WO2021174722A1

WO2021174722A1 - Regulation, storage, and purification system and method for controlling rain and sewage confluence and overflow pollution

Info

Publication number: WO2021174722A1
Application number: PCT/CN2020/098154
Authority: WO
Inventors: 王利群; 邢汉君; 张碧波; 李晶; 冉启洋; 聂芳; 胡逸萱
Original assignee: 湖南恒凯环保科技投资有限公司
Priority date: 2020-03-04
Filing date: 2020-06-24
Publication date: 2021-09-10
Also published as: CN111285546A; CN111285546B

Abstract

According to a regulation, storage, and purification system and method for controlling the rain and sewage confluence and overflow pollution in the present invention, a water inlet gallery comprises a water inlet of a sewage pumping station, a water inlet of a regulation and storage sedimentation tank, and a water inlet and emergency overflow port of a water storage type ecological filter of which the height increases in sequence, and a clarification overflow port of the regulation and storage sedimentation tank connected to the water storage type ecological filter so as to form a gradient route for the graded treatment according to the rainfall: a rain-free or light rainfall route: the water inlet gallery, the sewage pumping station, and a sewage treatment plant; a moderate rainfall route: the water inlet gallery, the regulation and storage sedimentation tank, and the sewage treatment plant; a long-term continuous moderate rain route: the water inlet gallery, the regulation and storage sedimentation tank, the water storage type ecological filter, and a natural water body; a heavy rainfall route: the water inlet gallery, the water storage type ecological filter, and the natural water body; and a rainstorm route: the water inlet gallery, the emergency overflow port overflown to the natural water body. The subsequent route comprises all the previous routes. The system greatly reduces the pollution load discharged into the water body under the limited regulation and storage volume condition, which is economical and efficient.

Description

Storage and purification system and method for controlling rain and sewage combined overflow pollution

Technical field

The invention belongs to the technical field of sewage treatment, and specifically relates to a combined overflow pollution control system, which strengthens the control of drainage pollution in rainy season through regulation and purification measures, improves the environmental quality of surface water, and can be applied to the treatment of black and odorous water bodies and the construction of sponge cities.

Background technique

At present, most of the old urban areas in my country still adopt the combined drainage system of rain and sewage. The combined drainage system will exist for a long time before all districts are completely transformed into the diversion system. When the rainstorm in the rainy season exceeds the design capacity of the confluence pipeline, the excess rain and sewage mixed sewage overflows from the overflow facilities or drainage pumping stations of the confluence pipeline into the urban water body. These overflows are usually called rain and sewage combined overflow. The combined overflow contains untreated domestic sewage, commercial sewage and industrial sewage and rainwater runoff, various pollutants, such as pathogens, oxygen-consuming pollutants, suspended solids, nutrients, toxic substances and floating substances. Directly lead to the rapid deterioration of the water quality of the receiving water body. The overflow pollution problem of the combined system has severely restricted the improvement of my country's water environment quality for a long time, and has become an unavoidable and urgent problem in the construction of sponge cities and the treatment of black and odorous water bodies at this stage. In recent years, my country’s "Water Pollution Prevention and Control Action Plan" and "Guiding Opinions on Promoting Sponge City Construction" and other important documents have strengthened attention to water pollution caused by combined overflow. The "Guidelines for Water Body Rehabilitation Work" also incorporates the combined overflow pollution as one of the point source pollution into the compilation scope requirements of the remediation plan. Undoubtedly, the combined overflow pollution control has become a problem that needs to be solved urgently in the current stage of the black and smelly water remediation and the construction of sponge cities in my country.

The treatment of combined overflow pollution can be treated separately through the three stages of the source, migration, sink and other pollutant migration paths: (1) Source control measures: mainly refers to the transformation of rain and sewage diversion system in the combined area. Sponge transformation: The source control and diversion system transformation of pollutants is a measure to completely solve the problem of overflow pollution. However, because the merged areas of built-up areas are mostly old urban areas, it is difficult to transform, among which the amount of coordination is huge, the time-consuming, and the investment is large. It is difficult to achieve in the short term. (2) Migration control measures: mainly refer to the process of pollutants from entering the collection pipe network system to finally being discharged into the receiving water body. The treatment measures during the migration process mainly include the modification of mixed connections and the regular flushing of pipelines. The modification of mixed connection and misconnection is the same as the modification of the shunt system. The workload is large and time-consuming. It is necessary to sort out the series connection points of the pipe network system, and at the same time, abolish and block the series connection pipe network. (3) Sink control measures: It mainly refers to the centralized treatment of the final collected pollutants at the end of the discharge, mainly including the storage pond or the terminal treatment complex. These devices are mostly a single rain and sewage interception and diversion structure. That is, a single device is used to treat the sewage generated under a certain working condition. Each device has a large volume and a large area, and the sewage has a long residence time, which makes the sewage easy to be black and smelly. The intercepted sewage is also discharged to the sewage treatment plant for treatment, which has a high operating load.

Summary of the invention

Aiming at the problems of a single structure of existing sink control measures, large floor space, black and odorous water bodies, and high operating load of sewage treatment plants, the present invention proposes a regulation, storage and purification system for controlling combined overflow pollution of rain and sewage. Set entrances to different treatment facilities such as overflow, regulation and storage, purification, etc. at different heights on the water inlet corridor to deal with the rain and sewage confluence under different weather conditions such as sunny, light rain, moderate rain, heavy rain, and heavy rain in different gradients. System sewage. The invention also includes a regulation, storage and purification method for controlling rain and sewage combined overflow pollution.

The technical scheme of the present invention:

A regulation, storage and purification system for controlling rain and sewage combined overflow pollution, comprising a water inlet gallery, a sewage pump station, a regulation and storage sedimentation tank, and a water storage ecological filter. The water inlet gallery is included in the water inlet gallery. The sewage pumping station inlet, the water inlet of the regulation and storage sedimentation tank, the water inlet and emergency overflow of the water storage ecological filter, and the clarification overflow outlet of the regulation and storage sedimentation tank connected to the water storage ecological filter are successively increased in height on the road. In order to form a gradient line for the treatment of combined overflow sewage in different gradients, the gradient line includes no rain or low rainfall line, medium rainfall line, long-term continuous moderate rain line, heavy rainfall line and heavy rain line;

The rain-free or low-rainfall line sequentially includes a water inlet gallery, a sewage pumping station inlet, and a sewage pumping station, and the sewage pumping station is connected to the sewage treatment plant;

The medium rainfall line includes the no-rain or low-rainfall line, and also includes a pipeline formed by the water inlet gallery, the water inlet of the regulating and storing sedimentation tank, the diversion and sedimentation system in the regulating and storing sedimentation tank, the venting system and the backwashing system, Both the emptying system and the backwashing system of the regulating and storing sedimentation tank are connected to the sewage treatment plant;

The long-term continuous moderate rain line includes the no-rain or light-rainfall line and the medium-rainfall line, and also includes the overflow outlet clarified by the regulation and storage sedimentation tank, the water distribution system of the water storage type ecological filter, and the purification system , The pipeline formed by the natural oxygenation system and the drainage system, the drainage system leading to the natural water body;

The heavy rainfall line includes the no rain or light rainfall line, the medium rainfall line and the long-term continuous moderate rain line, and also includes the water inlet of the water storage type ecological filter on the water intake corridor, and the water storage type ecological filter The pipelines formed by the water distribution system, purification system, natural oxygenation system and drainage system of which lead to natural water bodies;

The rainstorm line includes the no rain or light rain line, the medium rain line, the long-term continuous medium rain line and the heavy rain line, and also includes the emergency overflow formed by the overflow from the water inlet gallery to the natural water body Pipeline.

