External gas stripping reflux device for integrated equipment

Abstract

The utility model relates to a gas stripping reflux device for external integrated equipment, which relates to the technical field of sewage treatment and mainly comprises a gas supply power system, a sedimentation tank concentrated sludge collecting system and a gas stripping conveying system. During normal work, concentrated sludge of the secondary sedimentation tank is conveyed to the anoxic tank through gas stripping under the lifting action of the gas supply power system; and when the secondary sedimentation tank needs to be purged, the air supply power system backwashes the sediment collecting pipe of the sedimentation tank by switching the valve. The device has the advantages of continuous and stable gas stripping reflux, no water burst, no occupation of space in the tank, simplicity in operation and maintenance and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to an air-lift reflux device for an external integrated device. Background Technique

[0002] In the process of sewage treatment, in order to achieve efficient denitrification, sludge reflux and nitrification liquid reflux are usually required. The traditional pump reflux method has high energy consumption, high failure rate and situations where the usage requirements cannot be met. For integrated devices with small flow reflux, it is difficult to select pumps, and it is hard to choose a suitable type of reflux pump; for sewage with high hardness, the service life of the mechanical seal of the reflux pump is low, and there is often a phenomenon of mechanical seal leakage, which requires frequent replacement of the mechanical seal, and the maintenance and operation are costly, time-consuming and laborious; for the aerobic granular sludge process, the reflux pump has a shearing effect on flocculent sludge, which makes it more difficult to form sludge granulation, and the granules are fine.

[0003] Air-lift reflux has the characteristics of simple structure, wide adjustment range, energy conservation and easy operation. However, traditional air-lift devices are mostly arranged in the pool, occupying the space of the pool body, which hinders the lifting, inspection and maintenance of equipment in the pool body; secondly, the returned water contains a large amount of gas, resulting in water gushing, and the effluent is not continuous. When the return flow is large or the return flow reaches the anaerobic unit, the returned water with high dissolved oxygen content causes the phosphorus-removing microorganisms to be unable to efficiently release phosphorus, and the phosphorus-removing efficiency of the biochemical system is affected; in addition, the reflux sludge is concentrated by gravity and is relatively viscous. After some openings are blocked, hydraulic short-circuiting may occur, and sludge accumulates in some areas for a long time, causing anaerobic floating and deteriorating the effluent quality.

[0004] Patent CN 216687618 U discloses a nitrification liquid air-lift reflux device. The strip-shaped holes increase the channel area of the lifting pipe, but it can only collect the nitrification liquid around the lifting pipe, with a narrow collection range and poor applicability to sludge hoppers with a large bottom area. In addition, there is no air-water separation measure, and the returned water contains a large amount of gas, resulting in water gushing.

[0005] Patent CN 218151703 U discloses an H-shaped air-lift device for containerized sewage treatment. The sludge collection range is increased, but the device floats above the sedimentation tank. The reflux sludge has not been concentrated by gravity, the lifting and reflux efficiency is low, and the concentrated sludge at the bottom is prone to caking and floating, resulting in deterioration of the effluent quality. Summary of the Utility Model

[0006] The purpose of the utility model is to provide an air-lift reflux sewage device for an external integrated device to solve the problems of unstable effluent caused by air-lift water gushing, excessive dissolved oxygen carried, and occupying the internal space of the sedimentation tank.

