge discharge assembly includes a sludge discharge pump 25, and the sludge inflow end of the sludge discharge pump 25 is connected to the inner bottom of the anaerobic tank 1 and the sedimentation tank 4, respectively.

[0026] Among them, the organic matter in the sewage is hydrolyzed by the anaerobic tank 1, and the large molecular organic matter is decomposed into small molecular organic matter. The oxygen transfer efficiency is improved by the MABR membrane assembly 8 in the MABR membrane tank 2. The improvement of the oxygen transfer efficiency can effectively reduce energy consumption, realize the simultaneous nitrification and denitrification, and effectively remove ammonia nitrogen and total nitrogen in the water. The aeration component 13 is used to aerate the aerobic tank 3 to increase the dissolved oxygen in the water, promote the metabolism of aerobic microorganisms, thereby accelerating the decomposition of organic matter and strengthening nitrification. The aerated sewage is precipitated by the sedimentation tank 4, and the sludge is diverted and filtered through the inclined pipe discharge 14 to allow the sludge to settle. The sewage is disinfected by the disinfection tank 5. The sludge in the anaerobic tank 1 and the sedimentation tank 4 is discharged by the sludge discharge component.

[0027] Specifically, a submersible flow propeller 7 is fixedly installed on the inner wall of each of the anaerobic tank 1 and the MABR membrane tank 2, with the flow-propulsion end of the submersible flow propeller 7 facing the medium outflow port on the tank body (referring to the tank body of the anaerobic tank 1 and the MABR membrane tank 2). A water inlet pipe 6 is provided on the anaerobic tank 1.

[0028] The sewage is stirred and its flow is enhanced by the submerged flow impeller 7 in the anaerobic tank 1. The water inlet pipe 6 is used to transport the incoming sewage into the anaerobic tank 1. The submerged flow impeller 7 plays a stirring role during the flow impeller process, and the blades of the submerged flow impeller 7 stir the sewage.

[0029] Specifically, the aeration assembly 13 includes a spiral aeration coil, which is fixedly mounted on the inner bottom wall of the aerobic tank 3 . A plurality of nozzles are distributed and fixedly mounted on the outer wall of the aeration coil, and a plurality of one-way valves are provided on the aeration coil.

[0030] The aeration assembly 13 is used to aerate the wastewater within the aerobic tank 3. After being transported into the aeration coil, the oxygen-containing gas is ejected through the nozzles on the aeration coil, diffusing the oxygen-containing gas into the water, thereby aerating the water. A one-way valve on the aeration coil prevents the oxygen-containing gas from flowing backward and prevents water from entering the aeration coil.

[0031] More specifically, the air source assembly includes an aeration fan 16, a main pipeline 19, an air scrubber pipe 22, and an aeration pipe 24. The air outlet of the aeration fan 16 is connected to the air inlet of the aeration coil via the main pipeline 19 and the aeration pipe 24. The aeration fan 16 is connected to one air inlet of the MABR membrane module 8 via the main pipeline 19 and the air scrubber pipe 22.

[0032] Among them, an aeration manual valve 23 is installed on the aeration pipe 24. The oxygen-containing gas produced by the aeration fan 16 flows into the aeration coil through the main pipe 19 and the aeration pipe 24. The membrane scrubbing manual valve 20 and the air scrubbing electric valve 21 are respectively installed on the air scrubbing pipe 22. MABR scrubbing is achieved by controlling the opening and closing of the air scrubbing electric valve 21. When the air scrubbing electric valve 21 is closed, the air volume of the aeration fan 16 is all used for aeration and oxygen supply of the aerobic tank 3; when the air scrubbing electric valve 21 is opened, most of the air volume of the aeration fan 16 enters the backwash pipe in the MABR membrane assembly 8 to scrub the MABR membrane. The opening interval of the air scrubbing electric valve 21 is 8 hours, and each time lasts for 1 minute.

[0033] The MABR membrane assembly 8 is equipped with a condensate drain pipe 10, an outlet pipe 12, and an inlet pipe 17. The condensate drain pipe 10 is equipped with a manual condensate drain valve 9, the outlet pipe 12 is equipped with a manual exhaust valve 11, and the inlet pipe 17 is equipped with a manual inlet valve 18. One end of the inlet pipe 17 is fixedly mounted to and connected to the MABR membrane assembly 8, while the other end of the inlet pipe 17 is fixedly mounted to and connected to the process fan 15. The air pressure of the process fan 15 is 10 kPa, which can be controlled by adjusting the opening of the manual exhaust valve 11. The dissolved oxygen control values ​​for each reaction tank are as follows: anaerobic tank 1 is below 0.3 mg / L, MABR membrane tank 2 is below 0.5 mf / L, and aerobic tank 3 is between 1.5 and 2 mg / L. The sludge concentration is controlled between 3000 and 4000 mg / L, with 100% sludge recirculation.

[0034] Specifically, the inclined tube array 14 comprises a U-shaped metal frame welded from steel pipes, onto which are welded a plurality of transversely arranged metal tubes. Each tube body is tilted downward, with gaps formed between adjacent tubes. The inclined tube array 14 is fixedly mounted on the central inner wall of the sedimentation tank 4.

[0035] The aerated sewage is precipitated in the sedimentation tank 4, and the sludge is filtered and guided through the inclined pipe row 14 to settle the sludge. The filtered seepage water flows to the disinfection tank 5. After settling, the sludge gathers at the bottom of the sedimentation tank 4.

