CN111285503A

CN111285503A - Outdoor courtyard rainwater resource recycling integrated system and rainwater purification method

Info

Publication number: CN111285503A
Application number: CN202010225958.6A
Authority: CN
Inventors: 陈伟; 董江朝; 潘增辉
Original assignee: HEBEI PROVINCIAL ACADEMY OF WATER RESOURCES
Current assignee: HEBEI PROVINCIAL ACADEMY OF WATER RESOURCES
Priority date: 2020-03-26
Filing date: 2020-03-26
Publication date: 2020-06-16

Abstract

The invention discloses an outdoor courtyard rainwater resource recycling integrated system and a rainwater purification method, wherein rainwater on a roof is collected by a roof rainwater pipe, and the rainwater enters a rainwater tank after primary rainwater is split by a flow splitting device, so that rainwater collection on the roof is realized; collecting the ground rainwater to the rainwater wetland through the water-permeable concrete pavement, the water-permeable driving surface, the rainwater wetland and the greenbelt to realize the collection of the ground rainwater; after rainwater is collected, sewage interception, filtration and permeation are carried out through a groove type volcanic retention tank of the rainwater wetland, and the rainwater enters a sedimentation tank through a perforated collecting pipe for sedimentation, so that further purification treatment is realized; after the treatment of the sedimentation tank, the sewage enters the PP water storage module box through the flow guide pipe to be stored, the sewage pump and the sewage pump are used for lifting, the separation of clean water and sewage is realized, the sewage is discharged through the sewage pump, the clean water is further purified through the purification all-in-one machine through the water supply pipe, the purification by adding a rainwater purifying agent is not needed, the cyclic utilization of the rainwater is realized, and the water-saving, energy-saving and environment-friendly effects are realized.

Description

Outdoor courtyard rainwater resource recycling integrated system and rainwater purification method

Technical Field

The invention relates to the field of water circulation treatment, in particular to an outdoor courtyard rainwater resource recycling integrated system and a rainwater purification method.

Background

The urban water resource of China is extremely short, and the annual water shortage of cities is about 60 hundred million m³The economic loss caused by water shortage is about 2000 million yuan each year, and the serious water shortage problem directly influences the modernized construction process of cities and towns in China, the increase of GDP and the improvement of the living standard of residents.

The improvement of the cyclic utilization of natural rainwater is an important way for improving the shortage of urban water resources, after the rainwater falls to the ground, about 10 percent of the rainwater forms surface runoff, about 40 percent of the rainwater is consumed in pavement evaporation and depression, and about 50 percent of the rainwater is stored in a soil aeration zone by infiltration or underground water is replenished by a gravity method. In an urban area, due to the influence of buildings and ground linings, the impervious area is increased, namely the urban ground surface is hardened, and channels for water infiltration and groundwater replenishment are cut off, so that the surface runoff is increased, and the soil water content and the underground replenishment quantity are reduced. Due to lack of water supplement and excessive excavation of underground water, the ground subsides, so that the climate is monotonous when the urban area does not fall water, and the ground water accumulation affects the traffic and the life of residents during rainstorm.

In recent years, with the rapid development of socioeconomic performance in China, the living standard of people is continuously improved, and the pursuit of the spiritual civilization is continuously improved while the pursuit of the enjoyment of the substance is pursued. As a basic environment for people to live, a city is developed to the present, construction and planning are far from being limited to providing a better living environment for people, the whole image of the city is represented, water resources of the city are seriously deficient in China, the water consumption of the city is continuously increased, however, the water consumption of a courtyard villa is serious, and the water-saving courtyard landscape design concept needs to be provided because the water-saving and water-storing awareness of owners is relatively thin.

