Gas stripping type MBR (Membrane Bioreactor) integrated sewage treatment device

Abstract

The utility model discloses a gas stripping type MBR (Membrane Biological Reactor) integrated sewage treatment device, and aims to solve the problems that the reflux quantity of a treatment section cannot be effectively controlled and the treatment effect is influenced due to the fact that an aeration system and a gas stripping device share one fan in the conventional integrated sewage treatment equipment adopting the gas stripping device. The device comprises an anoxic tank, an aerobic tank, a membrane tank, a clean water tank, an aeration gas stripping unit, a control system and the like, the aeration gas stripping unit comprises a first fan, a fan gas outlet header pipe, a sludge backflow assembly and a mixed liquid backflow assembly; the sludge backflow assembly comprises a sludge backflow gas inlet pipe, a sludge backflow gas stripping device, a sludge backflow buffer tank, a sludge backflow liquid rising pipe, a sludge backflow water outlet pipe and a sludge backflow adjusting valve; and the sludge backflow buffer tank is of an open structure with an open upper end. Based on the arrangement of the overflow structure, the distribution control difficulty of the aeration rate of the fan can be effectively reduced, and effective control on the reflux quantity can be realized.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, specifically to an airlift MBR integrated sewage treatment device. More specifically, the application relates to an improved airlift MBR integrated sewage treatment device, which has a more optimized structure and more stable and reliable operation. Background Art

[0002] Since the beginning of this century, with the rapid development of urbanization and industrialization in my country, the demand gap for water resources has been increasing. Against this background, the development of integrated sewage equipment has been getting faster and faster, and its application scope has become increasingly wide. In recent years, with the rural revitalization and the improvement of the living environment, the demand for the treatment of rural domestic sewage has also increased. Rural domestic sewage has the characteristics of a wide range of sources and high dispersion. Integrated sewage treatment equipment is expected to play an increasingly important role in the treatment of rural domestic sewage.

[0003] The sewage treatment method of integrated sewage treatment equipment is usually based on biochemical method, including activated sludge method and biofilm method. The treatment process is as follows: after the sewage is pre-treated by the screen, it enters the regulating tank for temporary storage, and then enters the anoxic tank through the submersible sewage pump, and is treated in the anoxic tank and aerobic tank in turn. The treated clean water is then discharged after ultraviolet disinfection.

[0004] Membrane bioreactor (MBR) is a water treatment method that combines membrane separation technology with activated sludge process, which can achieve stable and efficient treatment effects. In recent years, with the improvement of water treatment standards, MBR has been more and more widely used. At the same time, the MBR treatment method has the advantage of occupying less space, making MBR widely used in integrated sewage treatment devices.

[0005] When the MBR integrated sewage treatment equipment is in operation, it is necessary to reflux the mixed liquid and sludge in the aerobic tank and the membrane tank respectively, and the reflux is usually powered by a reflux pump. In this structure, the selection of two reflux pumps will have a great impact on the pipeline layout and equipment layout of the integrated sewage treatment device, and will also increase the footprint of the integrated device. After improvement, an air lift device is used for the reflux of the mixed liquid and sludge. The principle of the reflux of the mixed liquid and sludge by the air lift device is as follows: after the gas is mixed with sewage and sludge through the compressed air pipe, the density of the mixed liquid formed is lower than the density of the original liquid. The density difference causes the liquid level height of the liquid inside and outside the riser to change, and the mixed liquid with low density rises and is discharged with the riser. With this structure, the air lift device, aerobic tank and membrane component aeration system use a common fan.

[0006] In the integrated sewage treatment equipment using the air lift device, since the aeration system and the air lift device share a fan and the aeration volume is only distributed through pipelines, the actual air volume of the air lift device is difficult to control within a specific range. This results in the inability to effectively control the return volume of the treatment section, resulting in problems such as excessive return volume and insufficient return volume. This not only wastes energy, but also has a certain impact on the treatment effect of the integrated device.

