MABR-OSA sludge reduction device

Abstract

The utility model discloses an MABR-OSA sludge reduction device, which relates to the technical field of sewage treatment and mainly comprises a water inlet tank, an MABR reaction tank, an aerobic tank, a sedimentation tank, an anaerobic reactor and a gas supply system. The MABR reaction tank and the aerobic tank meet the requirements of the system on denitrification; an anaerobic reactor is additionally arranged in a sludge backflow section, a part of a carbon source is introduced into an MABR reaction tank, and sludge is alternately reduced in an aerobic environment and an anaerobic environment. The device has the advantages of simple structure, easiness in operation, obvious sludge reduction, good sewage treatment effect and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and specifically relates to a MABR-OSA sludge reduction device. Background Art

[0002] The activated sludge method has the characteristics of high pollutant removal rate and low cost, and has become a typical process for sewage treatment. However, the application of this technology produces a large amount of excess activated sludge. The treatment and disposal of excess sludge in sewage treatment plants is one of the main operating costs. The excess sludge may contain heavy metals, pathogens and organic pollutants, etc., and the sludge needs to be properly treated and disposed of. However, most treatment technologies have high energy consumption, high treatment costs or use a large amount of chemicals, accompanied by secondary pollution problems. Sludge in-situ reduction technology has become an effective way to solve the problem of large amounts of excess sludge. Among various in-situ reduction technologies, the aerobic-sedimentation-anaerobic (OSA) process has the characteristics of low energy consumption, obvious reduction effect, and no secondary pollution. It is considered to be an ideal reduction method and has broad prospects in practical engineering applications.

[0003] The OSA process consists of an aerobic tank, a sedimentation tank and an anaerobic reactor. An anaerobic reactor is added to the sludge return section of the activated sludge process. The sludge stays in the anaerobic reactor for a period of time and then returns to the main reaction area. The sludge alternates between aerobic and anaerobic environments, which not only reduces the amount of sludge, but also is conducive to the growth of polyphosphate bacteria and enhances phosphorus removal.

[0004] The OSA process can be combined with other technologies to reduce sludge, for example, using ultrasound, ozone, chemical uncouplers, etc. Although these technologies significantly reduce the generation of excess sludge, they have a high implementation cost. The combination of membrane aerated bioreactor (MABR) and OSA process can be used to reduce sludge production. Membrane aerated bioreactor (MABR) is an efficient treatment system that combines gas diffusion membrane technology with biofilm technology. It uses a breathable membrane to provide the necessary oxygen for microorganisms and encourages microorganisms to attach and grow on the outer surface of the membrane. Compared with the traditional activated sludge method and MBR process, MABR has shown significant advantages, with high oxygen transfer efficiency, which can transfer oxygen to microorganisms more quickly and effectively, thereby improving the efficiency of biological reactions; low power consumption, which can save a lot of energy costs during operation; it is worth mentioning that MABR produces less sludge during the treatment process, which not only reduces the burden of sludge treatment, but also further improves the efficiency and sustainability of the entire treatment system. Utility Model Content

[0005] In summary, the utility model provides a MABR-OSA sludge reduction device, and the system is mainly composed of a MABR reaction tank, an aerobic tank, a sedimentation tank and an anaerobic reactor. The main reaction zone meets the system's requirements for denitrification. The biofilm of the MABR reaction tank has anaerobic, facultative and aerobic functional processes at the same time, and can achieve simultaneous nitrification and denitrification, especially in the MABR reaction tank, the nitrification liquid returned from the aerobic zone and the organic carbon source in the sewage are used to complete denitrification. An anaerobic reactor is added to the sludge return section. The sludge stays in the anaerobic reactor for a period of time and then flows back to the main reaction zone, which introduces part of the carbon source into the MABR reaction tank. The sludge is reduced by alternating between aerobic and anaerobic environments.

[0006] The utility model is realized by the following technical solutions:

[0007] The MABR-OSA sludge reduction device is characterized in that it is mainly composed of a water inlet tank, a MABR reaction tank, an aerobic tank, a sedimentation tank, an anaerobic reactor and a gas supply system. The water inlet tank is arranged at the front end of the MABR reaction tank, and sewage is pumped into the MABR reaction tank through a first peristaltic pump. The MABR reaction tank, the aerobic tank and the sedimentation tank are connected in sequence. The water outlet is arranged at the end of the sedimentation tank. The anaerobic reactor receives part of the sludge in the sedimentation tank. The gas supply system mainly includes gas supply equipment, pipelines, valves and pressure gauges, and gas is supplied to the MABR reaction tank and the aerobic tank through pipelines respectively.