Generally, the rainwater is recycled through the links of collection, filtration, storage, permeation, recycling and the like. The existing rainwater collection system is large in scale and wide in occupied area, is not suitable for courtyard use and popularization, and is relatively large in roof area to enable rainwater collection to be possible in the case of office places and families with courtyards, but the problems of a filtering device, rainwater purification and rainwater storage are not well solved; on the other hand, lawn trees in courtyards have the requirement of irrigation, indoor domestic water also has the requirement, rainwater purification effect is poor without adding a purifying agent, the use of rainwater is directly influenced by adding the purifying agent, and how to reasonably distribute and meet the requirement is also the problem to be solved.

Disclosure of Invention

The invention aims to solve the technical problems and provides an outdoor courtyard rainwater resource recycling integrated system and a rainwater purification method, which are suitable for courtyards, simple in structure, convenient to use, free of adding a rainwater purifying agent, and capable of collecting, intercepting, filtering, storing, permeating, lifting and recycling rainwater.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: outdoor courtyard rainwater resource cyclic utilization integrated system and rainwater purification method, its outdoor courtyard rainwater resource cyclic utilization integrated system includes rainwater jar, rainwater wetland, greenery patches garden, sedimentation tank, PP retaining module case, purifies all-in-one, control system, its characterized in that: the upper part of the rainwater tank is connected with a flow discarding device, the flow discarding device is connected with a roof rainwater pipe, rainwater enters the rainwater tank through the rainwater pipe and the flow discarding device, the lower part of the rainwater tank is connected with a sedimentation tank paved under the ground of the courtyard through a perforated collecting pipe embedded under a rainwater wetland and a greenbelt garden, rainwater enters the sedimentation tank through the perforated collecting pipe after being filtered by the rainwater wetland and the greenbelt garden, the sedimentation tank is connected with a PP water storage module box through a flow guiding pipe, the PP water storage module box arranged under the ground of the courtyard comprises a clean water tank and a sewage tank, a sewage pump is arranged in the sewage tank and connected with a sewage discharge pipe, the sewage discharge pipe extends to the upper part of the ground of the courtyard and is connected with a municipal pipeline, a clean water pump is arranged in the clean water tank and connected with a purification all-in-one machine through, the spray irrigation pipe one end of keeping away from and purifying the all-in-one and be equipped with a plurality of shower nozzles, the feed pipe on be equipped with back flush unit, control system carries out automatic control through the switch board to clean water pump, sewage pump and purification all-in-one.

As an improvement, courtyard ground include the concrete road surface that permeates water, the driving face that permeates water, rainwater wetland and greenery patches, the rainwater wetland is ditch slot type volcanic detains the pond, including grading grit, volcanic filter material, perforation collecting pipe, geomembrane, the perforation collecting pipe is the PVC pipe, the perforation collecting pipe is responsible for, the branch pipe, the person in charge collecting pipe delivery port of perforation collecting pipe links to each other with the sedimentation tank, the person in charge other end and the control flap of perforation collecting pipe link to each other, be responsible for and branch pipe fusion welding link to each other, the bars form is arranged in the volcanic filter material, the geomembrane is spread in ditch slot type volcanic detains the bottom of the pond, volcanic filter material, grading grit and perforation collecting pipe are arranged on the geomembrane.

As an improvement, the diameter of the volcanic filter material particles is 2-4cm, the diameter of the main pipe is phi 110-150mm, the diameter of the branch pipe is phi 50mm, the diameter of the perforation hole is phi 3-5mm, the geomembrane is paved in an inward inclining mode, and the slope of an included angle between a paving surface and a horizontal plane is more than or equal to 5 degrees.

As an improvement, a control valve is arranged on a perforated collecting pipe between the rainwater tank and the sedimentation tank.

As an improvement, an overflow pipe is arranged on the rainwater tank.

As an improvement, the control system comprises a central processing unit, an input interface and module, an output interface and module, control information of the clean water pump and the sewage pump is transmitted into the central processing unit through the input interface and module of the displacement sensor, the central processing unit sends an instruction to the purification all-in-one machine and the backwashing device, the displacement sensor automatically senses the water levels of the clean water tank and the sewage tank and automatically controls the operation of the clean water pump, the sewage pump and the purification all-in-one machine according to the water levels, the displacement sensor is an electrode type liquid level sensor, and the model of the central processing unit is FX2N-48 MR.