[0007] For this reason, a new device is urgently needed to solve the above problems. Utility Model Content

[0008] The utility model aims to provide an airlift MBR integrated sewage treatment device to solve the problem that the existing integrated sewage treatment equipment using an airlift device shares a fan with the aeration system and the airlift device, and the aeration volume is only distributed through pipelines, so that the actual air volume of the airlift device is difficult to control within a specific range, which results in the inability to effectively control the reflux volume of the treatment section, thus affecting the treatment effect.

[0009] In order to achieve the above purpose, this application adopts the following technical solutions:

[0010] An airlift MBR integrated sewage treatment device, comprising an anoxic tank, an aerobic tank, a membrane tank, a clear water tank, an aeration airlift unit, and a control system, wherein a membrane module is arranged in the membrane tank;

[0011] The aeration and air stripping unit includes a first fan connected to a control system, a fan air outlet main pipe, a sludge return component, and a mixed liquid return component;

[0012] The sludge return assembly comprises a sludge return air inlet pipe, a sludge return air lift device, a sludge return buffer tank, a sludge return liquid lift pipe, a sludge return water outlet pipe, and a sludge return regulating valve. The sludge return buffer tank is an open structure with an opening at the upper end.

[0013] The air outlet of the first fan is connected to the fan outlet main pipe and the first fan can output air to the fan outlet main pipe, the sludge reflux air stripping device is located at the bottom of the membrane tank, the fan outlet main pipe, the sludge reflux air inlet pipe, and the air inlet of the sludge reflux air stripping device are connected in sequence, and the air in the fan outlet main pipe can enter the sludge reflux air stripping device through the sludge reflux air inlet pipe;

[0014] The sludge return buffer tank is located above the membrane tank and the membrane tank can provide support for the sludge return buffer tank; the inlet of the sludge return lift pipe is connected to the sludge return air stripping device, the sludge return lift pipe passes through the sludge return buffer tank, the outlet end of the sludge return lift pipe is located in the sludge return buffer tank, and the sludge in the membrane tank can enter the sludge return buffer tank through the sludge return air stripping device and the sludge return lift pipe in sequence;

[0015] A second buffer tank overflow port is provided on the side wall of the sludge return buffer tank, and the sludge in the sludge return buffer tank can return to the membrane tank through the second buffer tank overflow port;

[0016] The inlet of the sludge return outlet pipe is connected to the sludge return buffer tank, the outlet end of the sludge return outlet pipe is located in the aerobic tank, and the sludge in the sludge return buffer tank can be sent into the aerobic tank through the sludge return outlet pipe; the sludge return regulating valve is arranged on the sludge return outlet pipe;

[0017] The mixed liquid reflux assembly comprises a mixed liquid reflux air inlet pipe, a mixed liquid reflux air stripping device, a mixed liquid reflux buffer tank, a mixed liquid reflux liquid riser, a mixed liquid reflux water outlet pipe, and a mixed liquid reflux regulating valve. The mixed liquid reflux buffer tank is an open structure with an upper end opening;

[0018] The mixed liquid reflux stripping device is located at the bottom of the aerobic tank, the fan outlet main pipe, the mixed liquid reflux air inlet pipe, and the air inlet of the mixed liquid reflux stripping device are connected in sequence, and the air in the fan outlet main pipe can enter the mixed liquid reflux air stripping device through the mixed liquid reflux air inlet pipe;

[0019] The mixed liquid reflux buffer tank is located above the aerobic tank and the aerobic tank can provide support for the mixed liquid reflux buffer tank; the inlet of the mixed liquid reflux lift pipe is connected to the mixed liquid reflux gas stripping device, the mixed liquid reflux lift pipe passes through the mixed liquid reflux buffer tank, the outlet end of the mixed liquid reflux lift pipe is located in the mixed liquid reflux buffer tank, and the sewage in the aerobic tank can be mixed with air through the mixed liquid reflux gas stripping device to obtain a mixed liquid and sent to the mixed liquid reflux buffer tank through the mixed liquid reflux lift pipe;

[0020] A third buffer tank overflow port is provided on the side wall of the mixed liquid reflux buffer tank, and the mixed liquid in the mixed liquid reflux buffer tank can return to the aerobic tank through the third buffer tank overflow port;

[0021] The inlet of the mixed liquid reflux outlet pipe is connected to the mixed liquid reflux buffer tank, the outlet end of the mixed liquid reflux outlet pipe is located in the anoxic tank, and the mixed liquid in the mixed liquid reflux buffer tank can be sent into the anoxic tank through the mixed liquid reflux outlet pipe; the mixed liquid reflux regulating valve is arranged on the mixed liquid reflux outlet pipe.

