Rainwater-waste separation and purification device and method based on solar electrolysis and water pressure drive

Abstract

The present invention relates to a rainwater-sewage separation and purification device and method based on solar electrolysis and water pressure drive. The device includes: a solar electrolytic cell system and a rainwater-sewage separation system; the solar electrolytic cell system includes a photovoltaic panel, a control sensor, an energy storage module and a grate circuit module; the rainwater-sewage separation system includes a wellbore, a plurality of revolving doors installed at the opening of the upper end of the wellbore, a rainwater collection pipe arranged on the outer wall of the middle section of the wellbore, and a sewage pipe arranged on the outer wall of the lower end of the wellbore; the grate circuit module is arranged in the wellbore; a floating moving component is arranged in the wellbore; the floating moving component includes a baffle arranged corresponding to the inlet of the sewage pipe and a float for driving the baffle to move under the action of buoyancy. The present invention can efficiently degrade organic pollutants and nitrogen pollutants in the initial rainwater in situ, realize the automatic separation of the initial polluted rainwater and the middle and late rainwater, collect and clean and improve the efficiency of rainwater resource utilization, and help the construction of sponge cities.

Description

Technical Field

[0001] The present invention relates to the field of ecological environment technology, and in particular to a rainwater-sewage separation and purification device and method based on solar electrolysis and water pressure drive. Background Art

[0002] As an advanced urban water environment management concept, the construction of sponge city follows important principles such as ecological priority, combines natural approaches with artificial measures, and maximizes the purification and storage of rainwater in urban areas through low-impact development. In the construction of sponge city, the control of non-point source pollution of initial rainwater can achieve the phased goal of SS removal rate of 40% to 60%, thereby improving the mobility and flexibility of rainwater resource utilization.

[0003] However, due to the randomness of the natural rainfall process, the diversity of surface pollutants and the uncertainty of hydrological geomorphology, there are still limitations in the process of rainwater resource utilization. Specifically, the initial rainwater contains high concentrations of organic matter and nitrogen pollutants entrained and adsorbed by surface particles, which hinder the resource utilization of rainwater, and its large amount of siltation will also lead to the formation of black and smelly water bodies; the mid- and late-stage rainwater is cleaner than the initial rainwater and can be used directly after simple treatment, but it is difficult to achieve low-cost automatic separation of the two. At the same time, in the current combined or separate drainage system, surface rainwater directly flows into the sewage pipe network or directly discharges into rivers, which increases the load on sewage treatment plants and natural water bodies, and causes a large amount of waste of clean rainwater resources.

[0004] Therefore, how to achieve the automatic separation of initial rainwater and the green degradation of intercepted pollutants is a key technical issue to assist the construction of sponge cities and realize the efficient and clean use of rainwater resources. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a rainwater-sewage separation and purification device and method based on solar electrolysis and water pressure drive.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect of the present invention, a rainwater-sewage separation and purification device based on solar electrolysis and water pressure drive is disclosed.

[0008] Specifically, the device includes: a solar electrolytic cell system and a rainwater-sewage separation system;

[0009] The solar electrolytic cell system comprises a photovoltaic panel, a control sensor, an energy storage module and a grate circuit module; the photovoltaic panel is connected to the energy storage module, and the energy storage module is connected to the grate circuit module through the control sensor;

[0010] The rainwater and sewage separation system includes a well, a plurality of revolving doors installed at the opening at the upper end of the well, a rainwater collection pipe arranged on the outer wall of the middle section of the well, and a sewage pipe arranged on the outer wall of the lower end of the well; the grate circuit module is arranged in the well; a floating moving component is arranged in the well; the floating moving component includes a baffle arranged corresponding to the inlet of the sewage pipe and a float used to drive the baffle to move under the action of buoyancy.

[0011] Furthermore, the bottom of the wellbore is provided with a seepage brick;

[0012] A sand settling step is arranged on the top of the infiltration brick.

[0013] Furthermore, the revolving door includes a rotating shaft, a door body rotatably matched with the rotating shaft, and a return spring connected between the door body and the rotating shaft.

[0014] Furthermore, the control sensor is used to monitor the working voltage status and the opening and closing status of the revolving door; and the energy storage module is a battery.

[0015] Furthermore, the shaft is an underground cylindrical structure.

[0016] Furthermore, an anti-backflow valve is provided on the rainwater collection pipe.

