CN112960774A

CN112960774A - Sewage treatment system

Info

Publication number: CN112960774A
Application number: CN202110289924.8A
Authority: CN
Inventors: 赵文勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2021-06-15

Abstract

The invention discloses a sewage treatment system, and belongs to the technical field of sewage treatment. The system comprises an adjusting tank, an anaerobic tank, a facultative tank, an aerobic tank and a sedimentation tank which are sequentially connected through a water conveying pipeline, wherein corresponding fillers are arranged in the anaerobic tank, the facultative tank and the aerobic tank; the top in anaerobism pond, facultative tank, good oxygen pond all is equipped with the sealing layer, and the entry of raceway is located the terminal top in forebay between anaerobism pond, facultative tank, the good oxygen pond, and the export is located the lower part of rear pool front end, and the bottom in anaerobism pond and facultative tank all is equipped with the recoil washing gas pipe net, and the bottom in good oxygen pond is equipped with the aeration pipe net, and the terminal top in anaerobism pond, facultative tank, good oxygen pond still is equipped with the outlet duct. The system can enable air to move transversely along with water flow, improves the utilization rate of oxygen, and is convenient for backwashing the anaerobic tank, the anoxic tank and the aerobic tank.

Description

Sewage treatment system

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a sewage treatment system.

Background

Along with the stricter and stricter environmental requirements, each large sewage treatment plant carries out upgrading and reconstruction, and the operating cost of sewage treatment is continuously increased. How to improve the sewage treatment effect and reduce the operation cost is a problem to be solved.

At present, 30% -40% of the operating cost of a sewage treatment plant is the power consumption operating cost of a fan, and the utilization rate of oxygen is only 15% -18%, so that huge waste of energy is caused. The reasons for the low oxygen utilization are as follows:

1. the inertia of air, which is the good and the good way. The sewage treatment plant is generally of an open structure, the depth of the tank is generally 5-6 meters, and the aeration device is arranged at the bottom of the tank. The air flow rate is 3 meters per second, that is, oxygen enters the atmosphere in 2 seconds, which is one of the reasons for the low oxygen utilization rate.

2. The aeration device of the existing sewage treatment plant generates a large amount of micro-bubbles which can not be broken and completely dissolved into water under the condition of no pressure, which is another reason causing low oxygen utilization rate.

In addition, the back washing of the biological filler in the biochemical pool also has the problem of unclean washing. Specifically, the anaerobic section and the aerobic section of the sewage treatment are both provided with biological fillers, and the biological fillers are suspended (suspended bed) and fixed (fixed bed). Anaerobic microorganisms and aerobic microorganisms can generate a large amount of sludge due to metabolism in the sewage treatment process, and the biological filler, especially the fixed bed biological filler, can be blocked, so that the sewage treatment cannot reach the standard. When air is used for backwashing, because the tank body is of an open structure, the backwashing air pressure is small and instantly enters the atmosphere, so that the biological filler cannot be washed cleanly, and the power consumption is large.

The subsurface flow constructed wetland is a main mode for advanced sewage treatment, and the problem of blockage of the biological filler of the fixed bed is also existed and is more serious. Because the subsurface flow constructed wetland is not provided with a fan and an aeration pipeline generally and has no back washing function, once sludge is blocked, the treatment cannot be carried out, and huge economic loss is caused.

The sewage treatment plant and the subsurface flow wetland have the problem that the operation in winter is not easy to reach the standard. The sewage treatment is difficult to reach the standard due to the low inlet water temperature and poor microbial activity of cold sewage treatment plants and subsurface flow wetlands in winter. The water temperature is required to be more than 15 ℃ for the microorganisms to grow actively. As the sewage treatment plant and the biochemical system of the subsurface flow wetland are generally in open structures, the fan can not fully utilize the heat provided by the aeration system for the sewage, and the system is one of the main reasons that the sewage treatment in winter is difficult to reach the standard.

Disclosure of Invention

The invention aims to overcome the defects and provides a sewage treatment system which can enable air to move transversely along with water flow, improve the utilization rate of oxygen and facilitate back flushing of an anaerobic pool, an anoxic pool and an aerobic pool.

In order to achieve the purpose, the invention adopts the technical scheme that:

a sewage treatment system comprises a regulating tank, an anaerobic tank, a facultative tank, an aerobic tank and a sedimentation tank which are sequentially connected through a water conveying pipeline, wherein corresponding fillers are arranged in the anaerobic tank, the facultative tank and the aerobic tank; the top in anaerobism pond, facultative tank, good oxygen pond all is equipped with the sealing layer, and the entry of raceway is located the terminal top in forebay between anaerobism pond, facultative tank, the good oxygen pond, and the export is located the lower part of rear pool front end, and the bottom in anaerobism pond and facultative tank all is equipped with the recoil washing gas pipe net, and the bottom in good oxygen pond is equipped with the aeration pipe net, and the terminal top in anaerobism pond, facultative tank, good oxygen pond still is equipped with the outlet duct.

