Rainwater runoff purification treatment system and purification treatment method

Abstract

The invention discloses a rainwater runoff purification treatment system and method, the rainwater runoff purification treatment system comprises a physical treatment unit, a biological purification unit and a chemical disinfection unit; the physical treatment unit comprises a primary filtration part, a medium filtration buffer part and a flocculation fine filtration part which are sequentially arranged in the flow direction, the primary filtration part comprises a primary filtration tank connected with the tail end of the rainwater pipe channel, the medium filtration buffer part comprises a medium filtration tank and a buffer pool, and the flocculation fine filtration part comprises a flocculation pool and a fine filtration assembly; the biological purification unit comprises an anaerobic purification tank and an aerobic purification tank which are sequentially arranged in the flow direction, a main water outlet pipe of the fine filtration assembly is connected with the anaerobic purification tank, and an aeration pipe connected with an oxygenation pump is arranged in the aerobic purification tank; the chemical disinfection unit comprises a chemical disinfection tank connected with the aerobic purification tank, and a drainage pipe of the chemical disinfection tank is connected into a nearby river and lake water body. Rainwater runoff discharged from the tail end of the rainwater pipe canal can be fully purified, and nearby river and lake water bodies are prevented from being polluted.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a rainwater runoff purification treatment system and a purification treatment method. Background Art

[0002] After various pollutants on the street surface are washed away by rainwater, rainwater runoff with a high content of pollutants is formed. There are multiple stormwater inlets under the street surface, and the stormwater inlets are connected to the stormwater pipes. The rainwater runoff on the street surface flows into the stormwater pipes through the stormwater inlets and is directly discharged into nearby rivers and lakes.

[0003] At present, most of the stormwater outlets under the street pavement have no ability to intercept pollutants in rainwater runoff. If the rainwater runoff carrying high pollutant content flows into the stormwater pipes through the stormwater outlets under the street pavement and is directly discharged into rivers and lakes, it will cause a certain degree of harm to the rivers and lakes. Therefore, in order to prevent the rainwater runoff from being directly discharged into rivers and lakes and causing harm to the rivers and lakes, the rainwater runoff needs to be purified before being discharged into rivers and lakes. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the present invention provides a rainwater runoff purification system and purification method, which can fully purify the rainwater runoff discharged from the end of the rainwater pipe channel to prevent pollution of nearby rivers and lakes.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A rainwater runoff purification treatment system comprises a physical treatment unit, a biological purification unit and a chemical disinfection unit; the physical treatment unit comprises a primary filter component, a middle filter buffer component and a flocculation fine filter component arranged in sequence along the flow direction, the primary filter component comprises a primary filter tank, the middle filter buffer component comprises a middle filter tank and a buffer tank, the flocculation fine filter component comprises a flocculation tank and a fine filter assembly, one side of the primary filter tank is connected to the end of a rainwater pipe channel and the other side is connected to the middle filter tank, the middle filter tank is connected to the flocculation tank through the buffer tank, and the fine filter assembly is used for fine filtering the rainwater runoff obtained after flocculation in the flocculation tank; the biological purification unit comprises an anaerobic purification tank and an aerobic purification tank arranged in sequence along the flow direction, the total outlet pipe of the fine filter assembly is connected to the anaerobic purification tank, and the aerobic purification tank is provided with an aeration pipe connected to an oxygenation pump; the chemical disinfection unit comprises a chemical disinfection tank connected to the aerobic purification tank, and the drainage pipe of the chemical disinfection tank is connected to a nearby river and lake water body.

[0007] Furthermore, the middle part of the rear side wall of the primary filter tank is connected to the end of the rainwater pipe channel and the left and right ends of the front side wall are both provided with a first filter screen plate. In the primary filter tank, a plurality of second filter screen plates are arranged in sequence from left to right between the front side wall and the rear side wall and are located between the first filter screen plates on the left and right sides. There are two middle filter tanks distributed on the left and right sides of the buffer tank. The primary filter tank is connected to the left middle filter tank through the left first filter screen plate, and the primary filter tank is connected to the right middle filter tank through the right first filter screen plate. In each middle filter tank, a plurality of third filter screen plates are arranged in sequence from left to right between the front side wall and the rear side wall and are located between the first filter screen plates on the left and right sides. A fourth filter screen plate is provided on the left and right walls of the buffer tank. The middle filter tank on the left is connected to the buffer tank through the left fourth filter screen plate, and the middle filter tank on the right is connected to the buffer tank through the right fourth filter screen plate. A fifth filter screen plate is provided on the front side wall of the buffer tank. The flocculation tank is located at the front end of the buffer tank and is connected to the buffer tank through the fifth filter screen plate.

[0008] Furthermore, a flocculant dosing device is provided above the flocculation tank, and the fine filter components are multiple and arranged side by side from left to right at corresponding positions of the flocculation tank. Each of the fine filter components includes a centrifugal pump arranged in the flocculation tank and a step frame arranged at the front end of the flocculation tank. The step frame includes a first step surface, a second step surface and a third step surface with top heights decreasing successively. The first step surface, the second step surface and the third step surface are each provided with a plurality of fine filter cartridges, and the number of fine filter cartridges on the first step surface, the second step surface and the third step surface is equal. The water outlet of the centrifugal pump is connected to the water inlet of each fine filter cartridge on the first step surface, the water outlet of each fine filter cartridge on the first step surface is connected to the corresponding water inlet of the fine filter cartridge on the second step surface, the water outlet of each fine filter cartridge on the second step surface is connected to the corresponding water inlet of the fine filter cartridge on the third step surface, and the water outlet of each fine filter cartridge on the third step surface is connected to the main water outlet pipe through the corresponding branch water outlet pipe, and the main water outlet pipe is connected to the anaerobic purification tank.

[0009] Furthermore, there are multiple centrifugal pumps in each of the fine filtration components, and the fine filter cartridges on the first step surface are divided into multiple groups according to the number of centrifugal pumps, the number of fine filter cartridges in each group is equal, and the water outlet of each centrifugal pump is connected to the water inlet of a corresponding group of fine filter cartridges on the first step surface.

