A secondary sedimentation tank water distribution well structure for preventing sludge deposition

Abstract

A secondary sedimentation tank water distribution well structure for preventing sludge deposition comprises a central-inlet and peripheral-outlet water distribution well and a peripheral-inlet and peripheral-outlet rectangular secondary sedimentation tank connected thereto through a water distribution pipe, and also comprises an aeration system arranged in the water distribution well and the rectangular secondary sedimentation tank through a pre-buried aeration pipe; the aeration system uses an air delivery device to convey compressed air from the pre-buried aeration pipe into the water distribution well and the rectangular secondary sedimentation tank to play an aeration role; the pre-buried aeration pipe is respectively buried in the mud collection channel of the water distribution well and in the rectangular secondary sedimentation tank, and the pneumatic device provides industrial air for aeration of the mud collection channel and nitrogen oxide removal air for the rectangular secondary sedimentation tank through an air compressor. The present invention greatly reduces land occupation, reduces engineering investment, reduces unevenness of daily water distribution, reflux sludge, etc., and at the same time, uniformly treats the sludge in the secondary sedimentation tank to reduce the complexity of operation and management, and can reduce the floating of sludge in the secondary sedimentation tank by reducing denitrification reaction.

Description

Technical Field

[0001] The invention relates to a secondary sedimentation tank water distribution well structure for preventing sludge deposition. Background Art

[0002] In recent years, due to the higher environmental protection standards for sewage treatment plant effluent indicators and the increasingly strict land control of sewage treatment plants, it is difficult to meet the current land control requirements and energy conservation requirements by relying on the previous water distribution methods. In particular, large and medium-sized sewage treatment plants require several groups of reaction tanks and sedimentation tanks. If the return flow into the biological reaction system is unevenly distributed with mud and the secondary sedimentation tank is unevenly distributed with water, it is very unfavorable to the biological reaction. Therefore, water should be distributed uniformly to reduce operating costs and energy consumption, and reduce land occupation.

[0003] The existing water distribution well structure is mostly a relay device set up between the secondary sedimentation tank and the biological pool, which has limited water distribution effect. At the same time, long-term water distribution causes sludge accumulation in the water distribution well, causing blockage. At the same time, since the return flow of the rectangular secondary sedimentation tank is relatively small, long-term poor return flow can easily cause the sludge at the bottom of the secondary sedimentation tank to denitrify nitrate due to lack of oxygen, producing ammonia and causing the sludge to float. The aeration of industrial gas contains nitrogen oxides, which aggravates this reaction. Summary of the invention

[0004] The purpose of the present invention is to provide a secondary sedimentation tank water distribution well structure for preventing sludge deposition in order to solve the above problems.

[0005] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical scheme: a secondary sedimentation tank water distribution well structure for preventing sludge deposition, which includes a central-inlet and peripheral-outlet water distribution well and a peripheral-inlet and peripheral-outlet rectangular secondary sedimentation tank connected to the water distribution well through a water distribution pipe, and also includes an aeration system arranged in the water distribution well and the rectangular secondary sedimentation tank through a pre-buried aeration pipe; the aeration system uses an air delivery device to convey compressed air from the pre-buried aeration pipe into the water distribution well and the rectangular secondary sedimentation tank to play an aeration role; the pre-buried aeration pipe is respectively buried in the mud collection channel of the water distribution well and in the rectangular secondary sedimentation tank, and the pneumatic device provides industrial air for aeration of the mud collection channel and nitrogen oxide removal air for the rectangular secondary sedimentation tank through an air compressor.

[0006] Furthermore, the water distribution well includes a central water inlet channel with a flow stabilizer in the middle, an outlet channel that is not connected to each other and is arranged around the central water inlet channel, and a mud collecting channel that is arranged around the outlet channel; the central water inlet channel is connected to the outlet of the sewage in the biological pool through an inlet pipe at the bottom, and is connected to the mud suction device through a mud discharge pipe at the top; the outlet channel evenly distributes the sewage flowing out of the central water inlet channel, and is connected to the rectangular secondary sedimentation tank through the outlet pipe at the bottom; the mud collecting channel is connected to the rectangular secondary sedimentation tank through a return mud pipe at the bottom, and is connected to the mud suction device through a mud suction pipe at the top; the mud suction device includes a mud collecting pipeline and a central mud tank, and the sludge sucked through the mud suction pipeline is gathered from the mud collecting pipeline to the central mud tank, and the central mud tank is connected to the mud discharge pipe of the central water inlet channel at the bottom.

