A preliminary rain sewage interception system for river basin management and a regulation and storage and reuse method

Abstract

The application discloses a system for intercepting sewage in initial rainwater and a method for adjusting, storing and recycling, which comprises a flow guide channel, a storage tank and a sewage interception system. The storage tank is built on the bank of a river basin and arranged at the terminal of the flow guide channel. An adjusting and storing well is arranged between the flow guide channel and the storage tank. A flow guide channel is arranged between the flow guide channel and the adjusting and storing well. A lifting pump and a recycling pump are installed on the adjusting and storing well. The lifting pump pumps out water in the adjusting and storing well. The recycling pump pumps out water in the storage tank. A flood discharge gate is arranged on the side of the storage tank facing the river basin. The flow guide channel comprises a front flow guide section and a rear flow guide section. A flow guide opening is arranged on one side of the joint of the front flow guide section and the rear flow guide section. The system realizes diversion treatment of initial rainwater and later rainwater, intercepts and treats initial rainwater with high pollution load concentration, effectively reduces the pollution of initial rainwater to the river channel, recycles rainwater and stores and adjusts rainwater runoff.

Description

Technical Field

[0001] This invention relates to the field of watershed system management technology, and in particular to a first-rainwater interception system and a method for regulating and reusing watershed water. Background Technology

[0002] Rainfall runoff pollution is the most serious type of non-point source pollution. Its occurrence is random and the total amount of pollutants discharged fluctuates greatly. With the public's increasing demands for environmental protection, countries around the world are paying more and more attention to the control of its pollution. Environmentalists have invested a lot of human and material resources in this field to conduct a great deal of research.

[0003] In the early stages of rainfall, road dust, mud, oil, and even garbage quickly flow into drainage ditches along with the initial rainwater. In addition, the mixed rainwater and sewage often overflow due to the limited interception capacity of sewage pipes. The mixed water in the early stages of the overflow has not been sufficiently diluted, and its pollutant concentration is also high. If the aforementioned polluted initial rainwater and overflowing mixed rainwater and sewage are directly discharged into downstream water bodies, they often cause serious pollution impacts, and the pollution is dispersed throughout the water body, making cleanup difficult.

[0004] Regarding the interception of rainfall events, traditional methods involve laying interceptor sewer pipes to discharge wastewater into downstream water treatment plants. However, due to the significant difference in pollutant concentrations between the early and later stages of the rainy season, the treatment efficiency is often low. Therefore, initial rainwater runoff pollution storage and regulation ponds are a crucial technology for controlling rainwater runoff pollution and reducing pollution loads, playing a vital role in protecting water quality. To this end, we propose an initial rainwater interception system and a storage and reuse method for watershed management, aiming to reduce the pollution of urban rivers caused by heavily polluted initial rainwater. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a rainwater interception system and a method for regulating and reusing rainwater for watershed management. This system enables the separation and treatment of initial and subsequent rainwater, intercepts and treats initial rainwater with high pollution load concentration, effectively reduces the pollution of rivers by initial rainwater, recycles and reuses rainwater, and regulates and stores rainwater runoff.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a first-rain interception system for watershed management, comprising a diversion channel, a storage tank, and a sewage interception system. The storage tank is constructed on the bank of the watershed and located at the end of the diversion channel. A storage well is provided between the diversion channel and the storage tank. A guide channel is provided between the diversion channel and the storage well. A lift pump and a reuse pump are installed on the storage well. The lift pump pumps water out of the storage well, and the reuse pump pumps water out of the storage tank. A floodgate is provided on the side of the storage tank facing the watershed.

[0007] The diversion channel includes a front diversion section and a rear diversion section. A diversion port is provided on one side of the connection between the front diversion section and the rear diversion section. The two ends of the diversion channel correspond to the diversion port and the storage well, respectively. The front diversion section has a interception zone, in which coarse and fine screens are installed.

[0008] The sewage interception system includes an intelligent control cabinet, gate A, gate B, and a water quality monitoring instrument. Gate A is located in the upstream section of the diversion and is used to open and close the diversion outlet. Gate B is located between the upstream and downstream sections of the diversion and is used to connect and disconnect the upstream and downstream sections. The water quality monitoring instrument is installed at the position corresponding to the diversion outlet in the upstream section of the diversion and is used to detect mixed rainwater. The intelligent control cabinet receives the detection results from the water quality monitoring instrument and controls gate A and gate B in real time.

[0009] As a preferred embodiment of the present invention, the interception zone is disposed on the front section of the diversion, the diversion port is located between the interception zone and the rear section of the diversion, the coarse grid is disposed on the front side of the fine grid, and the fine grid has multiple bends.

[0010] As a preferred embodiment of the present invention, a water-blocking filter wall is installed inside the regulating well. The surface of the water-blocking filter wall is provided with a plurality of evenly distributed seepage holes. The water-blocking filter wall has a frustum-shaped structure, and a water-filtering component is provided on the outer wall of the water-blocking filter wall.

