Sludge reduction treatment system based on A2O process

Abstract

The utility model discloses a sludge reduction treatment system based on A2O process, which comprises an A2O tank, a secondary sedimentation tank, a sludge pump tank, a bacteria culture tank and a sludge storage tank, an outlet of the A2O tank is connected with the secondary sedimentation tank, an outlet of the secondary sedimentation tank is connected with the sludge pump tank, one outlet of the sludge pump tank is connected with the sludge storage tank, the other outlet is divided into two pipelines, one pipeline is in reflux connection with an anaerobic zone of the A2O tank, and the other pipeline is in reflux connection with a bacteria culture tank. The other pipeline is connected with a bacterium cultivation pool, and an outlet of the bacterium cultivation pool is connected with the aerobic zone of the A2O pool. Through the optimization and improvement of the A2O biochemical process system, the sludge is treated by the biological enhancement reactor, so that the generation of residual sludge is reduced from the source on the premise of keeping the biochemical treatment effect of the sludge unchanged, and the subsequent sludge dewatering, transportation and terminal treatment costs are greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of sludge treatment, and in particular relates to a sludge reduction treatment system based on an A2O process. Background Art

[0002] The A2O (anaerobic-anoxic-aerobic) process is a commonly used treatment process in sewage treatment plants and is a type of activated sludge process. The wastewater treatment process produces a large amount of sludge. The residual sludge often contains a large amount of toxic and hazardous substances and organic matter. If not properly treated and disposed of, it will cause direct or potential secondary pollution to the environment. To reduce the impact of sludge pollution, sludge reduction technology has been proposed.

[0003] Chinese patent CN108467167A discloses a process for reducing excess biological sludge in sewage treatment plants. The process mainly consists of a jet wall-breaking reactor, an anaerobic digestion reactor, and an aerobic digestion reactor. The process can achieve a sludge reduction of more than 70%, but the process system has high energy consumption and high operating costs. Utility Model Content

[0004] In view of the above problems, the purpose of the present invention is to provide a sludge reduction treatment system based on the A2O process.

[0005] The specific technical solutions are as follows:

[0006] A sludge reduction treatment system based on the A2O process includes an A2O tank, a secondary sedimentation tank, a sludge pump tank, a bacterial culture tank and a sludge storage tank. The outlet of the A2O tank is connected to the secondary sedimentation tank, the outlet of the secondary sedimentation tank is connected to the sludge pump tank, one outlet of the sludge pump tank is connected to the sludge storage tank, and the other outlet is divided into two pipelines, one pipeline is connected to the anaerobic zone of the A2O tank for reflux, and the other pipeline is connected to the bacterial culture tank. The outlet of the bacterial culture tank is connected to the aerobic zone of the A2O tank.

[0007] Furthermore, a baffle is provided at the bottom of the sludge pump pool to divide the sludge pump pool into two areas. The bottom of one area is connected to the secondary sedimentation tank. A sludge return pump is provided in this area, and the outlet of the sludge return pump is divided into two pipes, which are respectively connected to the anaerobic zone and the culture tank of the A2O tank; a residual sludge pump is provided in the other area, and the outlet of the residual sludge pump is connected to the sludge storage tank.

[0008] Furthermore, a sludge return pipe enhanced bioreactor is provided on the pipeline connecting the sludge return pump and the anaerobic zone of the A2O tank.

[0009] Furthermore, a baffle is provided in the culture pool to divide the culture pool into two areas, each area is provided with a flow pusher, one area is provided with a culture pool circulation pump, and the outlet pipe of the culture pool circulation pump is divided into two pipes, one pipe is provided with a culture pool enhanced bioreactor and refluxes to connect to the other area, and the other pipe is connected to the aerobic area of ​​the A2O pool.

[0010] Furthermore, the anoxic zone is located between the anaerobic zone and the aerobic zone of the A2O tank. The interior of the sludge return pipe enhanced bioreactor and the culture tank enhanced bioreactor are made of multi-potential alloy materials. Expansion joints and pressure gauges are installed before and after the pipelines of the sludge return pipe enhanced bioreactor and the culture tank enhanced bioreactor.

