A quality-divided and zoned CSO storage and purification system and rainwater purification method

Abstract

The present invention discloses a quality-divided and zoned CSO regulating and purification system and a rainwater purification method. The system is divided into two layers, the lower layer includes an energy dissipation water distribution area, an enhanced sedimentation area, a fiber filler high-efficiency filtration area, a baffle purification area and an overflow area; the upper layer includes an energy dissipation water distribution area, a water storage area and an overflow area, wherein: the upper and lower layers share the energy dissipation water distribution area and the overflow area, and an overflow wall and a submersible sewage pump are arranged between the energy dissipation water distribution area and the overflow area; the energy dissipation water distribution area in the lower layer is connected to the enhanced sedimentation area, the enhanced sedimentation area is connected to the fiber filler high-efficiency filtration area through an overflow pipe, and the fiber filler high-efficiency filtration area is connected to the baffle purification area through a sewage pump; the water storage area in the upper layer is connected to the energy dissipation water distribution area through a drainage ditch. The present invention can realize sewage purification in the regulating and storage tank without the need for subsequent new enhanced treatment facilities, and can further realize the quality-divided and zoned storage of sewage, and realize the graded treatment of sewage with different pollutant concentrations, thereby improving the quality and efficiency of the CSO regulating and storage tank.

Description

Technical Field

[0001] The present invention relates to the technical field of rainwater treatment equipment, and in particular to a quality-divided and zoned CSO storage and purification system and a rainwater purification method. Background Art

[0002] Most cities and towns in my country use combined sewer systems, which carry a large amount of surface pollutants and urban sewage into rivers, lakes and other water bodies during rainy days, causing combined sewer overflow (CSO) pollution problems. Combined sewer overflow storage tanks are a type of combined sewage collection facility that covers a large area and can generally be built under urban public areas. Their main function is to temporarily store the peak flow of combined sewage, and then slowly discharge the rainwater from the storage tank after the maximum flow drops. It can not only avoid rainwater peaks, prevent urban waterlogging, and achieve rainwater recycling, but also avoid the pollution of the receiving water body by initial rainwater, and play a positive role in drainage scheduling between drainage areas.

[0003] Due to the current bad atmospheric environment and serious surface runoff pollution, the initial rainwater collected by the rainwater storage tank must be treated before discharge to prevent pollution of the receiving water body. Therefore, when building a CSO storage tank, it is often necessary to build related water treatment facilities, which increases the project cost. On the other hand, there is a large amount of space inside the CSO storage tank, which is only used to store rainwater and cannot be effectively used, resulting in a single function of the CSO storage tank and low economic benefits. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned shortcomings and provide a quality-divided and zoned CSO storage and purification system and a rainwater purification method.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A quality-divided and zoned CSO regulation and purification system is provided, which is divided into two layers, the lower layer includes an energy dissipation and water distribution area, an enhanced sedimentation area, a fiber filler high-efficiency filtration area, a baffle purification area and an overflow area; the upper layer includes an energy dissipation and water distribution area, a water storage area and an overflow area, wherein:

[0007] The upper layer and the lower layer share the energy dissipation water distribution area and the overflow area, and an overflow wall and a submersible sewage pump are arranged between the energy dissipation water distribution area and the overflow area;

[0008] In the lower layer, the energy dissipation and water distribution area is connected to the enhanced sedimentation area, the enhanced sedimentation area is connected to the fiber filler high-efficiency filtration area through an overflow pipe, and the fiber filler high-efficiency filtration area is connected to the baffle purification area through a sewage pump;

[0009] In the upper layer, the water storage area is connected to the energy dissipation and water distribution area through a drainage ditch.

[0010] According to the above scheme, the fiber packing high-efficiency filtration area is a tower filtration structure with three layers, and the filtration fineness of each layer increases from top to bottom; a water distributor is arranged on the top of each fiber packing filtration layer, the water distributor is connected to the overflow pipe, and a valve is arranged at the inlet section of the water distributor. A water collection tank is arranged at the bottom of the fiber packing high-efficiency filtration area, and the water collection tank is connected to the baffle purification area through a sewage pump;

[0011] The baffle purification area is divided into high, medium and low concentration sewage purification areas;

[0012] In the upper layer, the water storage area is divided into a high-concentration water storage chamber, a medium-concentration water storage chamber and a low-concentration water storage chamber, and is arranged from near to far according to the distance from the energy dissipation water distribution area and the overflow area.

[0013] With the above structure, when the water level in the energy dissipation water distribution area is higher than the starting water level but lower than the top elevation of the overflow wall, it enters the lower layer for water purification, and after three layers of filtration through the fiber filler high-efficiency filtration area, it enters the high, medium and low concentration sewage purification areas of the baffle purification area for purification; when the water level is higher than the top elevation of the overflow wall, the water in the energy dissipation water distribution area enters the overflow area through the overflow wall, and as the water volume continues to increase, it enters the high-concentration water storage chamber, medium-concentration water storage chamber and low-concentration water storage chamber of the upper layer in turn through the overflow area for storage, and the sewage stored in the upper layer then enters the lower layer for graded purification. The water in the energy dissipation water distribution area, overflow area and high-concentration water storage chamber is filtered through three layers of the lower fiber filler high-efficiency filtration area and then enters the high, medium and low concentration sewage purification area of ​​the baffle purification area for purification; the water in the medium-concentration water storage chamber is filtered through the lower two layers of the lower fiber filler high-efficiency filtration area and then enters the medium and low concentration sewage purification area of ​​the baffle purification area for purification; the water in the low-concentration water storage chamber is filtered through the bottom layer of the lower fiber filler high-efficiency filtration area and then enters the low concentration sewage purification area of ​​the baffle purification area for purification. The sewage is stored in different qualities and regions, and sewage with different pollutant concentrations is treated in stages, which reduces resource input and improves the quality and efficiency of the CSO storage tank.

