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

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 integrated system for recycling and utilization of rainwater resources in outdoor courtyards and a method for purifying rainwater.

Background technique

China's urban water resources are extremely scarce. The annual water shortage in cities is about 6 billion m ³ , and the annual economic loss due to water shortage is about 200 billion yuan. The serious water shortage directly affects the process of urban modernization in China, the growth of GDP and the life of residents. level of improvement.

Improving the recycling of natural rainwater is an important way to improve the lack of urban water resources. After rainwater falls on the ground, about 10% of it will constitute surface runoff, about 40% will be consumed by road evaporation and swales, and about 50% will be stored in the groundwater table through infiltration. In the vadose zone of soil, or recharge groundwater by gravity methods. In urbanized areas, due to the influence of buildings and ground linings, the impervious area increases, that is, "urban surface hardening", which cuts off the channels for water infiltration and groundwater recharge, resulting in increased surface runoff, soil moisture content and underground recharge. amount decreased. Due to the lack of water supply and the excessive excavation of groundwater, the land subsides, the climate in urban areas is monotonous when there is no precipitation, and the ground is flooded when there is heavy rain, affecting traffic and residents' lives.

In recent years, with the rapid development of my country's social economy, people's material living standards have been continuously improved. While pursuing material enjoyment, they have also continuously improved their pursuit of spiritual civilization. As the basic environment for people's life, cities have developed so far, and construction and planning are far from being limited to providing people with a better living environment, but also representing the overall image of a city. However, the waste of water in courtyard villas is serious, and the owners have little awareness of water saving and water storage, so it is necessary to propose a water-saving courtyard landscape design concept.

Usually, the recycling of rainwater consists of collection, filtration, storage, infiltration, and reuse. At present, the existing rainwater collection system is often large in scale and covers a wide area, which is not suitable for the promotion of courtyard use. For offices and families with courtyards, on the one hand, the roof area is relatively large, which makes rainwater collection possible, but The problems of filtration devices, rainwater purification, and rainwater storage have not been well resolved; on the other hand, lawns and trees in the courtyard have needs for irrigation, and indoor domestic water also needs to be used. The use of rainwater, how to reasonably distribute and meet the above needs is also a problem that needs to be solved.

SUMMARY OF THE INVENTION

The present invention aims to solve the above technical problems, and provides an outdoor courtyard suitable for courtyards with simple structure, convenient use, no need to add rainwater purifiers, and with rainwater collection, sewage interception, filtration, storage, infiltration, promotion and reuse. Rainwater resource recycling integrated system and rainwater purification method.

In order to solve the above technical problems, the technical solution provided by the present invention is: an integrated system for recycling and utilization of rainwater resources in outdoor courtyards and a method for purifying rainwater. The water storage module box, the integrated purification machine and the control system are characterized in that: a flow rejection device is connected above the rainwater tank, the flow rejection device is connected to the roof rainwater pipe, and the rainwater enters the rainwater tank through the rainwater pipe and the flow rejection device. The bottom of the rainwater tank is connected to the sedimentation tank laid under the ground of the courtyard through the perforated collection pipe buried under the rainwater wetland and the green garden. The pipe is connected to the PP water storage module box. The PP water storage module box located under the ground of the courtyard includes a clean water pool and a sewage pool. The sewage pool is provided with a sewage pump, and the sewage pump is connected to the sewage pipe. The sewage pipe extends to the top of the courtyard and is connected to the municipal pipeline. The clean water pool is provided with a clean water pump. The clean water pump is connected to the integrated purification machine through the water supply pipe. The integrated water purification machine is connected to the sprinkler irrigation pipe. The sprinkler irrigation The end of the pipe away from the integrated purification machine is provided with a plurality of nozzles, the water supply pipe is provided with a backwashing device, and the control system automatically controls the clean water pump, the sewage pump and the integrated purification machine through the control cabinet.

As an improvement, the courtyard ground includes permeable concrete pavement, permeable road surface, rainwater wetland and green space, and the rainwater wetland is a grooved volcanic rock retention pond, including graded sand and gravel, volcanic rock filter material, perforated collection pipe, geomembrane , the perforated collection pipe is a PVC pipe, the perforated collection pipe includes a main pipe and a branch pipe, the water outlet of the main pipe of the perforated collection pipe is connected with the sedimentation tank, and the other end of the main pipe of the perforated collection pipe is connected with the control valve, The main pipe is connected to the branch pipe by fusion welding, and is arranged in a grid-like filter material in the volcanic rock. The geomembrane is laid on the bottom of the grooved volcanic rock retention pool. .