[0011] The beneficial effects of the present invention are:

[0012] 1) Through the optimization and improvement of the A2O biochemical process system itself, the sludge is treated in a bio-augmented reactor. While maintaining the sludge biochemical treatment effect, the generation of excess sludge is reduced from the source, which will greatly reduce the subsequent sludge dewatering, transportation and terminal disposal costs;

[0013] 2) The activated sludge treated by the enhanced bioreactor in the culture tank can be used as a culture medium for bacterial strains without the need for additional nutrients. The dominant bacterial strains of sludge that have been domesticated and inoculated and put into the system at one time improve the biodegradability of microbial debris and ensure the stable operation of the sewage treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present utility model.

[0015] In the figure: 1. A2O tank; 11. Anaerobic zone; 12. Anoxic zone; 13. Aerobic zone; 2. Secondary sedimentation tank; 3. Sludge pump tank; 31. Sludge return pump; 32. Residual sludge pump; 33. Sludge return pipe enhanced bioreactor; 4. Bacteria culture tank; 41. Flow pusher; 42. Bacteria culture tank circulation pump; 43. Bacteria culture tank enhanced bioreactor; 5. Sludge storage tank. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings, but the protection scope of the present invention is not limited thereto.

[0017] like Figure 1As shown, a sludge reduction treatment system based on the A2O process includes an A2O tank 1, a secondary sedimentation tank 2, a sludge pump tank 3, a culture tank 4 and a sludge storage tank 5. The A2O tank 1 is provided with an anaerobic zone 11, an anoxic zone 12 and an aerobic zone 13 from upstream to downstream. The outlet of the A2O tank 1 is connected to the secondary sedimentation tank 2. A baffle is provided at the bottom of the sludge pump tank 3 to divide the sludge pump tank 3 into two areas. The bottom of one area is connected to the secondary sedimentation tank 2. A sludge return pump 31 is provided in the area, and a residual sludge pump 32 is provided in the other area. The outlet of the residual sludge pump 32 is connected to the sludge storage tank 5. The outlet of the sludge return pump 31 is divided into two pipelines. A sludge return pipe enhanced bioreactor 33 is provided on one pipeline and extends to connect the anaerobic zone of the A2O tank 1. The other pipeline is connected to the culture pool 4. A baffle is provided inside the culture pool 4 to divide the culture pool 4 into two areas. A flow promoter 41 is provided in each area. A culture pool circulation pump 42 is provided in one area. The outlet pipeline of the culture pool circulation pump 42 is divided into two pipelines. One pipeline is provided with a culture pool enhanced bioreactor 43 and is connected to the other area through backflow. The other pipeline is connected to the aerobic zone 13 of the A2O tank 1. The interiors of the sludge return pipe enhanced bioreactor 33 and the culture pool enhanced bioreactor 43 are made of multi-potential alloy material. Expansion joints and pressure gauges are installed before and after the pipelines of the sludge return pipe enhanced bioreactor 33 and the culture pool enhanced bioreactor 43. The volume of the culture pool 4 is 10-20% of that of the A2O tank 1.

[0018] A sludge reduction treatment process using the above system comprises the following steps:

[0019] 1) Startup phase: After pretreatment, the wastewater is transported to A2O tank 1 for biochemical treatment. The effluent from A2O tank 1 is transported to secondary sedimentation tank 2 for sedimentation and stratification. The sludge from secondary sedimentation tank 2 is transported to sludge pump tank 3.

[0020] 2) Bacteria cultivation stage: After the system runs stably, the sewage containing activated sludge in the sludge pump pool 3 is transported to the bacteria cultivation pool 4 through the sludge return pump 31. When the sludge volume reaches the effective volume of the bacteria cultivation pool, the transportation is stopped. The bacteria cultivation pool enhanced bioreactor 43 circulates the sludge. The treated sludge is used as a nutrient base for the high-efficiency aerobic composite engineered bacteria. The engineered bacteria are then added to the bacteria cultivation pool 4. The flow pusher 41 is turned on and the power of the flow pusher 41 is not less than 5 w / m 3 Pool volume, domestication and cultivation of high-efficiency composite engineered bacteria;