[0017] Furthermore, the float is connected to the baffle through a connecting rod;

[0018] One end of the connecting rod is connected to the float, and the other end is movably connected to the baffle;

[0019] The baffle is rotatably matched with the inner wall of the wellbore.

[0020] Furthermore, a limit plate is provided on the inner wall of the shaft.

[0021] Further, the grate circuit module includes an anode grate and a cathode grate;

[0022] The cathode grate is spiral-shaped; the anode grate comprises three parts, namely, a side electrode, a wire electrode and a bottom electrode, which are arranged in sequence. The side electrode is annular and placed in a vertical direction, the bottom electrode is flat, the wire electrode is extended upward from the bottom electrode, the cathode grate is located in the space surrounded by the side electrodes, and the wire electrode is wound on the cathode grate; the cathode grate is made of high-carbon steel, and the anode grate is made of polypyrrole material;

[0023] The grate circuit module is used to intercept pollutants in rainwater when the power is off, and is used to electrolyze pollutants when the power is on.

[0024] In a second aspect of the present invention, a separation and purification method of the above-mentioned rainwater-sewage separation and purification device is disclosed.

[0025] Specifically, the method includes:

[0026] S1. Separate rainwater and sewage during rainfall

[0027] S11, when the amount of rainwater is less than the first rainwater threshold, the revolving door is closed, and the rainwater flows into the wellbore along the gap on the surface of the revolving door;

[0028] S12, when the amount of rainwater is greater than the first rainwater threshold, the revolving door rotates open with the rotating shaft as the axis, the control sensor disconnects the grate circuit module, the rainwater flows into the wellbore, and some solid matter carried by the rainwater is intercepted by the rotating shaft;

[0029] S13, after the rainwater flows into the wellbore, it passes through the grate circuit module, and the grate circuit module intercepts the surface particles in the rainwater;

[0030] S14, rainwater flows to the bottom of the wellbore. Initially, rainwater is directly discharged into the sewage network through the sewage pipe. When the water level in the wellbore rises to a certain height, the float drives the baffle to rotate as the water level rises. The baffle seals the water inlet of the sewage pipe, and the rainwater in the wellbore is no longer discharged from the sewage pipe.

[0031] S15, the rainwater in the wellbore continues to rise to the water inlet of the rainwater collection pipe, enters the rainwater collection pipe and is sent to the city's clean rainwater storage system;

[0032] S16. When the amount of rainwater is less than the first rainwater threshold again, the revolving door is closed, the water level in the wellbore drops, the float drives the baffle to drop, the water inlet of the sewage pipe is opened, part of the rainwater in the wellbore flows out from the sewage pipe, and the remaining rainwater seeps out through the infiltration bricks at the bottom of the wellbore or evaporates naturally;

[0033] S2. In-situ degradation of pollutants when there is no rainfall

[0034] S21, the revolving door is in a closed state, the photovoltaic panel is in a pass state, the photovoltaic panel converts light energy into electrical energy and transmits it to the energy storage module through the control sensor to adjust the power for direct charging and energy storage. When the voltage of the energy storage module rises to the maintenance voltage, the control sensor adjusts the power to enter the energy storage module equalization charging state;

[0035] S22, after equalization is completed, the control sensor closes the grate circuit module and disconnects the energy storage circuit. The energy storage module outputs a stable voltage to the grate circuit module through the control sensor, and the grate circuit module electrolyzes the trapped pollutants;

[0036] S23, when the working voltage of the grate circuit module drops to the maintenance voltage point, the control sensor disconnects the grate circuit module and closes the energy storage module until the equalization charging is completed, and the control sensor closes the grate circuit module again and disconnects the energy storage module, and repeats the above-mentioned in-situ degradation process of pollutants.

