A deep and rapid two-stage rain and sewage combined water quality treatment device and method

Abstract

The present application relates to the technical field of urban combined sewer district wastewater treatment, and particularly relates to a deep and rapid two-stage combined rainwater and sewage water quality treatment device and method, which comprises a liquid-driven flow regulating device and a wastewater treatment unit arranged in sequence along the water flow direction, and the wastewater treatment unit comprises a rapid treatment unit and a deep treatment unit arranged in parallel. The present application divides the unstable inflow of the combined sewer district into two working conditions of sunny day and rainy day, and transfers them to the deep treatment unit and the rapid treatment unit for treatment through the liquid-driven flow regulating device. The water quality concentration of the inflow treated by the deep treatment unit is higher, and the water quality standard after treatment is also higher, which can be used for ecological water supplement or other resource utilization. The water quality concentration of the inflow treated by the rapid treatment unit is lower, and the water quality standard after treatment is also lower, which can realize rapid treatment of a large amount of combined rainwater and sewage to reduce overflow pollution into the river. Therefore, the present application can solve the water quality treatment technical problem of wastewater filtration and separation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of urban combined sewage treatment, and particularly relates to a deep and rapid two-stage rainwater and sewage combined water quality treatment device and method. BACKGROUND

[0002] Urban drainage systems are generally divided into combined systems and separate systems. In the early stages of urban construction, the combined system was mostly used. However, in recent years, the urban population has been growing, and the non-porous area of the ground surface has increased, which has changed the urban hydrological cycle process, increased the water volume entering the combined drainage system, and caused overflow pollution events to occur frequently, resulting in continuous deterioration of the urban water environment quality and problems such as black and odorous water bodies. Although rainwater and sewage separation reconstruction work is being carried out in various places, the reconstruction of the combined system involves a large amount of urban renewal construction, and the combined system itself is also reasonable in some areas, so the combined drainage system will continue to exist in a large number of urban construction for a period of time in the future. Under such circumstances, how to choose a reasonable sewage treatment technology to effectively deal with the negative problems caused by the large changes in the flow and concentration of the combined system in the rainy season has become the focus of research in the relevant field.

[0003] In the dry season, the main transmission in the combined system pipe network is domestic sewage, which has a high pollutant concentration and relatively stable water volume. However, in the rainy season, a large amount of rainwater and sewage combined water is included in the combined system pipe network. Due to the different characteristics of rainfall, the combined sewage also presents different characteristics of the scene, mainly manifested in the instability of the water volume of the combined sewage and the significant reduction of the sewage concentration compared with the sewage in the dry season. On the one hand, this will cause a large water volume impact on the sewage treatment plant, and on the other hand, the change in water quality will also have a great impact on the treatment effect of the biochemical section of the sewage treatment unit.

[0004] The rainwater and sewage combined water treatment device and method in the prior art usually use intercepting wells, inspection wells and sewage treatment units to treat sewage according to the different water quality and water volume. However, the structure design of the intercepting well and the inspection well is relatively simple, and in addition, the sewage treatment unit is in a series mode and can only treat the sewage at one time. If the sewage volume is large, the problem of quality treatment of sewage filtration and separation cannot be effectively solved. SUMMARY

[0005] The purpose of the present application is to provide a deep and rapid two-stage rainwater and sewage combined water quality treatment device and method, which can solve the quality treatment technical problem of sewage filtration and separation by setting a liquid-driven flow regulating device and treating the sewage in sunny weather and rainy weather respectively.

[0006] In order to achieve the above-mentioned purpose, the application designs a depth and rapid two-stage rain and sewage combined water quality treatment device, which comprises a liquid-driven flow regulating device and a sewage treatment unit arranged in sequence along the water flow direction, the sewage treatment unit comprises a rapid treatment unit and a depth treatment unit arranged in parallel, and the water inlets of the rapid treatment unit and the depth treatment unit are communicated with the water outlet of the liquid-driven flow regulating device; the liquid-driven flow regulating device is internally provided with a liquid-driven flow regulating structure, and the liquid-driven flow regulating structure is used for adjusting the sewage quantity and sewage concentration entering the rapid treatment unit.

