Sludge reduction treatment system based on A2O process and process thereof

Abstract

The system 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 of the sludge pump tank is divided into two pipelines, and the two pipelines are communicated with the bacteria culture tank. One pipeline is in reflux connection with the anaerobic zone of the A2O tank, the other pipeline is connected with the bacterium culture tank, and the outlet of the bacterium culture tank is connected with the aerobic zone of the A2O tank. According to the invention, through optimization and improvement of the A2O biochemical process system, the sludge is treated by the biological enhancement reactor, on the premise of keeping the biochemical treatment effect of the sludge unchanged, the generation of residual sludge is reduced from the source, and the subsequent sludge dewatering, transportation and terminal treatment costs are greatly reduced.

Description

Technical Field

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

[0002] A2O (anaerobic-anoxic-aerobic) process is a commonly used treatment process in sewage treatment plants and is a type of activated sludge process. A large amount of sludge is produced during sewage treatment. Conventional sludge reduction technology mainly focuses on the back-end treatment of sludge. The sludge microorganisms are broken by physical or chemical methods to release the water in the microbial cells. The water is then squeezed out by filter pressing to reduce the water content of the sludge, thereby achieving the purpose of sludge reduction. The disadvantage of this method is that it consumes a lot of energy and has high operating costs. Summary of the invention

[0003] In view of the above problems, the object of the present invention is to provide a sludge reduction treatment system and process based on the A2O process.

[0004] The specific technical solutions are as follows: A sludge reduction treatment system based on A2O process comprises an A2O tank, a secondary sedimentation tank, a sludge pump tank, a bacterial culture tank and a sludge storage tank, wherein 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 refluxed and connected to the anaerobic zone of the A2O tank, and the other pipeline is connected to the bacterial culture tank, and the outlet of the bacterial culture tank is connected to the aerobic zone of the A2O tank.

[0005] 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 the area. The outlet of the sludge return pump is divided into two pipelines, which are respectively connected to the anaerobic zone and the bacterial 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.

[0006] 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.

[0007] Furthermore, a baffle is provided in the culture pool to divide the culture pool into two areas, each of the two areas is provided with a flow promoter, one area is provided with a culture pool circulation pump, and the outlet pipeline of the culture pool circulation pump is divided into two pipelines, one pipeline is provided with a culture pool enhanced bioreactor and refluxes to connect to the other area, and the other pipeline is connected to the aerobic area of ​​the A2O pool.

[0008] Furthermore, there is an anoxic zone between the anaerobic zone and the aerobic zone of the A2O tank, the interior of the sludge return pipe enhanced bioreactor and the bacteria culture tank enhanced bioreactor are made of multi-potential alloy materials, and expansion joints and pressure gauges are installed before and after the pipelines of the sludge return pipe enhanced bioreactor and the bacteria culture tank enhanced bioreactor.

[0009] A process for sludge reduction treatment using the above system comprises the following steps: 1) Start-up phase: After pre-treatment, the wastewater is transported to the A2O tank for biochemical treatment. The effluent from the A2O tank is transported to the secondary sedimentation tank for sedimentation and stratification. The sludge in the secondary sedimentation tank is transported to the sludge pump tank. 2) Bacteria cultivation stage: After the system runs stably, the sewage containing activated sludge in the sludge pump pool is transported to the bacteria cultivation pool through the sludge return pump. When the sludge volume reaches the effective volume of the bacteria cultivation pool, the transportation is stopped. The enhanced bioreactor in the bacteria cultivation pool circulates the sludge. The treated sludge is used as the nutrient base of the highly efficient aerobic composite engineered bacteria. Then the engineered bacteria are added to the bacteria cultivation pool, and the flow pusher is turned on to acclimate and cultivate the highly efficient composite engineered bacteria. 3) Operational stage: In order to better adapt to the biochemical system, the activated sludge rich in high-efficiency composite engineering bacteria is pumped into the aerobic zone of the A2O tank in 4-6 batches through the culture tank circulation pump, and the sludge return pipe enhanced bioreactor is started. The sludge containing high-efficiency composite engineering bacteria in the sludge pump tank is treated by the sludge return pipe enhanced bioreactor and then returned to the anaerobic zone of the A2O tank. The residual sludge pump transports the residual sludge in the sludge pump tank to the sludge storage tank.

[0010] Furthermore, the volume of the bacteria culture pool is 10-20% of that of the A2O pool.

[0011] Furthermore, in order to mitigate the impact on the biochemical system and allow the system to adapt better, the operation time of the sludge return pipe enhanced bioreactor increases in stages until it is put into operation at 100% load. The operation process of the sludge return pipe enhanced bioreactor in step 3) is divided into five stages, specifically the first stage: work 4 hours a day for three days, continuously observe the system effluent treatment indicators SS, COD, ammonia nitrogen, total nitrogen, total phosphorus, PH, if the effluent is normal, it reaches the discharge standard and enters the next stage; the second stage: work 6 hours a day for three days, continuously observe the system effluent treatment indicators, if the effluent is normal, enter the next stage; the third stage: work 12 hours a day for three days, continuously observe the system effluent treatment indicators, if the effluent is normal, enter the next stage; the fourth stage: work 18 hours a day for three days, continuously observe the system effluent treatment indicators, if the effluent is normal, enter the next stage; the fifth stage: work 24 hours a day for three days, continuously observe the system effluent treatment indicators, if the effluent is normal, enter the stable operation stage.

[0012] Furthermore, the power of the flow generator is not less than 5 w / m3 Pool volume.

