System for urban overflow pollution control and treatment

Abstract

The utility model provides a system for controlling and treating urban overflow pollution. The system comprises a sewer sludge degradation unit, a diversion unit and an ecological purification unit which are sequentially arranged along the water flow direction, wherein the sewer sludge degradation unit is arranged at the tail end of a pipeline or a box culvert and comprises an ultra-nano gas dissolution and reoxygenation device, a biochemical culture device, a stirring device and a sludge screening and dewatering device; the flow dividing unit comprises a flow dividing well arranged at the discharge port; the ecological purification unit comprises an ecological base and a fixing device used for fixing the ecological base. Through the mode, a triple overflow pollution control mechanism of sewer sludge degradation, accurate first rain interception and water quality ecological purification at the tail end is formed, the problem of water body pollution caused by sewer sludge accumulated in a rainwater pipeline or a box culvert and first rain overflow is solved in a targeted manner, the water quality is remarkably improved, the overall treatment efficiency is improved, and the economic benefit is increased. And an innovative, efficient and eco-friendly solution is provided for urban overflow pollution control and treatment.

Description

Technical Field

[0001] The utility model relates to the technical field of water environment treatment, in particular to a system for controlling and treating urban overflow pollution. Background Art

[0002] Overflow pollution of rivers and lakes usually refers to the phenomenon that in a combined sewer system, when the rainfall exceeds the designed treatment capacity of the sewer system, the mixed sewage (including domestic sewage, industrial wastewater and initial rainwater) that has not been fully treated cannot be fully accepted by the sewage treatment plant, and is discharged directly into rivers, lakes and other natural water bodies through the overflow port. Overflow pollution usually occurs during or after rainfall, especially during heavy rainfall events, when the capacity of the drainage system reaches its limit and cannot effectively treat and transport all the sewage and rainwater mixture. In addition, even in some areas that use a separate drainage system, if there is a problem of mixed rainwater and sewage, that is, the rainwater pipe and the sewage pipe are incorrectly connected, it may also cause sewage to overflow with rainwater during heavy rain, forming a similar overflow pollution problem.

[0003] Controlling and reducing overflow pollution is an important challenge in water environment management, which is usually achieved by improving sewage treatment capacity and transforming rainwater management systems, such as building larger reservoirs to store rainwater, increasing green infrastructure to enhance rainwater infiltration and purification capacity, implementing pipeline separation transformation, and optimizing the operation strategy of sewage treatment plants. However, the current technical measures generally have the following shortcomings: First, interception wells are set at the end of the rainwater system with serious mixing and misconnection. When faced with instantaneous rainfall, flood control and drainage are often the main focus, and accurate interception cannot be achieved; second, the black and smelly sludge accumulated in the pipeline is washed into the river with rainwater, causing the river to turn black and smelly.

[0004] In view of this, it is necessary to design an improved system for urban overflow pollution control and treatment to solve the above problems. Utility Model Content

[0005] In view of the defects of the above-mentioned prior art, the purpose of the present utility model is to provide a new urban overflow pollution control and treatment system which can be used to achieve precise interception, ditch sludge degradation and has an ecological purification function at the end, so as to cope with the increasingly severe overflow pollution challenges and achieve continuous improvement of river and lake water quality and restoration of ecological balance.

[0006] To achieve the above-mentioned purpose, the utility model provides a system for controlling and treating urban overflow pollution, comprising a ditch sludge degradation unit, a diversion unit and an ecological purification unit which are sequentially arranged along the water flow direction; the ditch sludge degradation unit is arranged at the end of a pipeline or a culvert, and comprises an ultra-nano aerosol reoxygenation device and a biochemical culture device for outputting oxygen-rich water and microbial agents to the pipeline or the culvert respectively, a stirring device for mud and water mixing, and a sludge screening and dehydration device; the diversion unit comprises a diversion well arranged at the discharge port; the ecological purification unit comprises an ecological base and a fixing device for fixing the ecological base.

[0007] As a further improvement of the utility model, the ultra-nano aerosol reoxygenation device is provided with a water inlet, a water outlet and an air inlet device, and the air inlet device is connected to an external pure oxygen source through a pipeline.

[0008] As a further improvement of the utility model, the water inlet includes a first water inlet arranged at the end of the outlet or in the river channel and a second water inlet arranged in the pipeline or the culvert.

[0009] As a further improvement of the utility model, the water outlet includes a first water outlet arranged at the end of the outlet or in the river channel and a second water outlet arranged in the pipeline or the culvert.

[0010] As a further improvement of the present invention, the stirring device is a pneumatic stirring device, including an air outlet pipeline arranged along the bottom of the pipeline or the box culvert.