[0022] It also includes a second top cover, which is located at the outlet end of the sludge return riser and can prevent the sludge in the sludge return riser from flowing out of the membrane pool due to excessive sludge flow rate.

[0023] It also includes a third top cover, which is located at the outlet end of the mixed liquid reflux riser pipe and can prevent the mixed liquid in the mixed liquid reflux riser pipe from flowing out of the aerobic tank due to excessive flow rate.

[0024] It also includes a sixth regulating valve, which is arranged on the fan air outlet main pipe.

[0025] The sixth regulating valve is a manual ball valve; or the sixth regulating valve is a solenoid valve, and the sixth regulating valve is connected to a control system.

[0026] The sludge return regulating valve and the mixed liquor return regulating valve are solenoid valves respectively, and the sludge return regulating valve and the mixed liquor return regulating valve are respectively connected to the control system.

[0027] It also includes a water outlet trough, a water outlet weir plate, and a water outlet pipe. The water outlet trough is arranged in the aerobic pool. The water outlet weir plate is arranged on the inner side of the water outlet trough and the sewage in the aerobic pool can enter the water outlet trough through the water outlet weir plate. The water outlet trough is connected to the membrane pool through the water outlet pipe and the sewage in the water outlet trough enters the membrane pool through the water outlet pipe. The water outlet end of the water outlet pipe is located below the membrane assembly.

[0028] It also includes a first aeration pipe arranged in the membrane tank, a second aeration pipe arranged in the aerobic tank, and a third aeration pipe arranged in the anoxic tank;

[0029] The air inlet end of the first aeration pipe is connected to the fan air outlet main pipe, and the outlet end of the first aeration pipe is located at the bottom end of the membrane tank;

[0030] The air inlet end of the second aeration pipe is connected to the fan air outlet main pipe, and the air outlet end of the second aeration pipe is located at the bottom end of the aerobic tank;

[0031] The air inlet end of the third aeration pipe is connected to the main air outlet pipe of the fan, and the air outlet end of the third aeration pipe is located at the bottom end of the anoxic tank.

[0032] It also includes a self-priming water inlet pipe, a self-priming pump connected to a control system, and a self-priming water outlet pipe, wherein the self-priming water inlet pipe, the self-priming pump, and the self-priming water outlet pipe are connected in sequence, the self-priming water inlet pipe is located outside the membrane assembly, and the clean water in the membrane pool can be sequentially delivered to the clean water tank through the self-priming water inlet pipe, the self-priming pump, and the self-priming water outlet pipe.

[0033] It also includes an equipment room, in which the first fan and the self-priming pump are respectively arranged.

[0034] In view of the above problems, the present application provides an airlift MBR integrated sewage treatment device, which includes an anoxic tank, an aerobic tank, a membrane tank, a clean water tank, an equipment room, and an aeration airlift unit. The aeration airlift unit includes a first fan, a fan air outlet main pipe, a sludge return component, and a mixed liquid return component; the sludge return component and the mixed liquid return component can be used for the return of sludge and mixed liquid respectively, and a first fan is common to the aeration equipment; at the same time, a sludge return buffer tank and a mixed liquid return buffer tank are provided to temporarily store the return sludge and return mixed liquid respectively. A membrane assembly is provided in the membrane tank, and the first fan and the self-priming pump are respectively provided in the equipment room.