The rainwater purification method comprises the following steps:

step 1, collecting roof rainwater and ground rainwater, starting an outdoor courtyard rainwater resource recycling integrated system, automatically finishing primary rainwater discarding in the early stage of raining by using a rainwater discarding device, enabling the roof rainwater to enter a rainwater tank through a rainwater pipe and the rainwater discarding device in the later stage, and opening an overflow valve when the rainwater in the rainwater tank is fully collected to realize roof rainwater collection; collecting the ground rainwater to the rainwater wetland through the water-permeable concrete pavement, the water-permeable driving surface, the rainwater wetland and the greenbelt to realize the collection of the ground rainwater;

step 2, intercepting, filtering, permeating and precipitating the rainwater, collecting the roof rainwater to a rainwater wetland through a control valve and ground rainwater, intercepting and filtering the rainwater through graded sandstone and volcanic filter materials by utilizing a groove type volcanic detention pond structure of the rainwater wetland, and collecting the rainwater to a precipitation pond for purification through permeation of a perforated collecting pipe;

step 3, rainwater is cleaned, separated and stored, rainwater in the sedimentation tank is introduced into the PP water storage module box through the flow guide pipe, and clean water and sewage are separated and stored in a clean water tank and a sewage tank;

step 4, lifting and discharging sewage and purifying and utilizing the clean water, transmitting control information of the clean water pump and the sewage pump into a central processing unit through an input interface and a module of a displacement sensor, sending instructions to the purification all-in-one machine and the backwashing device through the central processing unit, automatically sensing the water levels of the clean water tank and the sewage tank by the displacement sensor, and automatically controlling the operation of the clean water pump, the sewage pump and the purification all-in-one machine according to the water levels; when the water level of the sewage pool rises, the displacement sensor sends an instruction to the control system, the sewage pump starts to work, and sewage is discharged to a municipal pipeline through the sewage discharge pipe; when the water level of the clean water tank rises, the displacement sensor sends an instruction to the control system, the clean water pump starts to work, clean water is lifted through the water supply pipe, the clean water is supplied to the water purification all-in-one machine through the backwashing device, the water purification all-in-one machine starts to work, and the treated clean water is output through the sprinkling irrigation pipe and the spray head, so that cyclic utilization is realized.

The working principle of the invention is as follows: rainwater on the roof is collected by the roof rainwater pipe, and the rainwater enters the rainwater tank after being split by the flow splitting device, so that the rainwater collection on the roof is realized; collecting the ground rainwater to the rainwater wetland through the water-permeable concrete pavement, the water-permeable driving surface, the rainwater wetland and the greenbelt to realize the collection of the ground rainwater; after rainwater is collected, sewage interception, filtration and permeation are carried out through a groove type volcanic retention tank of the rainwater wetland, and the rainwater enters a sedimentation tank through a perforated collecting pipe for sedimentation, so that further purification treatment is realized; after the treatment of the sedimentation tank, the sewage enters the PP water storage module box through the flow guide pipe to be stored, the sewage pump and the sewage pump are used for lifting, the separation of clean water and sewage is realized, the sewage is discharged through the sewage pump, the clean water is further purified through the purification all-in-one machine through the water supply pipe, the purification of a rainwater purifying agent is not needed, and the cyclic utilization of the rainwater is realized.

Compared with the prior art, the invention has the advantages that:

1. the rainwater resource recycling integrated system and the rainwater purification method for the outdoor courtyard, provided by the invention, have the advantages that the purification by using a rainwater purifying agent is not needed, the recycling of rainwater can be realized, the water and energy are saved, the environment is protected, the system is integrated, and the installation and the use are convenient;

2. the system can be used for collecting, treating, lifting, discharging and utilizing rainwater, and can also be used for discharging and utilizing wastewater similar to rainwater quality.