[0011] As a further improvement of the utility model, the sludge screening and dewatering device includes a screening and dewatering main device and an inlet slurry pump connected to the screening and dewatering main device, and the inlet slurry pump is arranged in a pump pit upstream of the diversion unit.

[0012] As a further improvement of the present invention, the biochemical culture device includes a microbial culture device for preparing microbial agents and two microbial agent output pipes connected to the microbial culture device; the output ends of the two microbial agent output pipes are respectively arranged in the river channel and in the pipe or culvert.

[0013] As a further improvement of the present invention, the diversion unit also includes a monitoring device and a flow limiting device arranged in the diversion well.

[0014] As a further improvement of the utility model, the monitoring device includes a liquid level meter and a COD monitoring meter, and the flow limiting device includes a flow limiting valve and a lower opening weir gate.

[0015] As a further improvement of the present invention, the fixing device includes a fixed pipe rack for fixing the ecological base, a buoy arranged at the upper end of the fixed pipe rack, and a bottom fixing device arranged at the bottom of the fixed pipe rack.

[0016] The beneficial effects of the utility model are:

[0017] 1. The system for urban overflow pollution control and treatment provided by the utility model can form a triple guarantee mechanism by arranging a ditch sludge degradation unit for treating sewage and sludge at the end of a rainwater pipe or a culvert, a diversion unit for accurate interception at the outlet, and an ecological purification unit downstream of the diversion unit to further purify the water quality. The synergy between the three guarantees is utilized to solve the water pollution problems caused by ditch sludge accumulated in rainwater pipes or culverts and initial rain overflow, and significantly improve the water quality. At the same time, through scientific, intelligent and automated interception scheduling, the effective operation of each functional unit is ensured, the overall treatment efficiency is improved, and an innovative, efficient and eco-friendly solution is provided for urban overflow pollution control and treatment.

[0018] 2. The system for controlling and treating urban overflow pollution provided by the utility model is provided with a ditch sludge degradation unit integrated with an ultra-nano aerosol reoxygenation device, a stirring device, a sludge screening and dehydration device, and a biochemical culture device. The stirring device can be used to fully mix the deposited sludge with rainwater, and the pollutants are effectively treated and degraded under the joint action of the oxygen-rich water and microbial agents provided by the ultra-nano aerosol reoxygenation device and the biochemical culture device. The bottom sludge is then screened and dehydrated by the sludge screening and dehydration device, thereby realizing efficient treatment of sewage and sludge in pipes or culverts.

[0019] 3. The system for urban overflow pollution control and treatment provided by the utility model can further set the water inlet and outlet of the ultra-nano aerosol reoxygenation device into two groups, so that different water inlets and outlets can be opened on sunny days and rainy days respectively, so as to carry out targeted regulation of different water conditions. At the same time, the utility model can monitor the water condition in real time by setting monitoring devices such as liquid level meter and COD monitoring meter in the diversion well, so as to adjust the flow limiting scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the system for controlling and treating urban overflow pollution provided by the utility model.

[0021] Figure 2 This is a schematic diagram of the main structure of a ditch sludge degradation unit in a system for controlling and treating urban overflow pollution provided by the utility model.

[0022] Figure 3This is a schematic structural diagram of the water inlet and outlet of the ultra-nano aerosol reoxygenation device in the system for urban overflow pollution control and treatment provided by the utility model.

[0023] Figure 4 This is a schematic diagram of the main structures of the ditch sludge degradation unit and the diversion unit in the system for urban overflow pollution control and treatment provided by the utility model.

[0024] Figure 5 This is a schematic diagram of the structure of an ecological purification unit in a system for controlling and treating urban overflow pollution provided by the utility model.

[0025] Reference numerals

[0026] 1- ditch sludge degradation unit; 2- diversion unit; 3- ecological purification unit;

[0027] 11-ultra-nano aerosol reoxygenation device; 111-water inlet; 112-water outlet; 12-stirring device; 13-sludge screening and dehydration device; 131-inlet slurry pump; 132-screening and dehydration main device; 14-biochemical culture device; 21-liquid level meter; 22-COD monitoring meter; 23-current limiting device; 31-ecological base; 32-buoy; 33-bottom fixing device. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0030] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0031] like Figure 1As shown, the utility model provides a system for controlling and treating urban overflow pollution, comprising a ditch sludge degradation unit 1, a diversion unit 2 and an ecological purification unit 3 arranged in sequence along the water flow direction. The ditch sludge degradation unit 1 is arranged at the end of the pipe or culvert, and is used to treat the sewage and sludge in the rainwater pipe or culvert; the diversion unit 2 is arranged at the outlet, and diverts the flow through the diversion well to achieve accurate interception of the initial rain; the ecological purification unit 3 is arranged downstream of the outlet, and is used to further purify the water quality at the end of the outlet.

