A sponge city rainwater collection, infiltration and recharge system

Abstract

The application belongs to the technical field of sponge city rainwater utilization, and particularly relates to a sponge city rainwater collection, storage, infiltration and recharge system. The system comprises a rainwater collection system, a rainwater storage and reuse system, a slow flow control system, a rainwater purification system and a dual irrigation and pumping and monitoring system. The system fully realizes rainwater resource utilization, can maximize the collection and utilization of rainwater during rainfall, can effectively relieve urban waterlogging pressure during heavy rain, can compensate for the influence of project construction on the reduction of groundwater infiltration recharge, and improves the rainwater resource utilization efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sponge city rainwater utilization, and particularly relates to a sponge city rainwater collection, storage, infiltration and recharge system. BACKGROUND

[0002] A sponge city is a new type of urban construction concept and an important part of green development and ecological civilization construction. With the acceleration of urbanization, the urban building density and volume rate are becoming higher and higher, which increases the area of impermeable pavement in cities, increases the surface runoff during rainfall, and reduces the rainfall infiltration recharge. At the same time, the extension of underground building space (such as underground garage, subway, etc.) breaks the connection between rainfall infiltration and groundwater and cuts off the source of rainfall recharge of groundwater, causing the continuous decline of groundwater level. The great change in underlying surface types in the urbanization process is also the main reason for the urban waterlogging problem under extreme rainstorm weather.

[0003] At present, under the concept of promoting the construction of a sponge city, the old city area is transformed into a sponge city, and rainwater collection and utilization are encouraged in areas with conditions. However, the current sponge city rainwater utilization engineering measures mainly focus on the collection and secondary reuse of rainwater, and only stay in the soil surface infiltration of rainwater collection and infiltration, and pay little attention to the recharge and utilization of rainwater collection for groundwater. Therefore, it is difficult to truly realize the rainwater utilization of a sponge city, and the waste of the original underground storage space resources is also caused. In addition, the combination effect of the existing rainwater utilization engineering measures is limited, and it is difficult to achieve comprehensive rainwater collection and more scientific utilization of collected rainwater. SUMMARY

[0004] In order to solve the above problems, a sponge city rainwater collection, storage, infiltration and recharge system is provided, which fully realizes the rainwater resource utilization, can maximize the collection and utilization of rainwater during rainfall, can effectively alleviate the urban waterlogging pressure during heavy rain, can compensate for the reduction of groundwater infiltration recharge caused by project construction, can improve the rainwater resource utilization efficiency, and can solve the problems in the prior art.

[0005] The application provides the following technical scheme:

[0006] A sponge city rainwater collection, storage, infiltration and recharge system comprises:

[0007] A rainwater collection system, wherein the rainwater collection system comprises a road surface infiltration promotion collection system, a green land waterlogging infiltration collection system, a road surface rainwater collection facility, a roof rainwater collection facility and an underground rainwater pipe network collection system; the road surface infiltration promotion collection system and the green land waterlogging infiltration collection system are used to promote the infiltration of rainwater and increase the rainfall infiltration recharge of the stratum.

[0008] The rainwater storage and reuse system comprises a rainwater diversion device, an underground rainwater storage tank, a sludge discharge and pumping device, and a water quality simple treatment and reuse device, and is used for rainwater storage and simple treatment and reuse.

[0009] The rainwater purification system comprises a silica sand honeycomb purification tank and a sludge discharge and pumping device, and is used for rainwater quality re-purification treatment.

[0010] A slow flow control system is arranged between the rainwater storage and reuse system and the rainwater purification system, and is used for slow flow pumping and control.

[0011] The irrigation and pumping dual-purpose and monitoring system comprises a first pressure relief well, a flow monitoring well, a seepage well, a deep and shallow monitoring well, and a water level and water quality monitoring remote terminal, and is used for direct reuse of the purified rainwater, and monitoring of underground water dynamic changes.

[0012] Further, a buried water collecting pipe and an overflow pipe are arranged in the road surface permeation and infiltration collection system and the green land waterlogging infiltration collection system respectively, and the buried water collecting pipe and the overflow pipe are connected with the underground rainwater pipe network respectively.