[0007] As a preferred scheme, the liquid-driven flow regulating device is further provided with a water inlet tank, a water inlet gate well and a water inlet channel in sequence along the water flow direction, the water inlet gate well is internally provided with a cavity structure, and the liquid-driven flow regulating structure is arranged in the cavity of the water inlet gate well; one side of the water inlet tank is communicated with the depth treatment unit; and the end of the water inlet channel is communicated with the rapid treatment unit.

[0008] As a preferred scheme, the liquid-driven flow regulating structure comprises a self-cleaning grid, a liquid-driven flow regulating gate and a liquid-driven rapid opening gate, the self-cleaning grid is arranged on the side close to the water inlet tank, the liquid-driven flow regulating gate is arranged on the side of the self-cleaning grid, and the liquid-driven rapid opening gate is arranged on the side close to the water inlet channel.

[0009] As a preferred scheme, the water inlet gate well is connected with a cleaning pipe at the top, which is used for injecting water into the water inlet channel so as to flush the sludge in the water inlet channel.

[0010] As a preferred scheme, the middle part of the water inlet tank is provided with an overflow weir, so as to divide the water inlet tank into a water inlet chamber and a distribution chamber, one side of the water inlet chamber is communicated with a water inlet combined tank culvert, the other side of the water inlet chamber is communicated with a receiving water body, one side of the distribution chamber is communicated with the water inlet gate well, and the other side of the distribution chamber is communicated with the depth treatment unit.

[0011] As a preferred scheme, the rapid treatment unit comprises a combined flow regulating and storage tank, a sedimentation system and a rotary disc filter arranged in sequence along the water flow direction, the water inlet of the combined flow regulating and storage tank is communicated with the end of the water inlet channel, the combined flow regulating and storage tank is internally provided with a distribution well for distributing sewage, the sedimentation system is used for depositing the sewage flowing from the combined flow regulating and storage tank, and the rotary disc filter is used for filtering the sewage flowing from the sedimentation system.

[0012] As a preferred scheme, the depth treatment unit comprises an aeration grit chamber, a biochemical reaction tank and a biological membrane reaction tank, the water inlet of the aeration grit chamber is communicated with the end of the water inlet channel, the aeration grit chamber is internally provided with a coarse grid and a fine grid for intercepting floating matters in the sewage, the biochemical reaction tank is internally provided with a membrane grid, and the biological membrane reaction tank utilizes a membrane system to filter and separate the sewage containing sludge in the reaction tank.

[0013] The application also designs a deep and rapid two-stage rain and sewage combined water quality treatment method, the two stages refer to sunny day working condition and rainy day working condition respectively, and specifically include the following steps,

[0014] In the sunny day working condition, the liquid dynamic flow adjusting structure is closed, sewage directly enters the deep treatment unit from the water inlet tank, and after the aeration, biochemical reaction and membrane system reaction of the deep treatment unit, the filtration and separation of the sewage are realized.

[0015] In the rainy day working condition, the liquid dynamic flow adjusting structure is opened, one part of sewage enters the deep treatment unit from the water inlet tank for filtration and separation; the other part of sewage is filtered and flow adjusted by the liquid dynamic flow adjusting structure and then enters the rapid treatment unit for further sedimentation and filtration, so that the double filtration, separation and purification of the sewage are realized.

[0016] As a preferred scheme, the rainy day working condition specifically includes the following steps:

[0017] In the early stage of rainfall, when the water inflow exceeds the design flow, the self-cleaning grid, the liquid dynamic flow adjusting gate and the liquid dynamic quick opening gate are opened, the sewage is first intercepted by the self-cleaning grid to remove large floating objects in the water, and then flows into the water inlet channel through the liquid dynamic flow adjusting gate and the liquid dynamic quick opening gate to avoid blocking the subsequent facilities; then the sewage flows into the combined storage tank from the water inlet channel, and as the rainfall continues, the water level of the combined storage tank gradually rises, when the water level in the combined storage tank reaches the design water level, the self-cleaning grid and the liquid dynamic flow adjusting gate are closed, and the sewage continues to be sedimented and filtered in the rapid treatment unit.

[0018] In the late stage of rainfall, when the water storage level of the combined storage tank exceeds its storage capacity, part of the sewage is directly discharged into the receiving water body from the water inlet tank.