As an improvement, the particle diameter of the volcanic rock filter material is 2-4cm, the diameter of the main pipe is Ф110-150mm, the diameter of the branch pipe is Ф50mm, the diameter of the perforation hole is Ф3-5mm, and the geomembrane is inwardly inclined pavement , the slope of the angle between the pavement surface and the horizontal surface is ≥5°.

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

As an improvement, the rainwater tank is provided with an overflow pipe.

As an improvement, the control system includes a central processing unit, an input interface and module, an output interface and a module, and the control information of the clean water pump and the sewage pump is transmitted to the central processing unit through the input interface and module of the displacement sensor, and is processed by the central processing unit. The displacement sensor automatically senses the water level of the clean water pool and the sewage pool, and automatically controls the work of the clean water pump, the sewage pump and the all-in-one purification machine according to the level of the water level. The displacement sensor is an electrode Type liquid level sensor, the model of the central processing unit is FX2N-48MR.

Its rainwater purification method includes the following steps:

Step 1: Collect the rainwater on the roof and the ground, and open the integrated system for recycling and utilization of rainwater resources in the outdoor courtyard. At the beginning of the rain, the flow abandonment device works to automatically complete the first rainwater abandonment. In the later stage, the roof rainwater enters the rainwater tank through the rainwater pipe and the flow abandonment device. When the rainwater in the rainwater tank is full, the overflow valve is opened to realize the collection of rainwater on the roof; the ground rainwater is collected to the rainwater wetland through the permeable concrete pavement, the permeable driving surface, the rainwater wetland and the green space to realize the ground rainwater collection;

Step 2: Rainwater interception, filtration, infiltration and precipitation purification. The roof rainwater is collected into the rainwater wetland through the control valve and ground rainwater, and the grooved volcanic rock retention pond structure of the rainwater wetland is used. The rainwater is filtered by graded sand and volcanic rock. The material is intercepted and filtered, and then permeated through the perforated collection tube and merged into the sedimentation tank for purification;

Step 3, the rainwater is cleaned and stored separately, the rainwater in the sedimentation tank is introduced into the PP water storage module box through the diversion pipe, and the clean water and sewage are separated and stored in the clean water tank and the sewage tank;

Step 4: The sewage is lifted and discharged and the clean water is purified and utilized. The control information of the clean water pump and the sewage pump 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 and the backwashing device, and the displacement is carried out. The sensor automatically senses the water level of the clean water pool and the sewage pool, and automatically controls the work of the clean water pump, the sewage pump and the integrated purification machine according to the water level; The pipe discharges the sewage to the municipal pipeline; when the water level of the clean water pool rises, the displacement sensor sends an instruction to the control system, the clean water pump starts to work, and the clean water is lifted through the water supply pipe, and the clean water is supplied to the water purifier through the backwash device. The machine starts to work, and the treated purified water is outputted through the sprinkler irrigation pipe and sprinkler head to realize recycling.

The working principle of the invention is as follows: the rainwater on the roof is collected by the roof rainwater pipe, and the first rainwater is diverted into the rainwater tank through the abandonment device, so as to realize the collection of rainwater on the roof; Wetlands and green spaces are collected into rainwater wetlands to collect rainwater on the ground; after rainwater is collected, it is intercepted, filtered, and infiltrated through the grooved volcanic rock retention pond in the rainwater wetlands, and then enters the sedimentation tank through perforated collection pipes for precipitation to achieve further purification. ;After treatment in the sedimentation tank, it enters the PP water storage module box through the diversion pipe for storage, and uses the clean water pump and sewage pump for lifting to realize the separation of clean water and sewage. The sewage is discharged through the sewage pump, and the clean water passes through the water supply pipe. Purification, without rainwater purifier purification, to achieve the recycling of rainwater.

The advantages of the present invention compared with the prior art are:

1. The outdoor courtyard rainwater resource recycling integrated system and rainwater purification method provided by the present invention do not require rainwater purifier purification, can realize the recycling of rainwater, save water, save energy, and be environmentally friendly, and are integrated and integrated, and are easy to install and use;

2. The system can be used not only for the collection, treatment, improvement, discharge and utilization of rainwater, but also for wastewater discharge and utilization similar to the quality of rainwater.