[0007] Furthermore, the rectangular secondary sedimentation tank includes an inlet trough, an outlet trough, a sludge discharge trough and a non-metallic chain scraper device; the water inlet trough is connected to the outlet pipe, and the lower part of the sludge discharge trough is connected to a plurality of sludge discharge pipes with holes in the pipe wall arranged on the bottom surface of the rectangular secondary sedimentation tank through a sludge discharge sleeve, and the non-metallic chain scraper device scrapes the sludge on the bottom surface of the rectangular secondary sedimentation tank into the sludge discharge pipe and gathers it in the sludge discharge trough.

[0008] In particular, the sewage in the biological pool flows into the central inlet channel from the inlet pipe, is evenly distributed to the outlet channel, flows into the rectangular secondary sedimentation tank inlet trough through the inlet and outlet pipes, and then flows out through the outlet trough; the sludge in the biological pool enters the rectangular secondary sedimentation tank inlet trough together with the sewage, is gathered in the sludge discharge trough by the non-metallic chain scraper device, flows back to the sludge collecting channel through the return sludge pipe, and the sludge suction device discharges the gathered sludge into the sludge discharge pipe.

[0009] Furthermore, the pneumatic device includes an air compressor, an oil-water separator, an industrial gas storage tank, an alkali solution absorption device, an activated carbon adsorption device and a nitrogen oxide removal gas storage tank; a cooler is also arranged between the air compressor and the oil-water separator to reduce the temperature of the compressed air generated by the air compressor; the oil-water separator is connected to the industrial gas storage tank through an air valve; one side of the industrial gas storage tank is connected to an air delivery device to provide industrial gas for aeration of the sludge collection channel, and the other side enters the nitrogen oxide removal gas storage tank through the alkali solution absorption device and the activated carbon adsorption device.

[0010] In summary, the present invention has the following beneficial effects: the present invention collects sewage, reduces the impact of flow changes on the treatment system, and can evenly distribute water. It can also complete the centralized configuration of the secondary sedimentation tank's water inlet, water outlet, and sludge return, and realize the need for a water distribution well to complete multiple functions, greatly reducing land occupation, reducing project investment, and reducing the unevenness of daily water distribution, sludge return, etc. At the same time, the sludge in the secondary sedimentation tank is uniformly treated to reduce the complexity of operation and management, and the floating of sludge in the secondary sedimentation tank can be reduced by reducing the denitrification reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the present invention;

[0012] Figure 2 It is a schematic diagram of the water distribution well structure of the present invention;

[0013] Figure 3 It is a schematic diagram of the structure of a rectangular secondary sedimentation tank of the present invention;

[0014] Figure 4 It is a schematic diagram of the structure of the pneumatic device of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described in detail below in conjunction with the embodiments in the accompanying drawings, but this does not constitute any limitation to the present invention.

[0016] Please refer to 1-4. The present invention aims to propose a method to solve the problem of small return flow in the rectangular secondary sedimentation tank. In the use of the existing rectangular secondary sedimentation tank, a large amount of fist-sized sludge often floats up. The non-metallic chain sludge scraping device (it is worth mentioning that the non-metallic chain sludge scraping device is consistent with the sludge scraping device used in the existing rectangular secondary sedimentation tank, and both have the functions of forward sludge scraping and return slag gathering) and the addition of an aeration device in the rectangular secondary sedimentation tank can reduce the above situation. However, when the water distribution well can only play the role of water distribution, the sludge treatment will be handled in the rectangular secondary sedimentation tank, and its treatment method is scattered. At the same time, it is easy to cause sludge to accumulate in the corners of the rectangular secondary sedimentation tank and the boundaries of the non-metallic chain sludge scraping device, thereby causing nitrate denitrification due to lack of oxygen. The aeration device contains nitrogen oxides, which aggravates the occurrence of this reaction. Therefore, the structure of the secondary sedimentation tank and the water distribution well is set as follows:

[0017] A secondary sedimentation tank water distribution well structure for preventing sludge deposition comprises a central inlet and peripheral outlet water distribution well 100 and a peripheral inlet and peripheral outlet rectangular secondary sedimentation tank 200 connected thereto through a water distribution pipe, the water distribution well 100 comprises a central water inlet channel 101 with a flow stabilizing tube in the middle, an outlet channel 102 arranged around the central water inlet channel 101 which is not connected to each other, and a mud collecting channel 103 sleeved around the outlet channel 102; the central water inlet channel 101 is connected to the outlet of sewage in the biological pool through an inlet pipe 104 at the bottom, and is connected to a mud suction device through a mud discharge pipe 105 at the top; the outlet channel 102 evenly distributes the sewage flowing out of the central water inlet channel 101, and is connected to the rectangular secondary sedimentation tank through an outlet pipe 400 at the bottom; the mud collecting channel 103 is connected to the rectangular secondary sedimentation tank through a mud return pipe 500 at the bottom, and is connected to the rectangular secondary sedimentation tank through a mud return pipe 500 at the top. The sludge suction device is connected through a sludge suction pipe 106; the sludge suction device includes a sludge collecting pipe 107 and a central sludge tank 108. The sludge sucked through the sludge suction pipe 106 is collected from the sludge collecting pipe 107 to the central sludge tank 108. The bottom of the central sludge tank 108 is connected to the sludge discharge pipe 105 of the central water inlet channel 101; the rectangular secondary sedimentation tank 200 includes an inlet trough 201, an outlet trough 202, a sludge discharge trough 203 and a non-metallic chain sludge scraper device 204; the inlet trough 201 is connected to the outlet pipe 400, and the bottom of the sludge discharge trough 203 is connected to a plurality of sludge discharge pipes 205 with holes in the pipe wall arranged on the bottom surface of the rectangular secondary sedimentation tank through sludge discharge sleeves. The non-metallic chain sludge scraper device 204 scrapes the sludge on the bottom surface of the rectangular secondary sedimentation tank 200 into the sludge discharge pipe 205 and then gathers it in the sludge discharge trough 203.

[0018] In this way, the sewage in the biological pool flows into the central water inlet channel 101 from the water inlet pipe 104, is evenly distributed to the water outlet channel 102, flows into the rectangular secondary sedimentation tank water inlet trough 201 through the water inlet and outlet pipes 400, and then flows out through the water outlet trough 202; the sludge in the biological pool enters the rectangular secondary sedimentation tank water inlet trough 201 together with the sewage, and is gathered in the mud discharge trough 203 by the non-metallic chain mud scraper device 204, and flows back to the mud collection channel 103 through the mud return pipe 500, and the mud suction device discharges the gathered sludge into the mud discharge pipe 105;

[0019] At the same time, in order to solve the nitrate denitrification reaction, the present invention also includes an aeration system arranged in the water distribution well and the rectangular secondary sedimentation tank through a pre-buried aeration pipe 300; the aeration system uses an air supply device to convey compressed air from the pre-buried aeration pipe 300 to the water distribution well 100 and the rectangular secondary sedimentation tank 200 to play an aeration role; the pre-buried aeration pipe 300 is respectively buried in the mud collection channel of the water distribution well and in the rectangular secondary sedimentation tank, and the pneumatic device provides industrial air for aeration of the mud collection channel and nitrogen oxide removal air for the rectangular secondary sedimentation tank through an air compressor. The pneumatic device includes an air compressor 301, an oil-water separator 302, an industrial gas storage tank 303, an alkali solution absorption device 304, an activated carbon adsorption device 305 and a nitrogen oxide removal gas storage tank 306; a cooler 307 is also arranged between the air compressor 301 and the oil-water separator 302 for reducing the temperature of the compressed air generated by the air compressor; the oil-water separator 302 is connected to the industrial gas storage tank 303 through an air valve; one side of the industrial gas storage tank 303 is connected to an air delivery device 308 for providing industrial gas for aeration of the mud collecting channel, and the other side enters the nitrogen oxide removal gas storage tank 306 through the alkali solution absorption device 304 and the activated carbon adsorption device 305, and then is connected to the rectangular secondary sedimentation tank through the air delivery device 308.