[0019] After the rain stops, according to the siltation condition of the water inlet channel, the liquid dynamic flow adjusting gate and the liquid dynamic quick opening gate are closed, water is injected into the water inlet channel through the cleaning pipe, and when the liquid level in the water inlet gate well reaches the design liquid level, the liquid dynamic quick opening gate is quickly opened to flush the silt in the water inlet channel.

[0020] The application has the following beneficial effects:

[0021] The unstable inflow area of the confluence section area is divided into two working conditions of sunny day and rainy day, and the liquid dynamic flow adjusting device is used to transfer the inflow to the deep treatment unit and the rapid treatment unit respectively. The water quality concentration of the inflow treated by the deep treatment unit is higher, and the water quality standard after treatment is also higher, and can be used for ecological water supplement or other resource utilization. The water quality concentration of the inflow treated by the rapid treatment unit is lower, and the water quality standard after treatment is also lower, and can realize rapid treatment of a large amount of rainwater and sewage combined flow to reduce overflow pollution into the river. Through the method provided by the present application, the problem of the impact of the municipal sewage treatment system caused by the unstable water quantity and water quality of the inflow of the urban combined section area can be effectively solved. Therefore, the present application can effectively solve the negative problems of the combined system in the rain season, and solve the quality treatment technology problem of sewage filtration and separation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the plane structure of the present application.

[0023] Figure 2 It is a schematic diagram of the plane structure of the liquid dynamic flow adjusting device of the present application.

[0024] Figure 3 It is Figure 2 It is a sectional view at A-A.

[0025] Figure 4 It is a schematic diagram of the plane structure of the rapid treatment unit of the present application.

[0026] Figure 5 It is a schematic diagram of the plane structure of the deep treatment unit of the present application.

[0027] BRIEF DESCRIPTION OF DRAWINGS:

[0028] 1-influent combined box culvert; 15-ultraviolet disinfection tank; 16-metering channel; 101-liquid dynamic flow adjusting device; 102-rapid treatment unit; 103-deep treatment unit; 104-receiving water body;

[0029] 101-liquid dynamic flow adjusting device: 17-fast closing gate; 18-self-cleaning grid; 19-liquid dynamic flow adjusting gate; 20-liquid dynamic fast opening gate; 21-ultrasonic level meter; 22-influent tank; 23-overflow weir; 24-influent gate well; 25-influent channel; 26-cleaning pipe; 27-flow hole; 28-cage ladder; 111-liquid dynamic flow adjusting structure; 221-influent chamber; 222-shunt chamber;

[0030] 102-rapid treatment unit: 3-combined storage tank; 4-sedimentation system; 5-rotary drum filter tank;

[0031] 103 - advanced treatment unit: 6 - coarse screen; 7 - fine screen; 8 - aerated grit chamber; 15 - biochemical reaction tank (9 - membrane screen; 10 - selection tank; 11 - anaerobic tank; 12 - anoxic tank; 13 - aerobic tank); 14 - bio-membrane reaction tank. DETAILED DESCRIPTION

[0032] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present application will be further described below in conjunction with the accompanying drawings and specific embodiments. It can be understood that the specific embodiments described here are only used to explain the present application, but not limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, not all.

[0033] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0034] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or it can be detachable connection; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In view of the problems of large water quantity variation, low concentration in rain season and the like in the present urban combined sewer district sewage treatment, the application provides a deep and rapid two-stage rainwater and sewage combined flow water quality treatment device and method for coping with the urban combined sewer district, a liquid flow regulating device is arranged at the end of a combined sewer box, and a combined flow regulating and storage tank, magnetic coagulation sedimentation, a fiber rotating disc filter and the like are arranged at the rear end of the liquid flow regulating device, according to the water quantity and water level variation of the source sewage, the opening and closing state of the liquid flow regulating device is adjusted, and according to the reaction conditions of the rear end sewage treatment corresponding to different inflow, the quality treatment of the rainwater and sewage mixed inflow is realized. The application can cope with the characteristics of unstable inflow in the urban combined sewer district and low concentration of sewage in the rain season, effectively resist the storm impact load, reduce the overflow pollution of the combined system, has the characteristics of reliability, environmental protection and high efficiency, and is suitable for application in the urban combined sewer treatment project.