[0035] In this structure, the bottom end of the sludge return buffer tank is connected to the sludge return riser pipe, and the side of the sludge return buffer tank is connected to the sludge return outlet pipe; the bottom end of the mixed liquor return buffer tank is connected to the mixed liquor return riser pipe, and the side of the mixed liquor return buffer tank is connected to the mixed liquor return outlet pipe; a sludge return regulating valve is provided on the sludge return outlet pipe, and a mixed liquor return regulating valve is provided on the mixed liquor return outlet pipe. The sludge return regulating valve and the mixed liquor return regulating valve respectively use electric valves to control the return amount. A second buffer tank overflow port is provided on the side wall of the sludge return buffer tank, so that when the gas returns too much sludge, it overflows back into the membrane tank; a third buffer tank overflow port is provided on the side wall of the mixed liquor return buffer tank, so that when the gas returns too much mixed liquor, it overflows back into the aerobic tank. When in use, the DO, COD and other data in the anoxic tank and the aerobic tank can be measured respectively, and the sludge return regulating valve and the mixed liquor return regulating valve can be adjusted to make the return volume more accurate, further ensure the sewage treatment effect of the device, and make the device more efficient and energy-saving as a whole. The setting of the overflow port of the second buffer tank and the overflow port of the third buffer tank can ensure the release of air, and when the sludge flow returned by the sludge return riser pipe is too much, and the return mixed liquor flow returned by the mixed liquor return riser pipe is too much, and the corresponding sludge return outlet pipe and mixed liquor return outlet pipe are too late to be discharged, they will be returned to the aerobic tank and the anoxic tank accordingly.

[0036] The sewage treatment device of the present application can effectively control the reflux of the gas lift device, improve the treatment effect of the integrated device, and treat sewage more stably, efficiently, and energy-saving. Furthermore, the valve of the present application can adopt an electric valve, so that the system can be controlled online without the need for personnel on duty, which is convenient to operate and has significant effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the return pipeline layout of the airlift MBR integrated sewage treatment device in Example 1.

[0038] Figure 2 This is a schematic diagram of the air intake pipeline layout of the airlift MBR integrated sewage treatment device in Example 1.

[0039] Figure 3 This is a top view of the layout of the airlift MBR integrated sewage treatment device in Example 1.

[0040] Figure 4 This is a side view of the sludge return buffer tank.

[0041] Markings in the figure: 1. sludge reflux air stripping device, 2. sludge reflux rising pipe, 3. sludge reflux buffer tank, 4. second top cover, 5. sludge reflux outlet pipe, 6. sludge reflux regulating valve, 7. membrane assembly, 8. mixed liquor reflux air stripping device, 9. mixed liquor reflux rising pipe, 10. outlet tank, 11. mixed liquor reflux buffer tank, 12. third top cover, 13. mixed liquor reflux outlet pipe, 14. mixed liquor reflux regulating valve, 15. first fan, 16. first regulating valve, 17. sludge reflux air inlet pipe, 18. mixed liquor reflux air inlet pipe, 19. fan air outlet main pipe, 20. overflow port of the second buffer tank. DETAILED DESCRIPTION

[0042] The utility model is described in detail below in conjunction with the accompanying drawings.

[0043] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0044] Example 1

[0045] The present embodiment provides an airlift MBR integrated sewage treatment device, which includes an anoxic tank, an aerobic tank, a membrane tank, a clean water tank, an aeration airlift unit, a control system, and an equipment room, wherein a membrane module is arranged in the membrane tank.

[0046] In this embodiment, the aeration stripping unit includes a first fan connected to the control system, a fan outlet main pipe, a sludge reflux component, and a mixed liquor reflux component. Among them, the sludge reflux component includes a sludge reflux air inlet pipe, a sludge reflux air stripping device, a sludge reflux buffer tank, a sludge reflux liquid lift pipe, a sludge reflux water outlet pipe, a sludge reflux regulating valve, and a second top cover, and the sludge reflux buffer tank is an open structure with an upper end opening. The air outlet of the first fan is connected to the fan outlet main pipe, the sludge reflux air stripping device is located at the bottom of the membrane tank, and the fan outlet main pipe, the sludge reflux air inlet pipe, and the air inlet of the sludge reflux air stripping device are connected in sequence. The sludge reflux buffer tank is located above the membrane tank, and the membrane tank can provide support for the sludge reflux buffer tank. The inlet of the sludge reflux liquid lift pipe is connected to the sludge reflux air stripping device, the sludge reflux liquid lift pipe passes through the sludge reflux buffer tank, and the outlet end of the sludge reflux liquid lift pipe is located in the sludge reflux buffer tank. At the same time, a second buffer tank overflow port is provided on the side wall of the sludge return buffer tank; the inlet of the sludge return outlet pipe is connected to the sludge return buffer tank, and the outlet end of the sludge return outlet pipe is located in the aerobic tank; the sludge return regulating valve is provided on the sludge return outlet pipe. At the same time, the second top cover is located at the outlet end of the sludge return riser pipe; with this structure, the second top cover can prevent the sludge in the sludge return riser pipe from flowing out of the membrane tank due to excessive sludge flow rate.