[0011] As a preferred embodiment of the present invention, the water filtration assembly includes four sets of fixed nets arranged outwardly along the water-blocking filter wall. The outer surface of each of the four fixed nets is provided with a non-woven geotextile separator layer A. The four fixed nets form three accommodating spaces, which are sequentially filled with a zeolite layer, a ceramsite layer, and a gravel layer from the outer wall of the water-blocking filter wall toward the inner wall of the storage well.

[0012] As a preferred embodiment of the present invention, a micro-nano aeration device is installed on the bottom wall of the regulating well, located inside the water-blocking filter wall, and an exhaust pipe is provided at the top of the regulating well.

[0013] As a preferred embodiment of the present invention, a fan is installed inside the exhaust pipe, the exhaust pipe is configured with multiple bends, and the end of the exhaust pipe away from the storage well opens downwards.

[0014] As a preferred embodiment of the present invention, a seepage dam is provided in the storage tank. The seepage dam includes a permeable gabion mesh that divides the storage tank. The permeable gabion mesh is filled with stones. The cross-section of the permeable gabion mesh and the stacked stones is an isosceles trapezoidal shape. The gaps between the stones are filled with absorbent particles and compacted. A non-woven geotextile separation layer B is laid on the surface of the permeable gabion mesh. A Reno mattress layer is laid on the surface of the non-woven geotextile separation layer B.

[0015] As a preferred embodiment of the present invention, the inlet and outlet of the booster pump are respectively connected to a booster pipe and a discharge pipe, and the inlet and outlet of the reuse pump are respectively connected to a pump outlet pipe and a reuse pipe.

[0016] The riser pipe runs through the bottom of the storage well and extends below the micro-nano aeration device; the discharge pipe extends into the storage tank and is located on one side of the seepage dam; the pump outlet pipe extends into the storage tank and is located on the other side of the seepage dam; and the reuse pipe is connected to the waterworks.

[0017] As a preferred embodiment of the present invention, the regulating tank is provided with several emergent plant purification zones and submerged plant purification zones, which are alternately distributed in the regulating tank. The end of the pump outlet pipe away from the reuse pump crosses the emergent plant purification zones and submerged plant purification zones and extends to the bottom of the water body in the regulating tank.

[0018] Another technical problem to be solved by the present invention is to provide a method for regulating and reusing first-flush rainwater interception and sewage systems for watershed management, comprising the following steps:

[0019] A. Initial construction;

[0020] Aa. Clean the river channel and dig ditches and canals, and build diversion channels, storage ponds, storage wells and diversion channels;

[0021] Ab. Open a diversion port and build a interception zone in the front section of the diversion. Build coarse and fine screens in the interception zone, one in front and one behind.

[0022] Ac. Install micro-nano aeration devices in the storage well and build a water-blocking filter wall with seepage holes. Build four sets of fixed nets on the outside of the water-blocking filter wall. Lay a non-woven geotextile separation layer A on the outside of each fixed net for isolation, and fill it with zeolite layer, ceramsite layer and gravel layer in sequence.

[0023] Ad. Construct a seepage dam within the storage tank to divide it into two parts;

[0024] Ae. Plant several emergent plant purification zones and submerged plant purification zones alternately on the side of the watershed within the regulating reservoir.

[0025] Af. The intelligent control cabinet, gate A, gate B and water quality monitoring instruments are combined to form a sewage interception system. Gate A and water quality monitoring instruments are built at the diversion port in the front section of the diversion, and gate B is built between the front section and the rear section of the diversion.

[0026] B. Interception and purification of initial and subsequent rainwater;

[0027] Ba, initial rainwater interception and purification;

[0028] Ba1, the initial rainwater is diverted to the front section of the interception zone and undergoes preliminary interception by coarse and fine screens to complete the primary purification;

[0029] After Ba2 flows through the interception zone, the rainwater is detected by water quality monitoring instruments and the detection results are transmitted to the intelligent control cabinet. When the concentration of mixed sewage is determined to be greater than the control index, the intelligent control cabinet controls gate A to be open and gate B to be closed.

[0030] Ba3. Rainwater can be introduced into the storage well through the inlet and the diversion channel. It is filtered by the water filter components, which intercept pollutants from large to small in sequence. Then, it enters the water-blocking filter wall through the seepage holes and is purified again by the micro-nano aeration device.

[0031] Ba4. The water that has undergone secondary purification is pumped out by the lift pump through the lift pipe and discharged into the storage tank through the discharge pipe.

[0032] Bb, Post-continuous rainwater interception and purification;

[0033] Bb1. Later rainwater passes through the interception zone and undergoes initial interception and purification via coarse and fine screens.

[0034] Bb2. After flowing through the interception zone, the rainwater is detected by water quality monitoring instruments and the detection results are transmitted to the intelligent control cabinet. When the concentration of mixed sewage is determined to be less than the control index, the intelligent control cabinet controls gate A to be closed and gate B to be open.