[0036] The application constructs a quality treatment system composed of a deep treatment unit and a rapid treatment unit, and adopts a two-stage quality treatment process. The deep treatment unit is composed of a grid pool, a sand settling pool, a membrane grid, an anoxic pool, an anaerobic pool, an aerobic pool and a biological reaction membrane pool which are sequentially connected through pipelines, the rapid treatment unit is composed of a combined flow regulating and storage tank, magnetic coagulation sedimentation and a fiber rotating disc filter which are sequentially connected through pipelines, and the deep treatment unit and the rapid treatment unit are connected through a liquid flow regulating device at the end of the inflow combined box, according to the variation process of the inflow water level, the deep treatment unit and the rapid treatment unit are selected to treat the inflow, and the tail water after treatment is discharged after disinfection.

[0037] As shown in Figure 1 , the application provides a deep and rapid two-stage rainwater and sewage combined flow water quality treatment device, which comprises a liquid flow regulating device 101 and a sewage treatment unit arranged in sequence along the water flow direction, the sewage treatment unit comprises a rapid treatment unit 102 and a deep treatment unit 103 arranged in parallel, the inflow of the rapid treatment unit 102 and the deep treatment unit 103 is communicated with the outflow of the liquid flow regulating device 101, the liquid flow regulating device 101 is provided with a liquid flow regulating structure 111, and the liquid flow regulating structure 111 is used for adjusting the sewage quantity and the sewage concentration entering the rapid treatment unit 102.

[0038] As shown in Figure 2 , Figure 3As shown, an opening is made inside the inlet confluence box culvert 1, and a hydraulic flow regulating device 101 is installed. The hydraulic flow regulating device 101 is integrated into the end of the inlet confluence box culvert. Inside the hydraulic flow regulating device 101, along the water flow direction, there are sequentially arranged an inlet tank 22, an inlet gate well 24, a hydraulic flow regulating structure 111, and an inlet channel 25. The inlet gate well 24 has a hollow structure inside, and the hydraulic flow regulating structure 111 is installed inside the cavity of the inlet gate well 24. One side of the inlet tank 22 is connected to the deep treatment unit 103; the end of the inlet channel 25 is connected to the rapid treatment unit 102. The water flow direction is shown by the arrow in the figure.

[0039] The hydraulic flow regulation structure 111 includes a self-cleaning screen 18, a hydraulic flow regulation gate 19, and a hydraulic quick-opening gate 20. The self-cleaning screen 18 is located near the inlet tank 22, the hydraulic flow regulation gate 19 is located on the side of the self-cleaning screen 18, and the hydraulic quick-opening gate 20 is located near the inlet channel 25. An overflow hole 27 is provided on the side wall of the inlet tank 22, which is connected to the inlet gate well 24, to facilitate water flow from the diversion chamber 222 into the inlet gate well 24. The hydraulic flow regulation structure 111 regulates the amount and concentration of sewage entering the combined sewer storage tank 3 by adjusting the opening and closing of the self-cleaning screen 18, the hydraulic flow regulation gate 19, and the hydraulic quick-opening gate 20. A cleaning pipe 26 is connected to the top of the inlet gate well 24 for injecting water into the inlet channel 25 to flush away the sludge. The bottom of the water intake gate well 24 is equipped with a protective cage ladder 28 for the maintenance hydraulic flow regulating structure 111.

[0040] An overflow weir 23 is provided in the middle of the inlet tank 22. The overflow weir 23 is used to concentrate the water from the inlet confluence culvert 1 out through a single outlet, preventing a large amount of boiling water from directly washing the self-cleaning grille 18 and the hydraulically operated flow regulating gate 19. The overflow weir 23 divides the inlet tank 22 into an inlet chamber 221 and a diversion chamber 222. One side of the inlet chamber 221 is connected to the inlet confluence culvert, and the other side is connected to the receiving water body 104. One side of the diversion chamber 222 is connected to the inlet gate well 24, and the other side is connected to the deep treatment unit 103. Ultrasonic level gauges 21 are provided at the bottom of both the diversion chamber 222 and the inlet gate well 24 for monitoring the liquid level.