[0032] Such a setting can form a triple overflow pollution control mechanism of ditch sludge degradation, precise interception of initial rain and ecological purification of water quality at the end. It specifically solves the water pollution problems caused by ditch sludge accumulated in rainwater pipes or culverts and initial rain overflow, significantly improves water quality, and enhances overall treatment efficiency, providing an innovative, efficient and eco-friendly solution for urban overflow pollution control and management.

[0033] Please refer to Figure 2 The ditch sludge degradation unit 1 includes an ultra-nano aerosol reoxygenation device 11 for outputting oxygen-rich water to the pipeline or culvert, a stirring device 12 for mixing mud and water, a sludge screening and dehydration device 13, and a biochemical culture device 14 for outputting microbial agents to the pipeline or culvert. With such a configuration, the stirring device 12 can be used to fully mix the deposited sludge with rainwater, and under the combined action of the oxygen-rich water and microbial agents provided by the ultra-nano aerosol reoxygenation device 11 and the biochemical culture device 14, the pollutants are effectively treated and degraded, and then the bottom sludge is screened and dehydrated by the sludge screening and dehydration device 13, so as to achieve efficient treatment of sewage and sludge in the pipeline or culvert.

[0034] For details, please refer to Figure 3 In some embodiments of the utility model, the ultra-nano aerosol reoxygenation device 11 is provided with two groups of water inlets 111 and two groups of water outlets 112. Among them, the two groups of water inlets 111 include a first water inlet arranged at the end of the outlet or in the river channel and a second water inlet arranged in the pipeline or box culvert, and the two groups of water outlets include a first water outlet arranged at the end of the outlet or in the river channel (preferably a position about 100 meters downstream of the river channel) and a second water outlet arranged in the pipeline or box culvert (preferably 500 to 100 meters upstream of the diversion well). The first water inlet, the second water inlet, the first water outlet, and the second water outlet are respectively connected to the main part of the ultra-nano aerosol reoxygenation device through corresponding pipelines, and each pipeline is equipped with a corresponding control valve and a liquid level meter to facilitate the adjustment of the water intake and the monitoring of the treatment process. With such an arrangement, on sunny days, the second water inlet and the second water outlet can be opened, and on rainy days, after the gate in the diversion well is opened, the first water inlet is opened, the second water outlet is closed, and the first water outlet is opened, so as to perform targeted regulation according to different situations.

[0035] The ultra-nano aerosol reoxygenation device 11 is also provided with an air intake device, which is connected to an external pure oxygen source through a pipeline to provide a stable oxygen supply to the ultra-nano aerosol reoxygenation device to form an oxygen-rich water body. The ultra-nano aerosol reoxygenation device 11 can also be provided with an oxygen concentration monitoring instrument to monitor the aerosol effect in real time.

[0036] Please refer to Figure 4 In some embodiments of the utility model, the stirring device 12 is a pneumatic stirring device, including a pneumatic control device arranged on the ground and an air outlet pipeline arranged along the bottom of the pipeline or culvert. The pipeline wall of the air outlet pipeline is evenly opened with holes for outputting airflow, so that the deposited sludge and rainwater are fully mixed to improve the treatment effect. The layout length of the air outlet pipeline can be selected according to actual design requirements, preferably 500 to 1000m. The sludge screening and dewatering device 13 includes a screening and dewatering main device 132 and an inlet slurry pump 131 connected to the screening and dewatering main device 132. The inlet slurry pump 131 is arranged in a pump pit upstream of the diversion unit 2, and is used to screen and dewater the bottom sludge, and the residual water after dehydration is returned to the pipeline or culvert.

[0037] In some embodiments of the present invention, the biochemical culture device 14 includes a microbial culture device for preparing a microbial agent and two microbial agent output pipes connected to the microbial culture device, and the output ends of the two microbial agent output pipes are respectively arranged in the river channel and the pipe or culvert, so as to transport the microbial agent to the river channel and the pipe or culvert, and use microorganisms to continuously degrade organic pollutants and ammonia nitrogen. Among them, the types of microbial agents and their culture methods are all existing conventional methods, and the present invention does not improve or limit them. When performing microbial culture, it is preferred to use raw water in the pipeline or river channel to culture indigenous microorganisms to meet the needs of the corresponding pipeline or river channel.