[0035] Bb3, Later rainwater is directly discharged into the storage tank through the downstream section of the diversion;

[0036] C. Re-purification and reuse of initial and subsequent rainwater after interception and purification;

[0037] After being intercepted and purified, Ca, initial rainwater, and subsequent rainwater are all discharged into the regulating reservoir, where they are further purified through seepage filtration via the seepage dam.

[0038] Cb. The water passing through the seepage dam undergoes further sedimentation and slow adsorption degradation through emergent and submerged plant purification zones.

[0039] Cc. Rainwater that has undergone multiple purification processes flows into the regulating reservoir. It can be pumped out through the discharge pipe by the reuse pump and then connected to the waterworks for reuse. Alternatively, it can be discharged into the watershed through the gate on the regulating reservoir.

[0040] Compared with the prior art, the beneficial effects that this invention can achieve are:

[0041] 1. Rainwater is detected by water quality testing instruments and the test results are transmitted to the intelligent control cabinet. Based on whether the concentration of mixed sewage is greater than or less than the control index, the intelligent control cabinet controls the opening and closing status of gate A and gate B. The heavily polluted initial rainwater is intercepted and treated, while the later rainwater with better water quality is directly discharged into the storage tank, realizing the separation and treatment of initial and later rainwater.

[0042] 2. Both initial and subsequent rainwater are initially intercepted by coarse and fine screens. After being introduced into the storage well, the initial rainwater passes through a gravel layer, a ceramic granule layer, and a zeolite layer for filtration. Then, it enters the water-blocking filter wall through infiltration holes and undergoes secondary purification by a micro-nano aeration device. This interception and treatment of the initial rainwater with a high pollution load effectively reduces the pollution of the river by the initial rainwater.

[0043] 3. Initial and subsequent rainwater are mixed in the storage tank after interception and purification. The water is filtered through the seepage dam, where adsorbed particulate matter is further purified. The water then undergoes further sedimentation and slow adsorption degradation through emergent and submerged plant purification zones. Rainwater is recycled and reused, and rainwater runoff is regulated.

[0044] 4. After multiple purification processes, rainwater flows into the storage tank and can be pumped out through the discharge pipe via a reuse pump, and then connected to the waterworks for reuse. Alternatively, it can be discharged into the watershed through the gate on the storage tank. This process regulates rainwater runoff, enhances storage capacity, reduces the initial impact load of rainwater during the rainy season, reduces non-point source pollution, improves the quality of river water environment, and has the function of flood control and peak reduction in river channels. During the dry season, the application of this technology can ensure the ecological base flow of the river and promote the protection of the aquatic ecosystem. Attached Figure Description

[0045] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0046] Figure 2 This is a three-dimensional schematic diagram of the diversion channel of the present invention.

[0047] Figure 3 This is a three-dimensional schematic diagram of the regulating well of the present invention;

[0048] Figure 4 This is a schematic diagram of a partial cross-sectional three-dimensional view of the regulating well of the present invention;

[0049] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle;

[0050] Figure 6 This is a schematic cross-sectional view of the seepage dam structure of the present invention;

[0051] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B;

[0052] Figure 8 This is a block diagram illustrating the working principle of the sewage interception system of the present invention;

[0053] Figure 9 This is a schematic diagram of the sewage interception system of the present invention.

[0054] The components include: 1. Storage tank; 11. Emergent plant purification zone; 12. Submerged plant purification zone; 2. Diversion channel; 21. Front diversion section; 22. Rear diversion section; 23. Diversion outlet; 24. Interception zone; 25. Coarse screen; 26. Fine screen; 3. Storage well; 31. Water-retaining filter wall; 311. Seepage hole; 32. Filter assembly; 321. Fixed net; 322. Non-woven geotextile separation layer A; 323. Zeolite layer; 324. Ceramsite layer; 325. Gravel layer; 33. 1. Micro-nano aeration device; 34. Exhaust pipe; 35. Blower; 4. Diversion channel; 5. Lift pump; 51. Lift pipe; 52. Discharge pipe; 6. Reuse pump; 61. Pump outlet pipe; 62. Reuse pipe; 7. Seepage dam; 71. Permeable gabion mesh; 72. Stone material; 73. Adsorbent particles; 74. Non-woven geotextile separation layer B; 75. Reno mattress layer; 8. Sewage interception system; 81. Intelligent control cabinet; 82. Gate A; 83. Gate B; 84. Water quality testing instruments. Detailed Implementation

[0055] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0056] Example:

[0057] like Figure 1 - Figure 9As shown, this embodiment proposes a rainwater interception system and a storage and reuse method for watershed management. To solve the above-mentioned technical problems, the present invention provides the following technical solution: A rainwater interception system for watershed management includes a diversion channel 2, a storage tank 1, and a sewage interception system 8. The storage tank 1 is constructed on the bank of the watershed and located at the end of the diversion channel 2. A storage well 3 is provided between the diversion channel 2 and the storage tank 1. A guide channel 4 is provided between the diversion channel 2 and the storage well 3. A lift pump 5 and a reuse pump 6 are installed on the storage well 3. The lift pump 5 pumps water out of the storage well 3, and the reuse pump 6 pumps water out of the storage tank 1. A floodgate is provided on the side of the storage tank 1 facing the watershed.

