Initial rainwater purification system and method

Abstract

The present invention belongs to the technical field of rainwater purification devices, and particularly relates to an initial rainwater purification system and method. Its technical solution is as follows: an initial rainwater purification system comprises several assembled filter devices arranged in a slope protection area, wherein the upper layer of the filter devices comprises a filter unit, an impurity collection unit is arranged below the filter unit, and the impurity collection unit is connected to an impurity discharge unit. A drain outlet is provided between the filter unit and the impurity collection unit along the lower side of the slope protection. The system also comprises a bank permeable plate, several layers of rainwater purification devices, and an aeration outlet device, which are arranged sequentially from top to bottom on the bank. The rainwater purification device is provided with an electrocatalytic unit and an ultraviolet lamp assembly, and the aeration outlet device is provided with an outlet for discharging purified water into a water area. The present invention provides an initial rainwater purification system and method that effectively removes impurities and degrades TP, TN, and difficult-to-degrade organic matter.

Description

Technical Field

[0001] The present invention belongs to the technical field of rainwater purification devices, and in particular relates to an initial rainwater purification system and method. Background Art

[0002] Initial rainwater refers to the surface runoff reaching a thickness of 10 to 15 mm during the initial stages of rainfall. Because initial rainwater dissolves large amounts of pollutants such as acidic gases, vehicle exhaust, and factory emissions from the air, initial rainwater is relatively polluted. When this rainwater reaches the ground and washes over surfaces like roofs and asphalt concrete roads, it carries a significant amount of pollutants. These pollutants, including heavy metals, organic matter, and bacteria, pose potential threats to both the environment and human health. Therefore, the treatment and management of initial rainwater is crucial.

[0003] If this polluted primary rainwater is discharged directly into rivers or other water bodies, it will seriously pollute aquatic ecosystems, affecting water quality and the health of aquatic life. Furthermore, pollutants in primary rainwater may seep into water sources through groundwater, further affecting the quality of drinking water. Therefore, the treatment and management of primary rainwater is an important component of environmental protection and water resources management.

[0004] Artificial water bodies, such as lakes, have relatively fragile endogenous homeostasis and limited capacity to absorb exogenous pollutants. To reduce the level of primary stormwater pollution, a range of measures are necessary. For example, rainwater collection ponds and green belts can be installed to reduce runoff into lakes and prevent soil erosion. Green infrastructure such as bioretention ponds and rain gardens can be implemented to reduce pollutant inputs. Furthermore, measures such as improving the permeability of roofing and road materials and installing specialized stormwater drainage systems can reduce primary stormwater runoff and pollutant emissions. However, these measures also have drawbacks. For example, installing rainwater collection ponds and green belts can be costly and require significant land area. Bioretention ponds and rain gardens require maintenance, otherwise they may become breeding grounds for mosquitoes. Improving the permeability of roofing and road materials may reduce their durability, requiring more frequent maintenance and replacement. Furthermore, these measures rely heavily on permeable materials and their subsequent maintenance, effectively trapping pollutants but failing to purify primary stormwater in situ.

[0005] In summary, the pollution level of primary rainwater is high, posing a potential threat to both the environment and human health. Therefore, the treatment and management of primary rainwater need to be given due attention, and effective measures should be taken to reduce its pollution level and ensure the safety and sustainable use of water resources.

[0006] Currently, conventional initial rainwater purification methods have the following problems:

[0007] First, it occupies a large area and has high maintenance costs.

[0008] Second, it does not have the ability to purify and improve water quality in situ, and its ability to remove SS and homogeneous particle-sized pollutants is weak.

[0009] Third, it does not have the ability to remove TP, TN and difficult-to-degrade organic matter in water.

[0010] Fourth, it is impossible to monitor the water quality of each step outlet section in real time.

[0011] At this stage, there is an urgent need for a coupling technology that can purify initial rainwater. Summary of the Invention

[0012] In order to solve the above problems existing in the prior art, the object of the present invention is to provide an initial rainwater purification system and method that can effectively remove impurities and degrade TP, TN, and difficult-to-degrade organic matter.

[0013] The technical solution adopted in the present invention is:

[0014] An initial rainwater purification system includes several assembled filtering devices arranged in a slope protection area, wherein the upper layer of the filtering device is a filtering unit, an impurity collection unit is arranged on the lower side of the filtering unit, the impurity collection unit is connected to an impurity discharge unit, and a drainage outlet is arranged on the lower side along the slope protection direction between the filtering unit and the impurity collection unit; the system also includes a shore permeable plate located on the shore and arranged in sequence from top to bottom, several layers of rainwater purification devices and an aeration outlet device, wherein an electrocatalytic unit and an ultraviolet lamp group are arranged in the rainwater purification device, and the aeration outlet device is provided with an outlet for discharging purified water into a water area.

[0015] Initial rainwater enters the various filtration devices in the slope protection area. The filtration units filter relatively large impurities, and the filtered rainwater enters the impurity collection unit. The filtered rainwater also contains fine impurities, which precipitate on the impurity collection unit. The impurity collection unit then transports the precipitated fine impurities to the impurity discharge unit, which then discharges the impurities. Therefore, the present invention provides in-situ purification and water quality improvement capabilities, effectively removing SS and homogeneous particle-sized pollutants.

