A method for reducing overflow pollution at the end of a drainage system

Abstract

The present invention relates to a device and method for reducing overflow pollution at the end of a drainage system, and is applicable to a forebay of a drainage pump station. The device includes an in-situ purification device installed in the forebay, with a perforated circular fan plate on one side of the incoming water direction, a side plate connected to a cover plate, a perforated circular fan plate and a perforated inclined plate, and the top of the perforated inclined plate connected to the bottom of the perforated circular fan plate and the perforated plate. The perforated inclined plate can be completely closed and connected with the side plate, the perforated circular fan plate and the perforated plate, or it can be connected to only one side of the side plate and the perforated circular fan plate so that one corner of the perforated inclined plate is tilted downward and contacts with a mud outlet pipe; the processing unit includes a filler, a mud outlet pipe and an air blowing device, the filler fills the space formed by the plate structure, the mud outlet pipe stands vertically in the forebay, and the lower end is connected to a sewage interception pump. The present invention is applicable to the in-situ purification of pollution in the forebay of a drainage pump station on sunny and rainy days, eliminates black and smelly water in the forebay of a pump station, reduces the pollution load discharged from the pump station on rainy days, relieves the control pressure at the end of overflow pollution, and improves the ecological water environment of the basin.

Description

Technical Field

[0001] The present invention belongs to the field of river and lake water restoration, and provides a method for reducing overflow pollution at the end of a drainage system. The present invention is suitable for in-situ purification of pollution in the forebay of a drainage pump station on sunny and rainy days, eliminating black and smelly water in the forebay of a pump station, reducing the pollution load discharged by the pump station on rainy days, alleviating the control pressure of overflow pollution at the end, and improving the ecological water environment of the basin. Background Art

[0002] Overflow pollution at the end of the drainage system on rainy days is an important reason for the water quality of the receiving water body to exceed the standard or even become black and smelly. The drainage system in most parts of my country is a diversion drainage system. However, due to the rapid development of urbanization, the pipeline system is complicated, and pipeline damage and rain and sewage mixing are common, causing sewage to illegally enter the rainwater pipe (including sunny days) and enter the forebay of the drainage pump station at the end of the drainage system. On rainy days, it is discharged into the receiving river by the rainwater pump. Therefore, the overflow pollution source at the end of the drainage system mainly includes the sewage accumulated in the forebay on sunny days (that is, the water that was not drained after the previous rainy day and the mixed sewage that flowed into the forebay through the rainwater pipe and the pipe sludge in the pipeline), which can cause the water in the forebay to become black and smelly in severe cases.

[0003] The main function of the drainage pump station is to discharge the rainwater collected by the rainwater pipes in the service area into the river in a timely and rapid manner through the rainwater pump on rainy days to prevent urban waterlogging. Therefore, it is extremely difficult to require the overflow pollution terminal control to quickly purify the sewage with large flow, high pollution load and complex pollution components and discharge it into the receiving water body in a very short time. At present, the common overflow pollution terminal control technologies mainly include regulation and storage, coagulation-flocculation, cyclone separation, rapid filtration, artificial wetlands, chemical agents, microbial methods, etc.

[0004] The regulation and storage method is one of the most commonly used and effective methods, but it occupies a large area, has a large excavation depth, and after long-term use, sludge is easily deposited at the bottom, which is difficult to clean. Technical treatments such as coagulation-flocculation, cyclone separation, and rapid filtration have a fast effect on particulate matter, but are not effective for soluble pollutants, and usually require the installation of large equipment, which is costly and unsightly. Artificial wetlands can effectively remove soluble pollutants, but they occupy a large area and have a slow treatment speed. The chemical agent method is effective, but it will affect the water ecological environment, and the addition of agents requires the use of an addition device. Summary of the invention

[0005] One of the technical problems to be solved by the present invention is to provide a method for reducing the main pollutants (COD, NH4 + -N, etc.), to eliminate the black and smelly water in the front pool and effectively alleviate the overflow pollution end control pressure.

[0006] Another technical problem to be solved by the present invention is to provide a device for implementing the above method.

[0007] The present invention proposes to use the forebay of the drainage pump station as a small storage and treatment pool, making full use of the forebay space and sufficient sunny days to deeply purify the forebay sewage, an important pollution source of overflow sewage. By installing a simple in-situ purification device under the forebay water, filling it with functional materials such as biological fillers or agents, and using sunny days to deeply purify the water body, on the one hand, the black and smelly water in the forebay can be eliminated, and on the other hand, by reducing the pollution in the forebay, the pollution load of overflow sewage on rainy days can be reduced, thereby alleviating the pressure on the end control of overflow pollution.