[0047] The mixed liquor reflux assembly includes a mixed liquor reflux air inlet pipe, a mixed liquor reflux air stripping device, a mixed liquor reflux buffer tank, a mixed liquor reflux liquid lift pipe, a mixed liquor reflux water outlet pipe, a mixed liquor reflux regulating valve, and a third top cover. The mixed liquor reflux buffer tank is an open structure with an upper end opening. The mixed liquor reflux air stripping device is located at the bottom of the aerobic tank, and the fan air outlet main pipe, the mixed liquor reflux air inlet pipe, and the air inlet of the mixed liquor reflux air stripping device are connected in sequence. The mixed liquor reflux buffer tank is located above the aerobic tank, and the aerobic tank can provide support for the mixed liquor reflux buffer tank. The inlet of the mixed liquor reflux liquid lift pipe is connected to the mixed liquor reflux air stripping device, the mixed liquor reflux liquid lift pipe passes through the mixed liquor reflux buffer tank, and the outlet end of the mixed liquor reflux liquid lift pipe is located in the mixed liquor reflux buffer tank. A third buffer tank overflow port is provided on the side wall of the mixed liquor reflux buffer tank, and the reflux mixed liquor in the mixed liquor reflux buffer tank can return to the aerobic tank through the third buffer tank overflow port. The inlet of the mixed liquid reflux outlet pipe is connected to the mixed liquid reflux buffer tank, and the outlet end of the mixed liquid reflux outlet pipe is located in the anoxic tank; the mixed liquid reflux regulating valve is arranged on the mixed liquid reflux outlet pipe. Meanwhile, the third top cover is located at the outlet end of the mixed liquid reflux riser pipe; with this structure, the third top cover can prevent the mixed liquid in the mixed liquid reflux riser pipe from flowing out of the aerobic tank due to excessive flow rate.

[0048] In this structure, the first fan serves as an air source to provide air for aeration and air stripping of other parts. Specifically, in the sludge return assembly, the first fan outputs air to the sludge return air stripping device through the fan outlet main pipe and the sludge return air inlet pipe in turn; driven by the air, the sludge in the membrane tank enters the sludge return buffer tank through the sludge return air stripping device and the sludge return liquid lifting pipe in turn; in the sludge return buffer tank, the sludge in the sludge return buffer tank can return to the membrane tank through the overflow port of the second buffer tank, and the air in the sludge can be discharged through the open port at the upper end; the sludge in the sludge return buffer tank is then sent to the aerobic tank through the sludge return water outlet pipe.

[0049] In the mixed liquid reflux component, the first fan sequentially delivers air to the mixed liquid reflux air stripping device through the fan air outlet main pipe and the mixed liquid reflux air inlet pipe; driven by the air, the sewage in the aerobic tank is mixed with the air to obtain a reflux mixed liquid; the reflux mixed liquid sequentially enters the mixed liquid reflux buffer tank through the mixed liquid reflux air stripping device and the mixed liquid reflux lift pipe; in the mixed liquid reflux buffer tank, the reflux mixed liquid in the mixed liquid reflux buffer tank can return to the aerobic tank through the overflow port of the third buffer tank, and the air in the reflux mixed liquid can be discharged through the open port at the upper end; the reflux mixed liquid in the mixed liquid reflux buffer tank is then sent to the anoxic tank through the mixed liquid reflux outlet pipe.