[0016] Rainwater that has passed through the filtration system flows onto the permeable slabs on the bank, then passes through several layers of rainwater purification equipment and aeration outlets before being discharged into the waterway. The rainwater purification equipment uses electrocatalytic treatment and UV irradiation to remove TP, TN, and recalcitrant organic matter from the initial rainwater. The aeration outlet aerates the rainwater before discharging it into the waterway. This invention incorporates advanced oxidation technology based on deep space ultraviolet light to remove recalcitrant organic matter in the incoming water in situ, and utilizes the increased DO concentration caused by the water drop to further improve degradation efficiency.

[0017] The present invention arranges several filtering devices in the slope protection area and splices them together, and arranges shore permeable boards, several layers of rainwater purification devices and aeration water outlet devices in sequence from top to bottom on the shore, introducing the concept of assembly. Each device can be spliced and replaced to achieve efficient operation of the equipment.

[0018] As a preferred embodiment of the present invention, the filtration unit includes a permeable support plate. The drain outlet is located on the lower side of the permeable support plate along the slope protection between the permeable support plate and the impurity collection unit. The permeable support plate is provided with a plurality of filter media blocks, each filled with filter media. The filter media filters impurities from the initial rainwater, and the filtered rainwater flows through the permeable support plate to the impurity collection unit. Gaps are provided between the filter media blocks to prevent impurities from clogging the filtration unit. Furthermore, the filter media blocks can be replaced after a period of use to ensure optimal filtration.

[0019] As a preferred embodiment of the present invention, the filter media packing block is sequentially arranged with several internal support rings from top to bottom. These internal support rings divide the internal space of the filter media packing block into several filter media packing layers. The filter media particle size decreases from top to bottom in the filter media packing layers. The filter media packing block has a coarse filter media in the upper layer, a medium-coarse filter media in the middle layer, and a fine filter media in the lower layer. This allows impurities of different particle sizes to be fully filtered, improving the filtration effect on rainwater.

[0020] As a preferred embodiment of the present invention, the impurity collection unit includes a base plate, on which are installed several transverse collecting spirals, and a transverse impurity collection trough is provided on the side of the transverse collecting spiral close to the shore permeable plate, and the impurity collection trough is fixed on the base plate; a longitudinal collecting spiral is also installed on the base plate, and a longitudinal impurity collection trough is fixed on the base plate, and the longitudinal collecting spiral is arranged close to the longitudinal impurity collection trough, and the outlet ends of several transverse collecting spirals are connected to the longitudinal impurity collection trough, and the output end of the longitudinal collecting spiral is connected to the impurity discharge unit, and the drain outlet is arranged on the lower side along the slope protection direction between the base plate and the filter unit.

[0021] Because the filter device is positioned obliquely within the slope protection area, impurities in the rainwater on the baseplate settle as it flows toward the bank's permeable panels and are collected by the various horizontal impurity collection troughs. The horizontal collection spirals transport impurities from the horizontal troughs to the vertical impurity collection troughs, where they are then transported by the vertical collection spirals to the impurity discharge unit. This ensures that impurities deposited in the impurity collection unit are smoothly transported to the discharge unit, preventing silt accumulation on the baseplate.

[0022] As a preferred embodiment of the present invention, the impurity discharge unit includes an impurity discharge trough connected to the output end of the impurity collection unit, a scraper conveyor belt installed in the impurity discharge trough, and an impurity lifting conveyor belt installed on one side of the impurity discharge trough located at the outlet end of the scraper conveyor belt. The scraper conveyor belt scrapes impurities in the impurity discharge trough toward the impurity lifting conveyor belt, which then discharges the impurities.

[0023] As a preferred embodiment of the present invention, the rainwater purification device further includes a purification support tank, and the electrocatalytic unit comprises a retractable anode plate, a retractable insulating and permeable plate, and a retractable cathode plate, connected sequentially within the purification support tank from top to bottom. The retractable anode plate and the retractable cathode plate are energized to perform electrocatalytic treatment on the rainwater. The retractable anode plate, the retractable insulating and permeable plate, and the retractable cathode plate are all retractable. When the incoming water quality is poor, the retractable anode plate, the retractable insulating and permeable plate, and the retractable cathode plate extend to increase the electrocatalytic reaction area; otherwise, they retract.

[0024] As a preferred embodiment of the present invention, several rainwater purification devices are rotated 90 degrees relative to the upper rainwater purification device in the same direction from top to bottom. As rainwater passes through each rainwater purification device, it falls on the electrocatalytic units in different directions. The resulting increase in DO concentration improves degradation efficiency.

[0025] As a preferred embodiment of the present invention, the aerated water outlet device includes a water outlet support trough, within which a water outlet plate is rotatably connected. A lifting mechanism is provided between the other end of the water outlet plate and the water outlet support trough. An aeration pipeline is mounted on the water outlet plate, and the water outlet is located on the side of the water outlet support trough near the lower end of the water outlet plate. The lifting mechanism can raise and lower one end of the water outlet plate, thereby adjusting the inclination angle of the water outlet plate. The inclination angle of the water outlet plate is adjusted according to the inlet water flow rate. The inclination angle of the water outlet plate increases when the flow rate is high, and decreases when the flow rate is low.