[0010] Furthermore, the water outlet of each centrifugal pump is connected to a corresponding group of fine filter cartridge water inlets on the first step surface through a first connecting pipe, the water outlets of each fine filter cartridge on the first step surface are connected to the corresponding fine filter cartridge water inlets on the second step surface through a second connecting pipe, and the water outlets of each fine filter cartridge on the second step surface are connected to the corresponding fine filter cartridge water inlets on the third step surface through a third connecting pipe.

[0011] Furthermore, the fine filter cylinder includes an outer cylinder body with an opening at the top, a first mud delivery pipe with a first valve is connected to the bottom of the outer cylinder body, the top of the first mud delivery pipe is inserted into the bottom of the outer cylinder body, a fine filter inner cylinder with openings at the top and bottom is fixed in the outer cylinder body, the bottom end of the fine filter inner cylinder is connected to the top of the first mud delivery pipe, the top opening of the fine filter inner cylinder forms a water inlet of the fine filter cylinder, and a water outlet is provided at the bottom of the outer cylinder body to form a water outlet of the fine filter cylinder.

[0012] Furthermore, there are two aerobic purification tanks, which are respectively called the first aerobic purification tank and the second aerobic purification tank. The first aerobic purification tank is arranged between the anaerobic purification tank and the second aerobic purification tank, and the first aerobic purification tank is connected to the anaerobic purification tank and the second aerobic purification tank through a water pipe with a second valve. The first aerobic purification tank and the second aerobic purification tank are each provided with a plurality of aeration pipes, and each of the aeration pipes is connected to an aeration pump through an air supply pipe. The bottom ends of the anaerobic purification tank, the first aerobic purification tank and the second aerobic purification tank are each connected to a mud discharge pipe with a third valve, and the bottom end of each mud discharge pipe is connected to the second mud supply pipe.

[0013] Furthermore, the first valve is arranged at the top of the first mud conveying pipe, and a first spiral conveying rod is provided in the first mud conveying pipe below the first valve, the bottom end of the first spiral conveying rod is connected to the first motor through a first reducer, and the bottom of the first mud conveying pipe is connected to a first mud outlet pipe; a second spiral conveying rod is provided in the second mud conveying pipe, one end of the second spiral conveying rod is connected to the second motor through a second reducer, and one end of the second mud conveying pipe is connected to a second mud outlet pipe; the bottom of the flocculation tank is connected to a suction pump through a third mud outlet pipe.

[0014] Furthermore, a disinfectant delivery device is provided above the chemical disinfection tank, and an agitator is provided inside the chemical disinfection tank.

[0015] A rainwater runoff purification method, using the above-mentioned rainwater runoff purification system for purification, comprises the following steps:

[0016] S1, the rainwater runoff discharged from the end of the rainwater pipe enters the primary filter tank to filter the large particle pollutants in the rainwater runoff, and then the rainwater runoff enters the middle filter tank to filter most of the medium particle pollutants in the rainwater runoff, and then the rainwater runoff enters the buffer tank to filter the remaining medium particle pollutants in the rainwater runoff, and then the rainwater runoff enters the flocculation tank and is treated by flocculation to precipitate the small particle pollutants in the rainwater runoff, and then the rainwater runoff obtained after the precipitation treatment in the flocculation tank is finely filtered by the fine filtration component to remove the micro particle pollutants in the rainwater runoff;

[0017] S2, the rainwater runoff after fine filtration is transported to the anaerobic purification tank through the main outlet pipe, and the rainwater runoff is anaerobically purified by the anaerobic bacteria in the anaerobic purification tank. The rainwater runoff after anaerobic purification enters the aerobic purification tank, and air is transported to the aeration pipe through the aeration pump, and air is discharged into the rainwater runoff in the aerobic purification tank through the aeration pipe, so that the aerobic bacteria in the aerobic purification tank are fully in contact with the air, so as to aerobically purify the rainwater runoff;

[0018] S3. The rainwater runoff after aerobic purification treatment enters the chemical disinfection tank for sterilization and disinfection, and the rainwater runoff after sterilization and disinfection is discharged into nearby rivers and lakes through the drainage pipe.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] The rainwater runoff purification treatment system of the present invention is used to purify the rainwater runoff discharged from the end of the rainwater pipe, specifically: the rainwater runoff discharged from the end of the rainwater pipe enters the primary filter tank to filter the large particle pollutants in the rainwater runoff, and then the rainwater runoff enters the middle filter tank to filter most of the medium particle pollutants in the rainwater runoff, and then the rainwater runoff enters the buffer tank to filter the remaining medium particle pollutants in the rainwater runoff, and then the rainwater runoff enters the flocculation tank and is flocculated to precipitate the small particle pollutants in the rainwater runoff, and then the rainwater runoff obtained after the precipitation treatment in the flocculation tank is treated by fine filtration. Fine filtration is used to remove micro-particle pollutants in rainwater runoff; the rainwater runoff after fine filtration is transported to the anaerobic purification tank through the main outlet pipe, and the rainwater runoff is anaerobically purified by anaerobic bacteria in the anaerobic purification tank. The rainwater runoff after anaerobic purification enters the aerobic purification tank, and air is transported to the aeration pipe through the aeration pump. The air is discharged into the rainwater runoff in the aerobic purification tank through the aeration pipe, so that the aerobic bacteria in the aerobic purification tank are fully in contact with the air to aerobically purify the rainwater runoff; the rainwater runoff after aerobic purification enters the chemical disinfection tank for sterilization and disinfection, and the rainwater runoff after sterilization and disinfection is discharged into the nearby rivers and lakes through the drainage pipe. In this way, large particle pollutants in rainwater runoff can be filtered through the primary filter tank, most of the medium particle pollutants in rainwater runoff can be filtered through the middle filter tank, the remaining medium particle pollutants in rainwater runoff can be filtered through the buffer tank, the small particle pollutants in rainwater runoff can be precipitated through the flocculation tank, the rainwater runoff obtained after sedimentation treatment in the flocculation tank can be finely filtered through the fine filtration component to remove micro-particle pollutants in the rainwater runoff, the anaerobic bacteria in the anaerobic purification tank can anaerobically purify the rainwater runoff after fine filtration, and the aerobic bacteria in the aerobic purification tank can purify the rainwater runoff after anaerobic purification treatment. The runoff is subjected to aerobic purification treatment, and anaerobic purification treatment is combined with aerobic purification treatment to fully remove organic pollutants in the rainwater runoff. The rainwater runoff after aerobic purification treatment can be sterilized and disinfected through a chemical disinfection tank, and the rainwater runoff after sterilization and disinfection is discharged into nearby rivers and lakes. In summary, the rainwater runoff purification treatment system of the present invention can fully remove various particulate pollutants in the rainwater runoff before the rainwater runoff is subjected to biological purification treatment. The rainwater runoff purification treatment system of the present invention can fully purify the rainwater runoff discharged from the end of the rainwater pipe to prevent pollution of nearby rivers and lakes.