The bottom elevation of the water inlet of the sewage pumping station is flush with the bottom of the water inlet gallery; the height of the liquid level of the domestic sewage in the water inlet gallery from the bottom of the water inlet gallery on a sunny day is H ₀ , and the storage sedimentation tank The installation height of the water inlet in the water inlet corridor is H ₀ ～2H ₀ ; the installation height of the water storage ecological filter inlet on the water inlet corridor in the water inlet corridor is 2H ₀ ～3H ₀ ; The emergency overflow on the water gallery has a height of 3H ₀ ～4H ₀ in the water inlet gallery.

The water storage ecological filter includes a sand filter layer, a functional matrix layer, and a plant planting layer from bottom to top in order to form a purification system of the water storage ecological filter;

The sand filter layer adopts medium sand with a particle size of 0.2-0.6mm, of which filter sand with a particle size of 0.25-0.5mm accounts for >50%, and the filling height of the sand filter layer is 0.7-1.3 meters;

The functional matrix layer adopts 80-100 mesh pyrite and biomass charcoal with a filling ratio of 2:1-1:2 to form iron-carbon micro-electrolytic oxidation organic matter, pyrite autotrophic denitrification and denitrification. Nitrogen, biomass charcoal adsorbs nitrogen and phosphorus and other multi-functional matrix layers, the filling height of the functional matrix layer is 0.3-0.5 meters;

The total height of the functional matrix layer and the sand filter layer is 0.8-1.2m;

The plant planting layer includes a submerged plant layer and an emergent plant layer, with a layer height of 0.5-1.1 meters, the emergent plants are selected to tolerate flooding, and the planting density is 3-9 plants per square meter.

The water distribution system of the water storage ecological filter includes a main water distribution corridor, a water distribution well, and a water distribution pipe;

The main water distribution corridor is a structure with a height difference, and is arranged along the sideline and diagonal line of the regulation and storage type ecological filter tank. The water inlet of the water storage ecological filter on the water inlet gallery is connected, and the bottom of the main water distribution gallery is respectively connected with a water distribution pipe and a water distribution well located inside the pool body for water intake;

There are multiple water distribution pipes, which are arranged at the deep bottom of the pool body along the main water distribution gallery. A number of water distribution pipes are arranged radially around.

The drainage system of the water storage type ecological filter includes a drainage gallery, a collection well, a perforated filter tube, a rainwater pump house and an emergency overflow outlet of the water storage type ecological filter;

The perforated filter pipe is laid horizontally in the functional matrix layer for collecting water, and the rainwater collected through the perforated filter pipe is discharged into a water collection well. The pump house is connected by a drainage pipe, and the rainwater pump house leads to surface water;

The upper part of the ecological filter and higher than the water collection well has an emergency overflow of the ecological filter.

The regulation and storage sedimentation tank includes a plurality of corridors arranged in parallel, and each of the corridors includes a corridor entrance, a diversion sedimentation system, a vent system, a backwash system and a clarification overflow weir;

The corridor entrance is located on the side wall of the entrance of each corridor, and is connected to the water inlet of the sedimentation tank of the regulation and storage tank, and the clarification overflow weir is located at a side opposite to the water inlet of the regulation and storage sedimentation tank. On the side of the tank wall, the lower edge of the clarification overflow weir is lower than the water inlet of the regulation and storage sedimentation tank, and the lower edge of the clarification overflow weir is arranged at the same height as the water inlet of the regulation and storage tank for the purpose of controlling clarification. For the overflow flow, the clarification overflow weir is arranged with a U-shaped section made of stainless steel every 20cm. In order to ensure that the storage and sedimentation tank maintains a clarification and sedimentation time of 0.5-1.0 hours, a 2.50×0.50m interception port is set in the outlet trough of the clarification overflow weir, and a sharp-angled stainless steel plate with an opening size of 2.50×0.45m is installed Before opening, adjust the clarification overflow flow by changing the size of the opening;

The diversion sedimentation system includes a plurality of diversion plates, and the diversion plates are arranged diagonally downward and crosswise on both sides of the pool walls of each of the corridors to form a diversion sedimentation tank;

The emptying system includes a drainage tank, an emptying pump station, and a gate. The drainage tank is located at the bottom of the pool body close to the entrance of the corridor. The drainage tank has a gate and is connected to an emptying pumping station. Connect to sewage treatment plant;

The backwash system includes a water baffle and a flush valve, the water baffle is located in the middle of each of the corridors and is fixed at the bottom of the pool, and the height of the water baffle is 1/3 of the height of the pool body ~2/3, the corridor is divided by the water baffle into a flushing corridor between the entrance of the corridor and the water baffle, and a water storage chamber between the water baffle and the clarification overflow weir, the The flushing corridor has a drainage groove, the bottom of the water storage chamber has a slope that decreases from the side wall of the pool body to the water baffle, and the water baffle is provided with a flushing valve, which forms when the flushing valve is opened. The reverse flushing water flow from the water storage chamber to the flushing corridor and the drainage groove.

The system also includes a grid room and a submersible louver wall. The grid room is located between the water inlet of the sewage pump station and the sewage pump station. The diving louver wall is evenly distributed at the overflow outlet.

The system also includes a blower and a deodorizing room. The blowers are respectively located in the grill room and the sewage pumping station. The exhaust air of the blower leads to the deodorizing room, and the deodorizing room is provided with a deodorizing device.

A regulation, storage and purification method for controlling combined overflow pollution of rain and sewage. The above-mentioned regulation, storage and purification system for controlling combined overflow and pollution of rain and sewage is adopted to process the combined overflow according to the amount of domestic sewage and surface runoff during rainfall. Flowing sewage, specifically:

(1) When it is sunny, the line with no rain or light rainfall is adopted. The sewage in the receiving area flows into the sewage pumping station from the water intake gallery through the sewage pumping station inlet, and then is transported to the sewage treatment plant by submersible pumps and pressure pipes ；

(2) In light rain or in the early stage of rainfall, that is, when the flow of mixed rain and sewage is less than twice the flow of sewage in a sunny day, pipelines and inlet corridors can still provide a certain amount of water storage space. When the water storage height is lower than the storage sedimentation tank At the height of the water inlet, the rain-free or low-rainfall line is adopted, and the mixed sewage with high concentration of rain and sewage flows into the sewage pump station through the sewage pump station inlet, and then is sent to the sewage treatment plant by the submersible pump for treatment;

(3) In a moderate rainy day, that is, when the mixed flow of rain and sewage exceeds twice the flow of sunny sewage, the combined sewage diluted by rainwater will accumulate in a large amount in the water inlet gallery. When the mixed sewage is stored to the height of the water inlet of the storage sedimentation tank At the time, the medium rainfall line is used to flow into the regulation and storage sedimentation tank through the inlet of the regulation and storage sedimentation tank and be trapped in this closed rainwater regulation and storage sedimentation tank. When the rainfall drops later, the intercepted sewage in the regulation and storage sedimentation tank passes through the submersible pump Be extracted and transported to the sewage treatment plant;

(4) When the rainwater storage sedimentation tank is filled with long-term continuous moderate rain, the long-term continuous moderate rain line is adopted, and the sewage flows from the overflow outlet of the storage sedimentation tank/the clarification overflow outlet of the storage sedimentation tank according to the interception flow. It flows out and is transported to the water storage ecological filter. When the filling layer of the water storage ecological filter is saturated and starts to hold back water, the rainwater pump is turned on to discharge the rainwater into the surface water body;

(5) In heavy rain, when the regulation and storage sedimentation tank is full and the continuous sewage inflow from the pipeline is greater than the sum of the sewage outflow flow from the regulation and storage sedimentation tank and the delivery volume of the sewage pumping station, it will cause The stagnant water of the pipeline system adopts a heavy rainfall line, and the rainwater is directly discharged to the ecological filter through the water storage type ecological filter inlet, and then discharged to the water body after purification treatment by the ecological filter;

(6) In the case of heavy rain, a heavy rain line is adopted. When the amount of rainwater reaches the height of the emergency overflow in the water inlet gallery, the rainwater is directly discharged into the surface water body through the emergency overflow and the drainage ditch.