[0026] As a preferred embodiment of the present invention, it also includes a control device. An online water quality detector is installed in the rainwater purification device. The online water quality detector has built-in conductivity online detection probe, temperature online detection probe, chromaticity online detection probe, pH value online detection probe, and dissolved oxygen online detection probe. A real-time water depth detection probe is installed in the aeration water outlet device. The online water quality detector, real-time water depth detection probe, lifting mechanism, aeration water outlet device, electrocatalytic unit and ultraviolet lamp group are electrically connected to the control device respectively.

[0027] The real-time water depth detection probe detects the water depth of the aeration outlet device and determines the initial rainwater inlet flow rate based on the water depth of the aeration outlet device; if the flow rate is large, the control device controls the lifting mechanism to increase the inclination angle of the outlet plate; if the flow rate is small, the control device controls the lifting mechanism to lower the inclination angle of the outlet plate.

[0028] An online water quality monitor performs online water quality checks on each rainwater purification device, measuring conductivity, temperature, color, pH, and dissolved oxygen. The quality of the rainwater is assessed based on the corresponding end-face water quality standards for each rainwater purification device. If the water quality is poor, the control device increases the aeration volume, the voltage of the electrocatalytic unit, and the power of the UV lamp assembly. If the water quality is good, the control device decreases the aeration volume, the voltage of the electrocatalytic unit, and the power of the UV lamp assembly.

[0029] A method for purifying initial rainwater comprises the following steps:

[0030] The filtration unit filters the initial rainwater, and the filtered rainwater precipitates fine impurities on the impurity collection unit. The rainwater is then discharged to the bank permeable board, and the fine impurities are discharged through the impurity collection unit and the impurity discharge unit;

[0031] Rainwater passes through the permeable panels on the shore and enters several layers of rainwater purification devices in sequence for electrocatalytic treatment and UV light irradiation; the rainwater then enters the aeration outlet device for aeration treatment, and after aeration, the rainwater is discharged into the water area;

[0032] Real-time detection of the water depth of the aeration outlet device, based on which the initial rainwater inflow rate is determined; if the flow rate is large, the inclination angle of the outlet plate is increased; if the flow rate is small, the inclination angle of the outlet plate is decreased;

[0033] The rainwater in each rainwater purification device is tested online for water quality, including conductivity, temperature, color, pH, and dissolved oxygen. The quality of the rainwater is determined based on the corresponding end-face water quality standards for each rainwater purification device. If the water quality is poor, the aeration volume, electrocatalytic unit voltage, and UV lamp power are increased. If the water quality is good, the aeration volume, electrocatalytic unit voltage, and UV lamp power are reduced.

[0034] After the initial rainwater collection is completed, turn off the electrocatalytic unit and UV lamp group and continue aeration.

[0035] The present invention can detect the water depth of the aeration outlet device in real time, determine the initial rainwater inflow rate based on the water depth, and control the inclination angle of the outlet plate based on the inflow rate. The present invention performs online water quality testing on each rainwater purification device and adjusts the aeration volume, electrocatalytic unit voltage, and UV lamp power accordingly, achieving accurate control of the initial rainwater purification process.

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

[0037] 1. The filtration unit of the present invention filters relatively large impurities, while fine impurities are deposited on the impurity collection unit. The impurity collection unit then transports the deposited fine impurities to the impurity discharge unit, which then discharges the impurities. This invention provides in-situ purification and water quality improvement capabilities, effectively removing SS and contaminants of uniform particle size.

[0038] 2. Rainwater from the filtration system flows onto the permeable slabs on the bank, then passes through several layers of rainwater purification equipment and aeration outlets before being discharged into the waterway. The rainwater purification equipment electrocatalytically treats the rainwater and irradiates it with UV light to remove TP, TN, and recalcitrant organic matter from the initial rainwater. The aeration outlet aerates the rainwater before discharging it into the waterway. This invention incorporates advanced oxidation technology based on deep space ultraviolet light to remove recalcitrant organic matter in the incoming water in situ, and utilizes the increased DO concentration caused by the water drop to further improve degradation efficiency.

[0039] 3. The present invention installs and splices several filtration devices in the slope protection area, and installs shore permeable panels, several layers of rainwater purification devices and aeration water outlet devices in sequence from top to bottom on the shore, introducing the concept of assembly. Each device can be spliced and replaced to achieve efficient operation of the equipment.