[0014] According to the above scheme, the entrance of the high-concentration sewage purification area includes a high-concentration sewage valve, a high-concentration sewage agent inlet and a high-concentration sewage pump. The high-concentration sewage valve is located in front of the high-concentration sewage agent inlet, and the high-concentration sewage agent inlet is located in the suction pipe section of the high-concentration sewage pump; the medium-concentration sewage purification area includes a medium-concentration sewage valve, a medium-concentration sewage agent inlet, a medium-concentration sewage pump and a medium-concentration backflow prevention gate. The medium-concentration sewage valve is located in front of the medium-concentration sewage agent inlet, and the medium-concentration sewage agent inlet is located in the suction pipe section of the medium-concentration sewage pump. The water outlet is behind the medium-concentration anti-backflow gate. After the medium-concentration sewage pump is started, the medium-concentration anti-backflow gate is closed to prevent sewage from flowing back to the previous area; the low-concentration sewage purification area includes a low-concentration sewage valve, a low-concentration sewage agent inlet, a low-concentration sewage pump and a low-concentration anti-backflow gate. The low-concentration sewage valve is located in front of the low-concentration sewage agent inlet, the low-concentration sewage agent inlet is located at the suction pipe section of the low-concentration sewage pump, and the low-concentration sewage pump outlet is behind the low-concentration anti-backflow gate; a stable outflow area is set at the end of the baffle purification area, and the sewage is discharged through the stable outflow area.

[0015] According to the above scheme, a reciprocating partition is set in the baffle purification area to form a narrow and long rotating corridor. The water flows in a zigzag manner in the corridor. When the water flow turns, a stirring effect is generated, which increases the reaction time between sewage and chemicals.

[0016] According to the above scheme, the slope of each area of ​​the water storage chamber is 0.8-1.0%, the elevation close to the drainage ditch is lower than the height of the water storage area, the drainage ditch is set on the lower side of the foot of the water storage chamber, with a slope of 0.8-1.0%, and is used as a water transfer channel for the water storage area. The high-concentration water storage chamber, medium-concentration water storage chamber and low-concentration water storage chamber are provided with gates at the outlets of the drainage ditch, which can be used to adjust the outflow flow rate.

[0017] According to the above scheme, the energy dissipation and water distribution area includes a grille front pool, a coarse grille and an energy dissipation sill; the grille front pool has a certain slope in the longitudinal direction, and the plane layout is a trapezoid with a slope of 0.6% to 1.0%; the coarse grille gap is set to 20mm to 30mm; the energy dissipation sill adopts step energy dissipation with a slope of 30° to 35°, and the step width / step height ≥1.5; at the water outlet of the energy dissipation and water distribution area, a uniform water diversion flower wall is arranged, and the uniform water diversion flower wall consists of two elliptical hole water flower walls.

[0018] According to the above scheme, the enhanced sedimentation tank adopts horizontal flow type, and is equipped with a single bucket for mud discharge, with a length-to-width ratio of not less than 4 and a water depth of not less than 4m; the bottom slope is taken as 0.9-1.2%, sloping from the outlet to the single bucket, and a gate-type flushing device is adopted at the end, and the gate-type flushing device adopts a hydraulic downward-opening weir gate.

[0019] With the above structure, a slope is set at the bottom to facilitate sand discharge, a single bucket mud discharge is used to collect settled sludge, and a gate-type flushing device adopts a hydraulic bottom-opening weir gate to flush the sludge at the bottom of the sedimentation tank. In addition, the use of the hydraulic bottom-opening weir gate makes full use of the underground space of the CSO.

[0020] According to the above scheme, the fiber filler is used as the filter material in the fiber filler high-efficiency filtration zone. The fiber filler is woven into bundles with fiber materials, and the porosity is above 93%. The fiber material is at least one of nylon, vinylon, acrylic fiber and polyester.

[0021] According to the above scheme, the height of each layer in the tower filtration structure is 1.5 to 3 meters.

[0022] According to the above scheme, the tower filter structure is assembled using a material frame and installed with a frame, which is convenient for installation and maintenance.

[0023] By adopting the above structure, the fiber filler has a high porosity and occupies less CSO storage space, which basically does not affect the water storage function of CSO; the characteristics of CSO with large space and deep depth are fully utilized to realize the layered tower filtration structure for layered treatment of different water qualities. Wastewater with high concentration of pollutants is treated in three layers, wastewater with medium concentration of pollutants is treated in the upper double layers, and wastewater with low concentration of pollutants is treated in the bottom single layer.

[0024] According to the above scheme, there are two enhanced sedimentation areas, two fiber filler high-efficiency filtration areas and two baffle purification areas, which are symmetrically arranged on both sides of the energy dissipation and water distribution area and the overflow area.

[0025] According to the above scheme, in the upper layer, the number of high-concentration water storage chambers, medium-concentration water storage chambers and low-concentration water storage chambers are all 4, and they are arranged in groups of two on both sides of the energy dissipation water distribution area and the overflow area.

[0026] A method for purifying rainwater using the above-mentioned quality-divided and zoned CSO storage and purification system is provided, and the specific operation is as follows:

[0027] S01, when the CSO storage and purification system starts water level h 启动 When the sewage water level in the energy dissipation water distribution pool is less than the top elevation of the overflow wall h0 and no overflow occurs (N=0, N represents the number of overflows through the overflow wall), the sewage is purified in the lower layer of the storage and purification system, and the sewage enters the enhanced sedimentation tank from the energy dissipation water distribution area for mud sedimentation, and then passes through the three-layer filtration of the fiber filler high-efficiency filtration area and enters the high, medium and low concentration sewage purification area of ​​the baffle purification area for purification;

[0028] S02, when h=h0, N=1, the water depth in the overflow area is H 溢流区> 0, if the external sewage volume Q> system external discharge flow Q1, the submersible sewage pump between the energy dissipation water distribution area and the overflow area will not be started, and the upper layer of the purification system will play a water storage function; if the external sewage volume Q< system external discharge flow Q1, the submersible sewage pump between the energy dissipation water distribution area and the overflow area will be started, and the water in the overflow area will be introduced into the energy dissipation water distribution area and then purified. The flow Q2 = Q1-Q, and the sewage is purified according to the steps in S01;

[0029] S03. When h=h0, N=1, H 溢流区 =0, water depth of high concentration sewage storage chamber h 高蓄 >0, water depth of medium concentration sewage storage chamber h 中蓄 ≥0, the sewage in the high-concentration water storage chamber flows into the energy dissipation water distribution area through the drainage ditch, and the flow rate q 高 =Q1-Q (Q<Q1) or 0 (Q>Q1), the sewage is purified according to the steps in S01;