[0007] The utility model is realized by the following scheme:

[0008] An air-lift reflux device for an external integrated device mainly consists of three parts: a gas supply power system, a concentrated sludge collection system for the sedimentation tank, and an air-lift conveying system, which are connected by a tee; the gas supply power system includes an air compressor, an electric valve, a manual gas supply valve, a gas flow meter, a gas vent valve, a reducer for the air-lift conveying pipe, and a check valve. The electric valve, the manual gas supply valve, the gas flow meter, the reducer for the air-lift conveying pipe, and the check valve are connected in sequence along the gas flow direction. The gas vent valve, the electric valve, and the manual gas supply valve are connected by a tee; the concentrated sludge collection system for the sedimentation tank includes a sedimentation tank mud hopper, a sedimentation tank bottom sludge collection pipe, an inner connecting pipe in the sedimentation tank, double-sided flanges, an outer connecting pipe outside the sedimentation tank, a sludge discharge valve, and a reducer for the concentrated sludge collection pipe of the sedimentation tank. The sedimentation tank bottom sludge collection pipe, the inner connecting pipe in the sedimentation tank, the double-sided flanges, the outer connecting pipe outside the sedimentation tank, the sludge discharge valve, and the reducer for the concentrated sludge collection pipe of the sedimentation tank are connected in sequence; the air-lift conveying system includes an external upflow pipe, a manual valve for the external upflow pipe, a reducer for the air-lift conveying pipe, an automatic exhaust valve, a horizontal conveying pipe, an upper vertical outflow pipe, and a lower vertical outflow pipe. The external upflow pipe, the automatic exhaust valve, and the horizontal conveying pipe are connected by a tee, and the horizontal conveying pipe, the upper vertical outflow pipe, and the lower vertical outflow pipe are connected by a tee.

[0009] Further, the sedimentation tank bottom sludge collection pipe is in a "day" shape and is mainly composed of elbows, tees, and Φ50 UPVC pipes spliced together. Uniform holes are opened on both sides of the wall of the sedimentation tank bottom sludge collection pipe. The number of holes on each side of the sedimentation tank bottom sludge collection pipe is more than 2. The opening direction is 45° obliquely downward, and the aperture size is 10 - 15 mm. The inner connecting pipe in the sedimentation tank and the sedimentation tank bottom sludge collection pipe are connected by a 45° elbow.

[0010] Further, the sedimentation tank mud hopper has an inclination angle of 45° - 65°, and double-sided flanges are installed on the side wall.

[0011] Further, the size of the reducer for the gas supply power pipe is Φ63×Φ25; the size of the reducer for the concentrated sludge collection pipe of the sedimentation tank is Φ63×Φ50; the size of the reducer for the air-lift conveying pipe is Φ63×Φ32.

[0012] Further, the upper vertical outflow pipe is 20 - 30 cm above the liquid level; the lower vertical outflow pipe extends into the tank and is 20 - 30 cm away from the tank bottom.

[0013] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are:

[0014] (1) The reflux pump is omitted. Only a branch pipe needs to be connected from the existing fan, without additional energy consumption, and the failure rate is almost zero, greatly saving the operation cost;

[0015] (2) The present utility model is arranged outside the pool body, does not occupy the space of the sedimentation tank, and does not affect the use function and maintenance requirements of the original sedimentation tank;

[0016] (3) The present utility model has a wide flow regulation range. Only by simply adjusting the air supply valve, the demand for an ultra-low return flow can be met;

[0017] (4) The present utility model solves the problem of air-lift water gushing. The lifting air and the lifted muddy water mixture are effectively separated, the dissolved oxygen content carried is low, the return liquid is continuous and stable, and the influence on the operation of the previous process is small;

[0018] (5) The vertical outlet pipe of the present utility model extends deep into the bottom of the pool body, and the gravity flow sinks, having a hydraulic stirring function, which is beneficial to mass transfer in the biochemical reaction process;

[0019] (6) The present utility model comprehensively considers the problem of hydraulic short-circuiting caused by the blockage of the sludge collection pipe at the bottom of the sedimentation tank. By switching the valve, the sedimentation tank can be purged, effectively avoiding the sludge floating caused by the long-term accumulation of mud in the short-circuit area at the bottom of the sedimentation tank, which is beneficial to maintaining good effluent quality.