[0037] Compared with the prior art, the advantages of the present invention are:

[0038] (1) In the prior art, rainwater is usually transported to sewage treatment plants through sewage pipe networks for treatment or directly discharged into natural water bodies, which increases the load on sewage treatment plants and natural water bodies and causes a large amount of clean rainwater resources to be wasted. In seasons with heavy rainfall, sewage treatment plants are all operating at full capacity. Compared with the traditional rainwater collection system with a single function, the present invention can purify and separate rainwater more quickly and efficiently, intercept and treat pollutants in situ through the grate circuit module, realize automatic separation of rainwater and sewage and recycling of clean rainwater, take into account the low-impact development of urban roads, and is suitable for use as a supporting facility of sponge cities, and can be used as a resource-based facility to replace local rainwater systems. The present invention can purify and separate rainwater through a simple structural design, relieve the direct discharge to the river or the receiving pressure of the sewage plant during heavy rain, and realize the preliminary recycling of clean rainwater, which also ensures the normal operation of the sewage pipe network and protects the environment. In addition, the collected clean rainwater can be used as reclaimed water directly for firefighting, agricultural irrigation and urban greening, greatly reducing the cost of rainwater treatment.

[0039] (2) The solar electrolytic cell system structure in the rainwater-sewage separation and purification device of the present invention is that the solar electrolytic cell system continuously stores energy and performs electrolysis on sunny days, ensuring normal operation on cloudy days and automatically operating on non-rainy days. The grate circuit module is automatically disconnected on rainy days to avoid wasting energy in the electrolysis reaction of water. The organic matter and ammonia nitrogen in the substances intercepted by the anode grate are oxidized, and the nitrate nitrogen and nitrite nitrogen in the substances intercepted by the cathode grate are reduced. The electrochemical system circuit is simple and does not require additional material and energy input. At the same time, it achieves efficient interception and degradation of pollutants, effectively ensuring the quality of overflowing rainwater.

[0040] (3) The solar electrolytic cell system structure in the rainwater-waste separation and purification device of the present invention, the cathode grate is spirally drooping, and the middle section of the anode grate is filament-shaped and wound on the cathode grate. On the one hand, such a design can have a larger cathode / anode area ratio, thereby enhancing the electrolytic reaction effect. On the other hand, such a design can increase the interception specific surface area of ​​the grate. The grate with a large specific surface area can intercept the particles entrained with pollutants through physical interception, electrosorption and chemical adsorption for electrochemical degradation. At the same time, the high porosity can ensure its water flow capacity, enhance the rainwater-waste separation effect, and reduce the deposition of pollutants. In addition, the anode grate adopts a polypyrrole material with high conductivity, good environmental stability and strong electron storage capacity. As a flexible material, it is wound with the cathode grate in multiple strands to form multiple short-distance anode and cathode electrolysis areas, which can effectively increase the electrochemical reaction efficiency under the condition of lack of electrolyte. At the same time, the polypyrrole material has strong corrosion resistance and can effectively slow down the corrosion of the cathode material.

[0041] (4) The rainwater-sewage separation system in the rainwater-sewage separation and purification device of the present invention has a rotating shaft made of rigid material, parallel to the ground, and a rotating door slightly lower than the ground. During normal traffic, the rotating shaft serves as a pressure surface to prevent the rotating door from being damaged by traffic and affecting normal traffic on urban roads. At the same time, the rotating door is tilted at an angle of 5° to the ground, which fully considers the degradation of small streams of rainwater or ground water when the rainfall intensity is low. The system uses the characteristics of the float changing with the water level and water pressure to drive the baffle to control the opening and closing of the sewage pipe inlet, automatically separating the initial rainwater from the middle and late rainwater, thereby replacing the traditional manual control or electric lifting device, greatly reducing the management and operation costs. At the same time, a sand settling step and infiltration bricks are set at the bottom of the well to achieve the sedimentation of residual pollutants, further purify the collected rainwater, and prevent the blockage of the initial rainwater outlet. In addition, the rainwater-sewage separation system manually adjusts the separation position of the sewage pipe and the rainwater collection pipe according to the rainstorm intensity in different regions, which is convenient for local conditions. Due to the large amount of rainfall in the middle and late stages, in order to discharge it in time and prevent rainwater from flowing back into the wellbore, anti-backflow valves are added to the rainwater outlet pipes in the middle and late stages to ensure the safety and reliability of drainage. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a front view of the rainwater-sewage separation and purification device of the present invention;

[0043] Figure 2 It is a left side view of the rainwater-sewage separation and purification device of the present invention;

[0044] Figure 3 is a top view of the rainwater-sewage separation and purification device of the present invention;

[0045] Figure 4 is a circuit diagram of the solar electrolytic cell system of the present invention;

[0046] Figure 5It is a structural schematic diagram of the grate net in the present invention.