[0040] 4. This invention can detect the water depth of the aeration outlet in real time, determine the initial rainwater inflow rate based on the water depth, and control the inclination angle of the outlet plate based on the inflow rate. This invention performs online water quality testing on each rainwater purification device and adjusts the aeration volume, electrocatalytic unit voltage, and UV lamp power accordingly, achieving precise control of the initial rainwater purification process. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of the present invention;

[0042] Figure 2 It is a structural diagram of the filtering device;

[0043] Figure 3 It is an exploded view of the filtration device;

[0044] Figure 4 It is a structural diagram of the filter material filling block;

[0045] Figure 5 It is a structural diagram of the filtration unit;

[0046] Figure 6 It is a structural schematic diagram of the impurity collection unit and the impurity discharge unit;

[0047] Figure 7 yes Figure 6 A partial enlarged view of point A in the middle;

[0048] Figure 8 It is a structural schematic diagram of the impurity discharge unit when the protection box is removed;

[0049] Figure 9 It is an exploded diagram of the impurity discharge unit;

[0050] Figure 10 It is an exploded view of the processing unit;

[0051] Figure 11 It is a structural diagram of the bank permeable board and the bank railing;

[0052] Figure 12 It is a structural diagram of the first direction of the rainwater purification device;

[0053] Figure 13 It is a structural diagram of the second direction of the rainwater purification device;

[0054] Figure 14 It is a structural diagram of the aeration water outlet device;

[0055] Figure 15 It is a flow chart of a method for detecting and regulating water quality and water flow.

[0056] In the figure: 1-filtration device; 2-shore permeable plate; 3-rainwater purification device; 4-aeration outlet device; 5-shore railing; 11-filtration unit; 12-impurity collection unit; 13-impurity discharge unit; 31-electrocatalytic unit; 32-ultraviolet lamp assembly; 33-purification support tank; 34-online water quality detector; 41-outlet support tank; 42-outlet plate; 43-lifting mechanism; 44-real-time water depth detection probe; 45-aeration pipeline; 111-permeable support plate; 112-filter material filling block; 113-limiting frame; 121-bottom Plate; 122-horizontal collecting spiral; 123-horizontal impurity collecting trough; 124-longitudinal collecting spiral; 125-longitudinal impurity collecting trough; 131-impurity discharge trough; 132-scraping conveyor belt; 133-impurity lifting conveyor belt; 134-protection box; 311-telescopic anode plate; 312-telescopic insulating permeable plate; 313-telescopic cathode plate; 321-slot; 421-water outlet; 1111-drain outlet; 1121-internal support ring; 1211-assembled slot; 1212-assembled plug-in; 1341-impurity discharge outlet. DETAILED DESCRIPTION

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0058] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features therein may be combined with each other unless there is a conflict.

[0059] like Figures 1 to 3 、 Figures 10 to 14 As shown, the initial rainwater purification system of this embodiment includes several assembled filter devices 1 installed in the slope protection area. The upper layer of the filter device 1 is a filter unit 11. The impurity collection unit 12 is installed below the filter unit 11. The impurity collection unit 12 is connected to the impurity discharge unit 13. A drain outlet 1111 is provided below the filter unit 11 and the impurity collection unit 12 along the slope protection. The system also includes a bank permeable board 2, several layers of rainwater purification devices 3, and an aeration outlet device 4, which are arranged sequentially from top to bottom on the bank. The bank permeable board 2 is installed on the side close to the water area with a bank railing 5. The rainwater purification device 3 is equipped with an electrocatalytic unit 31 and an ultraviolet lamp assembly 32. The aeration outlet device 4 is provided with an outlet 421 for discharging purified water into the water area. The bank permeable board 2, the several layers of rainwater purification devices 3, and the aeration outlet device 4 constitute the initial rainwater treatment device.

[0060] Along the slope protection direction, the lowest filter device 1 is set close to the bank permeable plate 2, and the drain port 1111 is located on the upper side of the bank permeable plate 2. The filter device 1 is at a certain angle to facilitate the flow of filtered water from the filter device 1 to the treatment device and intercept impurities.

[0061] Initial rainwater enters the various filter devices 1 in the slope protection area. Filter units 11 filter relatively large impurities, and the filtered rainwater enters impurity collection units 12. The rainwater filtered by filter units 11 also contains fine impurities, which precipitate on impurity collection units 12. Impurity collection units 12 transport the precipitated fine impurities to impurity discharge units 13, which then discharge the impurities. Therefore, the present invention provides in-situ purification and water quality improvement capabilities, effectively removing SS and homogeneous particle-sized pollutants.

[0062] Rainwater passing through filtration device 1 flows onto the bank's permeable plate 2, then passes through several layers of rainwater purification devices 3 and aeration outlet devices 4 before being discharged into the waterway. Rainwater purification device 3 electrocatalytically treats the rainwater and irradiates it with ultraviolet light, removing TP, TN, and recalcitrant organic matter from the initial rainwater. Aeration outlet devices 4 aerate the rainwater before discharging it into the waterway. This invention incorporates advanced oxidation technology based on deep-space ultraviolet radiation to remove recalcitrant organic matter in the incoming water in situ, and utilizes the increased DO concentration caused by the water drop to further improve degradation efficiency.

[0063] The present invention arranges several filtering devices 1 in the slope protection area and splices them together, and arranges shore permeable boards 2, several layers of rainwater purification devices 3 and aeration water outlet devices 4 in sequence from top to bottom on the shore, introducing the concept of assembly. Each device can be spliced and replaced to achieve efficient operation of the equipment.