[0020] The above embodiments are preferred implementation modes of the present invention and are only used to facilitate the description of the present invention. They are not intended to limit the present invention in any form. Any person with ordinary knowledge in the relevant technical field, if they do not depart from the scope of the technical features of the present invention, can make equivalent embodiments by partial changes or modifications to the technical contents disclosed in the present invention, and they still fall within the scope of the technical features of the present invention without departing from the technical features of the present invention.

Claims

1. A secondary sedimentation tank water distribution well structure for preventing sludge deposition, comprising a central inlet and peripheral outlet water distribution well and a peripheral inlet and peripheral outlet rectangular secondary sedimentation tank connected to the water distribution well through a water distribution pipeline, characterized in that: It also includes an aeration system arranged in a water distribution well and a rectangular secondary sedimentation tank through a pre-buried aeration pipe; the aeration system uses an air delivery device to send compressed air from the pre-buried aeration pipe into the water distribution well and the rectangular secondary sedimentation tank to achieve aeration; the pre-buried aeration pipe is respectively buried in the mud collection channel of the water distribution well and the rectangular secondary sedimentation tank, and the pneumatic device provides industrial air for aeration of the mud collection channel and nitrogen oxide removal air for the rectangular secondary sedimentation tank through an air compressor; The rectangular secondary sedimentation tank comprises a water inlet trough, a water outlet trough, a mud discharge trough and a non-metallic chain mud scraping device; the water inlet trough is connected to the water outlet pipe, and the mud discharge trough is connected to a plurality of mud discharge pipes with holes in the pipe wall arranged on the bottom surface of the rectangular secondary sedimentation tank through a mud discharge sleeve, and the non-metallic chain mud scraping device scrapes the sludge on the bottom surface of the rectangular secondary sedimentation tank into the mud discharge pipe and gathers it in the mud discharge trough; The pneumatic device includes an air compressor, an oil-water separator, an industrial gas storage tank, an alkali solution absorption device, an activated carbon adsorption device and a nitrogen oxide removal gas storage tank; a cooler is also arranged between the air compressor and the oil-water separator to reduce the temperature of the compressed air generated by the air compressor; the oil-water separator is connected to the industrial gas storage tank through an air valve; one side of the industrial gas storage tank is connected to an air delivery device to provide industrial gas for aeration of the sludge collection channel, and the other side enters the nitrogen oxide removal gas storage tank through the alkali solution absorption device and the activated carbon adsorption device.

2. A secondary sedimentation tank water distribution well structure for preventing sludge deposition according to claim 1, characterized in that: The water distribution well includes a central water inlet channel with a flow stabilizing tube in the middle, an outlet channel that is not connected to each other and surrounds the central water inlet channel, and a mud collecting channel that is sleeved around the outlet channel; the central water inlet channel is connected to the outlet of the sewage in the biological pool through an inlet pipe at the bottom, and is connected to a mud suction device through a mud discharge pipe at the top; the outlet channel evenly distributes the sewage flowing out of the central water inlet channel, and is connected to a rectangular secondary sedimentation tank through an outlet pipe at the bottom; the mud collecting channel is connected to the rectangular secondary sedimentation tank through a return mud pipe at the bottom, and is connected to the mud suction device through a mud suction pipe at the top; the mud suction device includes a mud collecting pipeline and a central mud tank, and the sludge sucked through the mud suction pipeline is gathered from the mud collecting pipeline to the central mud tank, and the central mud tank is connected to the mud discharge pipeline of the central water inlet channel at the bottom.

3. The secondary sedimentation tank water distribution well structure for preventing sludge deposition according to claim 1 is characterized by: The sewage in the biological pool flows into the central inlet channel from the inlet pipe, is evenly distributed to the outlet channel, and then flows into the rectangular secondary sedimentation tank inlet trough through the inlet and outlet pipes, and then flows out through the outlet trough; the sludge in the biological pool enters the rectangular secondary sedimentation tank inlet trough together with the sewage, and is gathered in the sludge discharge trough by the non-metallic chain scraper device, and flows back to the sludge collecting channel through the return sludge pipe, and the sludge suction device discharges the collected sludge into the sludge discharge pipe.

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