[0021] In the present invention, the middle part of the rear side wall of the primary filter tank is connected to the end of the rainwater pipe channel, and the left and right ends of the front side wall are both provided with a first filter screen plate, and a plurality of second filter screen plates are arranged in sequence from left to right between the front side wall and the rear side wall in the primary filter tank, and are located between the first filter screen plates on the left and right sides, there are two middle filter tanks and are distributed on the left and right sides of the buffer tank, the primary filter tank is connected to the left middle filter tank through the left first filter screen plate, and the primary filter tank is connected to the right middle filter tank through the right first filter screen plate, and in each middle filter tank, a plurality of third filter screen plates are arranged in sequence from left to right between the front side wall and the rear side wall, and are located between the first filter screen plates on the left and right sides, and a fourth filter screen plate is arranged on the left and right walls of the buffer tank, the left middle filter tank is connected to the buffer tank through the left fourth filter screen plate, and the right middle filter tank is connected to the buffer tank through the right fourth filter screen plate, and a fifth filter screen plate is arranged on the front side wall of the buffer tank, and the flocculation tank is located at the front end of the buffer tank and is connected through the fifth filter screen plate. The filter plate is connected to the buffer tank; in this way, most of the large particle pollutants in the rainwater runoff can be filtered through the second filter plates in the primary filter tank, and the remaining large particle pollutants in the rainwater runoff can be thoroughly filtered through the left and right first filter plates in the primary filter tank. The rainwater runoff filtered by the left first filter plate enters the left middle filter tank, and the rainwater runoff filtered by the right first filter plate enters the right middle filter tank. The rainwater runoff in the middle filter tank is filtered by the third filter plates and the corresponding fourth filter plates to remove most of the medium particle pollutants in the rainwater runoff. After that, the rainwater runoff in the left middle filter tank is filtered by the left fourth filter plate and enters the buffer tank. The rainwater runoff in the right middle filter tank is filtered by the right fourth filter plate and enters the buffer tank. The rainwater runoff in the buffer tank is filtered by the fifth filter plate to remove the remaining medium particle pollutants in the rainwater runoff. The rainwater runoff filtered by the fifth filter plate enters the flocculation tank.

[0022] In the present invention, a flocculant delivery device is provided above the flocculation tank, and there are multiple fine filter components which are arranged side by side from left to right at corresponding positions of the flocculation tank. Each fine filter component includes a centrifugal pump arranged in the flocculation tank and a step frame arranged at the front end of the flocculation tank. The step frame includes a first step surface, a second step surface and a third step surface whose top heights decrease successively. Multiple fine filter cartridges are arranged on the first step surface, the second step surface and the third step surface, and the number of fine filter cartridges on the first step surface, the second step surface and the third step surface is equal. The water outlet of the centrifugal pump is connected to the water inlet of each fine filter cartridge on the first step surface, the water outlet of each fine filter cartridge on the first step surface is connected to the corresponding water inlet of the fine filter cartridge on the second step surface, the water outlet of each fine filter cartridge on the second step surface is connected to the corresponding water inlet of the fine filter cartridge on the third step surface, and the water outlet of each fine filter cartridge on the third step surface is connected to one end of the main water outlet pipe through the corresponding branch water outlet pipe, and the other end of the main water outlet pipe is connected to the atomizer The anaerobic purification tank is connected; in this way, flocculant is added into the flocculation tank through the flocculant adding device to precipitate small particle pollutants in the rainwater runoff entering the flocculation tank, and then the rainwater runoff obtained after the sedimentation treatment in the flocculation tank is sucked into each fine filter cylinder on the first step surface through the centrifugal pump of each fine filter component, and the rainwater runoff obtained after fine filtration by each fine filter cylinder on the first step surface enters the corresponding fine filter cylinder on the second step surface by gravity, and the rainwater runoff obtained after fine filtration by each fine filter cylinder on the second step surface enters the corresponding fine filter cylinder on the third step surface by gravity, and the rainwater runoff obtained after fine filtration by each fine filter cylinder on the third step surface enters the main outlet pipe through the corresponding branch outlet pipe, and the rainwater runoff in the main outlet pipe enters the anaerobic purification tank. Therefore, the fine filtration component of the present invention can fully finely filter the rainwater runoff obtained after the sedimentation treatment in the flocculation tank to fully remove the micro-particle pollutants in the rainwater runoff. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the rainwater runoff purification treatment system in the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the physical processing unit;

[0025] Figure 3 It is a schematic diagram of the specific structure of the fine filter cartridge on the third step surface;

[0026] Figure 4 for Figure 2 The schematic diagram of the structure showing another direction of connection between the buffer tank and the flocculation tank after the flocculant delivery device;

[0027] Figure 5 It is a schematic diagram of the specific structure of the biological purification unit;

[0028] Figure 6It is a schematic diagram of the specific structure of the chemical disinfection unit.