[0050] Furthermore, it also includes a sixth regulating valve arranged on the fan outlet main pipe; preferably, the first regulating valve is a manual ball valve. The sludge return regulating valve and the mixed liquid return regulating valve are solenoid valves respectively, and the sludge return regulating valve and the mixed liquid return regulating valve are respectively connected to the control system.

[0051] Furthermore, it also includes a first aeration tube arranged in the membrane pool, a second aeration tube arranged in the aerobic pool, and a third aeration tube arranged in the anoxic pool; wherein, the air inlet end of the first aeration tube is connected to the fan outlet main pipe, and the outlet end of the first aeration tube is located at the bottom end of the membrane pool; the air inlet end of the second aeration tube is connected to the fan outlet main pipe, and the air outlet end of the second aeration tube is located at the bottom end of the aerobic pool; the air inlet end of the third aeration tube is connected to the fan outlet main pipe, and the air outlet end of the third aeration tube is located at the bottom end of the anoxic pool. It also includes a water outlet trough, a water outlet weir plate, and a water outlet pipe, wherein the water outlet trough is arranged in the aerobic pool, the water outlet weir plate is arranged on the inner side of the water outlet trough, the water outlet trough is connected to the membrane pool through the water outlet pipe, and the water outlet end of the water outlet pipe is located below the membrane assembly; with this structure, the sewage in the aerobic pool can enter the water outlet trough through the water outlet weir plate, and the sewage in the water outlet trough enters the membrane pool through the water outlet pipe. In the structure, a first aeration pipe, a second aeration pipe and a third aeration pipe are provided, which are used for stirring and aeration respectively. A water hole is provided at the bottom of the partition between the anoxic tank and the aerobic tank, and a water outlet trough (10) is provided in the aerobic tank, and the water outlet trough is located at the top of the partition between the aerobic tank and the membrane tank.

[0052] Furthermore, it also includes a self-priming water inlet pipe, a self-priming pump connected to a control system, and a self-priming water outlet pipe. The self-priming water inlet pipe, the self-priming pump, and the self-priming water outlet pipe are connected in sequence. The self-priming water inlet pipe is located outside the membrane assembly and the clean water in the membrane pool can be sent into the clean water tank through the self-priming water inlet pipe, the self-priming pump, and the self-priming water inlet pipe in sequence.

[0053] Preferably, the first fan and the self-priming pump are respectively arranged in the equipment room.

[0054] The working process of the device is as follows:

[0055] (1) After pretreatment, the sewage enters the anoxic tank and reacts with the return mixed liquid from the aerobic tank. After the reaction is completed, it enters the aerobic tank through the bottom water hole;

[0056] (2) The sewage enters the aerobic tank and mixes with the sludge from the membrane tank for aeration, mixing and reaction;

[0057] (3) The sewage treated in the aerobic tank enters the membrane tank through the outlet trough, outlet weir plate and outlet pipe in sequence;

[0058] (4) The membrane components in the membrane pool are connected to a self-priming pump outside, which draws clean water into the clean water pool and discharges it after meeting the standards.

[0059] The working process of the aeration and air stripping unit is described as follows.

[0060] When the device is working, the first fan aerates the anoxic tank, aerobic tank and membrane tank respectively, and supplies air to the sludge reflux air stripping device and the mixed liquid reflux air stripping device respectively; then, the air intake is controlled by pipeline distribution. The process of sludge reflux air stripping is as follows: air enters the sludge reflux air stripping device and mixes with the sludge; since the density of the sludge after air mixing is relatively small, it will produce a density difference with the external raw liquid of the sludge reflux air stripping device, and a liquid level difference will be formed inside and outside the sludge reflux riser, and the reflux sludge will rise from the sludge reflux riser to the sludge reflux buffer tank at the top of the membrane tank; after the reflux sludge enters the sludge reflux buffer tank, the gas in it will be released and temporarily stored for a short time; after the gas is released, the reflux sludge is sent to the aerobic tank through the sludge reflux outlet pipe.