3. Aiming at the problem of increasing urban hardening rate and aggravating rainwater runoff pollution, the system uses rainwater wetlands to treat pollutants generated by asphalt roofs. The subsurface wetlands equipped with ceramsite and volcanic rocks have higher pollutant removal rates than natural soil wetlands. By comparing Experimental detection: the hydraulic retention time of the system is 48h, and under the condition of hydraulic load of 0.03m ³ /m ² ·d, the stabilized constructed wetland has an ideal removal effect on pollutants. The average removal rate of system effluent turbidity is 78.79%, and the effluent TN The average removal rate is 56.38%, the average removal rate of NH3-N in effluent is 82.19%, the average removal rate of CODmn in effluent is 76.39%, and the average removal rate of TP in effluent is 87.95%. The water quality after treatment can meet the Class IV water quality standard required for surface water discharge in "Environmental Quality Standard for Surface Water" (GB3838-2002).

Description of drawings

FIG. 1 is a schematic structural diagram of an integrated system for recycling and utilization of rainwater resources in outdoor courtyards of the present invention.

Figure 2 is a schematic diagram of the rainwater wetland structure of the present invention

3 is a schematic diagram of the cross-sectional structure of the rainwater wetland of the present invention

Figure 4 is a schematic diagram of the layout of the rainwater wetland of the present invention

Fig. 5 is the principle diagram of the control system of the present invention

As shown in the picture: 1. Purification integrated machine, 2. Sedimentation tank, 3. Perforated collection pipe, 4. Rainwater tank, 5. Rainwater wetland, 6. PP water storage module box, 7. Clear water tank, 8. Sewage tank, 9. Diversion pipe, 10, Sewage pump, 11, Sewage pipe, 12, Clean water pump, 13, Water supply pipe, 14, Sprinkler irrigation pipe, 15, Nozzle, 16, Backwash device, 17, Control valve, 18, Discarded flow Device, 19, control cabinet, 20, control circuit, 21 overflow pipe, 22, roof rainwater pipe, 23 volcanic rock filter material, 24 geomembrane, 25 graded sand and gravel, 26 collection pipe outlet, 27 main pipe, 28 branch pipe, 29 slope angle.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1-4, the integrated system of outdoor courtyard rainwater resource recycling includes rainwater tank 4, rainwater wetland 5, green garden, sedimentation tank 2, PP water storage module box 6, purification integrated machine 1, and a control system. It is: the above the rainwater tank 4 is connected with a flow rejection device 18, the flow rejection device 18 is connected to the roof rainwater pipe 22, the rainwater enters the rainwater tank 4 through the rainwater pipe 22 and the flow rejection device 18, and the rainwater tank 4 is buried under the rainwater tank 4. The rainwater wetland 5 and the perforated collection pipe 3 under the green space garden are connected to the sedimentation tank 2 laid under the ground of the courtyard. The rainwater is filtered through the rainwater wetland 5 and the green space garden and enters the sedimentation tank 2 through the perforated collection pipe 3. The flow pipe 9 is connected with the PP water storage module box 6. The PP water storage module box 6 located under the ground of the courtyard includes a clean water pool 7 and a sewage pool 8. The sewage pool 8 is provided with a sewage pump 10. The sewage pump 10 is connected to the sewage pipe 11, and the sewage pipe 11 extends to the top of the courtyard to connect to the municipal pipeline. Machine 1, the water purification integrated machine 1 is connected to a sprinkler irrigation pipe 14, the end of the sprinkler irrigation pipe 14 away from the purification integrated machine 1 is provided with a plurality of nozzles 15, the water supply pipe 13 is provided with a backwash device 16, The control system automatically controls the clean water pump 12 , the sewage pump 10 and the integrated purification machine 1 through the control cabinet 19 .

As an improvement, the courtyard ground includes permeable concrete pavement, permeable driving surface, rainwater wetland 5 and green space, and the rainwater wetland 5 is a grooved volcanic rock retention pond, including graded sandstone 25 volcanic rock filter material 23, perforated collection pipe 3. Geomembrane 24, the perforated collection pipe 3 is a PVC pipe, the perforated collection pipe 3 includes a main pipe 27 and a branch pipe 28, and the main pipe 27 of the perforated collection pipe 3 is connected with the collection pipe outlet 26 of the sedimentation tank 2, so The other end of the main pipe 27 of the perforated collection pipe 3 is connected to the control valve 17, the main pipe 27 is connected to the branch pipe 28 by fusion welding, the grid is arranged in the volcanic rock filter material 23, and the geomembrane 24 is spread in the grooved volcanic rock retention pond. At the bottom, the graded sand 25 , the volcanic rock filter material 23 and the perforated collection pipe 3 are arranged on the geomembrane 24 .

As an improvement, the particle diameter of the volcanic rock filter material 23 is 2-4cm, the diameter of the main pipe 27 is Ф110-150mm, the diameter of the branch pipe 28 is Ф50mm, the diameter of the perforated hole is Ф3-5mm, and the geomembrane 24 is Inwardly inclined pavement, the angle between the pavement surface and the horizontal surface is 29 ≥ 5°.

