A method for modifying an integrated rural sewage treatment device suitable for a sedimentation effluent mode

Abstract

This invention discloses a method for modifying an integrated rural wastewater treatment equipment suitable for sedimentation effluent treatment, relating to the field of wastewater treatment technology. Given the significant seasonal variations in water quality and quantity in rural wastewater, current methods typically employ anaerobic / anoxic / aerobic suspended activated sludge operation. This approach cannot maintain sludge content, concentration, and activity under conditions of long-term, large fluctuations in influent water quality and quantity. Based on the seasonal characteristics of rural wastewater, this invention utilizes an anaerobic / anoxic / aerobic activated sludge operation mode under high-load influent conditions and an anaerobic + microaerobic sludge bed operation mode under low-load influent conditions. By flexibly implementing a load-regulating rural wastewater operation mode according to water quality and quantity, this achieves efficient treatment of rural wastewater.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a method for modifying an integrated rural wastewater treatment equipment suitable for sedimentation effluent treatment. Background Technology

[0002] Most rural wastewater treatment plants use the per capita wastewater discharge method for design scale estimation. However, due to incomplete pipeline construction and small pipeline size, water quality and quantity fluctuate greatly, ultimately leading to long-term low-load and occasional full-load operation of rural wastewater treatment facilities. Currently, the most commonly used process is anaerobic / anoxic / aerobic / sedimentation. Benefiting from a sufficient oxygen supply, this process results in high extracellular polymer content in activated sludge, rapid bacterial growth, and high activity. However, rural wastewater exhibits significant seasonal fluctuations in both volume and quality. During low-load operation with low influent volume and low organic matter concentration, equipment suffers from poor aeration regulation, while high-load operation leads to high energy consumption and difficulty in maintaining sludge activity. Therefore, how to maintain sludge content, concentration, and activity under low-load influent conditions is a pressing issue for variable-load operation of rural wastewater treatment plants. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a method for modifying an integrated rural sewage treatment equipment suitable for sedimentation effluent treatment.

[0004] This invention is achieved using the following techniques:

[0005] This invention provides a method for modifying an integrated rural sewage treatment equipment suitable for sedimentation effluent, including an integrated rural sewage treatment equipment, and a cascading reoxygenation return bypass added next to the integrated rural sewage treatment equipment to achieve switching of sludge bed operation mode under low load.

[0006] Furthermore, the cascade reoxygenation return bypass includes a cascade reoxygenation well, a cascade inlet pipe, a reoxygenated water return pipe, and a bypass outlet pipe.

[0007] Furthermore, the cascading reoxygenation well includes a cascading device, a reoxygenated water return pump, and a level regulating pump. The cascading inlet pipe connects to the cascading device in the cascading reoxygenation well from the integrated rural sewage treatment equipment, and the reoxygenated water return pipe connects to the integrated rural sewage treatment equipment from the reoxygenated water return pump in the cascading reoxygenation well; the bypass outlet pipe connects to the sedimentation tank from the level regulating pump.

[0008] Furthermore, the drop height and flow rate of the drop device are adjustable, and the height of the outlet weir of the drop device should be 0.3m below the full liquid level of the integrated rural sewage treatment equipment.

[0009] Furthermore, the liquid level of the drop reoxygenation well is controlled by a liquid level regulating pump, and the liquid level should be 0.5m lower than the height of the outlet weir of the drop device to ensure sufficient drop height.

[0010] Furthermore, the reoxygenated water return pipe returns the water to the bottom of the integrated rural sewage treatment equipment.

[0011] Furthermore, one end of the drop inlet pipe is located 0.2m below the water level in the aerobic tank, and the other end is connected to the drop device.

[0012] The anaerobic + microaerobic sludge bed operation mode in this invention has advantages such as high biological reactivity, because the microorganisms in the sludge bed system attach to the bed surface to form a biofilm, and the static bed system retains as much sludge as possible. It can adjust its own metabolic activities according to changes in the external environment and use suitable habitat conditions to promote the growth and activity of microorganisms. Therefore, it has advantages such as high treatment capacity, strong resistance to shock loads with large fluctuations in influent load, low chemical dosage, and low operating cost. Moreover, compared with the long-term high aeration and low load state, the microaerobic low load operation keeps the sludge in the endogenous respiration stage for a long time, and the self-decay rate is slowed down.

[0013] Therefore, based on the characteristics of influent water quality changes, during periods of high influent load, a suspended sludge operation mode using an anaerobic / anoxic / aerobic process is adopted for rural sewage treatment; during periods of low influent load, an anaerobic + microaerobic sludge bed operation mode is adopted. However, the anaerobic / anoxic / aerobic / sedimentation process is not suitable for the anaerobic + microaerobic sludge bed operation mode. Therefore, this invention structurally modifies the original anaerobic / anoxic / aerobic / sedimentation process to achieve a load-regulated rural sewage treatment operation mode.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This invention provides a method for modifying an integrated rural wastewater treatment equipment with sedimentation effluent. By modifying the original anaerobic / anoxic / aerobic / sedimentation process, it has good compatibility with existing integrated rural wastewater treatment equipment. The modification method is simple and easy to operate, does not increase the additional process reconstruction cost, and reduces investment and modification costs.