[0013] The road surface permeation and infiltration collection system comprises a permeable brick road pavement structure and a grass planting brick road pavement structure; and the green land waterlogging infiltration collection system comprises a rainwater garden and a sunken green land.

[0014] Further, the permeable brick road pavement structure and the grass planting brick road pavement structure each comprise, from top to bottom, a permeable brick layer or a grass planting brick mixed pavement layer, a fine sand leveling layer, a mud stone mortar permeable layer, a gravel cushion layer, and a natural soil layer, the buried water collecting pipe is arranged in the gravel cushion layer, and a water filtering net is arranged outside the buried water collecting pipe.

[0015] Further, the rainwater garden comprises a green land, a fine sand mixed covering layer, a planting layer, a geotextile layer, a gravel cushion layer, and a natural soil layer, a first overflow pipe is arranged inside a slope surface of the rainwater garden, and the first overflow pipe is arranged obliquely in the slope surface of the rainwater garden; and the sunken green land comprises a green land, a fine sand mixed covering layer, a planting layer, a fine sand leveling layer, an egg gravel cushion layer, and a natural soil layer, a second overflow pipe is arranged in the sunken green land, the second overflow pipe is arranged along a vertical direction of the sunken green land, and a filtering net is arranged at a top end of the first overflow pipe and the second overflow pipe.

[0016] Further, the slow flow control system comprises a second pressure relief well and a valve well.

[0017] Further, the underground rainwater storage tank comprises a pre-storage tank and a post-storage tank, and the pre-storage tank is used for further slow flow, sedimentation, and standing of the rainwater.

[0018] Further, a baffle is arranged in the underground rainwater storage tank, the baffle divides the underground rainwater storage tank into a pre-storage pool and a post-storage pool; a first sludge pump is arranged in the pre-storage pool, the first sludge pump is connected with a first pump pipe which extends out of the storage tank; a reuse pump is arranged in the post-storage pool close to the baffle, the reuse pump is connected with a water quality simple treatment and reuse device through a second pump pipe; the water quality simple treatment and reuse device is arranged on the ground above the storage tank, the water quality simple treatment and reuse device comprises a water quality simple treatment device and a reuse water pipe, the water quality simple treatment device is composed of a small water quality treatment device and an ultraviolet sterilizer; the wastewater treated by the water quality simple treatment device is discharged into a municipal sewage pipeline through a wastewater discharge pipe; a first water pump is arranged in the post-storage pool away from the baffle, the first water pump is connected with a rainwater purification system through a third pump pipe and a slow flow control system.

[0019] Further, the water quality simple treatment and reuse device is powered by an external distribution box.

[0020] Further, the silica sand honeycomb purification tank is composed of a plurality of hexagonal cylindrical water storage spaces in a honeycomb structure, water inlet channels and water outlet channels are arranged in the silica sand honeycomb purification tank in different paths, the water inlet channels and the water outlet channels are connected with each honeycomb water storage space; a second sludge pump is arranged in a front section of the silica sand honeycomb purification tank, and a second water pump is arranged in a rear section of the silica sand honeycomb purification tank, the second water pump is connected with a irrigation and pumping dual-purpose and monitoring system through a pump pipe.

[0021] Further, a distribution box is arranged on the ground above the silica sand honeycomb purification tank.

[0022] Further, the second water pump pumps the purified rainwater to a rear-end infiltration well, so as to realize the purpose of directly recharging the underground aquifer after rainwater purification treatment; before the purified water pumped by the second water pump enters the infiltration well, the purified water is slowly discharged through a first pressure relief well.

[0023] Further, an artificial skylight is arranged at the top end of the silica sand honeycomb purification tank above the second water pump.

[0024] Further, the water inlet channel comprises two first water inlet pipes arranged along the honeycomb water storage spaces on both sides of the honeycomb purification tank and a W-shaped second water inlet pipe connected with the same side end of the first water inlet pipes, a third water inlet pipe is arranged in the middle of the second water inlet pipe, the water outlet channel is arranged in the honeycomb water storage space outside the water inlet channel; an activated aeration column is arranged at the bottom of the silica sand honeycomb purification tank.

[0025] Further, a gas-permeable impermeable layer is arranged at the bottom end of the silica sand honeycomb purification tank.