[0058] The diversion channel 2 includes a diversion front section 21 and a diversion rear section 22. A diversion port 23 is provided on one side of the connection between the diversion front section 21 and the diversion rear section 22. The two ends of the diversion channel 4 correspond to the diversion port 23 and the storage well 3, respectively. The diversion front section 21 has a interception zone 24. A coarse screen 25 and a fine screen 26 are installed in the interception zone 24.

[0059] The sewage interception system 8 includes an intelligent control cabinet 81, gate A82, gate B83, and a water quality monitoring instrument 84. Gate A82 is installed in the diversion front section 21 and is used to open and close the diversion port 23. Gate B83 is installed between the diversion front section 21 and the diversion rear section 22 to realize the connection and disconnection between the diversion front section 21 and the diversion rear section 22. The water quality monitoring instrument 84 is installed in the diversion front section 21 at the position corresponding to the diversion port 23 and is used to detect mixed rainwater. The intelligent control cabinet 81 receives the detection results of the water quality monitoring instrument 84 and controls gate A82 and gate B83 in real time.

[0060] In a preferred embodiment of the present invention, the interception zone 24 is disposed on the front section 21 of the diversion, the diversion port 23 is located between the interception zone 24 and the rear section 22 of the diversion, the coarse grid 25 is disposed in front of the fine grid 26, and the fine grid 26 has multiple bends.

[0061] Specifically, both initial and subsequent rainwater flow through interception zone 24. As it flows through interception zone 24, coarse screen 25 intercepts medium to large-sized, non-biodegradable waste in the sewage, while fine screen 26 intercepts smaller-sized waste. This initial interception by coarse and fine screens 25 completes primary purification. The fine screen 26 is designed with multiple bends to form either an S-shape or an M-shape to achieve the largest possible cross-sectional area for the same water width. Waste intercepted by coarse and fine screens 25 is collected and disposed of, preventing any significant debris from proceeding to the next stage.

[0062] In a preferred embodiment of the present invention, a water-blocking filter wall 31 is installed inside the water-blocking filter wall 3. The surface of the water-blocking filter wall 31 is provided with a plurality of evenly distributed seepage holes 311. The water-blocking filter wall 31 has a frustum-shaped structure. A water-filtering assembly 32 is provided on the outer wall of the water-blocking filter wall 31. The water-filtering assembly 32 includes four sets of fixed nets 321 arranged outwardly along the water-blocking filter wall 31. A non-woven geotextile separating layer A322 is provided on the outer surface of each of the four fixed nets 321. Three receiving spaces are formed between the four fixed nets 321 and are sequentially filled with a zeolite layer 323, a ceramsite layer 324, and a gravel layer 325 from the outer wall of the water-blocking filter wall 31 toward the inner wall of the water-blocking filter wall 3.

[0063] Specifically, the water flow introduced into the storage well 3 through the inlet 23 and the diversion channel 4 passes through the gravel layer 325, the ceramsite layer 324 and the zeolite layer 323 in sequence. The porosity of the gravel layer 325, the ceramsite layer 324 and the zeolite layer 323 decreases in sequence. The water flow is filtered through the gravel layer 325, the ceramsite layer 324 and the zeolite layer 323 in sequence, intercepting pollutants from large to small in sequence. Then, it enters the water-blocking filter wall 31 through the seepage hole 311 for filtration and purification.

[0064] In a preferred embodiment of the present invention, a micro-nano aeration device 33 located in the water-blocking filter wall 31 is installed on the bottom wall of the storage well 3, and an exhaust pipe 34 is provided on the top of the storage well 3.

[0065] Specifically, the water flowing into the water-blocking filter wall 31 through the seepage holes 311 is purified by the micro-nano aeration device 33. The micro-nano aeration device 33 is pressurized by a pump, and the high-speed rotation of the aeration stones inside the aeration head creates a negative pressure zone. After the air enters through the air inlet, it is cut into micro-nano bubbles of 10-200nm by high-speed rotation, thereby achieving rapid and efficient dissolution of gas into the water. Because the bubbles are small, they are not affected by the solubility of air in water, nor are they limited by external conditions such as temperature and pressure. They can stay in the sewage for a long time and have a good flotation effect. They have the advantages of eliminating organic pollution and black odor, reducing the nutrient content of water, eliminating algal blooms, improving water color and transparency, and reducing endogenous pollution in bottom sediment. They are also conducive to the degradation of various pollutants in the initial rainwater, thus purifying the water body more quickly.

[0066] In a preferred embodiment of the present invention, a fan 35 is installed inside the exhaust pipe 34, the exhaust pipe 34 is configured with multiple bends, and the end of the exhaust pipe 34 away from the storage well 3 opens downward.