[0029] Explanation of reference numerals in the figure: 101, primary filter tank, 102, first filter screen plate, 102, second filter screen plate, 201, middle filter tank, 202, buffer tank, 203, third filter screen plate, 204, fourth filter screen plate, 205, fifth filter screen plate, 301, flocculation tank, 302, flocculant delivery device, 303, centrifugal pump, 304, step frame, 30401, first step surface, 30402, second step surface, 30403, third step surface, 305, fine filter cylinder, 30501, outer cylinder, 30502, first valve, 30503, first mud delivery pipe, 30504, fine filter inner cylinder, 30505, water outlet pipe, 30506, first spiral conveying rod, 30507, first reducer, 30508, the first motor, 30509, the first mud outlet pipe, 306, the first connecting pipe, 307, the second connecting pipe, 308, the third connecting pipe, 309, the third mud outlet pipe, 3010, the main water outlet pipe, 401, the anaerobic purification tank, 402, the oxygen pump, 403, the aeration pipe, 404, the first aerobic purification tank, 405, the second aerobic purification tank, 406, the third valve, 407, the mud discharge pipe, 408, the second mud delivery pipe, 409, the second spiral conveying rod, 4010, the second reducer, 4011, the second motor, 4012, the second mud outlet pipe, 501, the chemical disinfection tank, 502, the disinfectant delivery equipment, 503, the stirring rod, 504, the third reducer, 505, the third motor, 6, the rainwater pipe. DETAILED DESCRIPTION

[0030] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0034] like Figure 1-2 As shown, a rainwater runoff purification treatment system includes a physical treatment unit, a biological purification unit and a chemical disinfection unit; the physical treatment unit includes a primary filter component, a middle filter buffer component and a flocculation fine filter component arranged in sequence along the flow direction, the primary filter component includes a primary filter tank 101, the middle filter buffer component includes a middle filter tank 201 and a buffer tank 202, the flocculation fine filter component includes a flocculation tank 301 and a fine filter assembly, one side of the primary filter tank 101 is connected to the end of the rainwater pipe 6 and the other side is connected to the middle filter tank 201, and the middle filter tank 201 is connected to the buffer tank 202. Pool 202 is connected to flocculation pool 301, and the fine filtration component is used to finely filter the rainwater runoff obtained after flocculation in flocculation pool 301; the biological purification unit includes an anaerobic purification pool 401 and an aerobic purification pool arranged in sequence along the flow direction, and the total outlet pipe 3010 of the fine filtration component is connected to the anaerobic purification pool 401, and the aerobic purification pool is provided with an aeration pipe 403 connected to the oxygenation pump 402; the chemical disinfection unit includes a chemical disinfection pool 501 connected to the aerobic purification pool, and the drainage pipe of the chemical disinfection pool 501 is connected to the nearby river and lake water bodies.

[0035] The rainwater runoff purification system of the present invention is used to purify the rainwater runoff discharged from the end of the rainwater pipe 6, specifically: the rainwater runoff discharged from the end of the rainwater pipe 6 enters the primary filter tank 101 to filter the large particle pollutants in the rainwater runoff, and then the rainwater runoff enters the middle filter tank 201 to filter most of the medium particle pollutants in the rainwater runoff, and then the rainwater runoff enters the buffer tank 202 to filter the remaining medium particle pollutants in the rainwater runoff, and then the rainwater runoff enters the flocculation tank 301 and is flocculated to precipitate the small particle pollutants in the rainwater runoff, and then the rainwater runoff obtained after the precipitation treatment in the flocculation tank 301 is finely filtered by the fine filtration component. To remove micro-particle pollutants in rainwater runoff; the rainwater runoff after fine filtration is transported to the anaerobic purification tank 401 through the main outlet pipe 3010, and the rainwater runoff is anaerobically purified by the anaerobic bacteria in the anaerobic purification tank 401. The rainwater runoff after anaerobic purification enters the aerobic purification tank, and air is transported to the aeration pipe 403 through the aeration pump 402. The air is discharged into the rainwater runoff in the aerobic purification tank through the aeration pipe 403, so that the aerobic bacteria in the aerobic purification tank are fully in contact with the air, so as to aerobically purify the rainwater runoff; the rainwater runoff after aerobic purification enters the chemical disinfection tank 501 for sterilization and disinfection, and the rainwater runoff after sterilization and disinfection is discharged into the nearby river and lake water bodies through the drainage pipe. In this way, large particle pollutants in rainwater runoff can be filtered through the primary filter tank 101, most of the medium particle pollutants in rainwater runoff can be filtered through the middle filter tank 201, the remaining medium particle pollutants in rainwater runoff can be filtered through the buffer tank 202, the small particle pollutants in rainwater runoff can be precipitated through the flocculation tank 301, the rainwater runoff obtained after precipitation treatment in the flocculation tank 301 can be finely filtered through the fine filtration component to remove micro-particle pollutants in the rainwater runoff, the anaerobic bacteria in the anaerobic purification tank 401 can be used to anaerobically purify the rainwater runoff after fine filtration, and the aerobic bacteria in the aerobic purification tank can be used to purify the rainwater runoff after anaerobic purification. The treated rainwater runoff is subjected to aerobic purification treatment, and anaerobic purification treatment is combined with aerobic purification treatment to fully remove organic pollutants in the rainwater runoff. The rainwater runoff after aerobic purification treatment can be sterilized and disinfected by the chemical disinfection tank 501, and the rainwater runoff after sterilization and disinfection is discharged into nearby rivers and lakes. In summary, the rainwater runoff purification treatment system in the present invention can fully remove various particulate pollutants in the rainwater runoff before the rainwater runoff is subjected to biological purification treatment. The rainwater runoff purification treatment system in the present invention can fully purify the rainwater runoff discharged from the end of the rainwater pipe 6 to prevent pollution of nearby rivers and lakes.