Furthermore, filter screens are arranged at the inlets of the water conveying pipelines among the anaerobic tank, the facultative tank and the aerobic tank.

Furthermore, the back washing gas pipe network and the aeration pipe network are respectively connected with the same back washing fan through respective air supply pipelines, and each air supply pipeline is provided with a valve.

Furthermore, the aeration pipe network is also connected with an aeration fan through an air supply pipeline, and a valve is arranged on the air supply pipeline.

Furthermore, the air outlet pipe on each of the anaerobic tank, the facultative tank and the aerobic tank is positioned in front of the water conveying pipeline at the tail end of the tank.

Furthermore, a heat-insulating layer is arranged on the sealing layer.

Further, the heat-insulating layer is a cement board or a plastic film covered with soil.

Furthermore, the inlet of the water conveying pipeline between the regulating tank and the anaerobic tank is positioned in the middle of the regulating tank, and the outlet is positioned at the lower part of the anaerobic tank.

Compared with the prior art, the invention has the beneficial effects that:

1. the sealing layers are arranged at the upper top ends of the anaerobic tank, the anoxic tank and the aerobic tank of the sewage treatment system, so that air can transversely move along with water flow.

2. The sealing layer is arranged at the top of the aerobic tank of the system, so that the oxygen can be prevented from escaping rapidly, the utilization efficiency of the oxygen is improved, and the energy consumption of the aeration system is reduced.

3. This sewage treatment system is equipped with the backwash fan, when anaerobism pond, oxygen deficiency pond, good oxygen pond mud too influences play water quality of water, opens reserve backwash fan for mud and water in anaerobism pond, oxygen deficiency pond, the good oxygen pond expand rapidly, follow rivers and get into the sedimentation tank fast, and each biochemical system's mud obtains thoroughly cleaing away.

Drawings

FIG. 1 is a schematic structural diagram of a sewage treatment system according to an embodiment of the present invention.

Fig. 2 is a top view of fig. 1.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.

As shown in fig. 1 and 2, a sewage treatment system comprises an adjusting tank 1, an anaerobic tank 2, a facultative tank 3, an aerobic tank 4 and a sedimentation tank 5 which are connected in sequence through water pipelines, wherein corresponding fillers are arranged in the anaerobic tank 2, the facultative tank 3 and the aerobic tank 4; the top in anaerobism pond, facultative tank, good oxygen pond all is equipped with sealing layer 7, and the entry of

hydraulic pipe line

9, 10, 11 is located the terminal top in forebay between anaerobism pond, facultative tank, the good oxygen pond, and the export is located the lower part of rear pool front end, and the bottom in anaerobism pond 2 and facultative tank 3 all is equipped with recoil washing

gas pipe network

12, 13, and the bottom in good oxygen pond 4 is equipped with aeration pipe network 14, and the top at the end in anaerobism pond, facultative tank, good oxygen pond still is equipped with outlet duct 8. The gas outlet pipes at the tail ends of the anaerobic tank and the anoxic tank can discharge nitrogen and other useless gases.

Furthermore, filter screens 15 are arranged at the inlets of the water conveying pipelines among the anaerobic tank, the facultative tank and the aerobic tank.

Further, the back washing gas pipe network and the aeration pipe network are respectively connected with the same back washing fan through respective air supply pipelines 16, and each air supply pipeline is provided with a valve. The aeration pipe network also serves as a back flushing gas pipe network of the aerobic tank.

Furthermore, the sealing layer also has a heat preservation function. The sealing layer has the function of gas isolation, and the gas isolation material can be selected from geomembranes or composite geomembranes and the like. The air-proof material is also provided with a compaction layer, the compaction layer can be selected from broken stones, sand soil, cement boards and the like, and the compaction layer has two functions, one is to compact the air-proof material to prevent air from penetrating through the air-proof material to enter the atmosphere, and the other is to be used for heat preservation in winter. The sealing layer ensures that each sewage treatment system is a closed space or a part of closed space, so that air cannot pass through the water surface to enter the atmosphere, and the flowing direction of the air is changed to flow along with the water flow in a transverse direction.