[0016] This invention applies the cascading aeration and oxygen supply method to integrated rural sewage treatment, solving the problems of poor flexibility and accuracy in adjusting aeration pipe valves in previous small-scale integrated sewage treatment equipment.

[0017] After modification by this invention, the integrated rural sewage treatment system can achieve variable load operation.

[0018] Instruction manual illustrations

[0019] Figure 1This is a schematic diagram of the device in the present invention.

[0020] In the diagram: 1-Integrated rural sewage treatment equipment, 2-Cascade reoxygenation return bypass, 3-Cascade reoxygenation well, 4-Cascade inlet pipe, 5-Reoxygenated water return pipe, 6-Bypass outlet pipe, 7-Cascade device, 8-Reoxygenated water return pump, 9-Level regulating pump. Detailed Implementation

[0021] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0022] The original integrated rural wastewater treatment process used an anaerobic / anoxic / aerobic / sedimentation process, with anaerobic, anoxic, and aerobic volumes of 20m³ each. 3 20m 3 60m 3 The aerobic tank is equipped with microporous aerators at the bottom. The original integrated rural wastewater treatment equipment was modified by adding a cascading reoxygenation well next to it. A cascading inlet pipe was installed in the aerobic tank, with its top 0.2m below the water level. The other end of the pipe connected to a cascading device located in the cascading reoxygenation well. Water from the aerobic tank flows through the inlet pipe into the cascading device in the reoxygenation well. The cascading device is 1m high with a unit flow rate of 3L / s. The outlet weir of the cascading device is 0.3m below the full-level height of the integrated rural wastewater treatment equipment. The water undergoes reoxygenation through the cascading system. A reoxygenated water return pump is installed at the bottom of the cascading reoxygenation well, returning the reoxygenated water from the well to the bottom of the integrated rural wastewater treatment equipment. The dissolved oxygen in the integrated rural wastewater treatment equipment is controlled by regulating the return flow rate through the reoxygenated water return pump. A level regulating pump is installed in the drop reoxygenation well to regulate the water level in the drop reoxygenation well. The water to be discharged from the drop reoxygenation well is discharged to the sedimentation tank through the bypass outlet pipe in the drop reoxygenation well.

[0023] The scope of protection claimed by this invention is not limited to the specific embodiments described above. Moreover, for those skilled in the art, this invention can have various modifications and alterations. Any modifications, improvements, and equivalent substitutions made within the concept and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for modifying an integrated rural wastewater treatment equipment suitable for sedimentation-based effluent treatment, characterized in that: The system includes an integrated rural sewage treatment equipment (1), with a cascading reoxygenation return bypass (2) added next to the integrated rural sewage treatment equipment (1); the cascading reoxygenation return bypass (2) includes a cascading reoxygenation well (3), a cascading inlet pipe (4), a reoxygenated water return pipe (5), and a bypass outlet pipe (6); the cascading reoxygenation well (3) includes a cascading device (7), a reoxygenated water return pump (8), and a level regulating pump (9); the cascading inlet pipe (4) is connected to the cascading reoxygenation well from 0.2m below the aerobic tank water level of the integrated rural sewage treatment equipment (1). (3) The drop device (7); the reoxygenated water return pipe (5) is connected from the reoxygenated water return pump (8) in the drop reoxygenation well (3) to the bottom of the integrated rural sewage treatment equipment (1); the bypass outlet pipe (6) is connected from the level regulating pump (9) to the sedimentation tank; the outlet weir height of the drop device (7) is 0.3m below the full liquid level height of the integrated rural sewage treatment equipment (1); the liquid level of the drop reoxygenation well (3) is controlled by the level regulating pump (9), and the liquid level height is 0.5m below the outlet weir height of the drop device (7); Under low-load influent conditions, the integrated rural sewage treatment equipment (1) is switched from the suspended sludge operation mode of anaerobic / anoxic / aerobic / sedimentation process to the anaerobic + micro-aerobic sludge bed operation mode.

2. The method for modifying the integrated rural sewage treatment equipment suitable for the sedimentation water outlet mode according to claim 1, characterized in that: The drop height and drop unit width flow rate of the drop device (7) are adjustable.

3. The method for modifying the integrated rural sewage treatment device suitable for the sedimentation water outlet mode according to claim 2, characterized in that: The drop height of the drop device (7) is 1m, and the drop unit flow rate is 3L / s.

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