[0047] in:

[0048] 1. Rotating shaft, 2. Revolving door, 3. Cathode grate, 4. Anode grate, 5. Float, 6. Baffle, 7. Limit plate, 8. Sand settling step, 9. Infiltration brick, 10. Anti-backflow valve, 11. Sewage pipe, 12. Rainwater collection pipe, 13. Wellbore, 14. Ground, 15. Photovoltaic panel, 16. Control sensor, 17. Battery. DETAILED DESCRIPTION

[0049] The present invention will be further described below in conjunction with the accompanying drawings:

[0050] In view of the fact that the existing rainwater-sewage separation and purification devices in the current municipal system have single functions, complicated separation and purification methods, and high operating costs, the present invention aims to design an automatic rainwater-sewage separation and purification device that purifies organic matter and nitrogen pollutants in rainwater through solar electrolysis, uses a revolving door to adaptively adjust the rainwater flow rate, and achieves efficient separation of initial rainwater from mid- and late-stage rainwater through the buoyancy of a ball valve, so as to perform auxiliary sewage treatment when the sewage treatment plant is working at full capacity.

[0051] like Figure 1 to Figure 3 The device shown is a rain-waste separation and purification device based on solar electrolysis and water pressure drive. The device includes: a solar electrolysis cell system and a rain-waste separation system.

[0052] like Figure 4As shown, the solar electrolytic cell system includes a photovoltaic panel 15, a control sensor 16, an energy storage module and a grate circuit module; the photovoltaic panel is connected to the energy storage module, and the energy storage module is connected to the grate circuit module through the control sensor 16. The photovoltaic panel is extended to the ground by a light pole. The control sensor and the battery assembly are assembled on the back of the photovoltaic panel 15. The energy storage module is a battery 17. In this embodiment, the photovoltaic panel 15, the control sensor 16 and the battery 17 are supported by a light pole, extending above the ground 14, the pole height is 3m, the cathode grate 3 and the anode grate 4 are located 0.10m-0.3m below the revolving door 2, and the diameter is 0.68m. The photovoltaic panel 15 is a single crystal 50W, 12V solar panel, size: 670mm×450mm, under sunlight, the photovoltaic panel produces a photoelectric effect, stimulates the flow of electrons, and outputs a DC voltage to the control sensor 16. Existing studies have shown that low-intensity external voltage (0.5-2V) can promote the removal of organic matter and nitrogen in sewage and wastewater, and the removal effect is best at 0.9V, with a COD removal rate of 95.300±2.25% and a total nitrogen removal rate of 94.93±2.00%. Therefore, a working voltage of 0.9V is used in this embodiment. In order to achieve continuous and stable voltage transmission, the solar electrolytic cell system needs to use a storage battery 17. On sunny days, the revolving door is closed, and after the equalization is completed, the storage battery outputs a 0.9V stable DC voltage to the anode and cathode grates through the control sensor until the working voltage drops to the maintenance voltage point of 0.5V, and the control sensor 16 disconnects the load external circuit and closes the energy storage circuit until the equalization is completed. The control sensor 16 closes the load external circuit and disconnects the energy storage circuit, and the above process is repeated. On rainy days, the revolving door is opened, and the control sensor 16 disconnects the load external circuit.

[0053] like Figure 1 to Figure 3 As shown, the rainwater-sewage separation system includes a shaft 13, a plurality of revolving doors 2 installed at the upper opening of the shaft 13, a rainwater collection pipe 12 arranged on the outer wall of the middle section of the shaft 13, and a sewage pipe 11 arranged on the outer wall of the lower end of the shaft 13; the grate circuit module is arranged in the shaft 13; a floating moving component is arranged in the shaft 13; the floating moving component includes a baffle 6 arranged corresponding to the inlet of the sewage pipe 11 and a float 5 for driving the baffle 6 to move under the action of buoyancy.