[0026] Further, the well head protection cap arranged at the top of the infiltration well is provided with a gas permeable hole; a flow monitoring meter is arranged on the recharge main pipeline in the flow monitoring well for online real-time metering of the direct recharge amount of rainwater; the deep and shallow monitoring wells include a deep monitoring well and a shallow monitoring well arranged near the infiltration well, and water level and water quality monitoring remote terminals and water level and water quality monitoring probes are arranged in the deep and shallow monitoring wells to monitor the dynamic changes of local shallow and deep groundwater in real time.

[0027] Further, the dynamic changes of local shallow and deep groundwater are monitored through the water level and water quality monitoring remote terminals and water level and water quality monitoring probes, and the direct recharge effect of groundwater is evaluated according to the groundwater level variation and the direct recharge of rainwater metered by the flow online monitoring metering facility.

[0028] The beneficial effects of the present application include but are not limited to:

[0029] The sponge city rainwater collection and infiltration recharge system designed by the present application maximizes the collection and utilization of rainwater during rainfall, proposes a rainwater collection and infiltration recharge system that integrates rainwater collection, storage, treatment, reuse, purification, infiltration and monitoring, and maximizes the utilization of rainwater resources, effectively reduces the risk of urban waterlogging, compensates for the reduction of groundwater infiltration recharge caused by project construction, and has important significance for groundwater conservation and sustainable development and utilization.

[0030] The rainwater collection and infiltration recharge system of the present application is suitable for water-deficient areas (such as karst areas or underground aquifer dry areas) with sufficient underground recharge (storage) space and good groundwater recharge conditions. Specifically, by arranging a road infiltration promotion collection system and a green space detention infiltration collection system in the rainwater collection system, the collection of general green planting area and road and roof rainwater is promoted, the rainwater infiltration is promoted, the comprehensive collection of rainwater is more fully realized, and the rainwater is used for subsequent storage, reuse, purification and recharge, which better ensures the sponge utilization of rainwater, effectively ensures the recharge of groundwater, prevents the continuous decline of groundwater level, and avoids the waste of original underground storage space resources. By further improving the structure of the underground rainwater storage tank, the collected rainwater resources are subjected to simple treatment at the front end, the burden of subsequent purification treatment is reduced, and the wider use of purified rainwater is ensured. By arranging a buffer control system between the rainwater storage and reuse system and the rainwater purification system, the flow is buffered, the flow is better guided and pressure is released, the flow of rainwater into the purification tank can be controlled, and the control is quantified. The rainwater purification system is built according to the honeycomb structure by using special silica sand bricks, which realizes the full and effective purification treatment of rainwater, has high impurity adsorption efficiency, and has good N and P removal effect in water chemical treatment. The irrigation and pumping dual-purpose and monitoring system better balances the recharge and exploitation in flood season and non-flood season, improves the irrigation and pumping dual-purpose efficiency, and prolongs the service life of the infiltration well. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 This is a flowchart illustrating the workflow of the sponge city rainwater harvesting, infiltration, and recharge system of the present invention.

[0033] Figure 2 This is a schematic diagram of the overall structure of the sponge city rainwater collection, infiltration and recharge system of the present invention;

[0034] Figure 3 This is a schematic diagram of the green space water retention infiltration collection system of the present invention;

[0035] Figure 4 This is a schematic diagram of the pavement permeability enhancement and infiltration collection system of the present invention;

[0036] Figure 5 This is a flow chart of the water purification process of the silica sand honeycomb purification tank of the present invention;

[0037] in, Figure 3 Aa-1 is a schematic diagram of the permeable brick pavement structure, and Aa-2 is a schematic diagram of the grass brick pavement structure. Figure 4 Ab-1 is a schematic diagram of a rain garden structure, and Ab-2 is a schematic diagram of a sunken green space structure.