[0067] Specifically, under the action of exhaust pipe 34 and fan 35, the gas pressure in the storage well 3 can be kept balanced when water enters and exits, and the concentration of harmful gases in the pool can be reduced. The exhaust pipe 34 has multiple bends and one end is set to open downwards to prevent rainwater backflow.

[0068] In a preferred embodiment of the present invention, a seepage dam 7 is provided in the storage tank 1. The seepage dam 7 includes a permeable gabion mesh 71 that divides the storage tank 1. The permeable gabion mesh 71 is filled with stones 72. The cross section of the permeable gabion mesh 71 and the stones 72 after being piled up is an isosceles trapezoidal shape. The gaps in the stones 72 are filled with absorbent particles 73 and compacted. A non-woven geotextile separation layer B74 is laid on the surface of the permeable gabion mesh 71. A Reno mattress layer 75 is laid on the surface of the non-woven geotextile separation layer B74.

[0069] Specifically, the main body of the seepage dam 7 is composed of permeable gabion mesh 71 and stones 72, which divides the storage tank 1 into two parts. After filling the gaps of the stones 72 with absorbent particles 73, a non-woven geotextile separation layer B74 is first laid to prevent the loss of absorbent particles 73, and then a Reno mattress layer 75 is laid to form weight and protection. The initial rainwater and the later rainwater are discharged into the storage tank 1 after interception and purification, and are filtered through the seepage dam 7. The absorbent particles 73 further purify the water.

[0070] In a preferred embodiment of the present invention, the inlet and outlet of the booster pump 5 are respectively connected and installed with a booster pipe 51 and a discharge pipe 52, and the inlet and outlet of the reuse pump 6 are respectively connected and installed with a pump outlet pipe 61 and a reuse pipe 62.

[0071] Specifically, the lift pipe 51 penetrates the bottom of the storage well 3 and extends to the bottom of the micro-nano aeration device 33; the discharge pipe 52 extends into the storage tank 1 and is located on one side of the seepage dam 7; the pump outlet pipe 61 extends into the storage tank 1 and is located on the other side of the seepage dam 7; and the reuse pipe 62 is connected to the waterworks. The water that has undergone secondary purification is pumped out by the lift pump 5 through the lift pipe 51 and then discharged into the storage tank 1 through the discharge pipe 52. The rainwater purified in the storage tank 1 can be pumped out by the reuse pump 6 through the pump outlet pipe 61 and then connected to the waterworks for reuse through the reuse pipe 62, thus realizing the recycling and utilization of rainwater.

[0072] In a preferred embodiment of the present invention, a plurality of emergent plant purification belts 11 and submerged plant purification belts 12 are arranged in the regulating tank 1. The emergent plant purification belts 11 and submerged plant purification belts 12 are alternately distributed in the regulating tank 1. The end of the pump outlet pipe 61 away from the reuse pump 6 crosses the emergent plant purification belts 11 and submerged plant purification belts 12 and extends to the bottom of the water body in the regulating tank 1.

[0073] Specifically, the water passing through the seepage dam 7 undergoes further sedimentation and slow adsorption degradation via the emergent plant purification zone 11 and the submerged plant purification zone 12.

[0074] Another technical problem to be solved by the present invention is to provide a method for regulating and reusing first-flush rainwater interception and sewage systems for watershed management, comprising the following steps:

[0075] A. Initial construction;

[0076] Aa. Clean the river channel and dig ditches and ditches, and construct diversion channel 2, storage pond 1, storage well 3 and diversion channel 4;

[0077] Ab. A diversion port 23 is opened in the diversion section 21 and a interception zone 24 is constructed. A coarse screen 25 and a fine screen 26 are constructed in front of and behind the interception zone 24.

[0078] Ac. A micro-nano aeration device 33 is installed in the storage well 3, and a water-blocking filter wall 31 with seepage holes 311 is constructed. Four sets of fixed nets 321 are constructed on the outside of the water-blocking filter wall 31. A non-woven geotextile separation layer A322 is laid on the outside of each fixed net 321 for isolation, and zeolite layer 323, ceramsite layer 324, and gravel layer 325 are filled in sequence.

[0079] Ad. Construct a seepage dam 7 within the regulating reservoir 1 to divide the regulating reservoir 1 into two parts;

[0080] Ae. Plant several emergent plant purification zones 11 and submerged plant purification zones 12 alternately on the side of the watershed near the regulating reservoir 1.

[0081] Af. The intelligent control cabinet 81, gate A82, gate B83 and water quality testing instrument 84 are combined to form a sewage interception system 8. Gate A82 and water quality testing instrument 84 are built at the diversion port 23 in the diversion front section 21, and gate B83 is built between the diversion front section 21 and the diversion rear section 22.

[0082] B. Interception and purification of initial and subsequent rainwater;

[0083] Ba, initial rainwater interception and purification;

[0084] Ba1, the initial rainwater is diverted at the front section 21 and flows through the interception zone 24, where it is initially intercepted by the coarse screen 25 and the fine screen 26, completing the primary purification.