[0054] The above-mentioned rainwater-sewage separation and purification device is suitable for in-situ purification of rainwater during heavy rainfall seasons when sewage treatment plants are operating at full capacity. During the rainy season, surface rainwater runoff uses water pressure to flow into the wellbore through the revolving door, and the cathode and anode grates intercept the surface particles entrained in the rainwater. The float and baffle in the wellbore are regulated by water pressure to automatically separate the initial rainwater from the middle and late rainwater. On sunny days, the photovoltaic panels convert light energy into electrical energy and store it in the battery. The battery adjusts the power through the control sensor to output a stable working voltage to the cathode and anode grates for the degradation of organic matter and nitrogen. Compared with traditional rainwater collection systems, this device can purify and separate rainwater more quickly and efficiently, intercept and treat pollutants in situ through the grate circuit module, realize automatic separation of rainwater and sewage and clean rainwater recycling, take into account the low-impact development of urban roads, and is suitable for use as a supporting facility for sponge cities, and can be used as a resource-based facility to replace local rainwater systems. The present invention does not require large-scale sewage treatment equipment with complex structures in sewage treatment plants. It can purify and separate rainwater through simple structural design. When the sewage treatment plant is in a saturated working state, it can play a good auxiliary role and avoid causing greater pressure on the sewage treatment plant. It also ensures the normal operation of the sewage pipe network and protects the environment. The collected reclaimed water can be directly used for fire fighting, agricultural irrigation and urban greening, which greatly reduces the cost of rainwater treatment.

[0055] In some embodiments, the wellbore 13 is a buried cylindrical structure, and the sewage pipe 11 and the rainwater collection pipe 12 are arranged on the two side walls of the wellbore 13, wherein the sewage pipe is arranged at the bottom of the side wall of the wellbore 13, and the rainwater collection pipe 12 is arranged in the middle of the side wall of the wellbore 13. The rainwater collection pipe 12 is provided with an anti-backflow valve 10. The anti-backflow valve 10 is arranged in the rainwater collection pipe 12. The buried part of the wellbore 13 has a diameter of 0.8m, a height of 1.60m, and an effective volume of about 1m 3 The sewage pipe 11 is 0.15m away from the bottom of the side wall of the shaft 13, DN150mm. The rainwater collection pipe 12 is located in the middle of the side wall of the shaft 13, 0.8m away from the bottom, DN150mm, and is equipped with an anti-backflow valve 10. The sand settling step 9 is located at the bottom of the shaft 12, with a slope facing the water inlet of the sewage pipe, and the slope height is 0.10m.

[0056] In some embodiments, an infiltration brick 9 is provided at the bottom of the wellbore 13; the infiltration brick 9 is provided at the bottom of the wellbore 13. A sand settling step 8 is provided on the top of the infiltration brick 9. The sand settling step 8 and the infiltration brick 9 are provided at the bottom of the wellbore 13 to achieve the sedimentation of residual pollutants, further purify the collected rainwater, and prevent the blockage of the initial rainwater outlet. The sand settling step 8 is located at the bottom of the wellbore 13, and a gap is provided between the sand settling step 8 and the sewage pipe 11, and the gap is provided for the displacement of the spherical float 5 and the baffle 6, and the float 5 and the baffle 6 are connected by a connecting rod. The limit plate 7 is provided above the sewage pipe 11. The infiltration brick 9 is provided at the bottom of the wellbore 13.

[0057] In some embodiments, the revolving door includes a rotating shaft, a door body rotatably engaged with the rotating shaft, and a return spring connected between the door body and the rotating shaft. The revolving door is made of a lightweight flexible polymer material and is internally provided with a lightweight spring. It rotates around the rotating shaft and is arranged in a slightly inclined "fish scale" shape below the ground level. The angle between the door body and the ground is 5°. That is, there is still a gap between adjacent revolving doors in the natural closed state of the revolving door, which is convenient for the drainage of small amounts of rainwater and road surface water. The rotating shaft is made of a rigid material, and the rotating shafts of each revolving door are arranged in a "丰" shape parallel to the ground.

[0058] In some embodiments, the float 5 is connected to the baffle 6 through a connecting rod; one end of the connecting rod is connected to the float 5, and the other end is movably connected to the baffle 6; the baffle 6 is rotatably engaged with the inner wall of the wellbore 13. A limiting plate 7 is provided on the inner wall of the wellbore 13. There is an activity space between the sedimentation step 8 and the sewage pipe 11 for the displacement of the float 5 and the baffle 6, and the float 5 and the baffle 6 are connected by a central control connecting rod. The limiting plate 7 is arranged 0.05 m above the sewage pipe 11, and there is a groove for the hollow connecting rod to pass through in the middle. The limiting plate plays a limiting role to limit the upward movement position of the baffle.