[0030] S04, when h=h0, N=1, H 溢流区 =0,H 高蓄 =0,H 中蓄 >0,H 低蓄 ≥0, the sewage in the medium concentration water storage chamber flows into the energy dissipation water distribution area through the drainage ditch, and the flow rate q 中 =Q1-Q (Q<Q1) or 0 (Q>Q1), the sewage enters the enhanced sedimentation tank from the energy dissipation and water distribution area for mud sedimentation, and then passes through the two layers below the fiber filler high-efficiency filtration area, and after filtration, enters the medium and low concentration sewage purification area of ​​the baffle purification area for purification;

[0031] S05, when h=h0, N=1, H 溢流区 =0,H 高蓄 =0,H 中蓄 =0,H 低蓄 ≥0, the sewage in the low-concentration water storage chamber flows into the energy dissipation water distribution area through the drainage ditch, and the flow rate q 低 =Q1-Q (Q<Q1) or 0 (Q>Q1), the sewage enters the enhanced sedimentation tank from the energy dissipation and water distribution area for sludge sedimentation, and then passes through the last layer of filtration in the fiber filler high-efficiency filtration area and enters the low-concentration sewage purification area of ​​the baffle purification area for purification;

[0032] S06, when h=h0, H 溢流区 , H 高蓄 , H 中蓄 and H 低蓄 When both reach the maximum value, the system water storage capacity reaches the maximum, and the sewage inlet of the energy dissipation and water distribution area is closed.

[0033] According to the above scheme, in S01, the sewage is purified in the lower layer of the regulation and storage system, and the sewage flows from the energy dissipation water distribution area into the enhanced sedimentation tank for sludge sedimentation; the sewage valve of the first filter layer is opened, and the sewage flows from the enhanced sedimentation area through the overflow pipe into the first fiber filler filter layer water distributor connected to it, enters the first fiber filler filter layer through the water distributor, and enters the water collection tank at the bottom of the fiber filler high-efficiency filtration area after three layers of filtration from top to bottom; the high-concentration sewage valve at the entrance of the high-concentration sewage purification area is opened, and the sewage is pumped from the water collection tank at the bottom of the fiber filler high-efficiency filtration area to the high-concentration baffle purification area through the high-concentration sewage pump, and then passes through the medium-concentration and low-concentration baffle purification areas in turn. After purification treatment in the high, medium and low concentration baffle purification areas, it flows to the stable outflow area.

[0034] According to the above scheme, in S04, sewage flows from the energy dissipation water distribution area into the enhanced sedimentation tank for sludge sedimentation, the second filter layer sewage valve is opened, and flows from the enhanced sedimentation area through the overflow pipe into the second fiber filler filter layer water distributor connected to it, enters the second fiber filler filter layer through the water distributor, and enters the water collection tank at the bottom of the fiber filler high-efficiency filtration area after two layers of filtration from top to bottom; the medium-concentration sewage valve at the entrance of the medium-concentration sewage purification area is opened, and the sewage is pumped from the water collection tank at the bottom of the fiber filler high-efficiency filtration area to the medium-concentration baffle purification area through the medium-concentration sewage pump. At the same time, when the medium-concentration sewage pump is turned on, the medium-concentration anti-backflow gate located in front of the medium-concentration sewage pump outlet is closed to prevent sewage from flowing back to the previous area, and then passes through the low-concentration baffle purification area, and after purification treatment in the medium and low-concentration baffle purification areas, it flows to the stable outflow area.

[0035] According to the above scheme, in S05, the sewage flows from the energy dissipation water distribution area into the enhanced sedimentation tank by gravity for sludge sedimentation, the valve of the third fiber filler filter layer water distributor is opened, and the sewage flows from the enhanced sedimentation area through the overflow pipe into the third fiber filler filter layer water distributor connected to it, enters the third fiber filler filter layer through the water distributor, and enters the water collection tank at the bottom of the fiber filler high-efficiency filtration area after the last layer of filtration; the low-concentration sewage valve at the entrance of the low-concentration sewage purification area is opened, and the sewage is pumped from the water collection tank at the bottom of the fiber filler high-efficiency filtration area to the low-concentration baffle purification area through the low-concentration sewage pump. At the same time, when the low-concentration sewage pump is turned on, the low-concentration backflow prevention gate located in front of the low-concentration sewage pump outlet is closed to prevent the sewage from flowing back to the previous area. After purification in the low-concentration baffle purification area, it flows to the stable outflow area for outflow.

[0036] The beneficial effects of the present invention are:

[0037] 1. The CSO regulating and purification system provided by the present invention has a two-layer structure, the upper layer is used for water storage, and the lower layer is used for sewage purification. It can realize sewage purification in the regulating and storage tank without the need for subsequent new enhanced treatment facilities.

[0038] 2. By setting up three filter layers with different filtration finenesses in the fiber filler high-efficiency filtration area and a baffle purification area for treating three different concentrations, based on the characteristics of high pollutant concentration in the early stage and low pollutant concentration in the later stage of rainfall projects, it is possible to store sewage in different qualities and regions, conduct graded treatment of sewage with different pollutant concentrations, reduce resource input, and improve the quality and efficiency of the CSO storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a functional zoning diagram of the lower layer of the quality-divided and zoned CSO purification and storage system in an embodiment of the present invention.

[0040] Figure 2 This is the upper functional zoning diagram of the quality-divided and zoned CSO purification and storage system in the embodiment of the present invention.

[0041] Figure 3 It is a transverse cross-sectional view of the quality-divided and zoned CSO purification and storage system in an embodiment of the present invention, with the left side being a cross-sectional view of the inlet area and the right side being a cross-sectional view of the outlet area.

[0042] Figure 4 It is a classification diagram of the baffle purification zones in the quality-divided and zoned CSO purification and storage system in an embodiment of the present invention.

[0043] Figure 5 It is a detailed diagram of the drainage ditch of the regulating reservoir of the quality-divided and zoned CSO purification and regulation system in an embodiment of the present invention.