[0008] The MABR reaction tank is provided with a MABR membrane assembly and a first bottom aerator; the first bottom aerator receives the gas outlet of the MABR membrane assembly through a pipeline, and uses a first valve to adjust the gas volume;

[0009] The aerobic tank is provided with a filler and a second bottom aerator; the end of the aerobic tank is provided with a nitrification liquid reflux, which is refluxed to the front end of the MABR reaction tank through a second peristaltic pump;

[0010] 50%-80% of the sludge in the sedimentation tank flows into the anaerobic reactor through the first sludge return pump, and 20%-50% of the remaining sludge is discharged.

[0011] Furthermore, the gas supply device is connected to the MABR membrane assembly of the MABR reaction tank through a pipeline, a second valve and a pressure gauge, and the gas supply volume is adjusted by the second valve.

[0012] Furthermore, the nitrification liquid reflux ratio of the aerobic pool is 100%-200%.

[0013] Furthermore, an agitator is provided in the anaerobic reactor, and the sludge enters the front end of the MABR reaction tank through a second sludge return pump.

[0014] Furthermore, the filler of the aerobic pool is selected from one or more of fiber filler, ecological rope, and combined filler.

[0015] Furthermore, the gas supply device is connected to the second bottom aerator of the aerobic tank through a pipeline and a third valve, and the gas supply volume is adjusted by the third valve.

[0016] The utility model discloses a MABR-OSA sludge reduction device. The MABR reaction tank and the aerobic tank meet the system's requirements for denitrification. An anaerobic reactor is added to the sludge return section, and part of the carbon source is introduced into the MABR reaction tank. The sludge is alternately reduced in an aerobic and anaerobic environment. The device has the advantages of simple structure, easy operation, significant sludge reduction, and good sewage treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is a schematic diagram of the elevation structure of the utility model.

[0018] In the figure: 1, water inlet tank, 2, first peristaltic pump, 3, first valve, 4, MABR membrane assembly, 5, MABR reaction tank, 6, pressure gauge, 7, second valve, 8, third valve, 9, gas supply equipment, 10, aerobic tank, 11, filler, 12, sedimentation tank, 13, water outlet, 14, anaerobic reactor, 15, first bottom aerator, 16, second bottom aerator, 17, agitator, 18, second peristaltic pump, 19, first sludge return pump, 20, second sludge return pump. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects of the utility model easy to understand, please refer to Figure 1 , the utility model is further explained below in conjunction with specific implementation methods.

[0020] A MABR-OSA sludge reduction device is mainly composed of an inlet tank 1, a MABR reaction tank 5, an aerobic tank 10, a sedimentation tank 12, an anaerobic reactor 14 and an air supply system. The inlet tank 1 is arranged at the front end of the MABR reaction tank 5, and sewage is pumped into the MABR reaction tank 5 through a first peristaltic pump 2. The MABR reaction tank 5, the aerobic tank 10 and the sedimentation tank 12 are connected in sequence. The outlet 13 is arranged at the end of the sedimentation tank 12. The anaerobic reactor 14 receives part of the sludge from the sedimentation tank 12. The air supply system mainly includes an air supply device 9, a pipeline, a valve and a pressure gauge 6. The air supply system is respectively supplied to the MABR reaction tank 5 through the pipeline. The MABR reaction tank 5 and the aerobic tank 10 are gas-supplied; the MABR membrane assembly 4 and the first bottom aerator 15 are arranged in the MABR reaction tank 5; the first bottom aerator 15 receives the gas outlet of the MABR membrane assembly 4 through a pipeline, and the gas volume is adjusted by the first valve 3; the filler 11 and the second bottom aerator 16 are arranged in the aerobic tank 10; the nitrification liquid reflux is arranged at the end of the aerobic tank 10, and refluxes to the front end of the MABR reaction tank 5 through the second peristaltic pump 18; 50%-80% of the sludge in the sedimentation tank 12 flows into the anaerobic reactor 14 through the first sludge reflux pump 19, and 20%-50% of the remaining sludge is discharged.