[0008] The present invention provides a device for reducing overflow pollution at the end of a drainage system, which is suitable for a forebay of a drainage pump station, and comprises an in-situ purification device installed in the forebay, wherein the in-situ purification device comprises a plate structure and a processing unit, wherein the plate structure comprises a perforated circular fan plate, a perforated plate, a cover plate, a side plate and a perforated inclined plate, wherein the perforated circular fan plate faces a side of incoming water, the side plate is connected with the cover plate, the perforated circular fan plate and the perforated inclined plate, the top of the perforated inclined plate is connected with the bottom of the perforated circular fan plate and the perforated plate, the perforated inclined plate can be connected with only one side of the side plate and the perforated circular fan plate, and the cover plate can be opened to replace the type of filler in the plate structure.

[0009] Preferably, the perforated inclined plate is evenly distributed with longitudinal holes and transverse holes. The longitudinal holes play the role of water distribution and filler air channels. The transverse holes can minimize the head loss when the pool water flows through on rainy days and allow the air exposed by the aerator to enter the filler area evenly. The longitudinal holes and transverse holes are smaller than the minimum unit size of the filler.

[0010] Preferably, the perforated circular fan plate is shaped like a shell and has a streamlined structure. The outer plate surface of the perforated circular fan plate faces the water flow direction of the front pool, reducing the water flow resistance when the water volume is large and the flow rate is fast on rainy days. The hole size is smaller than the minimum unit size of the filler. An adjustment rod connected to the side wall of the front pool is provided outside the filler. The adjustment rod runs through the filler and the plate structure, and moves up and down in the adjustment groove through automatic control. The position of the filler can be adjusted according to the water level. When replacing the agent, repairing the device, or when it is necessary to minimize the water flow resistance and quickly drain the water in heavy rain, the device position can be raised by the adjustment rod to make it above the water surface.

[0011] Preferably, the treatment unit comprises filler, a mud discharge pipe, an aeration pipe and a blowing device, the filler fills the space formed by the plate structure, the mud discharge pipe is in contact with the bottom of an inclined angle of the perforated inclined plate, stands vertically in the front pool, and its lower end is connected to the sewage interception pump, the aeration pipe is connected to the blowing device, and an aerator is provided on the aeration pipe. The number of aeration pipes is determined according to the area of ​​the perforated inclined plate projected to the bottom of the front pool and the service area of ​​the selected aeration pipe; if anaerobic bacteria are used, the aeration pipe may not be installed, or the aeration pipe may be moved to other locations only for increasing the dissolved oxygen in the water body.

[0012] Preferably, the processing unit includes but is not limited to a microbial processing unit and a chemical processing unit. The processing unit filler includes but is not limited to fillers, microbial strains, and chemical agents, and multiple agents may also be added at the same time.

[0013] Preferably, the filler includes but is not limited to honeycomb filler, sponge filler, and composite filler.

[0014] Preferably, the attached microorganisms include but are not limited to nitrifying bacteria, denitrifying bacteria, and anaerobic ammonium oxidizing bacteria.

[0015] Preferably, the lower end of the mud outlet pipe can be connected to a sewage interception pump or a sludge collection device.

[0016] Preferably, the perforated inclined plate can be connected with the perforated plate and the side plate to achieve a state where one corner is inclined toward the mud outlet pipe, ensuring that the detached biofilm is removed by gravity and the sewage interception pump. Alternatively, when the filler is a chemical agent or a bacterial strain, the perforated inclined plate is fixedly connected with one side plate and the perforated circular fan plate to form a completely closed plate structure.

[0017] Preferably, the upper open end of the mud outlet pipe is designed to be an openable and closable structure, for example, a pipe cover is installed at the upper open end of the mud outlet pipe, and the mud outlet pipe body and the pipe cover are connected in a hinged manner. When the perforated inclined plate is fixedly connected to only one side plate and the perforated circular fan plate so that one corner of the perforated inclined plate is tilted downward, the upper open end of the mud outlet pipe is in an open state, and one corner of the perforated inclined plate is tilted downward to align with the upper open end of the mud outlet pipe; when the filler is a chemical agent or a strain of bacteria or the perforated inclined plate is fixedly connected to one side plate and the perforated circular fan plate, the upper open end of the mud outlet pipe is in a closed state.