[0044] Among them, the numbers in the figure are:

[0045] 1—energy dissipation and water distribution area, 2—enhanced sedimentation area, 3—fiber filler high-efficiency filtration, 4—baffle purification area, 5—stable outflow area, 6—water storage area, 7—overflow area, 11—grid front pool area, 12—coarse grid area, 13—energy dissipation sill, 14—uniform water diversion flower wall, 21—overflow pipe, 31—water distributor, 37—first fiber filler filter layer, 32—second fiber filler filter layer, 33—third fiber filler filter layer, 34—first filter layer sewage valve, 35—second filter layer sewage valve, 36—third filter layer sewage valve, 41—high concentration baffle purification area, 42—medium concentration baffle purification area, 43—low concentration baffle purification area, 44—partition, 411—high concentration Sewage valve, 412—high-concentration sewage agent inlet, 413—high-concentration sewage pump, 421—medium-concentration sewage valve, 422—medium-concentration sewage agent inlet, 423—medium-concentration sewage pump, 424—medium-concentration backflow prevention gate, 431—low-concentration sewage valve, 432—low-concentration sewage agent inlet, 433—low-concentration sewage pump, 434—low-concentration backflow prevention gate, 51—sewage pump in stable treatment area, 61, 62—high-concentration water storage chamber, 611—high-concentration water storage chamber outlet gate, 63, 64—medium-concentration water storage chamber, 631—medium-concentration water storage chamber outlet gate, 651—low-concentration water storage chamber outlet gate, 65, 66—low-concentration water storage chamber, 71—submersible sewage pump, 72—overflow wall. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0047] like Figure 1-3 As shown, the embodiment of the present invention provides a quality-divided and zoned CSO regulation and purification system for combined sewage overflow pollution (CSO), which is divided into two layers, the lower layer includes an energy dissipation and water distribution area 1, an enhanced sedimentation area 2, a fiber filler high-efficiency filtration area 3, a baffle purification area 4 and an overflow area 7; the upper layer includes an energy dissipation and water distribution area 1, a water storage area 6 and an overflow area 7, wherein:

[0048] The upper layer and the lower layer share the energy dissipation water distribution area 1 and the overflow area 7, and an overflow wall 72 and a submersible sewage pump 71 are arranged between the energy dissipation water distribution area 1 and the overflow area 7;

[0049] In the lower layer, the energy dissipation and water distribution area 1 is connected to the enhanced sedimentation area 2, the enhanced sedimentation area 2 is connected to the fiber filler high-efficiency filtration area 3 through an overflow pipe 21, and the fiber filler high-efficiency filtration area 3 is connected to the baffle purification area 4 through a sewage pump;

[0050] In the upper layer, the water storage area 6 is connected to the energy dissipation water distribution area 1 through a drainage ditch.

[0051] In one embodiment, the fiber filler high-efficiency filtration area 3 is a tower filtration structure, with three fiber filler filtration layers 37, 32, and 33, and the filtration fineness of each layer increases from top to bottom; a water distributor 31 is arranged on the top of each fiber filler filtration layer, and the water distributor 31 is connected to the overflow pipe 21, and valves 34, 35, and 36 are arranged at the inlet section of the water distributor 31. A water collection tank is arranged at the bottom of the fiber filler high-efficiency filtration area 3, and the water collection tank is connected to the baffle purification area 4 through a sewage pump;

[0052] The baffle purification area 4 is divided into a high-concentration sewage purification area 41, a medium-concentration sewage purification area 42 and a low-concentration sewage purification area 43;

[0053] In the upper layer, the water storage area 6 is divided into high-concentration water storage chambers 61 , 62 , medium-concentration water storage chambers 63 , 64 and low-concentration water storage chambers 65 , 66 , and are arranged from near to far according to the distance from the energy dissipation water distribution area 1 and the overflow area 7 .

[0054] With the above structure, when the water level in the energy dissipation water distribution area 1 is higher than the starting water level but lower than the top elevation of the overflow wall 72, it enters the lower layer for water purification, and after three-layer filtration through the fiber filler high-efficiency filtration area 3, it enters the high, medium and low concentration sewage purification areas 41, 42, 43 of the baffle purification area for purification; when the water level is higher than the top elevation of the overflow wall 72, the water in the energy dissipation water distribution area 1 enters the overflow area 7 through the overflow wall 72, and as the amount of water continues to increase, it enters the high-concentration water storage chambers 61, 62, medium-concentration water storage chambers 63, 64 and low-concentration water storage chambers 65, 66 of the upper layer in turn through the overflow area 7 for storage, and the sewage stored in the upper layer then enters the lower layer for graded purification. The water in the energy dissipation water distribution area 1, the overflow area 7 and the high-concentration water storage chambers 61 and 62 is filtered through three layers of the lower fiber filler high-efficiency filtration area 3 and then enters the high, medium and low concentration sewage purification areas 41, 42 and 43 of the baffle purification area for purification; the water in the medium-concentration water storage chambers 63 and 64 is filtered through the upper two layers of the lower fiber filler high-efficiency filtration area 3 and then enters the medium and low concentration sewage purification areas 42 and 43 of the baffle purification area 4 for purification; the water in the low-concentration water storage chambers 65 and 66 is filtered through the bottom layer of the lower fiber filler high-efficiency filtration area 3 and then enters the low-concentration sewage purification area 43 of the baffle purification area 4 for purification. The sewage is stored in different qualities and regions, and sewage with different pollutant concentrations is treated in stages, which reduces resource input and improves the quality and efficiency of the CSO storage tank.