[0036] In one embodiment, Figure 2As shown, the middle part of the rear side wall of the primary filter tank 101 is connected to the end of the rainwater pipe 6, and the left and right ends of the front side wall are provided with a first filter screen plate 102. In the primary filter tank 101, a plurality of second filter screen plates 103 are arranged in sequence from left to right between the front side wall and the rear side wall, and are located between the first filter screen plates 102 on the left and right sides. There are two middle filter tanks 201 and they are distributed on the left and right sides of the buffer tank 202. The primary filter tank 101 is connected to the left middle filter tank 201 through the left first filter screen plate 102, and the primary filter tank 101 is connected to the right middle filter tank 201 through the right first filter screen plate 102. Each middle filter tank 201 has a filter screen plate 103 in it. A plurality of third filter screen plates 203 are arranged in sequence from left to right between the front side wall and the rear side wall, and are located between the first filter screen plates 102 on the left and right sides. A fourth filter screen plate 204 is provided on the left and right walls of the buffer tank 202. The left middle filter tank 201 is connected to the buffer tank 202 through the left fourth filter screen plate 204, and the right middle filter tank 201 is connected to the buffer tank 202 through the right fourth filter screen plate 204. A fifth filter screen plate 205 is provided on the front side wall of the buffer tank 202. The flocculation tank 301 is located at the front end of the buffer tank 202 and is connected to the buffer tank 202 through the fifth filter screen plate 205. Figure 4 .

[0037] In this way, most of the large particle pollutants in the rainwater runoff can be filtered through the second filter mesh plates 103 in the primary filter tank 101, and the remaining large particle pollutants in the rainwater runoff can be thoroughly filtered through the left and right first filter mesh plates 102 in the primary filter tank 101. The rainwater runoff filtered by the left first filter mesh plate 102 enters the left middle filter tank 201, and the rainwater runoff filtered by the right first filter mesh plate 102 enters the right middle filter tank 201. The rainwater runoff in the middle filter tank 201 passes through the third filter mesh plates 203 and the corresponding first filter mesh plates 102. The four filter screens 204 are used to filter to remove most of the medium-sized particle pollutants in the rainwater runoff. After that, the rainwater runoff in the left middle filter tank 201 is filtered by the fourth filter screen plate 204 on the left and enters the buffer tank 202. The rainwater runoff in the right middle filter tank 201 is filtered by the fourth filter screen plate 204 on the right and enters the buffer tank 202. The rainwater runoff in the buffer tank 202 is filtered by the fifth filter screen plate 205 to remove the remaining medium-sized particle pollutants in the rainwater runoff. The rainwater runoff filtered by the fifth filter screen plate 205 enters the flocculation tank 301.

[0038] In one embodiment, Figure 4 As shown, a flocculant delivery device 302 is provided above the flocculation tank 301. Figure 2As shown, there are multiple fine filter components which are arranged side by side from left to right at corresponding positions of the flocculation tank 301, each fine filter component includes a centrifugal pump 303 arranged in the flocculation tank 301 and a step frame 304 arranged at the front end of the flocculation tank 301, the step frame 304 includes a first step surface 30401, a second step surface 30402 and a third step surface 30403 whose top heights decrease in sequence, and a plurality of fine filter cartridges 305 are arranged on the first step surface 30401, the second step surface 30402 and the third step surface 30403, and the fine filter cartridges 305 on the first step surface 30401, the second step surface 30402 and the third step surface 30403 The number of filter cartridges 305 is equal, the water outlet of the centrifugal pump 303 is connected to the water inlet of each fine filter cartridge 305 on the first step surface 30401, the water outlet of each fine filter cartridge 305 on the first step surface 30401 is connected to the water inlet of the corresponding fine filter cartridge 305 on the second step surface 30402, the water outlet of each fine filter cartridge 305 on the second step surface 30402 is connected to the water inlet of the corresponding fine filter cartridge 305 on the third step surface 30403, the water outlet of each fine filter cartridge 305 on the third step surface 30403 is connected to the main water outlet pipe 3010 through the corresponding branch water outlet pipe 30505, and the main water outlet pipe 3010 is connected to the anaerobic purification tank 401, see Figure 1 .

[0039] In this way, flocculant is added into the flocculation tank 301 through the flocculant adding device 302 to precipitate small particle pollutants in the rainwater runoff entering the flocculation tank 301, and then the rainwater runoff obtained after the sedimentation treatment in the flocculation tank 301 is sucked into each fine filter cartridge 305 on the first step surface 30401 through the centrifugal pump 303 of each fine filter component. The rainwater runoff obtained after fine filtration by each fine filter cartridge 305 on the first step surface 30401 enters the corresponding fine filter cartridge 305 on the second step surface 30402 by gravity, and is filtered by the fine filter cartridge 305 on the second step surface 30402. The rainwater runoff obtained after fine filtration by each fine filter cartridge 305 enters the corresponding fine filter cartridge 305 on the third step surface 30403 by gravity, and the rainwater runoff obtained after fine filtration by each fine filter cartridge 305 on the third step surface 30403 enters the main outlet pipe 3010 through the corresponding branch outlet pipe 30505, and the rainwater runoff in the main outlet pipe 3010 enters the anaerobic purification tank 401. Therefore, the fine filtration component of the present invention can fully finely filter the rainwater runoff obtained after sedimentation treatment in the flocculation tank 301 to fully remove micro-particle pollutants in the rainwater runoff.

[0040] Among them, Figure 2As shown, there are multiple centrifugal pumps 303 in each fine filter assembly, and the fine filter cartridges 305 on the first step surface 30401 are divided into multiple groups according to the number of centrifugal pumps 303, and the number of fine filter cartridges 305 in each group is equal. The water outlet of each centrifugal pump 303 is connected to the water inlet of a corresponding group of fine filter cartridges 305 on the first step surface 30401. Preferably, the water outlet of each centrifugal pump 303 is connected to the water inlet of a corresponding group of fine filter cartridges 305 on the first step surface 30401 through a first connecting pipe 306, the water outlets of each fine filter cartridge 305 on the first step surface 30401 are connected to the water inlet of the corresponding fine filter cartridge 305 on the second step surface 30402 through a second connecting pipe 307, and the water outlets of each fine filter cartridge 305 on the second step surface 30402 are connected to the water inlet of the corresponding fine filter cartridge 305 on the third step surface 30403 through a third connecting pipe 308.