[0085] After Ba2 flows through the interception zone 24, the rainwater is detected by the water quality detection instrument 84 and the detection results are transmitted to the intelligent control cabinet 81. When the concentration of mixed sewage is determined to be greater than the control index, the intelligent control cabinet 81 controls the gate A82 to be open and the gate B83 to be closed.

[0086] Ba3, rainwater can be introduced into the storage well 3 through the inlet 23 and the diversion channel 4, and filtered by the filter component 32 to intercept pollutants from large to small in sequence. After entering the water-blocking filter wall 31 through the seepage hole 311, it is purified again by the micro-nano aeration device 33.

[0087] Ba4. The water after secondary purification is pumped out by the lift pump 5 through the lift pipe 51 and discharged into the storage tank 1 through the discharge pipe 52.

[0088] Bb, Post-continuous rainwater interception and purification;

[0089] Bb1. Later rainwater passes through interception zone 24 and undergoes initial interception via coarse screen 25 and fine screen 26, completing primary purification;

[0090] Bb2, after flowing through the interception zone 24, the rainwater is detected by the water quality detection instrument 84 and the detection results are transmitted to the intelligent control cabinet 81. When it is determined that the concentration of mixed sewage is less than the control index, the intelligent control cabinet 81 controls the gate A82 to be closed and the gate B83 to be open.

[0091] Bb3, Later rainwater is directly discharged into the regulating reservoir 1 through the diversion section 22;

[0092] D. Re-purification and reuse of initial and subsequent rainwater after interception and purification;

[0093] After interception and purification, Ca, initial rainwater and subsequent rainwater are all discharged into the regulating reservoir 1, and then purified again by seepage filtration through the seepage dam 7.

[0094] Cb. The water passing through the seepage dam 7 undergoes further sedimentation and slow adsorption degradation through the emergent plant purification zone 11 and the submerged plant purification zone 12.

[0095] Cc. Rainwater that has undergone multiple purification processes flows into the regulating reservoir 1. It can be pumped out through the discharge pipe 61 by the reuse pump 6, and then connected to the waterworks for reuse through the reuse pipe 62. Alternatively, it can be discharged into the watershed through the gate on the regulating reservoir 1.

[0096] Working principle and usage process of this invention:

[0097] First, complete all construction work;

[0098] In the early stages of rain, the volume of initial rainwater and mixed sewage overflow is relatively small. It is diverted through the diversion section 21 of the diversion channel 2. When it flows through the interception zone 24, it is intercepted by the coarse screen 25 for medium and large-sized waste that is difficult to degrade, and by the fine screen 26 for smaller-sized waste. The initial interception by the coarse screen 25 and the fine screen 26 completes the primary purification.

[0099] Rainwater is monitored by a water quality monitoring instrument 84. The water quality monitoring instrument 84 is set with threshold values, which are set according to the actual conditions of the location of use, as shown in Table 1 below:

[0100] Table 1. Basic Standard Limits for Surface Water Environmental Quality Standards (Unit: mg / L)

[0101]

[0102] In this invention, an SS concentration of 50 mg / L in wastewater is used as an example for illustration:

[0103] Due to severe pollution from the initial rainwater and mixed sewage overflow, with a mixed sewage concentration exceeding 50 mg / L, after flowing through interception zone 24, the rainwater is monitored by water quality testing instrument 84, and the test results are transmitted to intelligent control cabinet 81. Intelligent control cabinet 81 controls gate A82 to be open and gate B83 to be closed. Rainwater can fall into diversion channel 4 through diversion port 23, and is then introduced into storage well 3 from diversion channel 4, located outside the water-blocking filter wall 31, and subsequently passes through gravel layer 325. The porosity of the expanded clay layer 324 and zeolite layer 323, the gravel layer 325, the expanded clay layer 324 and the zeolite layer 323 decreases sequentially. The water flows through the gravel layer 325, the expanded clay layer 324 and the zeolite layer 323 in sequence for filtration, intercepting pollutants from large to small in sequence. After entering the water-blocking filter wall 31 through the seepage holes 311, it undergoes secondary purification again by the micro-nano aeration device 33. The water after secondary purification is pumped out by the lift pump 5 through the lift pipe 51, and then discharged into the regulating tank 1 through the discharge pipe 52.

[0104] The quality of rainwater and mixed rainwater and sewage is relatively good after the initial rain. When it passes through the interception zone 24, it is initially intercepted by coarse screen 25 and fine screen 26 to complete the primary purification. As time goes by, the amount of rainwater increases until the concentration of mixed sewage is less than 50mg / L. At this time, the water quality detection instrument 84 detects the rainwater and transmits the detection results to the intelligent control cabinet 81. The intelligent control cabinet 81 controls the gate A82 to be closed and the gate B83 to be open. The rainwater can be directly discharged into the regulating tank 1 through the diversion section 22.