[0055] In one embodiment, Figure 4As shown, the entrance of the high-concentration sewage purification area 41 includes a high-concentration sewage valve 411, a high-concentration sewage agent inlet 412 and a high-concentration sewage pump 413. The high-concentration sewage valve 411 is located in front of the high-concentration sewage agent inlet 412 to control whether water is entering. The high-concentration sewage agent inlet 412 is located in the water suction pipe section of the high-concentration sewage pump 413. The high rotation of the impeller of the high-concentration sewage pump 413 achieves the purpose of rapid and intense mixing of the agent. The medium-concentration sewage purification area 42 includes a medium-concentration sewage valve 421, a medium-concentration sewage agent inlet 422, a medium-concentration sewage pump 423 and a medium-concentration backflow prevention gate 424. The medium-concentration sewage valve 421 is located in front of the medium-concentration sewage agent inlet 422. The medium-concentration sewage agent inlet 422 is located in the water suction pipe section of the medium-concentration sewage pump 423. The outlet of the medium-concentration sewage pump 423 is behind the medium-concentration backflow prevention gate 424. After the water pump is started, the gate is closed to prevent sewage from flowing back to the previous area. The low-concentration sewage purification area 43 includes a low-concentration sewage valve 431, a low-concentration sewage agent inlet 432, a low-concentration sewage pump 433 and a low-concentration backflow prevention gate 434. The low-concentration sewage valve 431 is located in front of the low-concentration sewage agent inlet 432, the low-concentration sewage agent inlet 432 is located in the suction pipe section of the low-concentration sewage pump 433, and the outlet of the low-concentration sewage pump 433 is behind the low-concentration backflow prevention gate 434; a stable outflow area 5 is set at the end of the deflection purification area 4, and the sewage is discharged through the sewage pump 51 in the stable outflow area 5.

[0056] In one embodiment, a reciprocating partition 44 is provided in the baffle purification area 4 to form a narrow and long rotating corridor. The water flows in a zigzag manner in the corridor. When the water flows in a different direction, a stirring effect is generated to increase the reaction time between the sewage and the reagent.

[0057] In one embodiment, the slope of each area of ​​the water storage chamber 6 is 1%. The elevation near the drainage ditch is lower than the height of the water storage area 6. The drainage ditch is set at the lower side of the foot of the water storage chamber 6, with a slope of 1%, and is used as a water delivery channel for the water storage chamber 6. Figure 5 As shown, a high-concentration water storage chamber outlet gate 611 is provided at the outlet of the high-concentration water storage chamber 61, 62, a medium-concentration water storage chamber outlet gate 631 is provided at the outlet of the medium-concentration water storage chamber 63, 64, and a low-concentration water storage chamber outlet gate 651 is provided at the outlet of the low-concentration water storage chamber 65, 66, which can be used to adjust the outflow rate.

[0058] In one embodiment, the energy dissipation water distribution area 1 includes a grid forepool 11, a coarse grid 12 and an energy dissipation sill 13; the grid forepool 11 has a certain slope in the longitudinal direction, and the plane layout is a trapezoid, so that the water flow smoothly transitions to the coarse grid 12, maintaining a stable flow state, and the slope is 0.9%. The grid gap of the coarse grid 12 is set to 25mm, which can intercept grid residues larger than 25mm; the energy dissipation sill 13 adopts step energy dissipation, the slope is 33.69°, the step width / step height = 1.5, and the step is connected to the energy dissipation pool, and the overall energy dissipation rate is 70%. At the outlet of the energy dissipation water distribution area 1, a uniform water diversion flower wall 14 is arranged, and the uniform water diversion flower wall 14 is composed of two elliptical hole water distribution flower walls, and enters the enhanced sedimentation tank 2 through the uniform water diversion flower wall 14.

[0059] With the above structure, rainwater passes through the grid front pool to make the water flow smoothly transition to the coarse grid, maintaining a stable flow state. The coarse grid can intercept grid residues larger than 25 mm, and the overall energy dissipation rate of the energy dissipation ridge can reach 70%; after being treated in the energy dissipation water distribution area, there is basically no grid residue larger than 25 mm in the sewage; at the outlet of the energy dissipation water distribution area, a uniform water diversion flower wall is arranged, and the sewage in the energy dissipation water distribution area enters the enhanced sedimentation tank through the uniform water diversion flower wall, which is convenient for adjusting the flow profile flow velocity distribution, ensuring the subsequent stable flow state, and facilitating the subsequent sedimentation of solid particle suspended matter.

[0060] In one embodiment, the enhanced sedimentation tank 2 adopts a horizontal flow type, and a single bucket is set to discharge mud, with a length-to-width ratio of not less than 4 and a water depth of not less than 4m. At the same time, in order to facilitate sand discharge, the bottom slope is 0.9%, tilted from the outlet to the single bucket, and a gate-type flushing device is used at the end. Preferably, the gate-type flushing device adopts a hydraulic down-opening weir gate to make full use of the underground space of the CSO; the enhanced sedimentation tank 2 overflows to the fiber filler high-efficiency filtration area 3 through the overflow pipe.

[0061] With the above structure, a slope is set at the bottom to facilitate sand discharge, a single bucket mud discharge is used to collect settled sludge, and a gate-type flushing device adopts a hydraulic bottom-opening weir gate to flush the sludge at the bottom of the sedimentation tank. In addition, the use of the hydraulic bottom-opening weir gate makes full use of the underground space of the CSO.

[0062] In one embodiment, the fiber filler is used as the filter material in the fiber filler high-efficiency filter zone 3. The fiber filler is woven into bundles using at least one of nylon, vinylon, acrylic, and polyester fibers, and has a porosity of more than 93%.

[0063] In one embodiment, in the tower filter structure in the fiber filler high-efficiency filter zone 3, the height of each layer is 1.5 to 3 meters.

[0064] In one embodiment, the tower filter structure is assembled using a material frame and installed with a frame, which is convenient for installation and maintenance.

[0065] By adopting the above structure, the fiber filler has a high porosity and occupies less CSO storage space, which basically does not affect the water storage function of CSO; the characteristics of CSO with large space and deep depth are fully utilized to realize the layered tower filtration structure for layered treatment of different water qualities. Wastewater with high concentration of pollutants is treated in three layers, wastewater with medium concentration of pollutants is treated in the upper double layers, and wastewater with low concentration of pollutants is treated in the bottom single layer.

[0066] In one embodiment, two uniform water diversion flower walls are arranged in the stable outflow area 5 to ensure the stability of the water flow, and then the water is discharged through a water pump.

[0067] In one embodiment, the number of each of the enhanced sedimentation zone 2 , the fiber filler high-efficiency filtration zone 3 , the baffle purification zone 4 and the stable outflow zone 5 are two, and they are symmetrically arranged on both sides of the energy dissipation and water distribution zone 1 and the overflow zone 7 .

[0068] In one of the embodiments, in the upper layer, the number of high-concentration water storage chambers 61 , 62 , medium-concentration water storage chambers 63 , 64 and low-concentration water storage chambers 65 , 66 are all 4, which are arranged in groups of two on both sides of the energy dissipation water distribution area 1 and the overflow area 7 .