[0038] Please refer to Figure 4 In some embodiments of the utility model, the diversion unit 2 includes a diversion well arranged at the outlet, a monitoring device arranged in the diversion well, and a flow limiting device 23. Among them, the monitoring device includes a liquid level meter 21 and a COD monitoring meter 22, and may also include other devices such as a flow meter and a monitor, which are used to monitor the water body conditions so as to adjust the flow limiting device 23 as needed. The flow limiting device 23 can be one or a combination of a flow limiting valve and a lower weir gate. With such a setting, the water body conditions can be monitored in real time, and dynamic adjustments can be made according to the water quality and liquid level, so as to effectively distinguish polluted rainwater from clean rainwater in the rainy season, so as to adjust the flow limiting scheme.

[0039] Please refer to Figure 5In some embodiments of the utility model, the ecological purification unit 3 includes an ecological base 31 and a fixing device for fixing the ecological base 31; the fixing device includes a fixed pipe rack for fixing the ecological base 31, a buoy 32 arranged at the upper end of the fixed pipe rack, and a bottom fixing device 33 arranged at the bottom of the fixed pipe rack. Specifically, the ecological purification unit 3 is generally located 20 to 25 meters downstream of the outlet end. In order to facilitate subsequent maintenance, it is preferred to construct an integrated structure, fix the ecological base on the fixed pipe rack, suspend the upper end through the buoy, and fix the bottom to the bottom of the river channel through the bottom fixing device 33. Among them, the ecological base 31 is an existing conventional ecological base, and the utility model does not improve and limit it. The fixed pipe rack is preferably a PE pipe rack, and the bottom fixing device 33 can be a concrete block or an anchoring structure. In this way, the ecological base can be effectively fixed, and its large-scale enrichment of microorganisms can be used to form a biofilm with a rich population, and then the biofilm is used to absorb and utilize nitrogen and phosphorus substances in the water for biological proliferation, thereby achieving the purpose of degrading water pollution.

[0040] The working principle of the system for urban overflow pollution control and treatment provided by the utility model is specifically described below:

[0041] The system for controlling and treating urban overflow pollution provided by the utility model mainly performs triple control through a ditch sludge degradation unit 1, a diversion unit 2 and an ecological purification unit 3.

[0042] Among them, when the ditch sludge degradation unit 1 and the diversion unit 2 are working: select the window period when small and medium rainfall has just ended, set up air bags and interception shields 500-1000m in front of the rainwater culvert outlet (when the water level is full and cannot be dispatched, the air bag can be used for temporary blocking, and the interception shield can be used for non-full pipes), close the weir gate at the outlet, and form a relatively closed space in front and behind. Use the stirring device 12 to fully mix the sediment sludge and rainwater, and at the same time, add microbial agents online through the biochemical culture device 14, and then start the ultra-nano aerosol reoxygenation device 11 to reoxygenate the closed section sewage. In an aerobic and anaerobic environment, microorganisms continue to degrade organic pollutants and ammonia nitrogen. After running for 1-2 days, the removal rate of organic pollutants and ammonia nitrogen in the water can reach more than 70%, achieving the goal of carbon reduction and nitrogen removal. After the online instrument monitors that the COD in the water reaches the set standard, the pneumatic stirring and ultra-nano reoxygenation are stopped, and the water is left to stand for 1 hour. The height of the discharge weir gate is gradually adjusted to discharge about 70% of the upper clear water from the top, and the bottom sludge is pumped to the sludge treatment system for treatment. The dehydrated sludge is then transported to the designated location. After the sludge is treated, the interception device is opened and the outlet weir gate is closed. The intercepted upstream water enters the terminal space by flushing under the action of gravity. After the water level is balanced, the interception device is closed and the sludge degradation and treatment process is entered again. Until the sludge in the culvert is cleared, the drainage pipe can perform its normal drainage function.

[0043] The diversion unit 2 can intercept dry-flow sewage and polluted rainwater with excessive COD by setting a diversion well at the outlet of the combined sewer network or the rainwater outlet, and send them to the sewage treatment plant for treatment, while the clean rainwater is discharged into the water body. The diversion well uses the online water quality instrument and liquid level meter 21 and the intelligent flow limiting device 23 to achieve maximum clean and polluted diversion under various working conditions. During the rainy season, when the treatment capacity of the sewage treatment plant is not enough to treat all the intercepted polluted rainwater, it is necessary to build a storage tank and rapid purification facilities to temporarily store the polluted rainwater and perform rapid purification treatment.