[0059] In some embodiments, the grid circuit module includes an anode grid 4 and a cathode grid 3; as Figure 5 shown, the cathode grid 3 is spiral; the anode grid 4 includes three parts: a side electrode, a filamentous electrode, and a bottom electrode arranged in sequence. The side electrode is annular and placed in the vertical direction, the bottom electrode is planar, and the filamentous electrode extends upward from the bottom electrode. The cathode grid 3 is located in the space surrounded by the side electrodes, and the filamentous electrode is wound around the cathode grid 3; the cathode grid 3 is made of high-carbon steel material, and the anode grid 4 is made of polypyrrole material. The cathode grid 3 hangs vertically from the rotating shaft (the connection is insulated), the upper end is connected to the control sensor 16, and the lower end hangs in a spiral disk shape; the anode grid 4 is columnar, the side electrodes are arranged vertically, the bottom electrode is arranged horizontally, and a filamentous electrode extends upward from the center of the bottom, winding around the cathode. The cathode gradually fills the space encompassed by the side electrodes from top to bottom, and the filamentous electrode is wound around the cathode grid. Such a design can increase the specific surface area of the grid. Both the anode and the cathode are connected to the control sensor through an external circuit.

[0060] The separation and purification method of the above rainwater and sewage separation and purification device includes:

[0061] S1. Perform rainwater and sewage separation during rainfall

[0062] S11. When the rainfall is less than the first rainwater threshold, the revolving door 2 closes, and the rainwater flows into the wellbore 13 along the surface gap of the revolving door 2. The first rainwater threshold is 1.0 mm / h.

[0063] S12, when the amount of rainwater is greater than the first rainwater threshold, the revolving door 2 rotates open with the rotating shaft 1 as the axis, the control sensor 16 disconnects the grate circuit module, the rainwater flows into the shaft 13, and some solid matter carried in the rainwater is intercepted by the rotating shaft 1.

[0064] S13, after the rainwater flows into the wellbore 13, it passes through the grate circuit module, and the grate circuit module intercepts the surface particles in the rainwater.

[0065] S14, rainwater flows to the bottom of the well 13. Initially, the rainwater is directly discharged into the sewage network through the sewage pipe 11. When the water level in the well 13 rises to a certain height, the float 5 drives the baffle 6 to rotate as the water level rises. The baffle 6 seals the water inlet of the sewage pipe 11, and the rainwater in the well 13 is no longer discharged from the sewage pipe 11.

[0066] S15, the rainwater in the wellbore 13 continues to rise to the water inlet of the rainwater collecting pipe 12, enters the rainwater collecting pipe 12 and is sent to the city's clean rainwater storage system.

[0067] S16. When the amount of rainwater is less than the first rainwater threshold again, the revolving door 2 is closed, the water level in the shaft 13 drops, the float 5 drives the baffle to drop, the water inlet of the sewage pipe 11 is opened, part of the rainwater in the shaft 13 flows out from the sewage pipe 11, and the remaining rainwater seeps out through the infiltration bricks at the bottom of the shaft 13 or evaporates naturally.

[0068] S2. In-situ degradation of pollutants when there is no rainfall

[0069] S21, the revolving door 1 is in a closed state, the photovoltaic panel 15 is in a pass state, the photovoltaic panel 15 converts light energy into electrical energy and adjusts the power through the control sensor 16 to transmit it to the energy storage module for direct charging and energy storage. When the voltage of the energy storage module rises to the maintenance voltage, the control sensor 16 adjusts the power to enter the energy storage module equalization charging state.

[0070] S22. After equalization is completed, the control sensor 16 closes the grate circuit module and disconnects the energy storage circuit. The energy storage module outputs a stable voltage to the grate circuit module through the control sensor 16, and the grate circuit module electrolyzes the pollutants in the rainwater. The low-intensity external voltage (0.5-2V) can promote the removal of organic matter and nitrogen in sewage and wastewater, and the removal effect is best at 0.9V. The COD removal rate is 95.300±2.25%, and the total nitrogen removal rate is 94.93±2.00%.

[0071] S23, when the working voltage of the grate circuit module drops to the maintenance voltage point, the control sensor 16 disconnects the grate circuit module and closes the energy storage module until the equalization charging is completed, and the control sensor 16 closes the grate circuit module again and disconnects the energy storage module, and repeats the above-mentioned in-situ degradation process of pollutants.