[0069] A method for purifying rainwater using the above-mentioned quality-divided and zoned CSO storage and purification system is provided, and the specific operation is as follows:

[0070] S01, when the CSO storage and purification system starts water level h 启动 When the sewage water level in the energy dissipation water distribution pool is less than the top elevation of the overflow wall h0 and no overflow occurs (N=0, N represents the number of overflows through the overflow wall), the sewage is purified in the lower layer of the storage and purification system, and the sewage enters the enhanced sedimentation tank 2 from the energy dissipation water distribution area 1 for mud sedimentation, and then enters the high, medium and low concentration sewage purification areas 41, 42 and 43 of the baffle purification area 4 for purification after three-layer filtration of the fiber filler high-efficiency filtration area 3;

[0071] S02, when h=h0, N=1, the water depth in the overflow area is H 溢流区 >0, if the amount of external sewage Q> the system external discharge flow Q1, the submersible sewage pump between the energy dissipation water distribution area 1 and the overflow area 7 will not be started, the upper layer of the purification system will play a water storage function, and the sewage in the energy dissipation water distribution area 1 will be purified according to the steps in S01; if the amount of external sewage Q<the system external discharge flow Q1, the submersible sewage pump 71 between the energy dissipation water distribution area 1 and the overflow area 7 will be started, the water in the overflow area 7 will be introduced into the energy dissipation water distribution area 1 and then purified, the submersible sewage pump is variable frequency, the flow Q2=Q1-Q, and the sewage will be purified according to the steps in S01;

[0072] S03. When h=h0, N=1, H 溢流区 =0, water depth of high concentration water storage chamber h 高蓄>0, water depth of medium concentration water storage chamber h 中蓄 ≥0, the high-concentration water storage chamber outlet gate 611 is opened, and the sewage flows into the energy dissipation water distribution area 1 through the drainage ditch, and the flow rate q 高 =Q1-Q (Q<Q1) or 0 (Q>Q1), the high-concentration sewage is purified according to the steps in S01;

[0073] S04, when h=h0, N=1, H 溢流区 =0,H 高蓄 =0,H 中蓄 >0,H 低蓄 ≥0, open the outlet gate 631 of the medium concentration water storage chamber, and the sewage flows into the energy dissipation water distribution area 1 through the drainage ditch, with a flow rate q 中 =Q1-Q (Q<Q1) or 0 (Q>Q1), the medium-concentration sewage enters the enhanced sedimentation tank 2 from the energy dissipation and water distribution area 1 for sludge sedimentation, and then passes through the two layers of filtration at the lower side of the fiber filler high-efficiency filtration area 3 and enters the medium- and low-concentration sewage purification areas 42 and 43 of the baffle purification area 4 for purification;

[0074] S05, when h=h0, N=1, H 溢流区 =0,H 高蓄 =0,H 中蓄 =0,H 低蓄 ≥0, open the low-concentration water storage chamber outlet gate 651, and the sewage flows into the energy dissipation water distribution area 1 through the drainage ditch, and the flow rate q 低 =Q1-Q (Q<Q1) or 0 (Q>Q1), low-concentration sewage enters the enhanced sedimentation tank 2 from the energy dissipation and water distribution area 1 for sludge sedimentation, and then enters the low-concentration baffle purification area 43 of the baffle purification area 4 for purification after passing through the last layer of filtration in the fiber filler high-efficiency filtration area 3;

[0075] S06, when h=h0, H 溢流区 , H 高蓄 , H 中蓄 and H 低蓄 When both reach the maximum value, the system water storage capacity reaches the maximum, and the sewage inlet of energy dissipation water distribution area 1 is closed.

[0076] In one of the embodiments, in S01, the sewage is purified in the lower layer of the regulation and storage system, and the sewage flows from the energy dissipation water distribution area 1 into the enhanced sedimentation tank 2 for sludge sedimentation; the first filter layer sewage valve is opened, and the sewage flows from the enhanced sedimentation area 2 through the overflow pipe 21 into the first fiber filler filter layer water distributor connected to it, and enters the first fiber filler filter layer 37 through the water distributor, and enters the water collection tank at the bottom of the fiber filler high-efficiency filter area 3 after three layers of filtration from top to bottom; the high-concentration sewage valve 411 at the entrance of the high-concentration baffle purification area 41 is opened, and the sewage is sent from the water collection tank at the bottom of the fiber filler high-efficiency filter area 3 to the high-concentration baffle purification area 41 through the high-concentration sewage pump 413, and then passes through the medium-concentration 42 and the low-concentration baffle purification area 43 in turn. After purification treatment in the high, medium and low concentration baffle purification areas, it flows to the stable outflow area, and the sewage is discharged through the sewage pump 51 in the stable outflow area 5.

[0077] In one embodiment, in S04, sewage flows from the energy dissipation water distribution area 1 into the enhanced sedimentation tank 2 for mud and dirt sedimentation, the second filter layer sewage valve 35 is opened, and the sewage flows from the enhanced sedimentation area 2 through the overflow pipe 21 into the second fiber filler filter layer water distributor connected thereto, and enters the second fiber filler filter layer 32 through the water distributor, and then enters the water collection tank at the bottom of the fiber filler high-efficiency filter area 3 after two layers of filtration from top to bottom; the medium-concentration sewage valve 421 at the entrance of the medium-concentration baffle purification area 42 is opened, The sewage is sent from the sump at the bottom of the fiber filler high-efficiency filtration area 3 to the medium-concentration baffle purification area 42 through the medium-concentration sewage pump 423. At the same time, when the medium-concentration sewage pump 423 is turned on, the medium-concentration anti-backflow gate 424 located in front of the outlet of the medium-concentration sewage pump 423 is closed to prevent the sewage from flowing back to the previous area, and then passes through the low-concentration baffle purification area 43. After purification treatment in the medium and low-concentration baffle purification areas 42 and 43, it flows to the stable outflow area 5, and the sewage is discharged through the sewage pump 51 in the stable outflow area 5.