[0018] The device of the present invention can be used for in-situ purification of pollution in the forebay of a drainage pump station on sunny and rainy days, eliminate black and smelly water in the forebay of a pump station, reduce the pollution load discharged from the pump station on rainy days, relieve the terminal control pressure of overflow pollution, and improve the ecological water environment of the basin.

[0019] Preferably, the present invention uses honeycomb fillers for microorganisms to attach and grow, which is also conducive to water distribution and water flow. Aeration through aeration pipes provides the oxygen required for microbial growth, while increasing the dissolved oxygen in the water body, alleviating the black and smelly water in the front pool on sunny days.

[0020] Preferably, the filler of the present invention contains an oxidant, and an anti-oxidation paint can be applied to the plate structure and the adjusting rod structure. Anti-corrosion paint can also be applied to all parts of the device of the present invention that are in direct contact with the chemical agent.

[0021] The present invention also provides an in-situ purification method for overflow pollution at the end of a drainage system. The above-mentioned device for reducing overflow pollution at the end of a drainage system is fixed in the forebay of a drainage pump station, with a width of about half of the width of the forebay, for example 2 / 5-3 / 5.

[0022] Preferably, the device for reducing overflow pollution at the end of the drainage system is fixed on the wall of the pool in front of the drainage pump station, and its highest point is not higher than the lowest water level of the pool in front of the drainage pump station on a sunny day.

[0023] In the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", "longitudinal", "horizontal", "up", "down", "front", "back", "left", "right" and the like indicating directions or positional relationships are based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of simplifying the description of the present invention, rather than indicating that the equipment or elements referred to must have a specific direction, operate and be constructed in a specific direction. Therefore, please do not understand them as limitations on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0024] The advantages and positive effects of the present invention are: making full use of the space in the forebay of the drainage pump station and sufficient sunny time, reducing the sewage in the forebay by installing an in-situ purification device, eliminating black and smelly water bodies, and reducing the end control pressure of overflow pollution. The device is simple in design, easy to operate and maintain, flexible in the use of chemicals, easy to operate, and low in construction and operation costs. The device is located underwater, does not need to occupy ground space, and does not affect the beauty of the city. A mud outlet pipe is provided, which is connected to the sewage interception pump, and there is no need to handle the generated sludge separately. It is equipped with a perforated inclined plate with horizontal holes, a perforated circular fan plate and a water passage, which can ensure to the greatest extent that urban drainage is not affected when the water volume is large on rainy days. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, each drawing in the following description is for some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A side view of an implementation of an in-situ purification method for overflow pollution proposed by the present invention.

[0027] Figure 2 This is a schematic diagram of an in-situ purification method for overflow pollution proposed by the present invention.

[0028] Among them, when the filler is biological filler, one corner of the perforated inclined plate is tilted downward to align with the mud outlet pipe and is not completely connected with the side plate and the perforated plate, so as to remove the biofilm and activated sludge that fall off when fixed filler is used.

[0029] Figure 3 This is a schematic diagram of another in-situ purification method for overflow pollution proposed by the present invention.

[0030] Among them, when the filler is a granular adsorbent or oxidant, one side of the perforated inclined plate is tilted downward and is completely connected with the side plate and the perforated plate. The complete connection is to use granular fillers or adsorbents such as activated carbon without causing the loss of such fillers and agents. The mud outlet pipe can be designed as an openable and closable mud outlet pipe. When the plate structure is completely connected, the mud outlet pipe is in a closed state.

[0031] In the figure: 1. perforated circular fan plate; 100. perforated plate; 101. cover plate; 102. side plate; 2. perforated inclined plate; 21. longitudinal hole; 22. transverse hole; 3. filler; 4. mud outlet pipe; 5. adjusting rod; 51. adjusting groove; 52. rod adjusting device; 6. aeration pipe; 61. aerator; 7. sewage interception pump; 8. blowing device; 9. granular adsorbent and oxidant. DETAILED DESCRIPTION

[0032] The present invention provides an in-situ reduction method for overflow pollution at the end of a drainage system, which is specifically manifested in that a simple purification device is installed in the forebay of a drainage pump station, one side of the device is fixed on the wall of the forebay or a bracket is installed and the bracket is fixed to the bottom of the forebay, the device includes a vertical sealing plate, a perforated inclined plate, a perforated circular fan plate and a processing unit, the processing unit is surrounded by perforated plates, wherein the bottom is a perforated inclined plate, a perforated circular fan plate shaped like a shell is installed on the side of the incoming water, so that water enters the processing unit evenly and contacts with the filler, the perforated plate is shaped like a shell to realize a streamlined design and the vertical and horizontal holes on the perforated inclined plate can compensate for the hydraulic loss caused by the device when the water volume in the forebay of the pump station is large on rainy days. The processing unit is filled with fillers, and an adjusting rod is provided for adjusting the position of the fillers, and a mud outlet pipe is provided to transport the biofilm and settled particles that slide down due to the gravity of the inclined plate to the sewage interception pump of the forebay, an aeration pipe is arranged under the perforated inclined plate to increase dissolved oxygen and facilitate the growth of functional microorganisms, and a water passage is provided to reduce the water flow resistance and head loss during drainage.