Further, the inlet of the water conveying pipeline 6 between the adjusting tank 1 and the anaerobic tank 2 is positioned in the middle of the adjusting tank, and the outlet is positioned at the lower part of the anaerobic tank.

In the sewage treatment system, a large amount of micro bubbles generated by the aeration device are broken and melted into water under the action of certain pressure and cutting of biological fillers, so that the utilization rate of oxygen reaches more than 50 percent, and the power consumption and the operating cost are greatly reduced. An exhaust pipeline is arranged at the tail end of the aerobic tank, holes are formed in the exhaust pipeline from bottom to top, and the exhaust pipeline is exposed out of the ground and used for discharging useless gas.

The sewage treatment system can change the air flow direction, so that the air flow enters the atmosphere from the longitudinal direction and changes into the air flow moving along with the water flow in the transverse direction. In addition, the micro-bubbles generated by the fan through the aeration system are broken and merged into water under a certain pressure, so that the content of dissolved oxygen in the water is greatly increased, the utilization rate of oxygen is greatly improved to more than 50%, and the power consumption of the fan is reduced.

In addition, in the sewage treatment system, the water outlets of the biochemical systems are arranged at the top plate at the tail end, and the bottom plate of the water outlet pipeline is provided with a filter screen, so that the floating biological filler can be prevented from flowing away along with water flow.

When the system works, incoming water firstly enters a regulating tank 1 and then automatically flows into an anaerobic tank 2 through a pipeline 6, a flushing gas pipe network 12 is arranged at the bottom of the anaerobic tank, the outgoing water automatically flows into a facultative tank 3 through a pipeline 9, a filter screen 15 is arranged at the inlet end of the pipeline, and a backflushing gas pipe network 13 is arranged at the bottom of the facultative tank; the effluent automatically flows into an aerobic tank 4 through a pipeline 10, a filter screen 15 is arranged at the inlet end of the pipeline, and an aeration pipe network 14 is arranged at the bottom of the aerobic tank; meanwhile, the aeration pipe network 14 is also used as a back flushing pipe network; the effluent flows into the sedimentation tank 5 through a pipe 11. The anaerobic tank 2, the facultative tank 3 and the aerobic tank 4 are respectively provided with an exhaust pipe 8 at the top and exhaust insoluble water gas such as nitrogen.

When the excess sludge of each biochemical system influences the effluent water quality, a backwashing fan is started, the anaerobic tank 2, the facultative tank 3 and the aerobic tank 4 are respectively subjected to gas backwashing through a pipeline 16, and the backwashed sludge finally flows into the sedimentation tank 5 along with water flow to perform mud-water separation.

Claims

1. A sewage treatment system comprises a regulating tank, an anaerobic tank, a facultative tank, an aerobic tank and a sedimentation tank which are sequentially connected through a water conveying pipeline, wherein corresponding fillers are arranged in the anaerobic tank, the facultative tank and the aerobic tank; the anaerobic pool, the facultative tank and the aerobic pool are all provided with sealing layers, the inlet of a water conveying pipeline between the anaerobic pool, the facultative tank and the aerobic pool is positioned at the top of the tail end of the front pool, the outlet of the water conveying pipeline is positioned at the lower part of the front end of the rear pool, the bottoms of the anaerobic pool and the facultative tank are all provided with a back flushing pipe network, the bottom of the aerobic pool is provided with an aeration pipe network, and the top of the tail end of the anaerobic pool, the facultative tank and the aerobic pool is also provided with an air outlet pipe.

2. The sewage treatment system of claim 1, wherein a filter screen is disposed at the inlet of the water conveying pipeline among the anaerobic tank, the facultative tank and the aerobic tank.

3. The sewage treatment system of claim 1, wherein the backwash gas pipe network and the aeration pipe network are respectively connected with the same backwash fan through respective air supply pipelines, and each air supply pipeline is provided with a valve.

4. The wastewater treatment system according to claim 1, wherein the aeration pipe network is further connected to an aeration fan through an air supply line, and the air supply line is provided with a valve.

5. The sewage treatment system of claim 1, wherein the air outlet pipe of each of the anaerobic tank, the facultative tank and the aerobic tank is positioned in front of the water conveying pipeline at the tail end of the tank.

6. The wastewater treatment system according to claim 1, wherein the sealing layer is further provided with an insulating layer.

7. The wastewater treatment system according to claim 6, wherein the insulation layer is a cement board or a plastic film covered with soil.

8. The wastewater treatment system according to claim 1, wherein the inlet of the water pipeline between the regulating reservoir and the anaerobic reservoir is located in the middle of the regulating reservoir, and the outlet is located in the lower part of the anaerobic reservoir.