[0078] In one of the embodiments, in S05, sewage flows from the energy dissipation water distribution area 1 into the enhanced sedimentation tank 2 for sludge sedimentation, the third filter layer sewage valve 36 is opened, and flows from the enhanced sedimentation area 2 through the overflow pipe 21 into the third fiber filler filter layer water distributor connected thereto, enters the third fiber filler filter layer 33 through the water distributor, and enters the water collection tank at the bottom of the fiber filler high-efficiency filter area 3 after the last layer of filtration; the low-concentration sewage valve 431 at the entrance of the low-concentration baffle purification area 43 is opened, and the sewage is sent from the water collection tank at the bottom of the fiber filler high-efficiency filter area 3 to the low-concentration baffle purification area 43 through the low-concentration sewage pump 433. At the same time, when the low-concentration sewage pump 433 is turned on, the low-concentration backflow prevention gate 434 located in front of the outlet of the low-concentration sewage pump 433 is closed to prevent the sewage from flowing back to the previous area. After purification in the low-concentration baffle purification area 43, it flows to the stable outflow area 5 for outflow, and the sewage is discharged through the sewage pump 51 in the stable outflow area 5.

[0079] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A quality-based and zoned CSO storage and purification system, characterized in that: It is divided into two layers, the lower layer includes energy dissipation and water distribution area, enhanced sedimentation area, fiber filler high-efficiency filtration area, baffle purification area and overflow area; the upper layer includes energy dissipation and water distribution area, water storage area and overflow area, among which: The upper layer and the lower layer share the energy dissipation water distribution area and the overflow area, and an overflow wall and a submersible sewage pump are arranged between the energy dissipation water distribution area and the overflow area; In the lower layer, the energy dissipation and water distribution area is connected to the enhanced sedimentation area, the enhanced sedimentation area is connected to the fiber filler high-efficiency filtration area through an overflow pipe, and the fiber filler high-efficiency filtration area is connected to the baffle purification area through a sewage pump; In the upper layer, the water storage area is connected to the energy dissipation and water distribution area through a drainage ditch; The fiber packing high-efficiency filtration area is a tower-type filtration structure with three layers, and the filtration fineness of each layer increases from top to bottom; a water distributor is arranged on the top of each fiber packing filtration layer, the water distributor is connected to the overflow pipe, and a valve is arranged at the inlet section of the water distributor. A water collection tank is arranged at the bottom of the fiber packing high-efficiency filtration area, and the water collection tank is connected to the baffle purification area through a sewage pump; The baffle purification area is divided into high, medium and low concentration sewage purification areas; In the upper layer, the water storage area is divided into a high-concentration water storage chamber, a medium-concentration water storage chamber and a low-concentration water storage chamber, and is arranged from near to far according to the distance from the energy dissipation water distribution area and the overflow area; The energy dissipation and water distribution area includes a grille front pool, a coarse grille and an energy dissipation sill; the grille front pool has a certain slope in the longitudinal direction, and the plane layout is a trapezoid with a slope of 0.6%~1.0%; the coarse grille gap is set to 20mm~30mm; the energy dissipation sill adopts step energy dissipation with a slope of 30°~35°, and the step width / step height ≥1.5; a uniform water diversion flower wall is arranged at the water outlet of the energy dissipation and water distribution area, and the uniform water diversion flower wall consists of two elliptical hole water distribution flower walls.

2. The quality-based and zoned CSO storage and purification system according to claim 1 is characterized in that: The entrance of the high-concentration sewage purification area includes a high-concentration sewage valve, a high-concentration sewage agent inlet and a high-concentration sewage pump. The high-concentration sewage valve is located in front of the high-concentration sewage agent inlet, and the high-concentration sewage agent inlet is located in the suction pipe section of the high-concentration sewage pump; the medium-concentration sewage purification area includes a medium-concentration sewage valve, a medium-concentration sewage agent inlet, a medium-concentration sewage pump and a medium-concentration backflow prevention gate. The medium-concentration sewage valve is located in front of the medium-concentration sewage agent inlet, and the medium-concentration sewage agent inlet is located in the medium-concentration sewage. The suction pipe section of the water pump, the outlet of the medium-concentration sewage pump is behind the medium-concentration backflow prevention gate; the low-concentration sewage purification area includes a low-concentration sewage valve, a low-concentration sewage agent inlet, a low-concentration sewage pump and a low-concentration backflow prevention gate, the low-concentration sewage valve is located in front of the low-concentration sewage agent inlet, the low-concentration sewage agent inlet is located in the suction pipe section of the low-concentration sewage pump, and the outlet of the low-concentration sewage pump is behind the low-concentration backflow prevention gate; a stable outflow area is set at the end of the baffle purification area, and the sewage is discharged through the stable outflow area.

3. The quality-based and zoned CSO storage and purification system according to claim 1 is characterized in that: The slope of each area of ​​the water storage chamber is 0.8~1.0%, and the elevation close to the drainage ditch is lower than the height of the water storage area. The drainage ditch is set on the lower side of the foot of the water storage chamber with a slope of 0.8~1.0%, and is used as a water transfer channel for the water storage area. Gates are provided at the drainage ditch outlets of the high-concentration water storage chamber, the medium-concentration water storage chamber and the low-concentration water storage chamber.

4. The quality-based and zoned CSO storage and purification system according to claim 1 is characterized in that: The enhanced sedimentation tank adopts horizontal flow type, with a single bucket for mud discharge, a length-to-width ratio of not less than 4, and a water depth of not less than 4m; the bottom slope is 0.9~1.2%, tilting from the outlet to the single bucket, and a gate-type flushing device is adopted at the end, and the gate-type flushing device adopts a hydraulic downward-opening weir gate.

5. The quality-based and zoned CSO storage and purification system according to claim 1 is characterized in that: The fiber filler high-efficiency filtration zone uses fiber filler as the filtration material. The fiber filler is woven into bundles using fiber materials with a porosity of more than 93%. The fiber material is at least one of nylon, vinylon, acrylic fiber, and polyester.

6. The quality-based and zoned CSO storage and purification system according to claim 1 is characterized in that: In the lower layer, there are two enhanced sedimentation areas, two fiber filler high-efficiency filtration areas and two baffle purification areas, which are symmetrically arranged on both sides of the energy dissipation water distribution area and the overflow area; in the upper layer, there are four high-concentration water storage chambers, four medium-concentration water storage chambers and four low-concentration water storage chambers, which are arranged in groups of two on both sides of the energy dissipation water distribution area and the overflow area.