[0013] The beneficial effects of the present invention are: 1) Through the optimization and improvement of the A2O biochemical process system itself, the sludge is treated through a bio-enhanced reactor. Under the premise of maintaining the sludge biochemical treatment effect unchanged, the generation of excess sludge is reduced from the source, which will greatly reduce the subsequent sludge dehydration, transportation and terminal disposal costs; 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 are put into the system at one time, which improves the biodegradability of microbial debris and ensures the stable operation of the sewage treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[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 is further described below in conjunction with 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 bacterial 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. 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. , another pipeline is connected to the bacteria culture pool 4, a baffle is provided in the bacteria culture pool 4 to divide the bacteria culture pool 4 into two areas, both areas are provided with a flow pusher 41, one area is provided with a bacteria culture pool circulation pump 42, the outlet pipeline of the bacteria culture pool circulation pump 42 is divided into two pipelines, one pipeline is provided with a bacteria culture pool enhanced bioreactor 43 and refluxes to connect to the other area, and the other pipeline is connected to the aerobic zone 13 of the A2O pool 1, the interiors of the sludge return pipe enhanced bioreactor 33 and the bacteria culture pool enhanced bioreactor 43 are composed of multi-potential alloy materials, and expansion joints and pressure gauges are installed before and after the pipelines of the sludge return pipe enhanced bioreactor 33 and the bacteria culture pool enhanced bioreactor 43, and the volume of the bacteria culture pool 4 is 10-20% of the A2O pool 1.

[0018] A process for sludge reduction treatment using the above system comprises the following steps: 1) Start-up phase: After pre-treatment, 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; 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 the nutrient medium of the highly efficient aerobic composite engineered bacteria. Then the engineered bacteria are added to the bacteria cultivation pool 4. The flow promoter 41 is turned on. The power of the flow promoter 41 is not less than 5 w / m 3 Pool volume, domestication and cultivation of efficient composite engineering bacteria; 3) Operational stage: In order to better adapt to the biochemical system, the activated sludge rich in high-efficiency composite engineering bacteria is pumped into the aerobic zone 13 of the A2O tank 1 through the culture tank circulation pump 42 in 4-6 batches, and the sludge return pipe enhanced bioreactor 33 is started. The sludge containing high-efficiency composite engineering 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. In order to mitigate the impact on the biochemical system and allow the system to adapt better, the operation time of the sludge return pipe enhanced bioreactor increases in stages until it is put into operation at 100% load. The operation process of the sludge return pipe enhanced bioreactor 33 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, the discharge standard is met and the next stage is entered; the second stage: working 6 hours a day for three days, continuously observing the system effluent treatment indicators. If the effluent is normal, the next stage is entered; the third stage: working 12 hours a day for three days, continuously observing the system effluent treatment indicators. If the effluent is normal, the next stage is entered; the fourth stage: working 18 hours a day for three days, continuously observing the system effluent treatment indicators. If the effluent is normal, the next stage is entered; the fifth stage: working 24 hours a day for three days, continuously observing the system effluent treatment indicators. If the effluent is normal, the stable operation stage is entered.

[0019] Taking a sewage treatment plant with a sewage treatment capacity of 60,000 tons / day as an example, the sewage treatment capacity of the first phase is 30,000 tons / day, and no treatment is used as a blank group. The sewage treatment capacity of the second phase is 30,000 tons / day. After the sludge reduction treatment system based on the A2O process of the present invention is used for treatment, the sludge discharge is calculated after the system runs stably.

[0020] Table 1 Summary of average daily mud production under different conditions

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 as claimed in 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. A sludge reduction treatment system based on A2O process as claimed in 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 bacterial culture pool (4) to divide the bacterial culture pool (4) into two areas, each of the two areas is provided with a flow pusher (41), one area is provided with a bacterial culture pool circulation pump (42), an outlet pipeline of the bacterial culture pool circulation pump (42) is divided into two pipelines, one pipeline is provided with a bacterial culture pool enhanced bioreactor (43) and is refluxed to connect to the other area, and the other pipeline is connected to the aerobic zone (13) of the A2O pool (1).

5. A sludge reduction treatment system based on A2O process as claimed in 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). The interiors of the sludge return pipe enhanced bioreactor (33) and the bacterial culture tank enhanced bioreactor (43) are made of a 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 bacterial culture tank enhanced bioreactor (43).

6. A process for sludge reduction treatment using the system as claimed in claim 4, characterized in that: The steps include: 1) Start-up phase: After pre-treatment, the wastewater is transported to the A2O tank (1) for biochemical treatment. The effluent from the A2O tank (1) is transported to the secondary sedimentation tank (2) for sedimentation and stratification. The sludge from the secondary sedimentation tank (2) is transported to the sludge pump tank (3); 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 enhanced bioreactor (43) in the bacteria cultivation pool circulates the sludge. The treated sludge is used as a nutrient base for the highly efficient aerobic composite engineered bacteria. The engineered bacteria are then added to the bacteria cultivation pool (4), and the flow pusher (41) is turned on to acclimate and cultivate the highly efficient composite engineered bacteria. 3) Operational stage: In order 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), and 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).

7. A process for sludge reduction treatment as claimed in claim 6, characterized in that: The volume of the bacterial culture pool (4) is 10-20% of that of the A2O pool (1).

8. A process for sludge reduction treatment as claimed in claim 6, characterized in that: The operation process of the sludge return pipe enhanced bioreactor (33) 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, and PH. If the effluent is normal, it reaches the discharge standard and enters 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: Work 24 hours a day for three days and continuously observe the system's effluent treatment indicators. If the effluent is normal, enter the stable operation stage.

9. A process for sludge reduction treatment as claimed in claim 6, characterized in that: The power of the flow generator (41) is not less than 5 w / m 3 Pool volume.

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