The process of sewage flowing through the water storage ecological filter is as follows:

The overflow water of the storage tank and/or the overflow water of the inlet gallery is introduced into the main water distribution gallery through the upper part of the main water distribution gallery, falls to the bottom of the main water distribution gallery by gravity, and then flows into the deep bottom of the water storage ecological filter. In the water distribution pipe, sewage is introduced from the bottom of the water storage ecological filter into the tank body, and then the sewage flows through the sand filter layer, the functional matrix layer and the plant planting layer from bottom to top in the water storage ecological filter for purification After that, it will be discharged through a collection well or overflow;

A level control gauge is installed at the storage depth of 1m in the water storage ecological filter, and the rainwater pump house of the drainage system is controlled by the level control gauge. When the water storage height reaches 1m, the rainwater pump in the rainwater pump house is turned on. The water in the collection well of the water storage type ecological filter is drained to the surface water body, thereby forming a vertical intermittent operation mode of the water storage type ecological filter, ensuring that the pores of the lower layer filter material are kept breathable and oxygenated; When the height reaches 1.5m, it directly overflows to the surface water body through the emergency overflow outlet of the water storage ecological filter.

The beneficial technical effects of the present invention:

The regulation, storage and purification system proposed by the present invention to control rain and sewage combined overflow pollution mainly includes structures such as water inlet corridors, sewage pumping stations, regulation and storage sedimentation tanks, and water storage ecological filters. According to the amount of domestic sewage in the catchment area and the surface runoff during rainfall, the intake corridor is set at different heights of the intake corridor to lead to sewage pumping stations, storage sedimentation tanks, water storage ecological filters and natural water bodies, etc. The inlets of different treatment facilities are used to process the combined overflow sewage in a gradient to solve the problem of combined overflow pollution under different weather conditions and different rainfall conditions, and to achieve high-concentration domestic sewage and initial rainwater entering the sewage treatment plant for processing During heavy rainfall, the low-concentration mixed sewage diluted by rainwater is purified by the water storage ecological filter and then discharged into the water body, reducing the pollutants entering the water body and reducing the operating pressure of the sewage treatment plant, combined with regular air conditioning and sedimentation The sewage in the pond and filter can avoid the problem of black odor caused by long-term storage of high-concentration sewage in the storage pond, and further improve the quality of life of surrounding residents. In summary, the integrated system for regulating, storing and purifying can realize gradient treatment, and can divide and treat the combined sewage during heavy rainfall such as moderate rain, heavy rain, and heavy rain. Therefore, the volume required by each device is greatly reduced, and it can be adjusted in a limited manner. Under the condition of storage volume, it can realize cost-effective and drastically reduce the pollution load discharged into the water body.

The gradient lines of the main structure include no rain or low rainfall lines, medium rainfall lines, long-term continuous moderate rain lines, heavy rainfall lines and heavy rain lines, and the specific action modes are as follows:

(1) When it is sunny, the line with no rain or light rainfall is adopted. The sewage in the receiving area flows from the water intake gallery through the sewage pump station inlet into the sewage pump station, and then is transported to the sewage pump station by the submersible pump and the existing pressure pipe Sewage treatment plant;

(2) In light rain or in the early stage of rainfall, that is, when the flow of mixed rain and sewage is less than twice the flow of sewage in a sunny day, pipelines and inlet corridors can still provide a certain amount of water storage space. When the water storage height is lower than the storage sedimentation tank At the height of the water inlet, the line with no rain or low rainfall is still adopted, and the mixed sewage with higher concentration of rain and sewage flows into the sewage pump station through the inlet of the sewage pump station, and is pumped to the sewage treatment plant for treatment;

(3) In a moderate rainy day, that is, when the mixed flow of rain and sewage exceeds twice the flow of sunny sewage, the combined sewage diluted by rainwater will accumulate in a large amount in the water inlet gallery. When the mixed sewage is stored to the height of the water inlet of the storage sedimentation tank At the time, the medium rainfall line is used to flow into the regulation and storage sedimentation tank through the inlet of the regulation and storage sedimentation tank and be trapped in this closed rainwater regulation and storage sedimentation tank. When the rainfall drops later, the intercepted sewage in the regulation and storage sedimentation tank is passed through the submersible pump. Extract and transport to the sewage treatment plant;

(4) When the rainwater storage sedimentation tank is filled with long-term continuous moderate rain, the long-term continuous moderate rain line is adopted, and the sewage flows out from the overflow outlet of the storage sedimentation tank according to the interception flow and is transported to the water storage ecological filter. In the pond, when the filling layer of the ecological filter is saturated and starts to hold back water, the rainwater pump is turned on to discharge the rainwater into the surface water body;

(5) In heavy rain, when the full state of the storage sedimentation tank and the continuous sewage inflow from the pipeline are greater than the sum of the sewage outflow flow of the storage sedimentation tank and the transportation volume of the sewage pumping station, it will cause the pipeline The backwater of the system adopts the heavy rainfall line, and the rainwater is directly discharged to the ecological filter through the water storage ecological filter inlet on the water inlet corridor, and is discharged to the water body after purification treatment by the water storage ecological filter;

(6) In the case of heavy rain, in the case of heavy rain, a heavy rain line is adopted. When the rainwater reaches the height of the emergency overflow in the water inlet gallery, the rainwater is directly discharged into the surface water body through the emergency overflow and the drainage ditch.

In the case of heavy rain, in order to ensure the timely drainage of the combined sewage, a high-level emergency overflow weir and drainage ditch are constructed before the storage and sedimentation tank, and the heavy rain is directly introduced into the water body at the peak of the rain. In addition, a layered diving grid is installed at the entrance of the overflow weir to ensure that no coarse and suspended substances will be discharged into the lake under heavy rain, which will affect the water quality of the water body.

Preferably, there is a grid between the inlet of the sewage pumping station and the sewage pumping station in the water intake corridor, and the sewage is first treated by the grid for slag removal treatment and then flows into the sewage pumping station; the sewage accumulated in the water intake corridor Diving louvered walls are set up at different inlets of the regulation and storage sedimentation tanks, ecological filters, water bodies, etc., which are composed of layered diving metal plates to prevent particulate solids from entering through the shallow weir, and floating and suspended materials are effectively suppressed. Moreover, the water flowing between the baffles always flows into the pool below the inflow water surface, and the trapped substances settle down beside the baffles and enter the pipeline to continue to flow to the grille in front of the sewage pumping station. Therefore, the submersible louver wall does not need to be maintained and operated. Easy to manage.

Preferably, a layered diving wall is arranged at the water inlet of the regulation and storage sedimentation tank to intercept the larger grid slag and suspended matter in the sewage. The intercepted material settles down in front of the baffle and enters the water inlet pipe to continue to flow between the grids. The sediment that settles to the bottom of the tank through the trapped sedimentation tank is washed by the washing equipment and is transported to the sewage treatment plant.

Preferably, the odor generated by the grill room and the sewage pumping station is continuously extracted by a blower and purified in the waste gas treatment equipment in the deodorizing room. Preferably, the odor adopts a photochemical ionization ion deodorizing device, with the help of UVC-radiation catalytic reaction to generate a large amount of positive and negative oxygen ions, which has strong oxidizing properties and can oxidize and decompose nails in a very short time. Mercaptans, ammonia, hydrogen sulfide, ethers, amines and other polluting odor factors.