[0105] After purification, both the initial and subsequent rainwater are discharged into the regulating tank 1 and mixed together. By intercepting the initial rainwater with a high pollution load concentration and discharging it into the regulating tank 1 after purification, the relatively clean subsequent rainwater overflows into the regulating tank 1, thus achieving the separation and treatment of initial and subsequent rainwater. This effectively collects the initial rainwater, reduces its pollution of the river, improves the efficiency of water purification and treatment, and increases the ecological flow of the river.

[0106] After initial and subsequent rainwater is intercepted and purified, it is mixed in the storage tank 1 and filtered through the infiltration dam 7. The adsorbed particulate matter 73 further purifies the water. Then, it undergoes sufficient sedimentation and slow adsorption degradation through the emergent plant purification zone 11 and the submerged plant purification zone 12. Rainwater is recycled and reused, and rainwater runoff is regulated.

[0107] Rainwater, after undergoing multiple purification processes, flows into the infiltration dam 7 within the regulating reservoir 1. It can be pumped out via the reuse pump 6 through the discharge pipe 61, and then connected to the waterworks for reuse via the reuse pipe 62. Alternatively, it can be discharged into the watershed through the gate on the regulating reservoir 1. This process regulates rainwater runoff, enhances regulation capacity, reduces initial rainfall impact load during the rainy season, reduces non-point source pollution, improves river water quality, and has a flood control and peak reduction function. During the dry season, this technology can ensure the ecological base flow of the river and promote the protection of the aquatic ecosystem.

[0108] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0109] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A first-flush sewage interception system for watershed management, characterized in that, The system includes a diversion channel (2), a storage tank (1), and a sewage interception system (8). The storage tank (1) is built on the bank of the watershed and located at the end of the diversion channel (2). A storage well (3) is set between the diversion channel (2) and the storage tank (1). A diversion channel (4) is set between the diversion channel (2) and the storage well (3). A lift pump (5) and a reuse pump (6) are installed on the storage well (3). The lift pump (5) pumps water out of the storage well (3), and the reuse pump (6) pumps water out of the storage tank (1). A floodgate is set on the side of the storage tank (1) facing the watershed. The diversion channel (2) includes a diversion front section (21) and a diversion rear section (22). A diversion port (23) is provided on one side of the connection between the diversion front section (21) and the diversion rear section (22). The two ends of the diversion channel (4) correspond to the diversion port (23) and the storage well (3) respectively. The diversion front section (21) has a interception zone (24). A coarse screen (25) and a fine screen (26) are installed in the interception zone (24). The interception system (8) includes an intelligent control cabinet (81), gate A (82), gate B (83), and a water quality testing instrument (84). Gate A (82) is located in the front section (21) of the diversion and is used to open and close the diversion port (23). Gate B (83) is located between the front section (21) and the rear section (22) of the diversion and is used to open and close the diversion port (23). The water quality testing instrument (84) is installed in the front section (21) at the position corresponding to the diversion port (23) and is used to detect mixed rainwater. The intelligent control cabinet (81) receives the detection results of the water quality testing instrument (84) and controls gate A (82) and gate B (83) in real time. The storage well (3) is equipped with a water-blocking filter wall (31). The surface of the water-blocking filter wall (31) is provided with a number of evenly distributed seepage holes (311). The water-blocking filter wall (31) is a frustum-shaped structure. The outer wall of the water-blocking filter wall (31) is provided with a water-filtering assembly (32). The water-filtering assembly (32) includes four sets of fixed nets (321) arranged outward along the water-blocking filter wall (31). The outer surface of each of the four fixed nets (321) is provided with a non-woven geotextile separating layer A (322). The four fixed nets (321) form three accommodating spaces and are filled with a zeolite layer (323), a ceramsite layer (324), and a gravel layer (325) in sequence from the outer wall of the water-blocking filter wall (31) towards the inner wall of the storage well (3). The storage well (3) is equipped with a micro-nano aeration device (33) located in the water-blocking filter wall (31) on the bottom wall of the storage well (3). The top of the storage well (3) is provided with an exhaust pipe (34). A fan (35) is installed in the exhaust pipe (34). The exhaust pipe (34) is bent in multiple sections, and the end of the exhaust pipe (34) away from the storage well (3) opens downward. The storage tank (1) is equipped with a seepage dam (7), which includes a permeable gabion mesh (71) that divides the storage tank (1). The permeable gabion mesh (71) is filled with stones (72), and the gaps in the stones (72) are filled with absorbent particles (73) and compacted. The surface of the permeable gabion mesh (71) is covered with a non-woven geotextile separation layer B (74), and the surface of the non-woven geotextile separation layer B (74) is covered with a Reno mattress layer (75). The inlet and outlet of the booster pump (5) are respectively connected to a booster pipe (51) and a discharge pipe (52). The inlet and outlet of the reuse pump (6) are respectively connected to a pump outlet pipe (61) and a reuse pipe (62). The booster pipe (51) passes through the bottom of the storage well (3) and extends to the bottom of the micro-nano aeration device (33). The discharge pipe (52) extends into the storage tank (1) and is located on one side of the seepage dam (7). The pump outlet pipe (61) extends into the storage tank (1) and is located on the other side of the seepage dam (7). The reuse pipe (62) is connected to the waterworks. The regulating reservoir (1) is equipped with several emergent plant purification zones (11) and submerged plant purification zones (12), which are alternately distributed in the regulating reservoir (1).