[0041] Among them, Figure 3 As shown, the fine filter cartridge 305 includes an outer cylinder body 30501 with an opening at the top, a first mud delivery pipe 30503 with a first valve 30502 is connected to the bottom of the outer cylinder body 30501, the top of the first mud delivery pipe 30503 is inserted into the bottom of the outer cylinder body 30501, a fine filter inner cylinder 30504 with openings at both the top and bottom ends is fixed in the outer cylinder body 30501, the bottom end of the fine filter inner cylinder 30504 is connected to the top of the first mud delivery pipe 30503, the top opening of the fine filter inner cylinder 30504 forms a water inlet of the fine filter cartridge 305, and a water outlet is provided at the bottom of the outer cylinder body 30501 to form a water outlet of the fine filter cartridge 305. In this way, rainwater runoff enters the fine filter inner cylinder 30504 through the water inlet, and the rainwater runoff obtained after fine filtration in the fine filter inner cylinder 30504 enters the outer cylinder 30501 and is discharged outward through the water outlet, while the sludge in the fine filter inner cylinder 30504 is discharged outward through the first sludge pipe 30503.

[0042] Preferably, if Figure 1 and Figure 5As shown, there are two aerobic purification tanks, which are respectively called the first aerobic purification tank 404 and the second aerobic purification tank 405. The first aerobic purification tank 404 is arranged between the anaerobic purification tank 401 and the second aerobic purification tank 405, and the first aerobic purification tank 404 is connected with the anaerobic purification tank 401 and the second aerobic purification tank 405 through a water pipe with a second valve. A plurality of aeration pipes 403 are arranged in the first aerobic purification tank 404 and the second aerobic purification tank 405, and each aeration pipe 403 is connected to the oxygenation pump 402 through an air supply pipe. The bottom ends of the anaerobic purification tank 401, the first aerobic purification tank 404 and the second aerobic purification tank 405 are connected to a mud discharge pipe 407 with a third valve 406, and the bottom end of each mud discharge pipe 407 is connected to the second mud supply pipe 408. In this way, the anaerobic bacteria in the anaerobic purification tank 401 can perform anaerobically purification treatment on the rainwater runoff after fine filtration. After the anaerobic purification treatment, the second valve on the water pipe between the first aerobic purification tank 404 and the anaerobic purification tank 401 is opened to allow the rainwater runoff to enter the first aerobic purification tank 404. The aerobic bacteria in the first aerobic purification tank 404 can perform primary aerobic purification treatment on the rainwater runoff after anaerobic purification treatment. After the primary aerobic purification treatment, the valve between the first aerobic purification tank 404 and the second aerobic purification tank is opened. The second valve on the water pipe between the anaerobic purification tank 401 and the first aerobic purification tank 404 allows the rainwater runoff to enter the second aerobic purification tank 405. The aerobic bacteria in the second aerobic purification tank 405 can perform secondary aerobic purification on the rainwater runoff after the primary aerobic purification treatment. The organic pollutants in the rainwater runoff can be fully removed by combining the anaerobic purification treatment, the primary aerobic purification treatment and the secondary aerobic purification treatment. The sludge in the anaerobic purification tank 401, the first aerobic purification tank 404 and the second aerobic purification tank 405 is discharged to the outside through the second sludge conveying pipe 408.

[0043] Preferably, if Figure 3 As shown, the first valve 30502 is arranged at the top of the first mud delivery pipe 30503, and a first spiral conveying rod 30506 is arranged in the first mud delivery pipe 30503 below the first valve 30502. The bottom end of the first spiral conveying rod 30506 is connected to the first motor 30508 through the first reducer 30507, and the bottom of the first mud delivery pipe 30503 is connected to the first mud outlet pipe 30509; Figure 5 As shown, a second screw conveying rod 409 is provided in the second mud conveying pipe 408, one end of the second screw conveying rod 409 is connected to a second motor 4011 through a second reducer 4010, and one end of the second mud conveying pipe 408 is connected to a second mud outlet pipe 4012; Figure 4As shown, the bottom of the flocculation tank 301 is connected to the suction pump through the third mud outlet pipe 309. In this way, when it is necessary to clean the sludge, the suction pump is turned on to suck out the sludge at the bottom of the flocculation tank 301 through the third mud outlet pipe 309. By opening the first valve 30502 and turning on the first motor 30508, the first motor 30508 drives the first spiral conveying rod 30506 to rotate through the first reducer 30507, so that the sludge entering the first mud pipe 30503 is discharged outward through the first mud outlet pipe 30509, thereby realizing the discharge of the sludge in the fine filter inner cylinder 30504. By opening each third valve 406 and turning on the second motor 4011, the second motor 4011 drives the second spiral conveying rod 409 to rotate through the second reducer 4010, so that the sludge entering the second mud pipe 408 is discharged outward through the second mud outlet pipe 4012, thereby realizing the discharge of the sludge in the anaerobic purification tank 401, the first aerobic purification tank 404 and the second aerobic purification tank 405.

[0044] In one embodiment, Figure 6 As shown, a disinfectant delivery device 502 is provided above the chemical disinfection tank 501, and a stirrer is provided on both sides of the disinfectant delivery device 502 in the chemical disinfection tank 501. In this way, disinfectant is delivered into the chemical disinfection tank 501 through the disinfectant delivery device 502 to disinfect and sterilize the rainwater runoff entering the chemical disinfection tank 501, wherein the stirrer can fully mix the rainwater runoff in the chemical disinfection tank 501 with the disinfectant, thereby fully disinfecting and sterilizing the rainwater runoff. The stirrer includes a stirring rod 503, and the top of the stirring rod 503 is connected to the third motor 505 through the third reducer 504.