[0041] like Figure 4 As shown, the rapid treatment unit 102 includes a combined flow storage tank 3, a sedimentation system 4, and a rotary filter 5 arranged sequentially along the water flow direction. Each reaction tank is connected by a pipe. The inlet of the combined flow storage tank 3 is connected to the end of the inlet channel 25. The combined flow storage tank 3 is equipped with a diversion well for sewage diversion. The sedimentation system 4 uses magnetic force to settle the sewage flowing into the combined flow storage tank 3. The rotary filter 5 is made of fiber and is used to filter the sewage flowing into the sedimentation system 4.

[0042] like Figure 5 As shown, the deep treatment unit 103 includes an aerated grit chamber 8, a biochemical reaction tank 15, and a biofilm reaction tank 14. The reaction tanks are connected by pipes. The inlet of the aerated grit chamber 8 is connected to the end of the inlet channel 25. The aerated grit chamber 8 is equipped with coarse and fine screens to intercept floating objects in the sewage. The biochemical reaction tank 15 is equipped with a membrane screen. The biofilm reaction tank 14 uses a membrane system to filter and separate the sludge-containing sewage in the reaction tank.

[0043] The two streams of water treated by the advanced treatment unit and the rapid treatment unit of this invention are mixed and then enter a disinfection tank for disinfection. After disinfection, the water enters the receiving water body through the discharge outlet. The disinfection process is ultraviolet light disinfection. The effluent from the biofilm reactor 14 of the advanced treatment unit and the fiber disc filter 5 of the rapid treatment unit enters the ultraviolet disinfection tank 15. After removing bacteria, pathogens, and other harmful substances from the wastewater in the ultraviolet disinfection system, it is metered through the metering channel 16 and discharged after meeting the standards.

[0044] This invention also provides a deep, rapid, two-stage method for the separation of combined sewer and stormwater runoff, wherein the two stages refer to sunny day conditions and rainy day conditions, and specifically include the following steps:

[0045] Under sunny conditions, the hydraulic flow regulation structure 111 is closed, and the sewage directly enters the deep treatment unit 103 from the inlet tank 22. After the aeration, biochemical and membrane system reaction in the deep treatment unit 103, the sewage is filtered and separated.

[0046] Under sunny conditions, when the influent flow rate is lower than the design flow rate, the hydraulically operated flow regulating gate 19, the self-cleaning screen 18 are closed, the quick-closing gate 17 and the hydraulically operated quick-opening gate 20 are normally open, and the sewage directly enters the deep treatment unit 103 through the quick-closing gate 17. At this time, the influent water quality standards are: COD≤330, BOD5≤160, ammonia nitrogen≤35, total nitrogen≤45, total phosphorus≤6, suspended solids≤200, and pH range is 6~9. Wastewater is intercepted through the inlet culvert 1 and enters the coarse screen 6 to remove large pieces of garbage and scum. After that, it enters the fine screen 7 to further remove fine suspended solids. Then, it flows by gravity into the aerated grit chamber 8 to remove solid particles. After that, the wastewater enters the biological reaction tank consisting of the membrane screen 9, the selector tank 10, the anaerobic tank 11, the anoxic tank 12, and the aerobic tank 13 for treatment. The retention time in the anaerobic tank 11 is 1.89 hours, the retention time in the anoxic tank 12 is 5.40 hours, and the retention time in the aerobic tank 13 is 8.76 hours. After passing through the biological reaction section, the wastewater enters the biofilm reaction tank 14. The membrane system filters the muddy wastewater in the reaction tank to achieve mud-water separation, while enhancing the system's biological function to ensure that the effluent is clear and transparent.

[0047] In the rain condition, the liquid flow adjusting structure 111 is opened, and one part of the sewage is filtered and separated in the advanced treatment unit 103 from the water inlet tank 22; the other part of the sewage is filtered and adjusted by the liquid flow adjusting structure 111 and then enters the rapid treatment unit 102 to continue to be precipitated and filtered, so as to realize the double filtration, separation and purification of the sewage.