[0033] The present invention installs a simple purification device in the forebay of a drainage pump station, utilizes the space in the forebay of the drainage pump station and sufficient time on sunny days to perform in-situ treatment on the sewage in the forebay, and reduces the pollution load discharged on rainy days at the end of the drainage system.

[0034] Figure 1 A side view showing an implementation of an in-situ purification method for overflow pollution at the end of a drainage system.

[0035] The in-situ purification device includes an in-situ purification device installed in the front pool, the in-situ purification device includes a plate structure and a processing unit, the plate structure includes a perforated circular fan plate 1, a perforated plate 100, a cover plate 101, a side plate 102 and a perforated inclined plate 2, the perforated circular fan plate 1 is arranged on one side of the water inlet direction, and the cover plate 101 can be opened to facilitate the replacement of materials such as fillers 3.

[0036] The technical solution will be clearly and completely described below through the embodiments of the present application. Obviously, the described embodiments are only part of the preferred embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0037] Example 1

[0038] like Figure 1 , 2 As shown, this embodiment is based on the biological contact oxidation method to mainly remove ammonia nitrogen and COD in the sewage in the forebay. The device is fixed on the wall of the forebay, and its width is about half of the width of the forebay to leave a water passage to avoid affecting urban drainage on rainy days. The height is set to the lowest water level in the forebay of the pump station on sunny days to ensure the longest contact time between the water body and the filler. The perforated inclined plate 2 is not fully connected with the perforated plate 100 and the side plate 102, so that one corner is tilted toward the mud outlet pipe 4 to ensure that the detached biofilm is removed by gravity and the sewage interception pump. Honeycomb filler 3 is used for microorganisms to attach and grow, and aeration through the aeration pipe 6 provides the oxygen required for microbial growth, while increasing the dissolved oxygen in the water body to alleviate the black and smelly water in the forebay on sunny days. On rainy days, the incoming water is mainly discharged into the river through the water passage through the rainwater pump. It can be seen that the present invention is mainly aimed at the pollution of the forebay on sunny days. Since the pollution load discharged by the pump station on rainy days mainly comes from the pollution load already existing in the forebay water body and the pollution load newly flowing into the forebay through the rainwater pipe on rainy days, the reduction of pollution in the forebay on sunny days by the present invention can greatly alleviate the pollution load discharged by the pump station on rainy days.

[0039] Example 2

[0040] like Figure 3 As shown, this embodiment is based on the chemical adsorption oxidation method to mainly remove ammonia nitrogen and COD in the sewage in the front pool. The filler 3 in Example 1 is replaced with a granular adsorbent and an oxidant 9. When the agent fails, the agent is replaced and added regularly. The perforated inclined plate 2 is fully closed by being fully connected to the perforated plate 100 and the side plate 102. The mud outlet pipe 4 is designed to be openable and closable. When the plate structure is fully connected, the mud outlet pipe is usually in a closed state to avoid the use of granular fillers or adsorbents such as activated carbon, which may cause the loss of such fillers and agents. If a chemical method is used to remove the pollution load, it should be ensured that the pore size of the perforated plate 100 orifice structure is smaller than the particle size of the smallest unit of the chemical agent.

[0041] The above-described embodiments are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be thought of by any technician familiar with the art within the technical scope disclosed in the present application without creative work should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims in the present application.