[0036] Specifically, the sludge discharge assembly also includes a first sludge pipe 27, a second sludge pipe, and a residual sludge pipe 29. One end of the first sludge pipe 27 is fixedly mounted to and connected to the bottom of the anaerobic tank 1, and the other end of the first sludge pipe 27 is fixedly mounted to and connected to the medium inlet end of the sludge pump 25. One end of the second sludge pipe is fixedly mounted to and connected to the bottom of the sedimentation tank 4, and the other end of the second sludge pipe is also fixedly mounted to and connected to the medium inlet end of the sludge pump 25. One end of the residual sludge pipe 29 is connected to the end of the first sludge pipe 27 near the sludge pump 25.

[0037] The sludge discharge assembly is used to discharge sludge from the anaerobic tank 1 and the sedimentation tank 4. The sludge discharge pump 25 draws sludge from the bottom of the anaerobic tank 1 through the first sludge pipe 27, thereby discharging the sludge from the anaerobic tank 1. The sludge discharge pump 25 draws sludge from the bottom of the sedimentation tank 4 through the second sludge pipe, thereby discharging the sludge from the sedimentation tank 4. The first sludge pipe 27 is provided with a manual sludge return valve 26, which is used to control the opening of the first sludge pipe 27. The residual sludge pipe 29 is provided with a manual residual sludge valve 28 and an electric residual sludge valve 30. When the sludge discharge pump 25 cannot effectively remove the residual sludge, the residual sludge pipe 29 is used to discharge the residual sludge.

[0038] A water outlet pipe 31 communicating with the interior of the disinfection pool 5 is fixedly mounted on the disinfection pool 5 . The water outlet pipe 31 is used to discharge the water in the disinfection pool 5 .

[0039] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low energy consumption, low carbon-nitrogen ratio sewage treatment device based on MABR, characterized by: The invention is arranged on a foundation ground with a certain slope, and comprises an anaerobic tank (1), a MABR membrane tank (2), an aerobic tank (3), a sedimentation tank (4), and a disinfection tank (5) which are cast by using building components. The anaerobic tank (1), the MABR membrane tank (2), the aerobic tank (3), the sedimentation tank (4), and the disinfection tank (5) are connected in sequence, and the lowest water levels in the anaerobic tank (1), the MABR membrane tank (2), the aerobic tank (3), the sedimentation tank (4), and the disinfection tank (5) are arranged in descending order. At least one MABR membrane assembly (8) is installed in the MABR membrane tank (2), at least one aeration assembly (13) is fixedly installed in the aerobic tank (3), an inclined tube row (14) is fixedly installed in the sedimentation tank (4), and the inner bottom wall of the sedimentation tank (4) is tapered; The invention also includes an air source component and a mud discharge component. The gas outflow end of the air source component is respectively connected to the gas inflow end of the MABR membrane component (8) and the aeration component (13); the mud discharge component includes a mud discharge pump (25). The mud inflow end of the mud discharge pump (25) is respectively connected to the inner bottom of the anaerobic tank (1) and the sedimentation tank (4).

2. A low-energy consumption, low-carbon-nitrogen ratio sewage treatment device based on MABR according to claim 1, characterized in that: Submersible flow propellants (7) are fixedly installed on the inner side walls of the anaerobic tank (1) and the MABR membrane tank (2), respectively, and the flow-propelling end of the submersible flow propellant (7) faces the medium outflow port on the tank body; and a water inlet pipe (6) is provided on the anaerobic tank (1).

3. A low-energy consumption, low-carbon-nitrogen ratio sewage treatment device based on MABR according to claim 1, characterized in that: The aeration assembly (13) comprises a spiral aeration coil, which is fixedly mounted on the inner bottom wall of the aerobic tank (3). A plurality of nozzles are fixedly mounted on the outer side wall of the aeration coil in a distributed manner, and a plurality of one-way valves are provided on the aeration coil.

4. A low energy consumption, low carbon-nitrogen ratio sewage treatment device based on MABR according to claim 3, characterized in that: The air source component comprises an aeration fan (16), a main pipeline (19), an air scrubbing pipe (22), and an aeration pipe (24); the gas outflow end of the aeration fan (16) is sequentially connected to the gas inflow end of the aeration coil through the main pipeline (19) and the aeration pipe (24); and the aeration fan (16) is sequentially connected to a gas inflow end of the MABR membrane assembly through the main pipeline (19) and the air scrubbing pipe (22).

5. A low energy consumption, low carbon-nitrogen ratio sewage treatment device based on MABR according to claim 1, characterized in that: The inclined tube row (14) comprises a square-shaped metal frame welded with steel tubes, on which a plurality of transversely arranged metal tubes are welded, with the tube bodies of the respective metal tubes tilted downward, and a gap is formed between two adjacent metal tubes; the inclined tube row (14) is fixedly mounted on the inner side wall of the middle portion of the sedimentation tank (4).

6. A low energy consumption, low carbon-nitrogen ratio sewage treatment device based on MABR according to claim 1, characterized in that: The sludge discharge assembly further comprises a first sludge pipe (27), a second sludge pipe, and a residual sludge pipe (29). One end of the first sludge pipe (27) is fixedly mounted on the bottom of the anaerobic tank (1) and the two are in communication. The other end of the first sludge pipe (27) is fixedly mounted on the medium inflow end of the sludge discharge pump (25) and the two are in communication. One end of the second sludge pipe is fixedly mounted on the bottom of the sedimentation tank (4) and the two are in communication. The other end of the second sludge pipe is also fixedly mounted on the medium inflow end of the sludge discharge pump (25) and the two are in communication. One end of the residual sludge pipe (29) is in communication with one end of the first sludge pipe (27) close to the sludge discharge pump (25).

Images