[0021] Among them, the gas supply equipment 9 is connected to the MABR membrane assembly 4 of the MABR reaction tank 5 through a pipeline, a second valve 7 and a pressure gauge 6, and the gas supply volume is adjusted by the second valve 7. The gas supply equipment 9 is connected to the second bottom aerator 16 of the aerobic tank 10 through a pipeline and a third valve 8, and the gas supply volume is adjusted by the third valve 8; the nitrification liquid reflux ratio of the aerobic tank 10 is 100%-200%; an agitator 17 is arranged in the anaerobic reactor 14, and the sludge enters the front end of the MABR reaction tank 5 through the second sludge reflux pump 20.

[0022] In this embodiment, the filler 11 of the aerobic pool 10 is a combined filler.

[0023] In other different embodiments, different fillers 11 may be selected, such as fiber fillers or ecological ropes; or two or more of fiber fillers, ecological ropes and combined fillers may be used.

[0024] The process flow of the utility model is as follows: sewage is pumped into the MABR reaction tank 5 through the water inlet tank 1, and simultaneous nitrification and denitrification are carried out in the MABR reaction tank 5 to degrade organic matter and remove nitrogen; the effluent from the MABR reaction tank 5 enters the aerobic tank 10 for nitrification reaction, and the nitrified liquid in the aerobic tank 10 is refluxed to the MABR reaction tank 5, and denitrification is completed by using the organic carbon source in the sewage; the effluent from the aerobic tank 10 flows into the sedimentation tank 12 for solid-liquid separation and is then discharged from the water outlet 13; a part of the sludge in the sedimentation tank 12 is treated by the anaerobic reactor 14 and enters the MABR reaction tank 5 to achieve sludge reduction, and the remaining sludge is discharged.

[0025] The above implementation is only to illustrate the technical concept and features of the utility model, and its purpose is to enable ordinary technicians in this field to understand the content of the utility model and implement it accordingly, and it cannot be used to limit the protection scope of the utility model. Any technician familiar with the technical field within the technical scope of the utility model, according to the technical solution and its concept of the utility model, shall be covered by the protection scope of the utility model.

Claims

1. A MABR-OSA sludge reduction device, characterized in that: It is mainly composed of an inlet tank, a MABR reaction tank, an aerobic tank, a sedimentation tank, an anaerobic reactor and an air supply system. The inlet tank is arranged at the front end of the MABR reaction tank. The sewage is pumped into the MABR reaction tank through the first peristaltic pump. The MABR reaction tank, the aerobic tank and the sedimentation tank are connected in sequence. The outlet is arranged at the end of the sedimentation tank. The anaerobic reactor receives part of the sludge in the sedimentation tank. The air supply system mainly includes air supply equipment, pipelines, valves and pressure gauges, and air is supplied to the MABR reaction tank and the aerobic tank through pipelines respectively. The MABR reaction tank is provided with a MABR membrane assembly and a first bottom aerator; the first bottom aerator receives the gas outlet of the MABR membrane assembly through a pipeline, and uses a first valve to adjust the gas volume; The aerobic tank is provided with a filler and a second bottom aerator; the end of the aerobic tank is provided with a nitrification liquid reflux, which is refluxed to the front end of the MABR reaction tank through a second peristaltic pump; 50%-80% of the sludge in the sedimentation tank flows into the anaerobic reactor through the first sludge return pump, and 20%-50% of the remaining sludge is discharged.

2. The MABR-OSA sludge reduction device according to claim 1, characterized in that: The gas supply equipment is connected to the MABR membrane assembly of the MABR reaction tank through a pipeline, a second valve and a pressure gauge, and the gas supply volume is adjusted by the second valve.

3. The MABR-OSA sludge reduction device according to claim 1, characterized in that: The nitrification liquid reflux ratio of the aerobic pool is 100%-200%.

4. The MABR-OSA sludge reduction device according to claim 1, characterized in that: The anaerobic reactor is provided with a stirrer, and the sludge enters the front end of the MABR reaction tank through the second sludge return pump.

5. The MABR-OSA sludge reduction device according to claim 1, characterized in that: The filler of the aerobic pool is selected from one or more of fiber filler, ecological rope and combined filler.

6. The MABR-OSA sludge reduction device according to claim 1, characterized in that: The gas supply device is connected to the second bottom aerator of the aerobic tank through a pipeline and a third valve, and the gas supply volume is adjusted through the third valve.

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