[0020] During normal operation, the concentrated sludge in the secondary sedimentation tank is lifted by the air supply power system and transported to the anoxic tank through air-lift; when the secondary sedimentation tank needs to be purged, the air supply power system backwashes the sediment collection pipe at the bottom of the sedimentation tank by switching the valve. The present utility model has the advantages of continuous and stable air-lift return liquid, effectively solving the problem of water gushing, not occupying the space inside the pool, and being simple in maintenance. Brief Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the present utility model.

[0022] Figure 2 is the present utility model Figure 1 The enlarged structural schematic diagram of part A in.

[0023] In the figure: 1, air compressor; 2, electric valve; 3, air supply manual valve; 4, gas flowmeter; 5, gas vent valve; 6, check valve; 7, sludge discharge valve; 8, connecting pipe outside the sedimentation tank; 9, double-sided flange; 10, internal and external thread joint; 11, automatic exhaust valve; 12, exhaust port of the exhaust valve; 13, horizontal conveying pipe; 14, upper vertical outlet pipe; 15, lower vertical outlet pipe; 16, anoxic tank; 17, aerobic tank; 18, sedimentation tank; 19, sedimentation tank mud hopper; 20, air supply power pipe reducer; 21, sediment collection pipe at the bottom of the sedimentation tank; 22, sedimentation tank concentrated sludge collection pipe reducer; 23, air-lift conveying pipe reducer; 24, external upflow pipe; 25, external upflow pipe manual valve; 26, connecting pipe inside the sedimentation tank. Specific Embodiments

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model.

[0025] Please refer to Figure 1-2 , the present utility model provides a technical solution: an air-lift reflux device for an external integrated device, mainly composed of a gas supply power system, a sedimentation tank concentrated sludge collection system, and an air-lift transportation system, connected by a tee 27. The gas supply power system includes an air compressor 1, an electric valve 2, a gas supply manual valve 3, a gas flow meter 4, a gas vent valve 5, an air power pipe reducer 20, and a check valve 6. Among them, the electric valve 2, the gas supply manual valve 3, the gas flow meter 4, the air power pipe reducer 20, and the check valve 6 are connected in sequence along the gas flow direction, and the gas vent valve 5, the electric valve 2, and the gas supply manual valve 3 are connected by a tee; the sedimentation tank concentrated sludge collection system includes a sedimentation tank mud hopper 19, a sedimentation tank bottom sludge collection pipe 21, a sedimentation tank internal connection pipe 26, double-sided flanges 9, a sedimentation tank external connection pipe 8, a sludge discharge valve 7, and a sedimentation tank concentrated sludge collection pipe reducer 22. Among them, the sedimentation tank bottom sludge collection pipe 21, the sedimentation tank internal connection pipe 26, the double-sided flanges 9, the sedimentation tank external connection pipe 8, the sludge discharge valve 7, and the sedimentation tank concentrated sludge collection pipe reducer 22 are connected in sequence; the air-lift transportation system includes an external upflow pipe 24, an external upflow pipe manual valve 25, an air-lift transportation pipe reducer 23, an automatic exhaust valve 11, a horizontal transportation pipe 13, an upper vertical outflow pipe 14, and a lower vertical outflow pipe 15. The external upflow pipe 24, the automatic exhaust valve 11, and the horizontal transportation pipe 12 are connected by a tee, and the horizontal transportation pipe 13, the upper vertical outflow pipe 14, and the lower vertical outflow pipe 15 are connected by a tee.

[0026] The sedimentation tank bottom sludge collection pipe 21 is in the shape of a "day", and is spliced by elbows, tees, and Φ50 UPVC pipes. Uniform holes are opened on both sides of the pipe wall of the sedimentation tank bottom sludge collection pipe 21. The number of holes on each side of the sedimentation tank bottom sludge collection pipe 21 is more than 2, and the hole opening direction is 45° obliquely downward ( Figure 2 a in

[0027] is the inner hole, and b is the outer hole), the hole diameter is 10 - 15 mm, and the sedimentation tank internal connection pipe 26 and the sedimentation tank bottom sludge collection pipe 21 are connected by a 45° elbow.