[0048] The rain condition specifically includes the following steps:

[0049] In the early stage of the rain, when the water quantity exceeds the design flow, i.e. when the source sewage is 1-3 times of the design flow, the self-cleaning grid 18, the liquid flow adjusting gate 19 and the liquid quick opening gate 20 are opened, the sewage is first intercepted by the self-cleaning grid 18 to remove the large floating matters, and then flows into the water inlet channel from the liquid flow adjusting gate 19 and the liquid quick opening gate 20 to avoid the blockage of the subsequent facilities; then the sewage flows into the combined flow regulating tank 3 from the water inlet channel, and with the rain, the water level of the combined flow regulating tank 3 gradually rises, when the ultrasonic liquid level meter 21 in the combined flow regulating tank 3 detects that the water level reaches the design water level, the self-cleaning grid 18 and the liquid flow adjusting gate 19 are closed, the sewage enters the magnetic coagulation and precipitation system from the combined flow regulating tank and starts to run, and the sewage continues to be precipitated and filtered in the rapid treatment unit, and the magnetic precipitation system 4 and the fiber rotating disc filter 5 start to run. At this time, the water quality standard is: COD≤65, BOD5≤30, total phosphorus≤3, suspended solids≤200, and the PH range is 6-9.

[0050] In the late stage of the rain, when the ultrasonic liquid level meter 21 in the combined flow regulating tank detects that the liquid level exceeds the storage water level of the combined flow regulating tank 3, i.e. when the source sewage exceeds 3 times of the design flow, the liquid flow adjusting gate 19 is closed by the water level control, and the sewage exceeding the regulating capacity of the combined flow regulating tank 3 overflows at the front end of the combined flow regulating tank to enter the receiving water body 104, and the receiving water body 104 is the water exceeding the treatment capacity directly overflowing into the natural water body.

[0051] After the rain stops, according to the siltation condition of the water inlet channel 25, the liquid flow adjusting gate 19 and the liquid quick opening gate 20 are closed, and water is injected into the water inlet channel 25 through the cleaning pipe 26, when the liquid level in the water inlet gate well 24 reaches the design liquid level, the liquid quick opening gate 20 is quickly opened to flush the silt in the water inlet channel 25.

[0052] In the embodiment, the design treatment scale is 20000m 3 / d, the advanced treatment unit operates according to the design scale, and the maximum treatment scale of the rapid treatment unit is 40000m 3The rain and sewage are combined, and the sewage is treated by the method. The effluent of the deep treatment unit can reach COD≤30, BOD5≤6, ammonia nitrogen≤1.5, total nitrogen≤15, total phosphorus≤0.3, suspended solids≤10, and the PH range is 6-9; the effluent of the rapid treatment unit can reach suspended solids≤10, total phosphorus≤1.0, and fecal coliform bacteria≤10 4 The magnetic precipitation system improves the flocculation settling speed by adding high-efficiency recyclable magnetic powder in the coagulation stage, and improves the coagulation reaction effect by using a sludge backflow device, and further removes the suspended solids in the sewage by using a filter cloth filter tank. Since the rapid treatment system does not need to use a biochemical treatment process, the sewage treatment time is far less than the hydraulic retention time of the conventional domestic sewage treatment process.

[0053] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A deep, rapid, two-stage combined sewer system for water separation treatment, characterized in that: The system includes a hydraulic flow regulating device (101) and a sewage treatment unit arranged sequentially along the water flow direction. The sewage treatment unit includes a rapid treatment unit (102) and a deep treatment unit (103) arranged in parallel. The inlets of the rapid treatment unit (102) and the deep treatment unit (103) are connected to the outlet of the hydraulic flow regulating device (101). The hydraulic flow regulating device (101) is provided with a hydraulic flow regulating structure (111), which is used to regulate the amount and concentration of sewage entering the rapid treatment unit (102). The hydraulic flow regulating device (101) is also provided with an inlet tank (22), an inlet gate well (24), and an inlet channel (25) in sequence along the water flow direction. The inlet gate well (24) has a hollow structure inside, and the hydraulic flow regulating structure (111) is set in the hollow cavity of the inlet gate well (24). One side of the inlet tank (22) is connected to the deep treatment unit (103); the end of the inlet channel (25) is connected to the rapid treatment unit (102). The hydraulic flow control structure (111) includes a self-cleaning grille (18), a hydraulic flow control gate (19), and a hydraulic quick-opening gate (20). The self-cleaning grille (18) is located on the side near the inlet tank (22), the hydraulic flow control gate (19) is located on the side of the self-cleaning grille (18), and the hydraulic quick-opening gate (20) is located on the side near the inlet channel (25). The water inlet tank (22) is provided with an overflow weir in the middle, which divides the water inlet tank (22) into an inlet chamber (221) and a diversion chamber (222). One side of the inlet chamber (221) is connected to the water inlet culvert, and the other side of the inlet chamber (221) is connected to the receiving water body (104). One side of the diversion chamber (222) is connected to the water inlet gate well (24), and the other side of the diversion chamber (222) is connected to the deep treatment unit (103).