Preferably, the regulation and storage sedimentation tank includes a gallery entrance, a diversion sedimentation system, a backwash system, a vent system and a clarification overflow weir. The combined sewage is accumulated and precipitated in the regulation and storage sedimentation tank, and then the clarified water is discharged into the water storage ecological filter through the clarification overflow weir. The principle of setting up the clarification overflow outlet is to keep the residence time of the combined sewage in the regulation and storage sedimentation tank at 1 hour to ensure that the combined sewage is fully precipitated. After the tank is emptied, the sediment at the bottom of the tank is flushed through the flushing system, and the flushed sewage is discharged to the sewage treatment plant for treatment.

Preferably, in order to ensure uniform and sufficient water inflow and backwashing, the regulation and storage sedimentation tank of the present invention is provided with several corridors; the cross-arrangement of deflectors in the regulation and storage tank can increase the circuitous flow path of the sewage in the tank, obliquely The baffle arranged below facilitates the suspended matter settled on the inclined plate to slide into the bottom under the action of gravity, and then be removed by backwashing at the bottom. Through the diversion effect of the deflector, the sewage in the regulation and storage sedimentation tank flows in a circuitous manner, so that the flow path of the sewage in the tank is lengthened under the condition of a small tank capacity, and the static sedimentation effect of the suspended solids in the sewage is improved.

Preferably, a number of flushing corridors are arranged at the bottom of the regulation and storage sedimentation tank, and each flushing corridor has a washing room/storage room at the end. When the regulation and storage sedimentation tank is full, the flushing room/storage room is provided with a check The valve/flush valve pipe is full. After the precipitation time has elapsed, the storage and sedimentation tank is evacuated by the pump through the drainage tank, and at the same time, the stagnant water in the remaining washing room stays in the washing room. In front of the flushing room/storage room, that is, the flushing valves installed on the water baffle are opened in sequence according to the time interval. The substances deposited at the bottom of the flushing corridor are blocked by the wave-characteristic water flow from the flushing room/storage room under the action of the slope. Flush into the drainage trough at the entrance of the corridor, and from here through the pipeline to the sewage pumping station.

The regulation and storage sedimentation tank in the present invention is set in the ground, and the ground can be used as a leisure activity area, which can maximize the land utilization of the area, and is of great significance to the current market environment with scarce land resources.

Preferably, in order to ensure that the pollutants in the combined sewage are effectively disposed of, the storage-type ecological filter is mainly composed of a water distribution system, a drainage system, a purification system, etc., and the clarified water after precipitation in the storage and sedimentation tank is introduced into the ecological filter for further Purification treatment, and then used for landscape water in the area or directly discharged into the water body.

The water storage ecological filter of the present invention adopts the mode of natural oxygenation. The ecological filter is designed to be emptied regularly and adopts a vertical intermittent operation mode. Under sunny or light rain conditions, through intermittent operation, the lower layer is guaranteed The pores of the filter material are kept breathable and oxygenated. Combined with setting up a vent pipe at the end of the perforated filter tube, to ensure that the microorganisms are in an aerobic environment, to avoid the anaerobic odor of the filter, and to solve the problem of filter blockage.

Preferably, the water distribution system includes a main water distribution gallery, a water distribution well, a water distribution pipe, and an overflow outlet of the water inlet gallery. Set up along the edge and diagonal of the pool body. In order to ensure uniform water distribution, a certain number of water distribution wells are connected to the main water distribution gallery, and then a certain number of water distribution pipes are arranged radially, and the water distribution pipes are arranged at the deep bottom of the filter tank. , The sewage flows through the filter tank from bottom to top in the upward direction. In the case of continuous heavy rain, rainwater flows directly into the ecological filter through the overflow of the water inlet gallery, and flows into the collection well after plant purification and adsorption treatment of functional substrates.

The drainage system includes a drainage gallery, a collection well, a perforated filter pipe and a rainwater pump house. The water is collected through a perforated filter pipe laid horizontally on the functional matrix layer, and a 45° elbow and PVC- are arranged at the end of the perforated filter pipe. The U pipe fitting extends upward to above the liquid level, and is provided with an air inlet on the upper part as a ventilation pipe for the water collection pipe of the filter. The rainwater collected through the perforated filter tube is drained into the collection well. The collection well is connected to the drainage gallery. The rainwater pump house is connected to the drainage gallery through the drainage pipe. The rainwater pump is pumped to the surface water body. In addition, under rainstorm conditions, the ecological filter also has an emergency overflow of the ecological filter directly leading to the surface water. The emergency overflow of the ecological filter is 1.5m higher than the surface of the filter material to ensure that the filter has a high Water storage capacity, when the water storage height reaches 1.5m, it directly overflows to the surface water body through the emergency overflow outlet of the water storage ecological filter. In summary, the rainwater pump and ecological filter emergency overflow control filter has a good water storage capacity, alleviating the impact of surface runoff on surface water bodies under heavy rain conditions.

The purification system of the water storage ecological filter includes a filling layer and a planting layer. The filler layer includes a functional matrix layer and a sand filter layer. The functional matrix layer uses pyrite and biomass charcoal with a particle size of 80-100 mesh, and the filling ratio is 2:1-1:2, such as 1:1, The filling height of the functional matrix layer is 0.3-0.8 meters; the sand filter layer adopts medium sand with a particle size of 0.2-0.6mm, of which the filter sand with a particle size of 0.25-0.5mm accounts for >50%, and the sand filter layer is filled The installation height is 0.7-1.3 meters, such as 1 meter; above the filler layer is a plant planting layer, including a submerged plant layer and an emergent plant layer, and the layer height is set to 0.5-1.1 meters, such as 0.8 meters, to increase plant planting The height space of the layer is combined with the height of the emergency overflow of the ecological filter at 1.5m to ensure the deep purification ability of the plant under the high water storage capacity of the filter. The emergent plants of the plant planting layer choose the water-resistant type, and the planting density is every 3-9 plants per square meter, for example 6 plants.

Preferably, under non-storm conditions, the rainwater can be used as landscape fountain water after being treated by the ecological filter to realize the recycling of water resources. It is a multifunctional structure integrating regulation and storage, throttling discharge and purification of sewage.

The present invention fully combines gray treatment facilities such as diversion, regulation and storage, and green treatment facilities such as ecological purification, and realizes the control of combined overflow pollution through a complete set of safe and environmentally friendly drainage and sewage treatment systems. The processing system can achieve improvements in the following aspects:

(1) Remove hydraulic congestion in the combined pipe network and eliminate overflow pollution;

(2) During heavy rain, the operating pressure of the sewage treatment plant can be reduced by regulating and storing off-peak surface runoff;

(3) By regulating the sedimentation of the sedimentation tank and the purification of the water storage ecological filter, the combined sewage diluted in the rainy season can be directly discharged into the water body after being treated accordingly;

(4) During heavy rains, the water storage ecological filter is used to adsorb pollutants, interception and bio-ecological degradation of the mixed flood discharge sewage before entering the water body, so as to reduce the impact of the mixed rain sewage on the water quality of the water body.

(5) When rainfall comes in, the storage and sedimentation tank can accumulate and precipitate mixed sewage with high pollution concentration, and transfer it to the sewage treatment plant for treatment, which greatly reduces the pollution load into the water body.

Description of the drawings

Figure 1 is a process flow diagram of a regulation, storage and purification system for controlling rain and sewage combined overflow pollution according to the present invention;

Figure 2 is a schematic diagram of a regulation, storage and purification system for controlling rain and sewage combined overflow pollution according to the present invention;

Figure 3 is a plan view of the storage tank;

Figure 4 is the A-A diagram of Figure 3;

Figure 5 Figure 3 B-B diagram;

Figure 6 is a schematic cross-sectional view of a water storage ecological filter.