[0028] The air supply power pipe reducer 20 is sized Φ63×Φ25; the sedimentation tank concentrated sludge collection pipe reducer 22 is sized Φ63×Φ50; the air-lift transportation pipe reducer 23 is sized Φ63×Φ32.

[0029] The upper vertical outflow pipe 14 is 20 - 30 cm above the liquid level; the lower vertical outflow pipe 15 extends into the pool and is 20 - 30 cm from the bottom of the pool.

[0030] Although the practical examples of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these examples without departing from the principles and spirit of the present utility model. All other embodiments obtained without creative efforts fall within the scope of protection of the present utility model.

Claims

1. A gas stripping reflux device for an external integrated equipment, characterized in that: It consists of three parts: a gas supply power system, a concentrated sludge collection system for the sedimentation tank, and a gas-lift conveying system, which are connected by a tee. The gas supply power system includes an air compressor, an electric valve, a manual gas supply valve, a gas flow meter, a gas vent valve, a reducer for the gas-lift conveying pipe, and a check valve. Among them, the electric valve, the manual gas supply valve, the gas flow meter, the reducer for the gas-lift conveying pipe, and the check valve are connected in sequence along the gas flow direction, and the gas vent valve, the electric valve, and the manual gas supply valve are connected by a tee. The concentrated sludge collection system for the sedimentation tank includes a sedimentation tank mud hopper, a sedimentation tank bottom sludge collection pipe, an internal connection pipe in the sedimentation tank, double-sided flanges, an external connection pipe outside the sedimentation tank, a sludge discharge valve, and a reducer for the concentrated sludge collection pipe of the sedimentation tank. Among them, the sedimentation tank bottom sludge collection pipe, the internal connection pipe in the sedimentation tank, the double-sided flanges, the external connection pipe outside the sedimentation tank, the sludge discharge valve, and the reducer for the concentrated sludge collection pipe of the sedimentation tank are connected in sequence. The gas-lift conveying system includes an external upflow pipe, a manual valve for the external upflow pipe, a reducer for the gas-lift conveying pipe, an automatic exhaust valve, a horizontal conveying pipe, an upper vertical outflow pipe, and a lower vertical outflow pipe. Among them, the external upflow pipe, the automatic exhaust valve, and the horizontal conveying pipe are connected by a tee, and the horizontal conveying pipe, the upper vertical outflow pipe, and the lower vertical outflow pipe are connected by a tee.

2. The gas stripping reflux device for external integrated equipment according to claim 1, characterized in that: The sedimentation tank bottom sludge collection pipe is in the shape of a "day" character and is mainly composed of elbows, tees, and Φ50 UPVC pipes spliced together. Uniform holes are opened on both sides of the pipe wall of the sedimentation tank bottom sludge collection pipe. The number of holes on each side of the sedimentation tank bottom sludge collection pipe is more than 2, the hole opening direction is 45° obliquely downward, and the hole diameter is 10 - 15 mm. The internal connection pipe in the sedimentation tank and the sedimentation tank bottom sludge collection pipe are connected by a 45° elbow.

3. The gas stripping reflux device for external integrated equipment according to claim 1, characterized in that: The sedimentation tank mud hopper has an inclination angle of 45° - 65°, and double-sided flanges are installed on the side wall.

4. The gas stripping reflux device for external integrated equipment according to claim 1, characterized in that: The size of the reducer for the concentrated sludge collection pipe of the sedimentation tank is Φ63×Φ50; the size of the reducer for the gas-lift conveying pipe is Φ63×Φ32.

5. The gas stripping reflux device for external integrated equipment according to claim 1, characterized in that: The upper vertical outflow pipe is 20 - 30 cm above the liquid level; the lower vertical outflow pipe extends into the tank and is 20 - 30 cm away from the tank bottom.

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