2. The deep, rapid, two-stage combined sewer system for water separation treatment according to claim 1, characterized in that: The top of the inlet gate well (24) is connected to a cleaning pipe (26) for injecting water into the inlet channel (25) to flush the silt in the inlet channel (25).

3. The deep, rapid, two-stage combined sewer system for water separation treatment according to claim 2, characterized in that: The rapid treatment unit (102) includes a combined storage tank (3), a sedimentation system (4), and a rotary filter (5) arranged sequentially along the water flow direction. The inlet of the combined storage tank (3) is connected to the end of the inlet channel (25). The combined storage tank (3) is equipped with a diversion well for sewage diversion. The sedimentation system (4) is used to settle the sewage flowing into the combined storage tank (3). The rotary filter (5) is used to filter the sewage flowing into the sedimentation system (4).

4. The deep, rapid, two-stage combined sewer system for water separation treatment according to claim 3, characterized in that: The deep treatment unit (103) includes an aerated grit chamber (8), a biochemical reaction tank (15), and a biofilm reaction tank (14). The inlet of the aerated grit chamber (8) is connected to the end of the inlet channel (25). The aerated grit chamber (8) is equipped with coarse and fine screens to intercept floating objects in the sewage. The biochemical reaction tank (15) is equipped with a membrane screen. The biofilm reaction tank (14) uses a membrane system to filter and separate the muddy sewage in the reaction tank.

5. A deep, rapid, two-stage combined sewer system for water separation treatment, using the deep, rapid, two-stage combined sewer system for water separation treatment according to any one of claims 1-4, characterized in that: The two phases refer to sunny weather conditions and rainy weather conditions, respectively, and specifically include the following steps. Under sunny conditions, the hydraulic flow control structure (111) is closed, and the sewage directly enters the deep treatment unit (103) from the inlet tank (22). After the aeration, biochemical and membrane system reaction of the deep treatment unit (103), the sewage is filtered and separated. In rainy weather, the hydraulic flow regulation structure (111) is activated, and one part of the sewage enters the deep treatment unit (103) from the inlet tank (22) for filtration and separation; the other part of the sewage enters the rapid treatment unit (102) after being filtered and regulated by the hydraulic flow regulation structure (111), where it continues to settle and filter, thus achieving dual filtration, separation and purification of sewage.

6. The deep, rapid, two-stage combined sewer system treatment method according to claim 5, characterized in that: The specific steps for working in rainy conditions are as follows: In the early stages of rainfall, when the inflow exceeds the design flow rate, the self-cleaning screen (18), hydraulic flow regulating gate (19), and hydraulic quick-opening gate (20) are opened. The sewage first passes through the self-cleaning screen (18) to intercept large floating objects in the water, and then flows into the inlet channel (25) through the hydraulic flow regulating gate (19) and hydraulic quick-opening gate (20) to avoid clogging subsequent facilities. Then the sewage flows into the combined storage tank (3) from the inlet channel (25). As the rainfall continues, the water level in the combined storage tank (3) gradually rises. When the water level in the combined storage tank (3) reaches the design water level, the self-cleaning screen (18) and hydraulic flow regulating gate (19) are closed, and the sewage continues to undergo sedimentation and filtration in the rapid treatment unit (102). During the later stages of rainfall, when the water level of the combined sewer storage tank (3) exceeds its storage capacity, some sewage is directly discharged from the inlet tank (22) into the receiving water body (104). After the rain stops, depending on the siltation in the inlet channel (25), close the hydraulic flow regulating gate (19) and the hydraulic quick-opening gate (20), and inject water into the inlet channel (25) through the cleaning pipe (26). When the liquid level in the inlet gate well (24) reaches the design level, quickly open the hydraulic quick-opening gate (20) to flush the silt in the inlet channel (25).

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