Reference signs: 1 water inlet gallery, 11 sewage pump station water inlet, 12 storage and sedimentation tank water inlet, 13 ecological filter tank water inlet, 14 emergency overflow outlet, 15 horizontal grille, 16 louvered submersible wall, 2 grid Grid room, 3 sewage pumping station, 4 deodorization room, 5 regulation and storage sedimentation tank, 51 flushing gallery, 52 flushing valve, 53 venting gate, 54 regulation and storage sedimentation tank overflow, 55 deflector, 56 corridor entrance , 57 drainage troughs, 58 water baffles, 59 water storage rooms, 6 water storage ecological filters, 61 water distribution main corridors, 62 water pipes, 63 water distribution wells, 64 water collection wells, 65 rainwater pump houses, 66 ecological filters Emergency overflow, 67 planting layer, 68 functional matrix layer, 681 perforated filter tube, 69 sand filter layer, 7 liquid level control gauge.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with embodiments and accompanying drawings 1-6. The specific embodiments described here are only used to explain the present invention, and are not used to limit the protection scope of the present invention.

Example 1

With reference to Figures 1 to 2, a regulation and storage purification system for controlling rain and sewage combined overflow pollution in this embodiment includes water inlet corridor 1, grid room 2, sewage pumping station 3, deodorization room 4, regulation and storage Sedimentation tank 5 and water storage type ecological filter 6.

The water inlet corridor 1 includes the sewage pumping station water inlet 11, the storage sedimentation tank water inlet 12, the ecological filter water inlet 13 and the emergency overflow outlet 14 for emergency overflow to the water body under rainstorm conditions. This sewage pumping station The bottom elevation of the water inlet 11 is flush with the bottom of the water inlet corridor 1, and the water inlet 11 of the sewage pumping station is connected with the grid room 2 through a pipe, and the high-concentration mixed sewage of rain and sewage in sunny days, light rain and early rainfall is fed into the sewage pump station. The outlet 11 is discharged into the grid room 2 for deslagging treatment, and then discharged into the sewage pumping station 3 through the pipeline, and the high-concentration combined rain and sewage sewage is pumped to the sewage treatment plant for treatment through the sewage pump in the sewage pumping station 3. The sewage pump in 3 keeps one used and one ready to ensure that one sewage pump can continue to send sewage to the sewage treatment plant for treatment if there is a problem.

The water inlet 12 of the regulation and storage sedimentation tank is set at a position 0.4m higher than the bottom of the water inlet gallery 1. The water inlet 12 of the regulation and storage sedimentation tank is connected with the regulation and storage sedimentation tank 5. When the mixed sewage in the pipeline reaches the height of the water inlet 12 of the regulation and storage sedimentation tank, it flows into the regulation and storage sedimentation tank 5 through this opening. A louvered diving wall 16 is provided at the water inlet 12 of the regulation and storage sedimentation tank to remove suspended solids in the sewage and reduce the content of suspended matter entering the regulation and storage sedimentation tank 5.

The water inlet 13 of the ecological filter is 0.2 meters higher than the water inlet 12 of the regulated storage sedimentation tank, and is connected to the water-storing ecological filter 6. Under heavy rain and continuous rainfall, a large amount of rainwater enters the water inlet gallery, which is used as the water inlet gallery. 1 When the internal water level reaches the position of the water inlet 13 of the ecological filter, the clean rainwater in the late raining period directly enters the water storage ecological filter 6 treatment system through the ecological filter water inlet 13 and before entering the water storage ecological filter 6, A horizontal grille 15 is provided at the water inlet 13 of the ecological filter to intercept larger solids and suspended matter.

The emergency overflow port 14 is 0.2 meters higher than the water inlet 13 of the ecological filter, and is directly connected to the surface water body through a pipeline. It is used to directly flow rainwater into the water body through the emergency overflow port 14 under heavy rain conditions, at the emergency overflow port 14 There is still a louvered diving wall 16 to intercept larger solids and suspended solids entering the water body.

The grill room 2 and the sewage pump room 3 will produce odor during operation. In this embodiment, a deodorizing room 4 is provided, and the exhaust gas is continuously drawn by a blower and purified in the exhaust gas treatment equipment in the deodorizing room 4. The proposed extraction volume: 3000m ³ /h, the gas exchange rate is 4 times per hour, and the odor is discharged through a 15m-high chimney on the roof after deodorization through a photochemical ionization ion deodorizing device, with the help of UVC-radiation catalytic reaction.

As shown in Figures 3-5, in order to ensure uniform and sufficient water inflow and backwashing, the storage and sedimentation tank 5 includes several corridors. In this embodiment, there are 8 corridors, each with a net width of one meter. Each corridor includes corridor entrance 56, diversion sedimentation system, clarification overflow weir, venting system and backwashing system. The corridor entrance 56 is located on the side wall of the entrance end of each corridor, and is communicated with the water inlet 12 of the storage and sedimentation tank. The clarification overflow weir is located on the wall opposite to the water inlet 12 of the regulation and storage sedimentation tank, and the lower edge of the clarification overflow weir is lower than the water inlet 12 of the regulation and storage sedimentation tank. The upper edge of the overflow weir is the overflow port 54 of the regulating and storage sedimentation tank and is higher than the water inlet 12 of the regulating and storage sedimentation tank. The combined sewage is accumulated and precipitated in the regulation and storage sedimentation tank 5, and then the clarified water is discharged into the water storage ecological filter 6 through the clarification overflow weir. The principle of setting the height of the clarification overflow outlet is to keep the residence time of the combined sewage in the storage tank at 0.5-1h to ensure that the combined sewage is fully precipitated.

The diversion sedimentation system includes a number of diversion plates 55. The diversion plates are installed obliquely 45° downward on the pool walls on both sides of each corridor to form a diversion sedimentation tank, and the diversion plates 55 on both sides of the pool walls are crossed. Lay out. The cross-arrangement can increase the circuitous flow path of sewage in the corridor, realize the lengthening of the sewage flow path in the pond under the condition of small pond capacity, and improve the static settlement effect of suspended solids in the sewage; the deflector 55 arranged diagonally downward is conducive to sedimentation in the pond. The suspended matter on the board slides into the bottom under the action of gravity, and then is removed by backwashing at the bottom.

The emptying system includes a drainage groove 57, an emptying gate 53, and an emptying pump station. The drainage groove 57 is located at the bottom of the pool on the side of the corridor entrance 56. The drainage groove 57 has a emptying gate 53 and is connected to the emptying pump station. , The emptying pump station is connected to the sewage treatment plant. After the rainfall stops or the sewage stays in the storage sedimentation tank 5 for more than 1 hour, the emptying gate 53 is opened, and the sewage in the storage sedimentation tank 5 is pumped to the sewage treatment plant for treatment. The bottom sediment is washed, and the washed sewage is discharged to the sewage treatment plant for treatment, and then the sedimentation combined sewage is re-accumulated.

The flushing system includes a flushing corridor 51, a water storage chamber 59 and a flushing valve 52. Each corridor is divided into a flushing corridor 51 and a water storage chamber 59 by a baffle 58. The flushing corridor 51 is connected to the water inlet 12 of the regulation and storage sedimentation tank. Each flushing corridor 51 has a water storage chamber 59 at the rear. The water baffle 58 is fixed at the bottom of the pool and has a flush valve 52, and the height of the water baffle 58 is one-two of the height of the pool body. In the continuous water intake stage, the sewage crosses the baffle 58 and enters the water storage chamber 59. After the storage sedimentation tank 5 is emptied, the flush valve 52 on the baffle 58 in each corridor is opened, and the sewage in the water storage chamber 59 passes through The slope at the bottom of the pool body generates impulsive force to form a reverse flushing water flow from the water storage chamber 59 to the flushing corridor 51 and the drainage groove 57 to realize the backwashing of the suspended solids deposited on the bottom of the pool body. After that, the water accumulated in the water storage room 59 is backwashed to adjust the sedimentation tank 5, and then the sedimentation combined sewage is accumulated again.