[0045] In the present invention, the oxygen pump 402, the flocculant delivery device 302, the centrifugal pump 303, the first valve 30502, the second valve, the third valve 406, the first motor 30508, the second motor 4011, the suction pump, the disinfectant delivery device 502 and the third motor 505 are all controlled to open or close or open and close by the controller, wherein the controller is a PLC controller. The present invention can control the operation of the physical treatment unit, the biological purification unit and the chemical disinfection unit through the controller to achieve efficient purification of rainwater runoff.

[0046] In the present invention, there are two biological purification units and two chemical disinfection units, the two biological purification units are respectively arranged on both sides of the physical treatment unit, and each biological purification unit is connected to one of the chemical disinfection units.

[0047] A rainwater runoff purification method, using the above-mentioned rainwater runoff purification system for purification, comprises the following steps:

[0048] S1, the rainwater runoff discharged from the end of the rainwater pipe 6 enters the primary filter tank 101 to filter the large particle pollutants in the rainwater runoff, and then the rainwater runoff enters the middle filter tank 201 to filter most of the medium particle pollutants in the rainwater runoff, and then the rainwater runoff enters the buffer tank 202 to filter the remaining medium particle pollutants in the rainwater runoff, and then the rainwater runoff enters the flocculation tank 301 and is flocculated to precipitate the small particle pollutants in the rainwater runoff, and then the rainwater runoff obtained after the precipitation treatment in the flocculation tank 301 is finely filtered by the fine filtration component to remove the micro particle pollutants in the rainwater runoff;

[0049] S2. The rainwater runoff after fine filtration is transported to the anaerobic purification tank 401 through the main outlet pipe 3010. The rainwater runoff is anaerobically purified by the anaerobic bacteria in the anaerobic purification tank 401. The rainwater runoff after anaerobic purification enters the aerobic purification tank. The air is transported to the aeration pipe 403 through the aeration pump 402. The air is discharged into the rainwater runoff in the aerobic purification tank through the aeration pipe 403, so that the aerobic bacteria in the aerobic purification tank are fully in contact with the air, so as to aerobically purify the rainwater runoff.

[0050] S3. The rainwater runoff after aerobic purification treatment enters the chemical disinfection tank 501 for sterilization and disinfection. The rainwater runoff after sterilization and disinfection is discharged into the nearby river and lake water bodies through the drainage pipe.

[0051] In summary, the rainwater runoff purification system in the present invention can fully remove various particulate pollutants in the rainwater runoff before the rainwater runoff is subjected to biological purification treatment. The rainwater runoff purification system in the present invention can fully purify the rainwater runoff discharged from the end of the rainwater pipe 6 to prevent pollution of nearby rivers and lakes.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A rainwater runoff purification system, characterized in that: The invention comprises a physical treatment unit, a biological purification unit and a chemical disinfection unit; the physical treatment unit comprises a primary filter component, a medium filter buffer component and a flocculation fine filter component; the primary filter component comprises a primary filter tank (101); the medium filter buffer component comprises a medium filter tank (201) and a buffer tank (202); the flocculation fine filter component comprises a flocculation tank (301) and a fine filter component; one side of the primary filter tank (101) is connected to the end of a rainwater pipe (6) and the other side is connected to the medium filter tank (201); the medium filter tank (201) is connected to the end of a rainwater pipe (6) through the buffer tank (202); 2) connected to a flocculation tank (301), the fine filtration component is used to finely filter the rainwater runoff obtained after flocculation in the flocculation tank (301); the biological purification unit includes an anaerobic purification tank (401) and an aerobic purification tank, the total outlet pipe (3010) of the fine filtration component is connected to the anaerobic purification tank (401), and the aerobic purification tank is provided with an aeration pipe (403); the chemical disinfection unit includes a chemical disinfection tank (501) connected to the aerobic purification tank, and the drainage pipe of the chemical disinfection tank (501) is connected to a nearby river or lake water body.

2. A rainwater runoff purification system according to claim 1, characterized in that: The middle part of the rear side wall of the primary filter tank (101) is connected to the end of the rainwater pipe (6), and the left and right ends of the front side wall are both provided with a first filter screen plate (102). In the primary filter tank (101), a plurality of second filter screen plates (103) are arranged in sequence from left to right between the front side wall and the rear side wall and between the first filter screen plates (102) on the left and right sides. There are two middle filter tanks (201) and they are distributed on the left and right sides of the buffer tank (202). The primary filter tank (101) is connected to the left middle filter tank (201) through the left first filter screen plate (102), and the primary filter tank (101) is connected to the right middle filter tank (201) through the right first filter screen plate (102). In each middle filter tank (201), a filter screen plate (103) is arranged in the front side wall. A plurality of third filter screen plates (203) are arranged in sequence from left to right between the side wall and the rear side wall and are located between the first filter screen plates (102) on the left and right sides; a fourth filter screen plate (204) is provided on both the left and right walls of the buffer tank (202); the middle filter tank (201) on the left is connected to the buffer tank (202) via the fourth filter screen plate (204) on the left; the middle filter tank (201) on the right is connected to the buffer tank (202) via the fourth filter screen plate (204) on the right; a fifth filter screen plate (205) is provided on the front side wall of the buffer tank (202); the flocculation tank (301) is located at the front end of the buffer tank (202) and is connected to the buffer tank (202) via the fifth filter screen plate (205).

3. A rainwater runoff purification system according to claim 1, characterized in that: A flocculant delivery device (302) is provided above the flocculation tank (301); the fine filter components are multiple and arranged side by side from left to right at corresponding positions of the flocculation tank (301); each of the fine filter components comprises a centrifugal pump (303) arranged in the flocculation tank (301) and a step frame (304) arranged at the front end of the flocculation tank (301); the step frame (304) comprises a first step surface (30401), a second step surface (30402) and a third step surface (30403) whose top heights decrease in sequence; a plurality of fine filter cartridges (305) are provided on the first step surface (30401), the second step surface (30402) and the third step surface (30403); and the first step surface (30401), the second step surface (30402) and the third step surface (30403) are each provided with a plurality of fine filter cartridges (305); The number of fine filter cartridges (305) on the first step surface (30403) is equal, the water outlet of the centrifugal pump (303) is connected to the water inlet of each fine filter cartridge (305) on the first step surface (30401), the water outlet of each fine filter cartridge (305) on the first step surface (30401) is connected to the water inlet of the corresponding fine filter cartridge (305) on the second step surface (30402), the water outlet of each fine filter cartridge (305) on the second step surface (30402) is connected to the water inlet of the corresponding fine filter cartridge (305) on the third step surface (30403), the water outlet of each fine filter cartridge (305) on the third step surface (30403) is connected to the main water outlet pipe (3010) through the corresponding branch water outlet pipe (30505), and the main water outlet pipe (3010) is connected to the anaerobic purification tank (401).