7. A method for purifying rainwater using the quality-divided and zoned CSO storage and purification system according to any one of claims 1 to 6, characterized in that: The specific operations are as follows: S01, when the CSO storage and purification system starts water level h 启动 <The sewage water level in the energy dissipation water distribution pool h≤the top elevation of the overflow wall h0, N=0, when no overflow occurs, the sewage is purified in the lower layer of the regulation and purification system, and the sewage enters the enhanced sedimentation tank from the energy dissipation water distribution area for mud sedimentation, and then passes through the three-layer filtration of the fiber filler high-efficiency filtration area and enters the high, medium and low concentration sewage purification area of ​​the baffle purification area for purification; S02, when h=h0, N=1, the water depth in the overflow area is H 溢流区 > 0, if the external sewage volume Q> system external discharge flow Q1, the submersible sewage pump between the energy dissipation water distribution area and the overflow area will not be started, and the upper layer of the purification system will play a water storage function; if the external sewage volume Q< system external discharge flow Q1, the submersible sewage pump between the energy dissipation water distribution area and the overflow area will be started, and the water in the overflow area will be introduced into the energy dissipation water distribution area and then purified. The flow Q2=Q1-Q, and the sewage is purified according to the steps in S01; S03. When h=h0, N=1, H 溢流区 =0, water depth of high concentration sewage storage chamber h 高蓄 >0, water depth of medium concentration water storage chamber h 中蓄 ≥0, the sewage in the high-concentration sewage storage chamber flows into the energy dissipation water distribution area through the drainage ditch. When Q<Q1, the flow rate q 高 = Q1-Q, when Q>Q1, the flow rate q 高 =0, the sewage is purified according to the steps in S01; S04, when h=h0, N=1, H 溢流区 =0,H 高蓄 =0,H 中蓄 >0,H 低蓄 ≥0, the sewage in the medium concentration water storage chamber flows into the energy dissipation water distribution area through the drainage ditch. When Q<Q1, the flow rate q 中 = Q1-Q, when Q>Q1, the flow rate q 中 =0, the sewage enters the enhanced sedimentation tank from the energy dissipation and water distribution area for sludge sedimentation, and then passes through the two layers below the fiber filler high-efficiency filtration area and enters the medium and low concentration sewage purification area of ​​the baffle purification area for purification; S05, when h=h0, N=1, H 溢流区 =0, H 高蓄 =0,H 中蓄 =0,H 低蓄 ≥0, the sewage in the low-concentration water storage chamber flows into the energy dissipation water distribution area through the drainage ditch. When Q<Q1, the flow rate q 低 = Q1-Q, when Q>Q1, the flow rate q 低 = 0, the sewage enters the enhanced sedimentation tank from the energy dissipation and water distribution area for sludge sedimentation, and then passes through the last layer of filtration in the fiber filler high-efficiency filtration area and enters the low-concentration sewage purification area in the baffle purification area for purification; S06, when h=h0, H 溢流区 , H 高蓄 , H 中蓄 and H 低蓄 When both reach the maximum value, the system water storage capacity reaches the maximum, and the sewage inlet of the energy dissipation and water distribution area is closed.

8. The method for purifying rainwater according to claim 7, characterized in that: In S01, the sewage is purified in the lower layer of the regulation and storage system, and the sewage flows from the energy dissipation water distribution area into the enhanced sedimentation tank for mud and dirt sedimentation; the sewage valve of the first filter layer is opened, and the sewage flows from the enhanced sedimentation area through the overflow pipe into the first fiber filler filter layer water distributor connected to it, and enters the first fiber filler filter layer through the water distributor, and then enters the water collection tank at the bottom of the fiber filler high-efficiency filter area after three layers of filtration from top to bottom; The high-concentration sewage valve at the entrance of the high-concentration sewage purification area is opened, and the sewage is pumped from the sump at the bottom of the fiber filler high-efficiency filtration area to the high-concentration baffle purification area through the high-concentration sewage pump, and then passes through the medium-concentration and low-concentration baffle purification areas in sequence. After being purified in the high, medium and low-concentration baffle purification areas, it flows to the stable outflow area outflow; In the S04, the sewage flows from the energy dissipation water distribution area into the enhanced sedimentation tank by gravity for mud and dirt sedimentation, the sewage valve of the second filter layer is opened, and the sewage flows from the enhanced sedimentation area through the overflow pipe into the second fiber filler filter layer water distributor connected thereto, and enters the second fiber filler filter layer through the water distributor, and then enters the water collection tank at the bottom of the fiber filler high-efficiency filtration area after two layers of filtration from top to bottom; the medium-concentration sewage valve at the entrance of the medium-concentration sewage purification area is opened, and the sewage is pumped from the water collection tank at the bottom of the fiber filler high-efficiency filtration area to the medium-concentration baffle purification area through the medium-concentration sewage pump. At the same time, when the medium-concentration sewage pump is turned on, the medium-concentration anti-backflow gate located in front of the medium-concentration sewage pump outlet is closed to prevent the sewage from flowing back to the previous area, and then passes through the low-concentration baffle purification area, and after purification treatment in the medium and low-concentration baffle purification areas, it flows to the stable outflow area outflow; In the S05, the sewage flows from the energy dissipation water distribution area into the enhanced sedimentation tank for mud sedimentation, the valve of the third fiber packing filter layer water distributor is opened, and the sewage flows from the enhanced sedimentation area through the overflow pipe into the third fiber packing filter layer water distributor connected to it, enters the third fiber packing filter layer through the water distributor, passes through the last layer of filtration, and then enters the water collection tank at the bottom of the fiber packing high-efficiency filtration area; Open the low-concentration sewage valve at the entrance of the low-concentration sewage purification area, and the sewage will be pumped from the sump at the bottom of the fiber filler high-efficiency filtration area to the low-concentration baffle purification area through the low-concentration sewage pump. At the same time, when the low-concentration sewage pump is turned on, the low-concentration anti-backflow gate located in front of the low-concentration sewage pump outlet will be closed to prevent the sewage from flowing back to the previous area. After purification in the low-concentration baffle purification area, it will flow to the stable outflow area.

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