[0064] Specifically, if Figures 2 to 5 As shown, the filter unit 11 includes a permeable support plate 111. A drain outlet 1111 is provided on the lower side of the permeable support plate 111 and the impurity collection unit 12 along the slope protection direction. Several filter material filling blocks 112 are provided on the permeable support plate 111, and the filter material filling blocks 112 are filled with filter material. The filter material filters impurities in the initial rainwater. The filtered rainwater flows through the permeable support plate 111 to the impurity collection unit 12. There are gaps between the filter material filling blocks 112, so impurities will not clog the filter unit 11. In addition, the filter material filling blocks 112 can be replaced after a period of use to ensure that they have a good filtering effect.

[0065] A limiting frame 113 is provided on the permeable support plate 111 to ensure that the filter material filling blocks 112 are tightly arranged. The filter material filling blocks 112 can be arranged in two layers, and their height is determined according to the local initial rainwater quality and filter material. Under good water quality conditions, the height of the filter material filling blocks 112 can be reduced to less than or equal to 20 mm. Under poor water quality conditions, the height of the filter material filling blocks 112 should be increased to greater than 20 mm. The internal filter material of the filter material filling blocks 112 can be configured as at least one or a combination of nutshell filter material, quartz sand filter material, anthracite filter material, magnetite filter material, support layer filter material, foam filter bead filter material, sponge iron filter material, rare earth magnetic sand filter material, corundum filter material, ceramsite filter material, shale filter material, volcanic rock filter material, manganese sand filter material, medical stone filter material, coke filter material, zeolite filter material, garnet filter material, activated alumina balls, activated carbon, and other improved filter materials. The particle size is selected based on the size of the filter material filling blocks 112 and the influent water quality. The permeable support plate 111 is made of high-strength permeable material and meets the compressive strength load specification requirements.

[0066] Furthermore, a number of internal support rings 1121 are arranged in sequence from top to bottom in the filter material filling block 112. The internal support rings 1121 divide the internal space of the filter material filling block 112 into a number of filter material filling layers, and the particle size of the filter material in the filter material filling layers decreases from top to bottom. Under preferred conditions, a filter material filling block 112 with a height of 5 to 10 mm has one internal support ring 1121 built in; a filter material filling block 112 with a height of 10 to 20 mm has two internal support rings 1121 built in; for a filter material filling block 112 with a height of 20 mm and above, the number of internal support rings 1121 is determined according to the empirical formula: 2+(actual height-20) / 5. The filter material filling block 112 is divided from top to bottom into 2 / 5 of the total height, 2 / 5 of the total height, and 1 / 5 of the total height. Coarse filter material is set in the upper layer, medium-coarse filter material is set in the middle layer, and fine filter material is set in the lower layer, so that impurities of different particle sizes are fully filtered, thereby improving the filtering effect on rainwater. Figure 4 As shown, the shape of the filter material filling block 112 is generally a regular hexagon from the perspective of dense paving and stability. The shape can also be changed according to the situation, such as a regular pentagon, a regular quadrilateral, a regular triangle, a regular heptagon, etc.

[0067] Specifically, if Figure 6 and Figure 7 As shown, the impurity collecting unit 12 includes a base plate 121, on which are installed several transverse collecting spirals 122, and a transverse impurity collecting groove 123 is provided on the side of the transverse collecting spiral 122 close to the shore permeable plate 2, and the impurity collecting groove is fixed on the base plate 121; a longitudinal collecting spiral 124 is also installed on the base plate 121, and a longitudinal impurity collecting groove 125 is fixed on the base plate 121, and the longitudinal collecting spiral 124 is arranged close to the longitudinal impurity collecting groove 125, and the outlet ends of several transverse collecting spirals 122 are connected to the longitudinal impurity collecting groove 125, and the output end of the longitudinal collecting spiral 124 is connected to the impurity discharge unit 13, and the drain outlet 1111 is arranged on the lower side along the slope protection direction between the base plate 121 and the filter unit 11.

[0068] The transverse collection screw 122 and the longitudinal collection screw 124 are each driven by a high-torque motor. Both the transverse impurity collection trough 123 and the longitudinal impurity collection trough 125 are arc-shaped troughs open on one side. The longitudinal impurity collection trough 125 is tubular in section near the impurity discharge unit 13 to ensure smooth impurity transport into the impurity discharge unit 13. The output end of the longitudinal collection screw 124 is connected to the impurity discharge unit 13 via a pipe.

[0069] Because filtration device 1 is tilted and positioned in the slope protection area, impurities in rainwater on bottom plate 121 settle on bottom plate 121 as it flows toward the bank's permeable plate 2 and are collected by the various transverse impurity collection troughs 123. Transverse collection screws 122 transport impurities from transverse impurity collection troughs 123 to longitudinal impurity collection troughs 125. Impurities in longitudinal impurity collection troughs 125 are then transported by longitudinal collection screws 124 to impurity discharge unit 13. This ensures that impurities deposited in impurity collection unit 12 are smoothly transported to impurity discharge unit 13, preventing silt accumulation on bottom plate 121.