2. The initial rainwater interception system for watershed management according to claim 1, characterized in that: The interception zone (24) is set on the front section (21) of the diversion, the diversion port (23) is located between the interception zone (24) and the rear section (22) of the diversion, the coarse grid (25) is set on the front side of the fine grid (26), and the fine grid (26) has multiple bends.

3. The first-flush sewage interception system for watershed management according to claim 1, characterized in that: The cross-section of the permeable gabion mesh (71) and the piled stones (72) is an isosceles trapezoid shape.

4. A rainwater interception system for watershed management according to claim 1, characterized in that: The pump outlet pipe (61) extends away from the reuse pump (6) by crossing the emergent plant purification zone (11) and the submerged plant purification zone (12) and extending below the water body in the storage tank (1).

5. A method for regulating and reusing first-flush rainwater interception and sewage treatment systems for watershed management according to any one of claims 1-4, characterized in that: Includes the following steps: A. Initial construction; Aa. Clean the river channel and dig ditches to build a diversion channel (2), a storage pond (1), a storage well (3) and a diversion channel (4). Ab. Open a diversion port (23) and construct a interception zone (24) in the front section (21). Construct a coarse screen (25) and a fine screen (26) in the interception zone (24). Ac, install a micro-nano aeration device (33) in the storage well (3) and build a water-blocking filter wall (31) with seepage holes (311). Build four sets of fixed nets (321) on the outside of the water-blocking filter wall (31). Lay a non-woven geotextile separation layer A (322) on the outside of each fixed net (321) for isolation, and fill it in sequence with zeolite layer (323), ceramsite layer (324), and gravel layer (325). Ad, Construct a seepage dam (7) inside the storage tank (1) to divide the storage tank (1) into two parts; Ae. Plant several emergent plant purification belts (11) and submerged plant purification belts (12) alternately on the side of the watershed in the regulating reservoir (1). Af. The intelligent control cabinet (81), gate A (82), gate B (83) and water quality testing instrument (84) are combined to form a sewage interception system (8). Gate A (82) and water quality testing instrument (84) are built at the diversion port (23) in the diversion front section (21), and gate B (83) is built between the diversion front section (21) and the diversion rear section (22). B. Interception and purification of initial and subsequent rainwater; Ba, initial rainwater interception and purification; Ba1, the initial rainwater is diverted in the first section (21), flows through the interception zone (24), and is initially intercepted by the coarse screen (25) and fine screen (26) to complete the primary purification; After Ba2 flows through the interception zone (24), the rainwater is detected by the water quality detection instrument (84) and the detection results are transmitted to the intelligent control cabinet (81). When the concentration of mixed sewage is determined to be greater than the control index, the intelligent control cabinet (81) controls the gate A (82) to be open and the gate B (83) to be closed. Ba3, rainwater can be introduced into the storage well (3) through the inlet (23) and the diversion channel (4), filtered by the filter component (32), intercepting pollutants from large to small in sequence, and then entering the water-blocking filter wall (31) through the seepage hole (311), and then undergoing secondary purification by the micro-nano aeration device (33); Ba4. The water after secondary purification is pumped out by the lift pump (5) through the lift pipe (51) and discharged into the storage tank (1) through the discharge pipe (52). Bb, Post-continuous rainwater interception and purification; Bb1. Later rainwater passes through the interception zone (24) and is initially intercepted by the coarse screen (25) and fine screen (26), completing the primary purification; Bb2, after flowing through the interception zone (24), the rainwater is detected by the water quality detection instrument (84) and the detection results are transmitted to the intelligent control cabinet (81). When the concentration of mixed sewage is less than the control index, the intelligent control cabinet (81) controls the gate A (82) to be closed and the gate B (83) to be open. Bb3, Later rainwater is directly discharged into the storage tank (1) through the later section of the diversion (22); C. Re-purification and reuse of initial and subsequent rainwater after interception and purification; After interception and purification, Ca, initial rainwater and subsequent rainwater are all discharged into the regulating tank (1), and are further purified by seepage filtration through the seepage dam (7); Cb. The water passing through the seepage dam (7) undergoes further sedimentation and slow adsorption degradation through the emergent plant purification zone (11) and the submerged plant purification zone (12); Cc. Rainwater that has undergone multiple purification processes flows into the regulating reservoir (1). It can be pumped out through the pumping pipe (61) by the reuse pump (6) and then connected to the waterworks for reuse through the reuse pipe (62). Alternatively, it can be discharged into the watershed through the gate on the regulating reservoir (1).

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