[0061] The process of mixed liquor reflux gas stripping is as follows: air enters the mixed liquor reflux gas stripping device and mixes with the sewage in the aerobic tank to obtain a reflux mixed liquor; since the sewage after air mixing has a lower density, it will produce a density difference with the external raw liquid of the mixed liquor reflux gas stripping device, and a liquid level difference will be formed inside and outside the mixed liquor reflux riser, and the reflux mixed liquor will rise from the mixed liquor reflux riser to the mixed liquor reflux buffer tank at the top of the aerobic tank; after the reflux sludge enters the mixed liquor reflux buffer tank, the gas therein will be released and temporarily stored for a short time; after the gas is released, the reflux mixed liquor is sent to the anoxic tank through the mixed liquor reflux outlet pipe.

[0062] In the present application, the sludge return buffer tank and the mixed liquor return buffer tank respectively adopt an open structure with an opening at the upper end, and the second buffer tank overflow port and the third buffer tank overflow port are correspondingly arranged on the side wall. The adoption of this structure can ensure the release of air, and when the sludge flow returned by the sludge return riser pipe is too much, and the return mixed liquor flow returned by the mixed liquor return riser pipe is too much, and the corresponding sludge return outlet pipe and mixed liquor return outlet pipe are too late to discharge, they are returned to the aerobic tank and the anoxic tank accordingly. Based on the setting of the overflow structure, the difficulty of distributing and controlling the aeration amount of the fan can be effectively reduced, and the effective control of the return amount can be achieved.

[0063] The above improvements are only preferred embodiments of the type and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An airlift MBR integrated sewage treatment device, characterized in that: It includes an anoxic tank, an aerobic tank, a membrane tank, a clean water tank, an aeration and air stripping unit, and a control system, wherein a membrane assembly is arranged in the membrane tank; The aeration and air stripping unit includes a first fan connected to a control system, a fan air outlet main pipe, a sludge return component, and a mixed liquid return component; The sludge return assembly comprises a sludge return air inlet pipe, a sludge return air lift device, a sludge return buffer tank, a sludge return liquid lift pipe, a sludge return water outlet pipe, and a sludge return regulating valve. The sludge return buffer tank is an open structure with an opening at the upper end. The air outlet of the first fan is connected to the fan outlet main pipe and the first fan can output air to the fan outlet main pipe, the sludge reflux air stripping device is located at the bottom of the membrane tank, the fan outlet main pipe, the sludge reflux air inlet pipe, and the air inlet of the sludge reflux air stripping device are connected in sequence, and the air in the fan outlet main pipe can enter the sludge reflux air stripping device through the sludge reflux air inlet pipe; The sludge return buffer tank is located above the membrane tank and the membrane tank can provide support for the sludge return buffer tank; The inlet of the sludge return lift pipe is connected to the sludge return air stripping device, the sludge return lift pipe passes through the sludge return buffer tank, the outlet end of the sludge return lift pipe is located in the sludge return buffer tank, and the sludge in the membrane tank can enter the sludge return buffer tank through the sludge return air stripping device and the sludge return lift pipe in sequence; A second buffer tank overflow port is provided on the side wall of the sludge return buffer tank, and the sludge in the sludge return buffer tank can return to the membrane tank through the second buffer tank overflow port; The inlet of the sludge return outlet pipe is connected to the sludge return buffer tank, the outlet end of the sludge return outlet pipe is located in the aerobic tank, and the sludge in the sludge return buffer tank can be sent into the aerobic tank through the sludge return outlet pipe; the sludge return regulating valve is arranged on the sludge return outlet pipe; The mixed liquid reflux assembly comprises a mixed liquid reflux air inlet pipe, a mixed liquid reflux air stripping device, a mixed liquid reflux buffer tank, a mixed liquid reflux liquid riser, a mixed liquid reflux water outlet pipe, and a mixed liquid reflux regulating valve. The mixed liquid reflux buffer tank is an open structure with an upper end opening; The mixed liquid reflux stripping device is located at the bottom of the aerobic tank, the fan outlet main pipe, the mixed liquid reflux air inlet pipe, and the air inlet of the mixed liquid reflux stripping device are connected in sequence, and the air in the fan outlet main pipe can enter the mixed liquid reflux air stripping device through the mixed liquid reflux air inlet pipe; The mixed liquid reflux buffer tank is located above the aerobic tank and the aerobic tank can provide support for the mixed liquid reflux buffer tank; the inlet of the mixed liquid reflux lift pipe is connected to the mixed liquid reflux gas stripping device, the mixed liquid reflux lift pipe passes through the mixed liquid reflux buffer tank, the outlet end of the mixed liquid reflux lift pipe is located in the mixed liquid reflux buffer tank, and the sewage in the aerobic tank can be mixed with air through the mixed liquid reflux gas stripping device to obtain a mixed liquid and sent to the mixed liquid reflux buffer tank through the mixed liquid reflux lift pipe; A third buffer tank overflow port is provided on the side wall of the mixed liquid reflux buffer tank, and the mixed liquid in the mixed liquid reflux buffer tank can return to the aerobic tank through the third buffer tank overflow port; The inlet of the mixed liquid reflux outlet pipe is connected to the mixed liquid reflux buffer tank, the outlet end of the mixed liquid reflux outlet pipe is located in the anoxic tank, and the mixed liquid in the mixed liquid reflux buffer tank can be sent into the anoxic tank through the mixed liquid reflux outlet pipe; the mixed liquid reflux regulating valve is arranged on the mixed liquid reflux outlet pipe.