4. A rainwater runoff purification system according to claim 3, characterized in that: There are multiple centrifugal pumps (303) in each fine filtration assembly, and the fine filtration cartridges (305) on the first step surface (30401) are divided into multiple groups according to the number of centrifugal pumps (303), and the number of fine filtration cartridges (305) in each group is equal. The water outlet of each centrifugal pump (303) is connected to the water inlet of a corresponding group of fine filtration cartridges (305) on the first step surface (30401).

5. A rainwater runoff purification system according to claim 4, characterized in that: The water outlet of each centrifugal pump (303) is connected to the water inlet of a corresponding group of fine filter cartridges (305) on the first step surface (30401) via a first connecting pipe (306); the water outlet of each fine filter cartridge (305) on the first step surface (30401) is connected to the water inlet of the corresponding fine filter cartridge (305) on the second step surface (30402) via a second connecting pipe (307); and the water outlet of each fine filter cartridge (305) on the second step surface (30402) is connected to the water inlet of the corresponding fine filter cartridge (305) on the third step surface (30403) via a third connecting pipe (308).

6. A rainwater runoff purification system according to claim 3, characterized in that: The fine filter cartridge (305) comprises an outer cylinder (30501) with an opening at the top, the bottom end of the outer cylinder (30501) is connected to a first mud delivery pipe (30503) with a first valve (30502), the top end of the first mud delivery pipe (30503) is inserted into the bottom of the outer cylinder (30501), a fine filter inner cylinder (30504) with openings at both the top and bottom ends is fixed in the outer cylinder (30501), the bottom end of the fine filter inner cylinder (30504) is connected to the top end of the first mud delivery pipe (30503), the top end opening of the fine filter inner cylinder (30504) forms a water inlet of the fine filter cartridge (305), and a water outlet is provided at the bottom of the outer cylinder (30501) to form a water outlet of the fine filter cartridge (305).

7. A rainwater runoff purification system according to claim 6, characterized in that: The aerobic purification tanks are two and are respectively called a first aerobic purification tank (404) and a second aerobic purification tank (405). The first aerobic purification tank (404) is arranged between the anaerobic purification tank (401) and the second aerobic purification tank (405). The first aerobic purification tank (404) is connected to the anaerobic purification tank (401) and the second aerobic purification tank (405) through a water pipe with a second valve. A plurality of aeration pipes (403) are provided in the first aerobic purification tank (404) and the second aerobic purification tank (405), and each of the aeration pipes (403) is connected to the oxygen pump (402) via an air supply pipe. The bottom ends of the anaerobic purification tank (401), the first aerobic purification tank (404) and the second aerobic purification tank (405) are connected to a mud discharge pipe (407) with a third valve (406), and the bottom ends of each of the mud discharge pipes (407) are connected to the second mud supply pipe (408).

8. A rainwater runoff purification system according to claim 7, characterized in that: The first valve (30502) is arranged at the top of the first mud delivery pipe (30503); a first spiral conveying rod (30506) is arranged in the first mud delivery pipe (30503) below the first valve (30502); the bottom end of the first spiral conveying rod (30506) is connected to the first motor (30508) through a first reducer (30507); the bottom of the first mud delivery pipe (30503) is connected to the first mud outlet pipe (30509); a second spiral conveying rod (409) is arranged in the second mud delivery pipe (408); one end of the second spiral conveying rod (409) is connected to the second motor (4011) through a second reducer (4010); one end of the second mud delivery pipe (408) is connected to the second mud outlet pipe (4012); the bottom of the flocculation tank (301) is connected to the suction pump through a third mud outlet pipe (309).

9. A rainwater runoff purification system according to claim 1, characterized in that: A disinfectant delivery device (502) is provided above the chemical disinfection tank (501), and a stirrer is provided inside the chemical disinfection tank (501).

10. A method for purifying rainwater runoff, using the rainwater runoff purification system according to any one of claims 1 to 9 for purification, characterized in that: The following steps are involved: S1, the rainwater runoff discharged from the end of the rainwater pipe (6) enters the primary filter tank (101) to filter the large particle pollutants in the rainwater runoff, then the rainwater runoff enters the intermediate filter tank (201) to filter most of the medium particle pollutants in the rainwater runoff, then the rainwater runoff enters the buffer tank (202) to filter the remaining medium particle pollutants in the rainwater runoff, then the rainwater runoff enters the flocculation tank (301) and undergoes flocculation treatment to precipitate the small particle pollutants in the rainwater runoff, then the rainwater runoff obtained after the precipitation treatment in the flocculation tank (301) is finely filtered by the fine filtration component to remove the micro particle pollutants in the rainwater runoff; S2, the rainwater runoff after fine filtration is transported to the anaerobic purification tank (401) through the main outlet pipe (3010), and the rainwater runoff is anaerobically purified by the anaerobic bacteria in the anaerobic purification tank (401). The rainwater runoff after anaerobic purification enters the aerobic purification tank, and air is discharged into the rainwater runoff in the aerobic purification tank through the aeration pipe (403), so that the aerobic bacteria in the aerobic purification tank are fully in contact with the air, so as to aerobically purify the rainwater runoff; S3. The rainwater runoff after aerobic purification treatment enters the chemical disinfection tank (501) for sterilization and disinfection. The rainwater runoff after sterilization and disinfection is discharged into nearby rivers and lakes through the drainage pipe.

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