Claims

1. A device for reducing overflow pollution at the end of a drainage system, suitable for the forebay of a drainage pump station, characterized in that: The invention comprises an in-situ purification device installed in a forebay of a drainage pump station, wherein the in-situ purification device comprises a plate structure and a processing unit, wherein the plate structure comprises a perforated circular fan plate (1), a perforated plate (100), a cover plate (101), a side plate (102) and a perforated inclined plate (2), wherein the perforated circular fan plate (1) is located on one side of the incoming water direction, the cover plate (101) is arranged on the top of the perforated plate (100) and the side plate (102) in a separate or connected manner, the side plate (102) is connected to the cover plate (101), the perforated circular fan plate (1) and the perforated inclined plate (2), and the top of the perforated inclined plate (2) is connected to the bottom of the perforated circular fan plate (1) and the perforated plate (100); The perforated circular fan plate (1) is shell-shaped and has a streamlined structure. The outer plate surface of the perforated circular fan plate faces the water flow direction of the fore pool. The perforated inclined plate (2) is provided with longitudinal holes (21) and transverse holes (22). The longitudinal holes (21) and transverse holes (22) on the perforated inclined plate (2) are evenly distributed. The processing unit is a microbial processing unit or a chemical processing unit; The microbial treatment unit comprises a filler (3), a mud outlet pipe (4), an aeration pipe (6) and a blasting device (8); the perforated inclined plate (2) is fixedly connected to only one side plate (102) and the perforated circular fan plate (1) so that one corner of the perforated inclined plate (2) is tilted downward; the filler (3) fills the space formed by the plate structure; the upper opening end of the mud outlet pipe (4) contacts the bottom of the downward tilted corner of the perforated inclined plate (2); the mud outlet pipe (4) is vertically fixed in the forebay of the drainage pump station; the lower opening end is in contact with the sewage interception pump; (7) connection; the chemical treatment unit comprises granular adsorbent and oxidant (9), a mud outlet pipe (4), an aeration pipe (6) and a blast device (8); the perforated inclined plate (2) is fixedly connected to a side plate (102) and a perforated circular fan plate (1) to form a completely closed plate structure; the granular adsorbent and oxidant (9) fill the space formed by the plate structure; the mud outlet pipe (4) is designed to be openable and closable; when the plate structure is fully connected, the mud outlet pipe is usually in a closed state to avoid loss of fillers and reagents; An adjusting rod (5) connected to the side wall of the front pool is arranged outside the plate structure, and the adjusting rod (5) penetrates the plate structure and the internal space of the plate structure in the horizontal direction.

2. The device for reducing overflow pollution at the end of a drainage system according to claim 1, characterized in that: The filler (3) is a honeycomb filler with a large specific surface area.

3. The device for reducing overflow pollution at the end of a drainage system according to claim 1, characterized in that: The aeration pipe (6) is connected to the blowing device (8), and an aerator (61) is provided on the aeration pipe.

4. The device for reducing overflow pollution at the end of a drainage system according to claim 1, characterized in that: The filler (3) is a honeycomb filler, a sponge filler or a combined filler; microorganisms are attached thereto, and the attached microorganisms are nitrifying bacteria, denitrifying bacteria or anaerobic ammonia oxidizing bacteria.

5. An application of the device for reducing overflow pollution at the end of a drainage system according to claim 1, characterized in that: The device for reducing overflow pollution at the end of the drainage system is used for in-situ purification of pollution in the forebay of the drainage pump station on sunny and rainy days, eliminating black and smelly water in the forebay of the pump station, reducing the pollution load discharged by the pump station on rainy days, alleviating the control pressure of overflow pollution at the end or improving the ecological water environment of the basin; A honeycomb filler (3) is used to allow microorganisms to attach and grow, and aeration is performed through an aeration pipe (6) to provide the oxygen required for the growth of the microorganisms, thereby increasing the dissolved oxygen in the water body and alleviating the black and smelly water in the pool on sunny days.

6. The use of the device for reducing overflow pollution at the end of a drainage system according to claim 5, characterized in that: When the plate structure is filled with granular adsorbent and oxidant, the plate structure and the adjusting rod are coated with anti-oxidation material.

7. An in-situ purification method for overflow pollution at the end of a drainage system, characterized in that: The device for reducing overflow pollution at the end of a drainage system as described in claim 1 is fixed in the forebay of a drainage pump station.

8. The in-situ purification method for overflow pollution at the end of a drainage system according to claim 7, characterized in that: The width of the device for reducing overflow pollution at the end of the drainage system is 2 / 5-3 / 5 of the width of the forebay of the drainage pump station, and the highest point of the device for reducing overflow pollution at the end of the drainage system is not higher than the lowest water level of the forebay of the drainage pump station on a sunny day.

9. The in-situ purification method for overflow pollution at the end of a drainage system according to claim 7, characterized in that: When replacing the reagent, overhauling or heavy rain requires water to flow quickly, the device position is raised by adjusting the rod (5) so that the adjusting rod is above the water surface.

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