[0070] In order to facilitate assembly, Figure 3 As shown, one side of the base plate 121 is provided with an assembly slot 1211, and the other side of the base plate 121 is provided with an assembly plug-in 1212. The assembly slots 1211 of adjacent base plates 121 are plugged into the assembly plug-in 1212. The left and right sides of adjacent filter devices 1 are plugged into the assembly slots 1211 and the assembly plug-in 1212. The filter device 1 on the upper side is tightly arranged with the filter device 1 on the lower side by gravity, so that the slope protection area can be fully covered with filter devices 1.

[0071] Specifically, if Figure 8 and Figure 9 As shown, the impurity discharge unit 13 includes an impurity discharge trough 131, which is connected to the output end of the impurity collection unit 12. A scraping conveyor belt 132 is installed in the impurity discharge trough 131. An impurity lifting conveyor belt 133 is installed on one side of the impurity discharge trough 131 located at the outlet end of the scraping conveyor belt 132. The scraping conveyor belt 132 scrapes impurities in the impurity discharge trough 131 toward the impurity lifting conveyor belt 133, and the impurity lifting conveyor belt 133 discharges the impurities.

[0072] A removable protective box 134 is also installed on the impurity discharge trough 131, which is equipped with an impurity discharge port 1341. Impurity discharge port 1341 is normally closed and opens when mud is needed. The impurity discharge unit 13 is installed next to the permeable support plate 111. The protective box 134 can be filled with light sand or other materials for easy maintenance.

[0073] The scraper conveyor 132 is installed in the impurity discharge trough 131. Several scraper blades are installed on the scraper conveyor 132. The scraper blades on the underside of the scraper conveyor 132 scrape impurities from the impurity discharge trough. The two rotating shafts of the scraper conveyor 132 are connected to the impurity discharge trough 131 via bearings, one of which is driven by a motor. A lifting bracket is slidably connected to the impurity discharge trough 131, and a conveyor belt lifting device is connected between the lifting bracket and the impurity discharge trough 131. The conveyor belt lifting device can be a pneumatic cylinder. The two rotating shafts of the impurity lifting conveyor 133 are connected to the lifting bracket via bearings, one of which is driven by a motor. When the impurity discharge is not required, the lifting bracket can be lowered to facilitate the complete closure of the impurity discharge port 1341 on the protective box 134.

[0074] like Figure 10 、 Figure 12 and Figure 13 As shown, the rainwater purification device 3 also includes a purification support tank 33. The electrocatalytic unit 31 includes a retractable anode plate 311, a retractable insulating and permeable plate 312, and a retractable cathode plate 313, which are connected to the purification support tank 33 from top to bottom. The retractable anode plate 311 and the retractable cathode plate 313 are energized to perform electrocatalytic treatment on the rainwater. The retractable anode plate 311, the retractable insulating and permeable plate 312, and the retractable cathode plate 313 are all retractable. When the incoming water quality is poor, the retractable anode plate 311, the retractable insulating and permeable plate 312, and the retractable cathode plate 313 extend to increase the electrocatalytic reaction area; otherwise, they retract.

[0075] The retractable anode plate 311, retractable insulating and permeable plate 312, and retractable cathode plate 313 are all slidably connected within the purification support tank 33, allowing the coverage area of the retractable anode plate 311, retractable insulating and permeable plate 312, and retractable cathode plate 313 to be adjustable. The retractable cathode plate 313 is made of carbon-based materials, metal materials, etc., and operates on a DC voltage. The retractable anode plate 311 is made of metal oxides, etc., and operates on a DC voltage. The retractable anode plate 311, retractable insulating and permeable plate 312, and retractable cathode plate 313 operate synchronously, extending when the incoming water quality is poor to increase the electrocatalytic reaction area; otherwise, they retract.

[0076] A slot 321 is provided in the purification support tank 33 , and the ultraviolet lamp assembly 32 is connected to the slot 321 . The ultraviolet lamp assembly 32 and the electrocatalytic unit 31 are located on opposite sides of the purification support tank 33 .

[0077] Furthermore, several rainwater purification devices 3 are rotated 90 degrees relative to the upper rainwater purification device 3 in the same direction from top to bottom. As rainwater passes through each rainwater purification device 3 in sequence, it falls on the electrocatalytic units 31 in different directions. The increase in DO concentration caused by the falling water improves degradation efficiency.

[0078] Specifically, if Figure 14As shown, the aerated water outlet device 4 includes a water outlet support groove 41, in which a water outlet plate 42 is rotatably connected. A lifting mechanism 43 is provided between the other end of the water outlet plate 42 and the water outlet support groove 41. The lifting mechanism 43 can be a hydraulic cylinder. An aeration pipeline 45 is installed on the water outlet plate 42, and the water outlet 421 is provided on the side of the water outlet support groove 41 near the lower end of the water outlet plate 42. The lifting mechanism 43 can raise and lower one end of the water outlet plate 42, so that the inclination angle of the water outlet plate 42 can be adjusted. The inclination angle of the water outlet plate 42 can be set to 10° to 30°, and the inclination angle of the water outlet plate 42 is adjusted according to the water inlet flow rate. When the flow rate is large, the inclination angle of the water outlet plate 42 increases; when the flow rate is small, the inclination angle of the water outlet plate 42 decreases. The aeration volume is adjusted in real time according to the water quality detection data of the previous level rainwater purification device 3. If the DO of the effluent from the previous level rainwater purification device 3 is less than 6mg / L (GB3838 Class II water standard), the aeration volume is increased, otherwise the aeration volume is reduced.