2. The device according to claim 1, characterized in that: It also includes a second top cover, which is located at the outlet end of the sludge return riser and can prevent the sludge in the sludge return riser from flowing out of the membrane pool due to excessive sludge flow rate.

3. The device according to claim 1, characterized in that: It also includes a third top cover, which is located at the outlet end of the mixed liquid reflux riser pipe and can prevent the mixed liquid in the mixed liquid reflux riser pipe from flowing out of the aerobic tank due to excessive flow rate.

4. The device according to claim 1, characterized in that: It also includes a sixth regulating valve, which is arranged on the fan air outlet main pipe.

5. The device according to claim 4, characterized in that: The sixth regulating valve is a manual ball valve; Or the sixth regulating valve is a solenoid valve, and the sixth regulating valve is connected to a control system.

6. The device according to any one of claims 1 to 5, characterized in that: The sludge return regulating valve and the mixed liquor return regulating valve are solenoid valves respectively, and the sludge return regulating valve and the mixed liquor return regulating valve are respectively connected to the control system.

7. The device according to claim 1, characterized in that: It also includes a water outlet trough, a water outlet weir plate, and a water outlet pipe. The water outlet trough is arranged in the aerobic pool. The water outlet weir plate is arranged on the inner side of the water outlet trough and the sewage in the aerobic pool can enter the water outlet trough through the water outlet weir plate. The water outlet trough is connected to the membrane pool through the water outlet pipe and the sewage in the water outlet trough enters the membrane pool through the water outlet pipe. The water outlet end of the water outlet pipe is located below the membrane assembly.

8. The device according to claim 1, characterized in that: It also includes a first aeration pipe arranged in the membrane tank, a second aeration pipe arranged in the aerobic tank, and a third aeration pipe arranged in the anoxic tank; The air inlet end of the first aeration pipe is connected to the fan air outlet main pipe, and the outlet end of the first aeration pipe is located at the bottom end of the membrane tank; The air inlet end of the second aeration pipe is connected to the fan air outlet main pipe, and the air outlet end of the second aeration pipe is located at the bottom end of the aerobic tank; The air inlet end of the third aeration pipe is connected to the main air outlet pipe of the fan, and the air outlet end of the third aeration pipe is located at the bottom end of the anoxic tank.

9. The device according to claim 1, characterized in that: It also includes a self-priming water inlet pipe, a self-priming pump connected to a control system, and a self-priming water outlet pipe, wherein the self-priming water inlet pipe, the self-priming pump, and the self-priming water outlet pipe are connected in sequence, the self-priming water inlet pipe is located outside the membrane assembly, and the clean water in the membrane pool can be sequentially delivered to the clean water tank through the self-priming water inlet pipe, the self-priming pump, and the self-priming water outlet pipe.

10. The device according to claim 9, characterized in that: It also includes an equipment room, in which the first fan and the self-priming pump are respectively arranged.

Images