As an improvement, a control valve 17 is provided on the perforated collection pipe 3 between the rainwater tank 4 and the sedimentation tank 2 .

As an improvement, the rainwater tank 4 is provided with an overflow pipe 21 .

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

Its rainwater purification method includes the following steps:

Step 1, the roof rainwater and ground rainwater are collected, and the integrated system for recycling and utilization of rainwater resources in the outdoor courtyard is opened. In the early stage of rain, the abandonment device 18 works to automatically complete the first rainwater abandonment, and the rainwater on the roof passes through the rainwater pipe 22 and the abandonment device 18 in the later stage. Enter the rainwater tank 4 to realize the collection of rainwater on the roof. When the rainwater in the rainwater tank 4 is full, the overflow valve 21 is opened to overflow; the ground rainwater is collected to the rainwater wetland 5 through the permeable concrete road, the permeable driving surface, the rainwater wetland 5 and the green space, Realize ground rainwater collection;

Step 2, rainwater interception, filtration, infiltration and precipitation purification, the roof rainwater is collected into the rainwater wetland 5 through the control valve 17 and ground rainwater, and the grooved volcanic rock retention pond structure of the rainwater wetland 5 is used, and the rainwater is graded sand and gravel. 25. The volcanic rock filter material 23 is intercepted and filtered, and then infiltrated through the perforated collection tube 3, and then merged into the sedimentation tank 2 for purification;

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

In step 4, the sewage is lifted and discharged and the clean water is purified and utilized. 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 is used to purify the integrated machine 1 and the backwash device 16. Send an instruction, the displacement sensor automatically senses the water level of the clean water pool 7 and the sewage pool 8, and automatically controls the work of the clean water pump 12, the sewage pump 10 and the integrated purification machine 1 according to the level of the water level; when the water level of the sewage pool 8 rises, the displacement sensor sends the control system When the command is issued, the sewage pump 10 starts to work, and the sewage is discharged through the sewage pipe 11 to the 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, and the clean water is lifted through the water supply pipe 13. , clean water is supplied to the integrated water purification machine 1 through the backwashing device 16, the integrated water purification machine 1 starts to work, and the treated purified water is outputted through the sprinkler irrigation pipe 14 and the sprinkler head 15 to realize recycling.

The working principle of the present invention: the rainwater on the roof is collected by the roof rainwater pipe 3, enters the rainwater tank 4 after preliminary purification by the waste flow device 18, and then enters the sedimentation tank 2 through the perforated collection pipe 3, and the rainwater on the courtyard ground is also It enters the sedimentation tank 2 through the perforated collection pipe 3. The courtyard ground includes permeable concrete pavement, permeable driving surface, rainwater wetland and green space. The water in the sedimentation tank 2 enters the clear water tank 7 through the guide pipe 9. The guide pipe 9 Higher than the liquid level of the clean water pool 7, the water in the clean water pool 7 is sent to the integrated purification machine 1 through the clean water pump 12 and the water supply pipe 13. The green plants inside are irrigated, and the water in the sewage pool 8 is discharged into the municipal pipeline through the sewage pump 10 and the sewage pipe 11 .

In view of the increase of urban hardening rate and the aggravation of rainwater runoff pollution, rainwater wetlands are used to treat pollutants generated by asphalt roofs. Underflow wetlands equipped with ceramsite and volcanic rocks have a higher pollutant removal rate than natural soil wetlands. The systematic treatment of rainwater has undergone comparative experiments. Detection: The hydraulic retention time of the system is 48h. Under the condition of hydraulic load of 0.03m3/m2·d, the stabilized constructed wetland has an ideal removal effect on pollutants. The average removal rate of system effluent turbidity is 78.79%, and the average removal rate of TN in effluent is 78.79%. The average removal rate of NH3-N in effluent is 82.19%, the average removal rate of CODmn in effluent is 76.39%, and the average removal rate of TP in effluent is 87.95%. The water quality after treatment can meet the Class IV water quality standard required for surface water discharge in the "Environmental Quality Standard for Surface Water" (GB3838-2002).

The present invention and its embodiments have been described above, and the description is not restrictive, and what is shown in the accompanying drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. All in all, if those of ordinary skill in the art are inspired by it, and without departing from the purpose of the present invention, any structural modes and embodiments similar to this technical solution are designed without creativity, all should belong to the protection scope of the present invention.

Claims (7)

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;

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.

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