3. Aiming at the problems of improvement of urban hardening rate and aggravation of rainwater runoff pollution, the system utilizes the rainwater wetland to treat pollutants generated by the asphalt roof, and the subsurface flow wetland provided with ceramsite and volcanic rock has higher pollutant removal rate compared with the natural soil wetland, and is detected through a comparison experiment: the hydraulic retention time of the system is 48h, and the hydraulic load is 0.03m³/m²D, the stabilized constructed wetland has ideal pollutant removal effect, the average turbidity removal rate of the system effluent is 78.79%, the average TN removal rate of the effluent is 56.38%, the average NH3-N removal rate of the effluent is 82.19%, the average CODmn removal rate of the effluent is 76.39%, and the average TP removal rate of the effluent is 87.95%. The water quality after treatment can reach the IV-class water quality standard of the surface water discharge requirement in the environmental quality standard of surface water (GB 3838-2002).

Drawings

Fig. 1 is a schematic structural diagram of an outdoor courtyard rainwater resource recycling integrated system of the present invention.

FIG. 2 is a schematic view of the structure of the rainwater wetland

FIG. 3 is a schematic view of the sectional structure of the rainwater wetland

FIG. 4 is a schematic plane layout of the rain wetland

FIG. 5 is a schematic diagram of a control system of the present invention

As shown in the figure: 1. the system comprises a purification all-in-one machine, 2, a sedimentation tank, 3, a perforated collecting pipe, 4, a rainwater tank, 5, a rainwater wetland, 6, a pp water storage module box, 7, a clean water tank, 8, a sewage tank, 9, a guide pipe, 10, a sewage pump, 11, a blow-off pipe, 12, a clean water pump, 13, a water supply pipe, 14, a spray irrigation pipe, 15, a spray head, 16, a back washing device, 17, a control valve, 18, a flow abandoning device, 19, a control cabinet, 20, a control circuit, 21 an overflow pipe, 22, a roof rainwater pipe, 23 volcanic rock filter materials, 24 geomembrane, 25-grade sand, 26 collecting pipe water outlets, 27 main pipes, 28 branch pipes and 29 slope angles.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1-4, the rainwater resource recycling integrated system for the outdoor courtyard comprises a rainwater tank 4, a rainwater wetland 5, a greenbelt garden, a sedimentation tank 2, a PP water storage module box 6, a purification all-in-one machine 1 and a control system, and is characterized in that: the rainwater tank 4 is connected with a flow abandoning device 18 above, the flow abandoning device 18 is connected with a roof rainwater pipe 22, rainwater enters the rainwater tank 4 through the rainwater pipe 22 and the flow abandoning device 18, the lower part of the rainwater tank 4 is connected with a sedimentation tank 2 paved under the courtyard ground through a perforated collecting pipe 3 buried under a rainwater wetland 5 and a greenfield garden, rainwater enters the sedimentation tank 2 through the perforated collecting pipe 3 after being filtered by the rainwater wetland 5 and the greenfield garden, the sedimentation tank 2 is connected with a PP water storage module box 6 through a guide pipe 9, the PP water storage module box 6 arranged under the courtyard ground comprises a clean water tank 7 and a sewage tank 8, a sewage pump 10 is arranged in the sewage tank 8, the sewage pump 10 is connected with a sewage discharge pipe 11, the sewage discharge pipe 11 extends to the upper part of the courtyard ground to be connected with a municipal pipeline, a clean water pump 12 is arranged in the clean water tank 7, the clean water pump 12 is connected with a, the water purification all-in-one machine 1 connect sprinkling irrigation pipe 14, the sprinkling irrigation pipe 14 one end of keeping away from purification all-in-one machine 1 be equipped with a plurality of shower nozzles 15, feed pipe 13 on be equipped with back flush unit 16, control system carries out automatic control through switch board 19 to clean water pump 12, sewage pump 10 and purification all-in-one machine 1.