[0079] The bottom and top of the purification support tank 33 and the top of the water outlet support tank 41 are provided with sockets and plug-ins. The plug-in of each support tank is inserted into the socket of the adjacent support tank to achieve assembly.

[0080] The present invention also includes a control device. An online water quality detector 34 is installed within the rainwater purification device 3. This detector includes an online conductivity probe, a temperature probe, a color probe, a pH probe, and a dissolved oxygen probe. A real-time water depth probe 44 is installed within the aeration outlet device 4. These detectors, along with the lifting mechanism 43, the aeration outlet device 4, the electrocatalytic unit 31, and the UV lamp assembly 32, are electrically connected to the control device. The online water quality detector 34 can be mounted on the end surface of the retractable, insulated, permeable plate 312 near the UV lamp assembly 32.

[0081] The real-time water depth detection probe 44 detects the water depth of the aeration outlet device 4 and determines the initial rainwater inflow flow rate based on the water depth of the aeration outlet device 4; if the flow rate is large, the control device controls the lifting mechanism 43 to increase the inclination angle of the water outlet plate 42; if the flow rate is small, the control device controls the lifting mechanism 43 to lower the inclination angle of the water outlet plate 42.

[0082] An online water quality detector 34 performs online water quality testing on the rainwater in each rainwater purification device 3, measuring conductivity, temperature, color, pH, and dissolved oxygen. The quality of the rainwater is assessed based on the corresponding end-face water quality standard for each rainwater purification device 3. If the water quality is poor, the control device controls the aeration piping 45 to increase the aeration volume, raise the voltage of the electrocatalytic unit 31, and increase the power of the UV lamp assembly 32. If the water quality is good, the control device controls the aeration piping 45 to decrease the aeration volume, lower the voltage of the electrocatalytic unit 31, and lower the power of the UV lamp assembly 32.

[0083] The initial rainwater purification method of this embodiment includes the following steps:

[0084] The filtering unit 11 filters the initial rainwater, and the filtered rainwater precipitates fine impurities on the impurity collecting unit 12 . The rainwater is then discharged to the bank permeable plate 2 , and the fine impurities are discharged through the impurity collecting unit 12 and the impurity discharging unit 13 .

[0085] The rainwater passes through the bank permeable plate 2 and enters into several layers of rainwater purification devices 3 in sequence for electrocatalytic treatment and ultraviolet light irradiation; the rainwater then enters the aeration outlet device 4 for aeration treatment, and after aeration, the rainwater is discharged into the water area.

[0086] like Figure 15 As shown, the water depth of the aeration outlet device 4 is detected in real time, and the initial rainwater inlet flow rate is determined according to the water depth of the aeration outlet device 4; if the flow rate is large, the inclination angle of the outlet plate 42 is increased; if the flow rate is small, the inclination angle of the outlet plate 42 is reduced.

[0087] The rainwater in each rainwater purification device 3 is subjected to online water quality testing, and the test items include conductivity, temperature, chromaticity, pH value and dissolved oxygen. The quality of the rainwater is judged according to the end surface water quality standard corresponding to each rainwater purification device 3. If the water quality is poor, the aeration volume is increased, the voltage of the electrocatalytic unit 31 is increased, and the power of the ultraviolet lamp group 32 is increased; if the water quality is good, the aeration volume, the voltage of the electrocatalytic unit 31, and the power of the ultraviolet lamp group 32 are reduced.

[0088] After the initial rainwater is collected, the electrocatalytic unit 31 and the ultraviolet lamp group 32 are turned off and aeration is continued.

[0089] The present invention can detect the water depth of the aeration outlet device 4 in real time, determine the initial rainwater inflow rate based on the water depth, and control the inclination angle of the outlet plate 42 based on the inflow rate. The present invention performs online water quality testing on the rainwater in each rainwater purification device 3 and adjusts the aeration rate, the voltage of the electrocatalytic unit 31, and the power of the ultraviolet lamp group 32 based on the water quality, achieving accurate control of the initial rainwater purification process.

[0090] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that falls within the scope defined by the claims of the present invention falls within the scope of protection of the present invention.