[0072] The working principle of the present invention is:

[0073] During rainfall, when rainwater does not form runoff, the revolving door 2 closes naturally, and a small amount of rainwater flows into the wellbore from the gap along the surface of the revolving door 2 under the action of gravity; when rainwater forms runoff, the revolving door 2 rotates open with the rotating shaft 1 as the axis under the action of rainwater gravity and lateral water pressure, and flows evenly into the wellbore 13. The rotating shaft 1 can intercept block-shaped and sheet-shaped objects (such as stones and leaves) carried by rainwater runoff and flow into the wellbore 13. After the rainwater flows into the wellbore 13, it passes through the anode and cathode grates, and the grates intercept the surface particles. The rainwater flows into the bottom of the wellbore 13. The initial rainwater is directly discharged into the sewage network through the bottom sewage pipe. When the water level in the wellbore 13 rises to a certain height, the float 5 rises and drives the baffle 6 to rotate, and the water inlet of the sewage pipe 11 is closed under the action of lateral water pressure. The rainwater in the shaft 13 continues to rise to the water inlet of the rainwater collection pipe 12, and then enters the rainwater collection pipe 12 through the anti-backflow valve 10 and is sent to the city's clean rainwater storage system. As the rainfall intensity gradually decreases, the revolving door 2 automatically closes, the water level in the shaft 13 drops, the float 5 drives the baffle 6 to fall, the water inlet of the sewage pipe 11 opens, and the remaining rainwater flows out from the sewage pipe 11. The remaining rainwater seeps out through the infiltration bricks at the bottom of the shaft 13 or evaporates naturally.

[0074] On sunny days, the revolving door 2 is in a naturally closed state, and the photovoltaic panel 15 (photovoltaic panel) is in a pass state. The photovoltaic panel 15 converts light energy into electrical energy and adjusts the power through the control sensor 16 (control sensor) to stably transmit it to the battery 17 (energy storage module) for direct charging and energy storage. When the voltage of the battery 17 rises to the maintenance voltage, the control sensor 16 adjusts the power to enter the battery 17 equalization state. After the equalization is completed, the control sensor 16 closes the load external circuit and disconnects the energy storage circuit. The battery 17 outputs a stable voltage to the cathode and cathode grates (circuit modules) through the control sensor 16. The polypyrrole anode oxidizes organic matter and ammonia nitrogen, and the high-carbon steel cathode reduces nitrate nitrogen and nitrite nitrogen. When the working voltage of the grate drops to the maintenance voltage point, the control sensor 16 disconnects the load external circuit and closes the energy storage circuit until the equalization is completed. The control sensor 16 closes the load external circuit again and disconnects the energy storage circuit, and repeats the above-mentioned pollutant in-situ degradation process. When the rainfall intensity is large and the rainwater forms runoff, the water pressure pushes the revolving door 2 to open, and the control sensor 16 automatically disconnects the load external circuit. At this time, the device performs the rain and sewage separation process.

[0075] In summary, the present invention can efficiently degrade organic pollutants and nitrogen pollutants in initial rainwater in situ, realize the automated separation of initial polluted rainwater and mid- and late-stage rainwater, collect and clean it, and improve the efficiency of rainwater resource utilization, thus facilitating the construction of sponge cities.

[0076] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the scope of protection determined by the claims of the present invention.

Claims

1. A rainwater-sewage separation and purification device based on solar electrolysis and water pressure drive, characterized in that: The device comprises: a solar electrolytic cell system and a rainwater-sewage separation system; the solar electrolytic cell system comprises a photovoltaic panel, a control sensor, an energy storage module and a grate circuit module; the photovoltaic panel is connected to the energy storage module, and the energy storage module is connected to the grate circuit module through the control sensor; the rainwater-sewage separation system comprises a wellbore, a plurality of revolving doors installed at the opening of the upper end of the wellbore, a rainwater collection pipe arranged on the outer wall of the middle section of the wellbore, and a sewage pipe arranged on the outer wall of the lower end of the wellbore; the grate circuit module is arranged in the wellbore; a floating moving component is arranged in the wellbore; the floating moving component comprises a baffle arranged corresponding to the inlet of the sewage pipe and a float used for driving the baffle to move under the action of buoyancy; The grate circuit module includes an anode grate and a cathode grate; the anode grate and the cathode grate are both connected to the control sensor through an external circuit; the cathode grate is spiral; the anode grate includes three parts, namely, a side electrode, a filament electrode and a bottom electrode, which are arranged in sequence. The side electrode is annular and placed in a vertical direction, the bottom electrode is flat, the filament electrode is extended upward from the bottom electrode, the cathode grate is located in the space surrounded by the side electrodes, and the filament electrode is wound around the cathode grate; the cathode grate is made of high carbon steel, and the anode grate is made of polypyrrole material; the grate circuit module is used to intercept pollutants in rainwater when the power is off, and is used to electrolyze pollutants when the power is on; The revolving door comprises a rotating shaft, a door body rotatably matched with the rotating shaft, and a return spring connected between the door body and the rotating shaft.