[0021] 3) Operational stage: To better adapt to the biochemical system, the activated sludge rich in high-efficiency composite engineered bacteria is pumped into the aerobic zone 13 of the A2O tank 1 in 4-6 batches through the culture tank circulation pump 42. The sludge return pipe enhanced bioreactor 33 is started. The sludge containing high-efficiency composite engineered bacteria in the sludge pump tank 3 is treated by the sludge return pipe enhanced bioreactor 33 and then returned to the anaerobic zone 11 of the A2O tank 1. The residual sludge pump 32 transports the residual sludge in the sludge pump tank 3 to the sludge storage tank 5. To mitigate the impact on the biochemical system and allow the system to better adapt, the operation time of the sludge return pipe enhanced bioreactor is increased in stages until it is put into operation at 100% load. The operation process of the enhanced bioreactor 33 in the sludge return pipe in step 3) is divided into five stages, specifically the first stage: working 4 hours a day for three days, continuously observing the system effluent treatment indicators (SS, COD, ammonia nitrogen, total nitrogen, total phosphorus, pH, etc.). If the effluent is normal (meets the discharge standard), enter the next stage; the second stage: working 6 hours a day for three days, continuously observing the system effluent treatment indicators. If the effluent is normal, enter the next stage; the third stage: working 12 hours a day for three days, continuously observing the system effluent treatment indicators. If the effluent is normal, enter the next stage; the fourth stage: working 18 hours a day for three days, continuously observing the system effluent treatment indicators. If the effluent is normal, enter the next stage; the fifth stage: working 24 hours a day for three days, continuously observing the system effluent treatment indicators. If the effluent is normal, enter the stable operation stage.

[0022] Taking a sewage treatment plant with a sewage treatment capacity of 60,000 tons / day as an example, the sewage treatment volume of the first phase is 30,000 tons / day. As a blank group, no treatment is adopted. The sewage treatment volume of the second phase is 30,000 tons / day. After the sludge reduction treatment system based on the A2O process of the utility model is used for treatment, the sludge discharge is calculated after the system runs stably.

[0023] Table 1 Summary of average daily mud production under different conditions

[0024]

Claims

1. A sludge reduction treatment system based on A2O process, characterized in that: The invention comprises an A2O tank (1), a secondary sedimentation tank (2), a sludge pump tank (3), a bacterial culture tank (4) and a sludge storage tank (5), wherein the outlet of the A2O tank (1) is connected to the secondary sedimentation tank (2), the outlet of the secondary sedimentation tank (2) is connected to the sludge pump tank (3), one outlet of the sludge pump tank (3) is connected to the sludge storage tank (5), and the other outlet is divided into two pipelines, one pipeline is connected to the anaerobic zone (11) of the A2O tank (1) for reflux, and the other pipeline is connected to the bacterial culture tank (4), and the outlet of the bacterial culture tank (4) is connected to the aerobic zone (13) of the A2O tank (1).

2. A sludge reduction treatment system based on A2O process according to claim 1, characterized in that: A baffle is provided at the bottom of the sludge pump pool (3) to divide the sludge pump pool (3) into two areas. The bottom of one area is connected to the secondary sedimentation tank (2). A sludge return pump (31) is provided in the area. The outlet of the sludge return pump (31) is divided into two pipelines, which are respectively connected to the anaerobic zone (11) of the A2O tank (1) and the bacterial culture tank (4). A residual sludge pump (32) is provided in the other area. The outlet of the residual sludge pump (32) is connected to the sludge storage tank (5).

3. The sludge reduction treatment system based on the A2O process according to claim 2, characterized in that: A sludge return pipe enhanced bioreactor (33) is provided on the pipeline connecting the sludge return pump (31) and the anaerobic zone (11) of the A2O tank (1).

4. A sludge reduction treatment system based on A2O process as claimed in claim 3, characterized in that: A baffle is provided in the culture pool (4) to divide the culture pool (4) into two areas. A flow pusher (41) is provided in each area. A culture pool circulation pump (42) is provided in one area. The outlet pipe of the culture pool circulation pump (42) is divided into two pipes. A culture pool enhanced bioreactor (43) is provided on one pipe and is refluxed to connect to the other area. The other pipe is connected to the aerobic zone (13) of the A2O pool (1).

5. The sludge reduction treatment system based on the A2O process according to claim 4, characterized in that: The anoxic zone (12) is located between the anaerobic zone (11) and the aerobic zone (13) of the A2O tank (1).

6. A sludge reduction treatment system based on A2O process as claimed in claim 4, characterized in that: Expansion joints and pressure gauges are installed before and after the pipelines of the sludge return pipe enhanced bioreactor (33) and the culture tank enhanced bioreactor (43).

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