As an improvement, the courtyard ground includes the concrete road surface that permeates water, the driving face that permeates water, rainwater wetland 5 and greenery patches, rainwater wetland 5 is ditch slot type volcanic detains the pond, including level 25 volcanic filter materials 23, perforation collecting pipe 3, geomembrane 24 of sand and stone, perforation collecting pipe 3 is the PVC pipe, perforation collecting pipe 3 is including being responsible for 27, branch pipe 28, perforation collecting pipe 3's the main pipe 27 collecting pipe delivery port 26 that is responsible for links to each other with sedimentation tank 2, perforation collecting pipe 3's the main pipe 27 other end that is responsible for links to each other with control valve 17, be responsible for 27 and branch pipe 28 fusion welding and link to each other, the bars form is arranged in volcanic filter materials 23, geomembrane 24 is spread in ditch slot type volcanic detains the bottom of the pond, level mix grit 25, volcanic filter materials 23 and perforation collecting pipe 3 and arrange on.

As an improvement, the diameter of the volcanic filter material 23 is 2-4cm, the diameter of the main pipe 27 is phi 110-150mm, the diameter of the branch pipe 28 is phi 50mm, the diameter of the perforation hole is phi 3-5mm, the geomembrane 24 is paved in an inward inclining mode, and the slope 29 of the included angle between a paving surface and a horizontal plane is larger than or equal to 5 degrees.

As a modification, a control valve 17 is arranged on the perforated collecting pipe 3 positioned between the rainwater tank 4 and the sedimentation tank 2.

As an improvement, an overflow pipe 21 is arranged on the rainwater tank 4.

As shown in fig. 5, the control system includes a central processing unit, an input interface and module, and an output interface and module, the control information of the clean water pump 12 and the sewage pump 10 is transmitted to the central processing unit through the input interface and module of the displacement sensor, and the central processing unit sends instructions to the integrated purification machine 1 and the backwashing device 16, the displacement sensor automatically senses the water levels of the clean water tank 7 and the sewage tank 8, and automatically controls the operation of the clean water pump 12, the sewage pump 10 and the integrated purification machine 1 according to the water levels, the displacement sensor is an electrode type liquid level sensor, and the model of the central processing unit is FX2N-48 MR.

The rainwater purification method comprises the following steps:

step 1, collecting roof rainwater and ground rainwater, starting an outdoor courtyard rainwater resource recycling integrated system, automatically finishing primary rainwater discarding in the early stage of raining by using a rainwater discarding device 18, and enabling the roof rainwater to enter a rainwater tank 4 through a rainwater pipe 22 and the rainwater discarding device 18 in the later stage to realize roof rainwater collection, wherein when the rainwater tank 4 is full of rainwater, an overflow valve 21 is opened to overflow; the ground rainwater is collected to the rainwater wetland 5 through the pervious concrete pavement, the pervious driving surface, the rainwater wetland 5 and the green land, so that the ground rainwater is collected;

step 2, intercepting, filtering, permeating and precipitating the rainwater, collecting the roof rainwater to the rainwater wetland 5 through the control valve 17 and the ground rainwater, intercepting and filtering the rainwater through graded sandstone 25 and volcanic filter material 23 by utilizing a groove type volcanic detention pond structure of the rainwater wetland 5, and collecting the rainwater to the precipitation pond 2 for purification through permeation of a perforated collecting pipe 3;

step 3, rainwater is cleaned, separated and stored, rainwater in the sedimentation tank 2 is introduced into a PP water storage module box 6 through a flow guide pipe 9, and clean water and sewage are separated and stored in a clean water tank 7 and a sewage tank 8;