As shown in Figure 6, the purification system of the water storage ecological filter 6 from bottom to top is a sand filter layer 69, a functional matrix layer 68, and a plant planting layer 67. The functional matrix layer 68 and the sand filter layer 69 are collectively referred to as fillers. The height of the filling layer is 1.0 meters. The functional matrix layer 68 is filled with pyrite and biomass charcoal with a thickness of 30cm and a particle size of about 100 meshes at a ratio of 1:1; the sand filter layer 69 is filled with medium sand with a thickness of 70cm and a particle size of 0.2-0.6mm, of which 0.25-0.5mm The particle size filter sand accounts for >50%. The planting layer 67 includes a submerged plant layer and an emergent plant layer. In order to ensure that the filter has a large water storage capacity, the layer height is set to 0.8 meters. The emergent plants choose reeds with higher stems, and the planting density is per square meter. 6 plants.

The water storage type ecological filter includes a water distribution system and a drainage system. The water distribution system includes a main water distribution corridor 61, a water distribution pipe 62, and a water distribution well 63. The main water distribution corridor 61 is a structure with a height difference and is arranged along the sideline and diagonal line of the pool body. The main water distribution corridor The upper part is respectively connected with the clarification overflow outlet 54 of the regulation and storage sedimentation tank and the ecological filter inlet 13 of the water inlet gallery, so that the overflow water of the regulation and storage sedimentation tank 5 and the water inlet gallery 1 first enters the main water distribution gallery 61, A plurality of water distribution pipes 62 are set close to the main water distribution corridor 61, and the water distribution pipes 62 are arranged at the deep bottom of the pool along both sides of the main water distribution corridor; A water distribution well 63, the water distribution well 63 and the main water distribution corridor 61 are connected by pipes, and then the water flow is evenly distributed through 30 water distribution pipes 62, each of which is responsible for the percolation of a ^{25m 2 filter bed.}

The drainage system includes a drainage gallery, a collection well 64, a rainwater pump house 65 and an ecological filter emergency overflow 66. In this embodiment, the ecological filter drainage system is provided with a collection well 64, which is first laid horizontally in the functional The perforated filter tube 681 at the bottom of the matrix layer 68 collects water, and the end of the perforated filter tube 681 is provided with a 45° elbow and a PVC-U pipe fitting extending upwards above the liquid level, and an air inlet is set on the upper part as a filter perforated filter tube The rainwater collected by the perforated filter tube 681 is discharged into the collection well 64 through the ventilation pipe of 681. The collection well 64 is connected to the rainwater pump house 65 through the drainage gallery. The rainwater in the filter is purified by the filter and passes through the rainwater pump house. The rainwater pump is pumped to the surface water body. There is an ecological filter emergency overflow outlet 66 on the upper part of the ecological filter, so that when the water collection well is not drained smoothly under heavy rain conditions, the water storage type ecological filter 6 also flows to the surface water through the emergency overflow of the ecological filter. Of drainage.

The filter tank is designed with a water depth of 1m and has a certain water storage capacity. A level controller 7 is set at a water depth of 1m. When the water storage height reaches 1m, the rainwater pump in the rainwater pump house 65 is turned on to discharge rainwater to the surface water body. When the water storage height reaches 1.5m, it overflows directly to the surface water body through the emergency overflow outlet 66 of the ecological filter.

The ecological filter drainage is lifted by a submersible sewage pump and discharged into the surface water body in the form of stream drainage, and the submersible sewage pump is installed in an automatic coupling installation. There are two submersible sewage pumps in total. The design flow rate of the pump is Q=200L/s, the design head is H=9.0m, and N=38kW. The submersible pump adopts frequency conversion control.

Example 2

Experiments were carried out on the treatment of mixed rain and sewage in Yueyang City. Experiments were carried out in the areas surrounding the three major lakes of Yueyang where there is rain and sewage combined overflow pollution, and the above-mentioned storage and purification system to control rain and sewage combined overflow pollution was built.

The original structure consists of a combined drainage pipe, a sewage pumping station of a sewage treatment plant, and a simple storage pond. The simple storage pond is an open-air pond, which only serves as a temporary storage for the combined sewage in the rainy season. Since the sewage is not classified and classified, the tank has a large capacity of 2000m ³ . When the rainy season comes, all the combined sewage that exceeds the processing capacity of the sewage pumping station will flow into the storage pond. After the rain stops, the sewage in the storage pond will be pumped into the sewage treatment plant. Due to the large amount of water, the sewage in the storage pond stays for a long time In addition, the bottom of the storage pond is prone to silt deposition, and the manual dredging works are low in volume and frequency, which causes the sewage in the storage pond to easily become black and smelly.

Renovation construction:

1) The original combined drainage pipeline is transformed into a water inlet gallery with cascaded overflow outlets, that is, the side walls of the water inlet gallery have sewage pump station inlets, water inlets for regulating and storing sedimentation tanks, and water inlets from bottom to top. The water inlet and emergency overflow of the ecological filter lead to the sewage pumping station, the storage sedimentation tank, the water storage ecological filter and the natural water body respectively.

2) Reconstruct the original regulation and storage pond into the regulation and storage sedimentation tank and water storage type ecological filter in Example 1, that is, the regulation and storage sedimentation tank includes a diversion sedimentation system, a drainage system, a backwash system and a clarification overflow weir. The effluent from the overflow weir leads to the storage-type ecological filter; the storage-type ecological filter includes a water distribution system, a regular drainage system, and a purification system. After the transformation, the storage and sedimentation tank has a capacity of 400m ³ and the storage-type ecological filter has a capacity of 800m ³ .

3) According to the connection relationship of implementation 1, set up the connection between the water inlet gallery and the grid room, the sewage pumping station, the deodorizing room, the regulation and storage sedimentation tank and the water storage ecological filter.

The operation mode of the modified regulation storage purification system, that is, a regulation and storage purification method for controlling the combined overflow pollution of rain and sewage is as follows:

Sewage that flows in during sunny days, light rains and early rainfall is transported to the sewage pumping station through a pipeline connected to the sewage pumping station, and then transported to the sewage plant for treatment by the submersible pump and the existing pressure-bearing pipe. The lifting flow of the water pump is automatically adjusted according to the sewage inflow, so that the sewage can be continuously transported. A grille is installed in front of the water pump to protect the water pump. The grid slag is transported, dewatered and stored in the slag tank.

Under the condition of twice the combined sewage in rainy days, the high-polluting combined sewage lower than the inlet of the storage sedimentation tank is still discharged into the sewage plant for treatment; the water volume continues to rise to reach the combined sewage diluted by rainwater at the inlet of the storage sedimentation tank It flows into the rainwater storage and sedimentation tank and is trapped in this closed rainwater storage and sedimentation tank. Sewage flows into the regulation and storage sedimentation tank through the layered diving wall, which intercepts the larger grid slag and suspended matter in the sewage. After the rainfall is over, the sewage trapped in the storage sedimentation tank is pumped by the submersible pump and transported to the sewage treatment plant. The sediment is settled to the bottom of the tank through the interception of the regulation and storage sedimentation tank. The sediment is washed by the washing equipment and transported to the sewage treatment plant at the same time.

When long-term heavy rain and continuous rainfall events cause the rainwater storage sedimentation tank to be full, the sewage flows out according to the throttle flow and is transported to the water storage ecological filter. The purpose of throttling the outflow of water is so that the sediment can have enough time to settle and not be discharged to the water storage ecological filter. When the rainwater storage sedimentation tank is filled and the inflow of water exceeds the throttling flow from the rainwater storage sedimentation tank, the extra rainwater flows directly into the water storage ecological filter through the overflow.