2. The rainwater-sewage separation and purification device according to claim 1, characterized in that: Infiltration bricks are arranged at the bottom of the wellbore; and sand settling steps are arranged on the top of the infiltration bricks.

3. The rainwater-sewage separation and purification device according to claim 1, characterized in that: The control sensor is used to monitor the working voltage state and the opening and closing state of the revolving door; the energy storage module is a battery.

4. The rainwater-sewage separation and purification device according to claim 1, characterized in that: The wellbore is a buried cylindrical structure.

5. The rainwater-sewage separation and purification device according to claim 1, characterized in that: The rainwater collection pipe is provided with an anti-backflow valve.

6. The rainwater-sewage separation and purification device according to claim 1, characterized in that: The float is connected to the baffle through a connecting rod; one end of the connecting rod is connected to the float, and the other end is movably connected to the baffle; the baffle is rotatably matched with the inner wall of the wellbore.

7. The rainwater-sewage separation and purification device according to claim 1, characterized in that: A limiting plate is arranged on the inner wall of the wellbore.

8. The separation and purification method of the rainwater-sewage separation and purification device according to any one of claims 1 to 7, characterized in that: The method includes: S1. Separate rainwater and sewage during rainfall S11, when the amount of rainwater is less than the first rainwater threshold, the revolving door is closed, and the rainwater flows into the wellbore along the gap on the surface of the revolving door; S12, when the amount of rainwater is greater than the first rainwater threshold, the revolving door rotates open with the rotating shaft as the axis, the control sensor disconnects the grate circuit module, the rainwater flows into the wellbore, and some solid matter carried by the rainwater is intercepted by the rotating shaft; S13, after the rainwater flows into the wellbore, it passes through the grate circuit module, and the grate circuit module intercepts the surface particles in the rainwater; S14, rainwater flows to the bottom of the wellbore. Initially, rainwater is directly discharged into the sewage network through the sewage pipe. When the water level in the wellbore rises to a certain height, the float drives the baffle to rotate as the water level rises. The baffle seals the water inlet of the sewage pipe, and the rainwater in the wellbore is no longer discharged from the sewage pipe. S15, the rainwater in the wellbore continues to rise to the water inlet of the rainwater collection pipe, enters the rainwater collection pipe and is sent to the city's clean rainwater storage system; S16. When the amount of rainwater is less than the first rainwater threshold again, the revolving door is closed, the water level in the wellbore drops, the float drives the baffle to drop, the water inlet of the sewage pipe is opened, part of the rainwater in the wellbore flows out from the sewage pipe, and the remaining rainwater seeps out through the infiltration bricks at the bottom of the wellbore or evaporates naturally; S2. In-situ degradation of pollutants when there is no rainfall S21, the revolving door is in a closed state, the photovoltaic panel is in a pass state, the photovoltaic panel converts light energy into electrical energy and transmits it to the energy storage module through the control sensor to adjust the power for direct charging and energy storage. When the voltage of the energy storage module rises to the maintenance voltage, the control sensor adjusts the power to enter the energy storage module equalization charging state; S22, after equalization is completed, the control sensor closes the grate circuit module and disconnects the energy storage circuit. The energy storage module outputs a stable voltage to the grate circuit module through the control sensor, and the grate circuit module electrolyzes the pollutants in the rainwater; S23, when the working voltage of the grate circuit module drops to the maintenance voltage point, the control sensor disconnects the grate circuit module and closes the energy storage module until the equalization charging is completed, and the control sensor closes the grate circuit module again and disconnects the energy storage module, and repeats the above-mentioned in-situ degradation process of pollutants.

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