step 4, lifting and discharging sewage and purifying clean water, transmitting control information of the clean water pump 12 and the sewage pump 10 into a central processing unit through an input interface and a module of a displacement sensor, sending instructions to the purifying integrated machine 1 and the backwashing device 16 through the central processing unit, automatically sensing the water levels of the clean water tank 7 and the sewage tank 8 by the displacement sensor, and automatically controlling the operation of the clean water pump 12, the sewage pump 10 and the purifying integrated machine 1 according to the water levels; when the water level of the sewage pool 8 rises, the displacement sensor sends an instruction to the control system, the sewage pump 10 starts to work, sewage is discharged through the sewage discharge pipe 11 and is discharged to a municipal pipeline; when the water level of the clean water tank 7 rises, the displacement sensor sends an instruction to the control system, the clean water pump 12 starts to work, clean water is lifted through the water supply pipe 13, the clean water is supplied to the water purification all-in-one machine 1 through the backwashing device 16, the water purification all-in-one machine 1 starts to work, and the treated clean water is output through the sprinkling irrigation pipe 14 and the spray nozzle 15, so that the cyclic utilization is realized.

The working principle of the invention is as follows: utilize roof downspout 3 to collect the rainwater on the roof, in abandoning class device 18 preliminary purification back entering rainwater jar 4, then in the perforation collecting pipe 3 enters sedimentation tank 2, the rainwater on courtyard ground also enters sedimentation tank 2 through perforation collecting pipe 3, courtyard ground includes the concrete road surface that permeates water, the driving face that permeates water, rainwater wetland and greenery patches, the water in sedimentation tank 2 enters into clean water basin 7 through honeycomb duct 9, honeycomb duct 9 is higher than the liquid level height of clean water basin 7, the water in clean water basin 7 is sent to purification all-in-one 1 through clean water pump 12 and feed pipe 13, the water after purification all-in-one 1 irrigates the green planting in the courtyard through sprinkling irrigation pipe 14 and shower nozzle 15, the water in sewage basin 8 passes through sewage pump 10, blow off pipe 11 discharges to in the municipal administration pipeline.

Aiming at the problems of improvement of urban hardening rate and aggravation of runoff pollution of rainwater, pollutants generated by an asphalt roof are treated by using a rainwater wetland, the subsurface wetland provided with ceramsite and volcanic rock has higher pollutant removal rate compared with a natural soil wetland, and the rainwater treated by the system is detected by a comparison experiment: the hydraulic retention time of the system is 48h, the stabilized constructed wetland has ideal pollutant removal effect under the condition that the hydraulic load is 0.03m3/m 2. d, the average turbidity removal rate of the effluent of the system is 78.79%, the average TN removal rate of the effluent is 56.38%, the average NH3-N removal rate of the effluent is 82.19%, the average CODmn removal rate of the effluent is 76.39%, and the average TP removal rate of the effluent is 87.95%. The water quality after treatment can reach the IV-class water quality standard of the surface water discharge requirement in the environmental quality standard of surface water (GB 3838-2002).

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. Outdoor courtyard rainwater resource cyclic utilization integrated system and rainwater purification method, its outdoor courtyard rainwater resource cyclic utilization integrated system include rainwater jar (4), rainwater wetland (5), greenery patches garden, sedimentation tank (2), PP retaining module case (6), purify all-in-one (1), control system, its characterized in that: the rainwater tank (4) is connected with a flow abandoning device (18) above, the flow abandoning device (18) is connected with a roof rainwater pipe (22), rainwater enters the rainwater tank (4) through the rainwater pipe (22) and the flow abandoning device (18), the lower part of the rainwater tank (4) is connected with a sedimentation tank (2) paved under the ground of the courtyard through a perforated collecting pipe (3) embedded under a rainwater wetland (5) and a greenbelt garden, the rainwater is filtered through the rainwater wetland (5) and the greenbelt garden and enters the sedimentation tank (2) through the perforated collecting pipe (3), the sedimentation tank (2) is connected with a PP water storage module box (6) through a flow guide pipe (9), the PP water storage module box (6) arranged under the ground of the courtyard comprises a clean water tank (7) and a sewage tank (8), a pump (10) is arranged in the sewage tank (8), and the sewage pump (10) is connected with a sewage discharge pipe (11, blow off pipe (11) extend to courtyard ground top and connect the municipal administration pipeline, clean water basin (7) in be equipped with clean water pump (12), clean water pump (12) connect through feed pipe (13) and purify all-in-one (1), clean water all-in-one (1) connect sprinkling irrigation pipe (14), sprinkling irrigation pipe (14) keep away from the one end of purifying all-in-one (1) and be equipped with a plurality of shower nozzles (15), feed pipe (13) on be equipped with back washing unit (16), control system carries out automatic control through switch board (19) to clean water pump (12), sewage pump (10) and purification all-in-one (1).