In heavy rain, when the full state of the storage sedimentation tank and the continuous sewage inflow from the pipeline are greater than the sum of the sewage outflow flow of the storage sedimentation tank and the delivery volume of the sewage pumping station, it will lead to choking in the pipeline system. The water uses a heavy rainfall line, and the rainwater is directly discharged to the ecological filter through the ecological filter inlet on the water inlet corridor. The strongly diluted rain-sewage mixed sewage introduced into the water storage ecological filter flows through the sand filter layer, functional substrate layer, and plant layer from bottom to top in the ecological filter, and intercepts suspended matter and functional substrate layer through the sand filter layer. Adsorption-biological-plant combined purification treatment such as adsorption and degradation of pollutants and plant layer absorption of pollutants. When the water depth of the filter reaches 1m, it is pumped and discharged to the surface water body through a submersible pump. When the water storage depth of the water storage ecological filter reaches 1.5m and the water starts to choke, the choked water overflows to the surface water body through the natural slope.

As the rainwater storage and sedimentation tank needs to be evacuated and flushed regularly. In order to discharge the inflow exceeding the limit of the regulation and storage purification capacity of the regulation and storage sedimentation tank, an emergency overflow is planned to be installed in front of the rainwater regulation and storage sedimentation tank, and the larger grid in the sewage will be intercepted by the layered diving grid under the peak of heavy rain. The slag and suspended matter flow directly into the surface water body.

The system has been used for 1 year of operation and monitoring. The monitoring results show that the mixed overflow pollution of rain and sewage in the experimental area has been controlled. Under different rainy seasons and rainfall conditions, the concentration of pollutants in the sewage discharged into surface water bodies can be Keep COD＜30mg/L, TN＜1.5mg/L, NH ₃ -N＜1.5mg/L, TP＜0.3mg/L, that is, using the present invention provides a kind of regulation, storage and purification to control rain pollution combined overflow pollution The system can make the water quality indicators discharged into the surface water body from the rain-sewage combined drainage area can meet the requirements of Class IV water quality standards in the "Surface Water Environmental Quality Standard" (GB3838-2002).

In summary, compared to the previous introduction of all combined sewage into the storage pond, which caused the water body to become black and stinky, the storage and purification system of this embodiment to control the pollution of combined rain and sewage overflow is achieved by setting up water inlet corridors and regulating water bodies. Storage and sedimentation tanks and storage-type ecological filters, and set up inlets at different heights of the water intake corridor to form gradient lines for gradient treatment of the combined sewage, and discharge the high-polluting sewage into the sewage treatment plant in the early stage, while the low-polluting sewage After storage and sedimentation and subsequent purification and treatment in the storage-type ecological filter, it can be directly discharged into the water body, which reduces the operating load of the sewage treatment plant and avoids the problem of black odor caused by long-term storage of sewage in the storage tank; second , Only need to improve the end of the combined drainage pipeline, the construction period is short, and the construction difficulty is small; compared with the original simple storage pond, the existing storage sedimentation tank and water storage ecological filter tank body size is 0.6 times the original , The volume and floor space are smaller, and the pollution load discharged into the water body can be greatly reduced in a cost-effective manner under the condition of a limited storage volume.

Claims

A regulation, storage and purification system for controlling combined overflow pollution of rain and sewage, which is characterized in that it comprises a water inlet gallery, a sewage pumping station, a regulation and storage sedimentation tank, and a water storage ecological filter. The water inlet gallery is included in the The sewage pumping station water inlet, the water inlet of the regulation and storage sedimentation tank, the water inlet of the water storage ecological filter tank and the emergency overflow on the water inlet corridor have the same height as the water storage ecological filter. The regulation and storage sedimentation tank clarifies the overflow outlet connected to the tank to form a gradient line for the sub-gradient treatment of combined overflow sewage. The gradient line includes no rain or low rainfall line, medium rainfall line, and long-term continuous moderate rain line , Heavy rainfall lines and heavy rain lines;

The rain-free or low-rainfall line sequentially includes a water inlet gallery, a sewage pumping station inlet, and a sewage pumping station, and the sewage pumping station is connected to the sewage treatment plant;

The medium rainfall line includes the no-rain or low-rainfall line, and also includes a pipeline formed by the water inlet gallery, the water inlet of the regulating and storing sedimentation tank, the diversion and sedimentation system in the regulating and storing sedimentation tank, the venting system and the backwashing system, Both the emptying system and the backwashing system of the regulating and storing sedimentation tank are connected to the sewage treatment plant;

The long-term continuous moderate rain line includes the no-rain or light-rainfall line and the medium-rainfall line, and also includes the overflow outlet clarified by the regulation and storage sedimentation tank, the water distribution system of the water storage type ecological filter, and the purification system , The pipeline formed by the automatic oxygenation system and the drainage system, the drainage system leading to the natural water body;

The heavy rainfall line includes the no rain or light rainfall line, the medium rainfall line and the long-term continuous moderate rain line, and also includes the water inlet of the water storage type ecological filter on the water intake corridor, and the water storage type ecological filter The pipelines formed by the water distribution system, purification system, automatic oxygenation system and drainage system of which lead to natural water bodies;

The rainstorm line includes the no rain or light rain line, the medium rain line, the long-term continuous medium rain line and the heavy rain line, and also includes the emergency overflow formed by the overflow from the water inlet gallery to the natural water body Pipeline.
The regulation, storage and purification system for controlling rain and sewage combined overflow pollution according to claim 1, wherein the bottom elevation of the water inlet of the sewage pumping station is flush with the bottom of the water inlet gallery; The height of the liquid level in the water inlet gallery from the bottom of the water inlet gallery is H 0 , and the setting height of the water inlet of the regulation and storage sedimentation tank in the water inlet gallery is H 0 ～2H 0 ; the water storage ecological filter tank The installation height of the water inlet in the water inlet gallery is 2H 0 ～3H 0 ; the installation height of the emergency overflow in the water inlet gallery is 3H 0 ～4H 0 .
The regulation, storage and purification system for controlling rain-sewage combined overflow pollution according to claim 1, wherein the water storage ecological filter includes a sand filter layer, a functional substrate layer, and a plant planting layer from bottom to top. The sewage flows through the filter from bottom to top to form the purification system of the water storage ecological filter;

The sand filter layer adopts medium sand with a particle size of 0.2-0.6mm, of which filter sand with a particle size of 0.25-0.5mm accounts for >50%, and the filling height of the sand filter layer is 0.7-1.3 meters;

The functional matrix layer uses pyrite and biomass charcoal with a particle size of 80-100 mesh, and a filling ratio of 2:1-1:2. The formation includes iron-carbon micro-electrolytic oxidation of organic matter, pyrite autotrophic denitrification and denitrification. The multi-functional matrix layer for nitrogen and biomass charcoal to adsorb nitrogen and phosphorus, and the filling height of the functional matrix layer is 0.3-0.5 meters;

The total height of the functional matrix layer and the sand filter layer is 0.8-1.2m;

The plant planting layer includes a submerged plant layer and an emergent plant layer, with a layer height of 0.5-1.1 meters, the emergent plants are selected to tolerate flooding, and the planting density is 3-9 plants per square meter.
The regulation, storage and purification system for controlling rain and sewage combined overflow pollution according to any one of claims 1-3, wherein the water distribution system of the water storage ecological filter includes a main water distribution corridor, a water distribution well, and a distribution system. water pipe;