Claims

1. An initial rainwater purification system, characterized by: The invention comprises a plurality of assembled filter devices (1) arranged in a slope protection area, wherein the upper layer of the filter device (1) is a filter unit (11), an impurity collecting unit (12) is arranged on the lower side of the filter unit (11), the impurity collecting unit (12) is connected to an impurity discharging unit (13), and a drainage outlet (1111) is arranged on the lower side along the slope protection direction between the filter unit (11) and the impurity collecting unit (12); the invention also comprises a bank permeable plate (2) located on the bank and arranged in sequence from top to bottom, a plurality of layers of rainwater purification devices (3) and an aeration outlet device (4), wherein an electrocatalytic unit (31) and an ultraviolet lamp group (32) are arranged in the rainwater purification device (3), and an outlet (421) for discharging purified water into a water area is provided on the aeration outlet device (4); The impurity discharge unit (13) comprises an impurity discharge trough (131), the impurity discharge trough (131) is connected to the output end of the impurity collection unit (12), a scraping conveyor belt (132) is installed in the impurity discharge trough (131), and an impurity lifting conveyor belt (133) is installed on one side of the impurity discharge trough (131) located at the outlet end of the scraping conveyor belt (132); The impurity collecting unit (12) comprises a bottom plate (121), a plurality of transverse collecting spirals (122) are mounted on the bottom plate (121), a transverse impurity collecting trough (123) is provided on one side of the transverse collecting spiral (122) close to the bank permeable plate (2), and the impurity collecting trough is fixed on the bottom plate (121); a longitudinal collecting spiral (124) is also mounted on the bottom plate (121), a longitudinal impurity collecting trough (125) is fixed on the bottom plate (121), the longitudinal collecting spiral (124) is arranged close to the longitudinal impurity collecting trough (125), the outlet ends of the plurality of transverse collecting spirals (122) are connected to the longitudinal impurity collecting trough (125), the output end of the longitudinal collecting spiral (124) is connected to the impurity discharging unit (13), and the drainage outlet (1111) is arranged on the lower side along the slope protection direction between the bottom plate (121) and the filter unit (11); The rainwater purification device (3) further comprises a purification support tank (33), and the electrocatalytic unit (31) comprises a telescopic anode plate (311), a telescopic insulating water-permeable plate (312), and a telescopic cathode plate (313) sequentially connected to the purification support tank (33) from top to bottom.

2. The initial rainwater purification system according to claim 1, characterized in that: The filter unit (11) comprises a water-permeable support plate (111); a drain outlet (1111) is provided between the water-permeable support plate (111) and the impurity collection unit (12) on the lower side along the slope protection direction; a plurality of filter material filling blocks (112) are provided on the water-permeable support plate (111); and the filter material filling blocks (112) are filled with filter material.

3. The initial rainwater purification system according to claim 2, characterized in that: A plurality of internal support rings (1121) are sequentially arranged in the filter material filling block (112) from top to bottom. The internal support rings (1121) divide the internal space of the filter material filling block (112) into a plurality of filter material filling layers. The particle sizes of the filter materials in the filter material filling layers decrease sequentially from top to bottom.

4. The initial rainwater purification system according to claim 1, characterized in that: The plurality of rainwater purification devices (3) are rotated 90 degrees relative to the upper rainwater purification device (3) in the same direction from top to bottom.

5. The initial rainwater purification system according to claim 1, characterized in that: The aeration water outlet device (4) comprises a water outlet support groove (41), a water outlet plate (42) is rotatably connected in the water outlet support groove (41), a lifting mechanism (43) is provided between the other end of the water outlet plate (42) and the water outlet support groove (41), an aeration pipeline (45) is installed on the water outlet plate (42), and a water outlet (421) is provided on one side of the water outlet support groove (41) close to the lower end of the water outlet plate (42).

6. The initial rainwater purification system according to claim 5, characterized in that: The invention also includes a control device. An online water quality detector (34) is installed in the rainwater purification device (3). The online water quality detector (34) has a built-in conductivity online detection probe, a temperature online detection probe, a color online detection probe, a pH value online detection probe, and a dissolved oxygen online detection probe. A real-time water depth detection probe (44) is installed in the aeration outlet device (4). The online water quality detector (34), the real-time water depth detection probe (44), the lifting mechanism (43), the aeration outlet device (4), the electrocatalytic unit (31), and the ultraviolet lamp group (32) are respectively electrically connected to the control device.

7. A method for purifying initial rainwater using the initial rainwater purification system according to claim 6, characterized in that: The following steps are involved: The filtering unit (11) filters the initial rainwater, and the filtered rainwater is precipitated on the impurity collection unit (12) to remove fine impurities. The rainwater is then discharged to the bank permeable plate (2), and the fine impurities are discharged through the impurity collection unit (12) and the impurity discharge unit (13); The rainwater passes through the bank permeable plate (2) and enters into several layers of rainwater purification devices (3) in sequence for electrocatalytic treatment and ultraviolet light irradiation; the rainwater then enters the aeration outlet device (4) for aeration treatment, and after aeration, the rainwater is discharged into the water area; Real-time detection of the water depth of the aeration outlet device (4) and determination of the initial rainwater inflow rate based on the water depth of the aeration outlet device (4); if the flow rate is large, increasing the inclination angle of the outlet plate (42); if the flow rate is small, decreasing the inclination angle of the outlet plate (42); The rainwater in each rainwater purification device (3) is tested online for water quality, including conductivity, temperature, chromaticity, pH value and dissolved oxygen; the quality of the rainwater is determined based on the end surface water quality standard corresponding to each rainwater purification device (3); if the water quality is poor, the aeration volume is increased, the voltage of the electrocatalytic unit (31) is increased, and the power of the ultraviolet lamp group (32) is increased; if the water quality is good, the aeration volume is reduced, the voltage of the electrocatalytic unit (31) is reduced, and the power of the ultraviolet lamp group (32) is reduced; After the initial rainwater collection is completed, the electrocatalytic unit (31) and the ultraviolet lamp group (32) are turned off and aeration is continued.

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