2. The integrated outdoor courtyard rainwater resource recycling system and the rainwater purification method according to claim 1, wherein: the courtyard ground comprises a water-permeable concrete pavement, a water-permeable traveling surface, a rainwater wetland (5) and a green land, the rainwater wetland (5) is a groove type volcanic retention pool, which comprises graded sandstone (25), volcanic filter material (23), a perforated collecting pipe (3) and a geomembrane (24), the perforated collecting pipe (3) is a PVC pipe, the perforated collecting pipe (3) comprises a main pipe (27) and branch pipes (28), a main pipe (27) of the perforated collecting pipe (3) and a collecting pipe water outlet (26) are connected with the sedimentation tank (2), the other end of the main pipe (27) of the perforated collecting pipe (3) is connected with a control valve (17), the main pipe (27) is connected with the branch pipe (28) by fusion welding and is arranged in the volcanic filter material (23) in a grid shape, the geomembrane (24) is paved at the bottom of the groove type volcanic retention pond, and the graded sandstone (25), the volcanic filter material (23) and the perforated collecting pipe (3) are arranged on the geomembrane (24).

3. The integrated system for recycling rainwater resources in outdoor courtyards and the rainwater purification method according to claims 1 and 2, are characterized in that: the diameter of the volcanic filter material (23) particles is 2-4cm, the diameter of the main pipe (27) is phi 110-150mm, the diameter of the branch pipe (28) is phi 50mm, the diameter of the perforation hole is phi 3-5mm, the geomembrane (24) is paved in an inward inclining mode, and the included angle gradient (29) between a paving surface and a horizontal plane is more than or equal to 5 degrees.

4. The integrated outdoor courtyard rainwater resource recycling system and the rainwater purification method according to claim 1, wherein: a control valve (17) is arranged on the perforated collecting pipe (3) between the rainwater tank (4) and the sedimentation tank (2).

5. The integrated outdoor courtyard rainwater resource recycling system and the rainwater purification method according to claim 1, wherein: an overflow pipe (21) is arranged on the rainwater tank (4).

6. The integrated outdoor courtyard rainwater resource recycling system and the rainwater purification method according to claim 1, wherein: the control system comprises a central processing unit, an input interface and module, an output interface and module, control information of the clean water pump (12) and the sewage pump (10) is transmitted into the central processing unit through the input interface and module of the displacement sensor, and the central processing unit sends instructions to the purification all-in-one machine 1 and the backwashing device (16), the displacement sensor automatically senses the water levels of the clean water tank (7) and the sewage tank (8), and automatically controls the operation of the clean water pump (12), the sewage pump (10) and the purification all-in-one machine (1) according to the water levels, the displacement sensor is an electrode type liquid level sensor, and the model of the central processing unit is FX2N-48 MR.

7. The integrated outdoor courtyard rainwater resource recycling system and the rainwater purification method according to claim 1, wherein: the rainwater purification method comprises the following steps:

step 1, collecting roof rainwater and ground rainwater, starting an outdoor courtyard rainwater resource recycling integrated system, automatically finishing primary rainwater discarding in the early stage of raining by using a rainwater discarding device 18, and enabling the roof rainwater to enter a rainwater tank 4 through a rainwater pipe 22 and the rainwater discarding device 18 in the later stage to realize roof rainwater collection, wherein when the rainwater tank 4 is full of rainwater, an overflow valve 21 is opened to overflow; the ground rainwater is collected to the rainwater wetland 5 through the pervious concrete curbs, the pervious traversers, the rainwater wetland 5 and the greenbelt, so that the ground rainwater is collected;