The main water distribution corridor is a structure with a height difference, and is arranged along the sideline and diagonal line of the regulation and storage type ecological filter tank. The water inlet of the water storage ecological filter on the water inlet gallery is connected, and the bottom of the main water distribution gallery is respectively connected with a water distribution pipe and a water distribution well located inside the pool body for water intake;

There are multiple water distribution pipes, which are arranged at the deep bottom of the pool body along the main water distribution gallery. A number of water distribution pipes are arranged radially around.
The regulation, storage and purification system for controlling rain and sewage combined overflow pollution according to claim 4, characterized in that the drainage system of the water storage ecological filter includes a drainage gallery, a collection well, a perforated filter tube, and a rainwater pump Emergency overflow of housing and water storage ecological filter;

The perforated filter pipe is laid horizontally in the functional matrix layer and connected to the water collection well for draining the collected rainwater into the water collection well, the water collection well is connected to the drainage gallery, and the drainage gallery is connected to The rainwater pump house is connected by a drainage pipe, and the rainwater pump house leads to surface water;

The upper part of the ecological filter and higher than the water collection well has an emergency overflow of the ecological filter leading to the surface water.
The regulation, storage and purification system for controlling rain and sewage combined overflow pollution according to claim 1, wherein the regulation and storage sedimentation tank includes a plurality of parallel corridors, and each of the corridors includes a corridor. Inlet, diversion sedimentation system, vent system, backwash system and clarification overflow weir;

The entrance of the corridor is located on the side wall of the entrance of each of the corridors, and is connected to the water inlet of the sedimentation tank of the regulation and storage tank, and the clarification overflow weir is located on the opposite side of the water inlet of the regulation and storage sedimentation tank. On the side of the pool wall, the height of the lower edge of the clarification overflow weir is the same as the height of the water inlet of the regulation and storage tank, and the upper edge of the clarification overflow weir is the clarification overflow outlet of the regulation and storage sedimentation tank;

The diversion sedimentation system includes a plurality of diversion plates, and the diversion plates are arranged diagonally downward and crosswise on both sides of the pool walls of each of the corridors to form a diversion sedimentation tank;

The emptying system includes a drainage tank, an emptying pump station, and a gate. The drainage tank is located at the bottom of the pool body close to the entrance of the corridor. The drainage tank has a gate and is connected to an emptying pumping station. Connect to sewage treatment plant;

The backwashing system includes a water baffle and a flush valve, the water baffle is located at the end of each corridor and is fixed at the bottom of the pool, and the height of the water baffle is 1/3 of the height of the pool body ~2/3, the corridor is divided by the water baffle into a flushing corridor between the entrance of the corridor and the water baffle, and a water storage chamber between the water baffle and the clarification overflow weir, the The flushing corridor has a drainage groove, the bottom of the water storage chamber has a slope that decreases from the side wall of the pool body to the water baffle, and the water baffle is provided with a flushing valve, which forms when the flushing valve is opened. The reverse flushing water flow from the water storage chamber to the flushing corridor and the drainage groove.
The regulation, storage and purification system for controlling rain and sewage combined overflow pollution according to claim 1, characterized in that it comprises a grid room and a submersible louver wall, and the grid room is located between the water inlet of the sewage pump station and the sewage pump. Between the stations, the diving louver walls are distributed at the water inlet of the regulation and storage sedimentation tank, the water inlet of the water storage ecological filter and the overflow.
The regulation, storage and purification system for controlling rain and sewage combined overflow pollution according to claim 7, characterized in that it comprises a blower and a deodorizing room, the grill room and the sewage pumping station both have the blower, and the blower The exhaust air leads to the deodorizing room, and the deodorizing room is equipped with a deodorizing device.
A regulation, storage and purification method for controlling combined rain and sewage overflow pollution, which is characterized in that the regulation, storage and purification system for controlling combined rain and sewage overflow pollution according to any one of claims 1-8 is used to control the amount of domestic sewage and Surface runoff is treated in gradients to treat combined overflow sewage during rainfall, specifically as follows:

(1) When it is sunny, the line with no rain or light rainfall is adopted. The sewage in the receiving area flows into the sewage pumping station from the water intake gallery through the sewage pumping station inlet, and then is transported to the sewage treatment plant by submersible pumps and pressure pipes ；

(2) In light rain or in the early stage of rainfall, that is, when the flow of mixed rain and sewage is less than twice the flow of sewage in a sunny day, pipelines and inlet corridors can still provide a certain amount of water storage space. When the water storage height is lower than the storage sedimentation tank At the height of the water inlet, the rain-free or low-rainfall line is adopted, and the mixed sewage with high concentration of rain and sewage flows into the sewage pump station through the sewage pump station inlet, and then is sent to the sewage treatment plant by the submersible pump for treatment;

(3) On a moderately rainy day, that is, when the mixed flow of rain and sewage exceeds twice the flow of sunny sewage, the combined sewage diluted by rainwater will accumulate in a large amount in the water inlet corridor. When the mixed sewage is stored to the height of the water inlet of the storage sedimentation tank At the time, the medium rainfall line is used to flow into the regulation and storage sedimentation tank through the inlet of the regulation and storage sedimentation tank and be trapped in this closed rainwater regulation and storage sedimentation tank. Extract and transport to the sewage treatment plant;

(4) When the rainwater regulation and storage sedimentation tank is filled with continuous moderate rain for a long time, the long-term continuous moderate rain line shall be adopted. After the sewage is settled and clarified in the regulation and storage sedimentation tank, the sewage flows out through the clarification overflow outlet of the regulation and storage sedimentation tank and is transported. In the water-storing ecological filter, when the filling layer of the water-storing ecological filter is saturated and starts to hold water, the rainwater pump is turned on to discharge rainwater into the surface water body;

(5) On a heavy rainy day, when the regulation and storage sedimentation tank is full, and the continuous sewage inflow from the pipeline is greater than the sum of the sewage outflow flow of the regulation and storage sedimentation tank and the transportation volume of the sewage pumping station, the large Rainfall line, the rainwater is directly discharged to the water storage ecological filter through the water storage ecological filter inlet on the water intake corridor, and is discharged to the water body after purification treatment by the water storage ecological filter;

(6) In the case of heavy rain, a heavy rain line is adopted. When the amount of rainwater reaches the height of the emergency overflow in the water inlet gallery, the rainwater is directly discharged into the surface water body through the emergency overflow and the drainage ditch.
The regulation, storage and purification method for controlling rain and sewage combined overflow pollution according to claim 9, characterized in that the process of sewage flowing through the water storage ecological filter is as follows:

The overflow water of the storage tank and/or the overflow water of the inlet gallery is introduced into the main water distribution gallery through the upper part of the main water distribution gallery, falls to the bottom of the main water distribution gallery by gravity, and then flows into the deep bottom of the water storage ecological filter. In the water distribution pipe, sewage is introduced from the bottom of the water storage ecological filter into the tank body, and then the sewage flows through the sand filter layer, the functional substrate layer and the plant planting layer from bottom to top in the water storage ecological filter for purification After that, it is discharged through the emergency overflow outlet of the water collection well and/or the water storage ecological filter;

A level control gauge is installed at the storage depth of 1m in the water storage ecological filter, and the rainwater pump house of the drainage system is controlled by the level control gauge. When the water storage height reaches 1m, the rainwater pump in the rainwater pump house is turned on. The water in the collection well of the water storage type ecological filter is drained to the surface water body, thereby forming a vertical intermittent operation mode of the water storage type ecological filter, ensuring that the pores of the lower layer filter material are kept breathable and oxygenated; The emergency overflow of the water-type ecological filter is 1.5m higher than the surface of the filter material to ensure that the filter has a high water storage capacity. When the water storage height reaches 1.5m, the emergency overflow of the water-type ecological filter is directly Overflow to surface water bodies.