[0044] Under the condition of drainage priority, after the onshore interception and pollution reduction facilities play a limited role, the outlet will inevitably discharge polluted rainwater into the water body. The ecological purification unit 3 set in the utility model uses the flow field simulation technology at the outlet to lay out the underwater ecological base 31 module in the main direction of pollution diffusion, and the bottom is fixed with rivets. The ecological base 31 is laid out according to the direction of water flow. The ecological base 31 module is woven from hydrophilic polymer materials with ultra-large specific surface area, which can enrich microorganisms in large quantities and form a biofilm with rich populations. The biofilm absorbs and utilizes nitrogen and phosphorus substances in the water body for biological proliferation, thereby achieving the purpose of degrading water pollution.

[0045] Through the synergistic effect of the above three units, the system for urban overflow pollution control and treatment provided by the utility model can achieve precise interception and ditch sludge degradation, and has an ecological purification function at the end, which can cope with the increasingly severe overflow pollution challenges and achieve continuous improvement of river and lake water quality and restoration of ecological balance.

[0046] In summary, the utility model provides a system for controlling and treating urban overflow pollution, including a ditch sludge degradation unit 1, a diversion unit 2 and an ecological purification unit 3 arranged in sequence along the water flow direction; wherein the ditch sludge degradation unit 1 is arranged at the end of a pipe or a culvert, and includes an ultra-nano aerosol reoxygenation device 11, a biochemical culture device 14, a stirring device 12 and a sludge screening and dehydration device 13; the diversion unit 2 includes a diversion well arranged at the outlet; the ecological purification unit 3 includes an ecological base 31 and a fixing device for fixing the ecological base 31. In the above manner, the utility model forms a triple overflow pollution control mechanism of ditch sludge degradation, precise interception of initial rain and ecological purification of water quality at the end, which specifically solves the problem of water pollution caused by ditch sludge accumulated in rainwater pipes or culverts and initial rain overflow, significantly improves water quality, improves overall treatment efficiency, and provides an innovative, efficient and eco-friendly solution for urban overflow pollution control and treatment.

[0047] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.

Claims

1. A system for urban overflow pollution control and treatment, characterized in that: It comprises a ditch sludge degradation unit, a diversion unit and an ecological purification unit which are sequentially arranged along the water flow direction; the ditch sludge degradation unit is arranged at the end of a pipeline or a culvert, and comprises an ultra-nano aerosol reoxygenation device and a biochemical cultivation device for respectively outputting oxygen-rich water and microbial agents to the pipeline or the culvert, a stirring device for mud and water mixing, and a sludge screening and dehydration device; the diversion unit comprises a diversion well arranged at the outlet; the ecological purification unit comprises an ecological base and a fixing device for fixing the ecological base.

2. The system for controlling and treating urban overflow pollution according to claim 1 is characterized in that: The ultra-nano gas-dissolving reoxygenation device is provided with a water inlet, a water outlet and an air inlet device, and the air inlet device is connected with an external pure oxygen source through a pipeline.

3. The system for controlling and treating urban overflow pollution according to claim 2 is characterized in that: The water inlet comprises a first water inlet arranged at the end of the outlet or in the river channel and a second water inlet arranged in the pipeline or the culvert.

4. The system for controlling and treating urban overflow pollution according to claim 2 is characterized in that: The water outlet comprises a first water outlet arranged at the end of the outlet or in the river channel and a second water outlet arranged in the pipeline or the culvert.

5. The system for controlling and treating urban overflow pollution according to claim 1 is characterized in that: The stirring device is a pneumatic stirring device, comprising an air outlet pipeline arranged along the bottom of the pipeline or the box culvert.

6. The system for controlling and treating urban overflow pollution according to claim 1 is characterized in that: The sludge screening and dewatering device comprises a screening and dewatering main body device and an inlet slurry pump connected to the screening and dewatering main body device, and the inlet slurry pump is arranged in a pump pit upstream of the diversion unit.

7. The system for controlling and treating urban overflow pollution according to claim 1, characterized in that: The biochemical culture device comprises a microbial culture device for preparing a microbial agent and two microbial agent output pipelines connected to the microbial culture device; the output ends of the two microbial agent output pipelines are respectively arranged in the river channel and in the pipeline or culvert.

8. The system for controlling and treating urban overflow pollution according to claim 1 is characterized in that: The diversion unit also includes a monitoring device and a flow limiting device arranged in the diversion well.

9. The system for controlling and treating urban overflow pollution according to claim 8, characterized in that: The monitoring device includes a liquid level meter and a COD monitoring meter, and the flow limiting device includes a flow limiting valve and a lower opening weir gate.

10. The system for controlling and treating urban overflow pollution according to claim 1, characterized in that: The fixing device comprises a fixing pipe rack for fixing the ecological base, a buoy arranged at the upper end of the fixing pipe rack, and a bottom fixing device arranged at the bottom of the fixing pipe rack.

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