[0038] In the drawings, 1, rainfall; 2, water flow direction; 3, pipe clamp; 4, rainwater pipe; 5, rainwater collection tank; 6, rainwater collection tank water outlet; 7, rainwater collection tank overflow pipe; 8, house; 9, ground rainwater collection opening; 10, underground rainwater collection pipe; 11, rainwater grate; 12, impermeable layer; 13, concrete block; 14, road pavement layer; 15, thick sand cushion layer; 16, rainwater well; 17, rainwater well cover; 18, ground; 19, rainwater disposal well; 20, rainwater disposal well cover; 21, asphalt layer; 22, filter screen; 23, gravel cushion layer; 24, disposal opening; 25, rainwater storage tank; 26, storage tank well cover; 27, pump pipe; 28, ladder; 29, sludge pump (emptying pump); 30, pre-storage tank; 31, storage level; 32, reuse pump; 33, distribution box; 34, simple water quality treatment device; 35, small water quality treatment device; 36, ultraviolet sterilizer; 37, water quality treatment connecting pipe; 38, reuse water pipe; 39, waste water discharge pipe; 40, post-storage tank; 41, water pumping pump; 42, pressure relief well; 43, pressure relief well cover; 44, valve well; 45, valve well cover; 46, valve; 47, silica sand honeycomb purification tank; 48, purification tank water inlet; 49, purification tank well cover; 50, artificial skylight; 51, air-permeable impermeable layer; 52, activated air column; 53, specially-made silica sand purification brick; 54, flow monitoring well; 55, flow monitoring well cover; 56, flow online monitoring and metering facility; 57, flange interface; 58, green land; 59, infiltration well; 60, deep monitoring well; 61, shallow monitoring well; 62, water level and water quality monitoring remote terminal; 63, wellhead protection cap; 64, air vent; 65, concrete base; 66, planting layer; 67, clay ball; 68, weak permeable layer; 69, aquifer; 70, well water level; 71, submersible pump; 72, water level and water quality monitoring probe; 73, bedrock layer; 74, bedrock fissure; 75, permeable brick layer; 76, fine sand leveling layer; 77, mudstone sand mortar permeable layer; 78, crushed stone cushion layer; 79, natural soil layer; 80, buried water collection pipe; 81, filter screen; 82, original soil layer; 83, geotextile layer; 84, fine sand mixed cover layer; 85, cobblestone paving layer; 86, trapezoidal stone cage; 87, first overflow pipe; 88, rainwater convergence direction; 89, vegetation; 90, underground infiltration direction; 91, storage tank water inlet pipe; 92, pre-storage tank baffle; 93, purification tank water outlet; 94, purification tank internal water inlet passage; 941, first water inlet pipe; 942, second water inlet pipe; 943, third water inlet pipe; 95, purification tank internal water outlet passage; 951, first water outlet passage; 96, purification tank internal water flow infiltration direction; 97, honeycomb storage space. DETAILED DESCRIPTION

[0039] The application will be further described in connection with specific embodiments, but the scope of protection of the present application is not limited to these embodiments.

[0040] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0041] Referring to Figures 1-2 , a sponge city rainwater collection and infiltration recharge system is shown, which mainly includes a rainwater collection system A, a rainwater storage and reuse system B, a slow flow control system C, a rainwater purification system D and a irrigation and pumping dual-purpose and monitoring system E.

[0042] Specifically, the rainwater collection system A includes roof rainwater collection facilities, road rainwater collection facilities, road infiltration promotion collection system Aa, green land waterlogging infiltration collection system Ab and underground rainwater pipe network collection system, mainly for collecting rainwater in roof, road, green land, rainwater garden and other areas during rainfall. Among them, the roof rainwater collection facilities include a house 8, a raindrop pipe 4 and a rainwater collection tank 5, a rainwater collection tank water outlet 6 and a rainwater collection tank overflow pipe 7 are arranged on the rainwater collection tank; the roof rainwater flowing through the roof surface enters the rainwater collection tank 5 through the raindrop pipe 4, the rainwater collection tank water outlet 6 is in a closed state during rainfall, and when the rainwater is full and reaches the height of the rainwater collection tank overflow pipe, the rainwater flows out through the rainwater collection tank overflow pipe, enters the underground rainwater collection pipe 10, and after the rain, the rainwater collection tank water outlet 6 can be opened for rainwater reuse. The road rainwater collection facilities are ground rainwater collection openings 9, such as rainwater openings and rainwater ditches. The roof rainwater collected by the roof rainwater collection facilities enters the rainwater well 16 through the road collection, and then enters the underground rainwater collection pipe 10 for collection. An impermeable layer 12 is arranged outside the rainwater collection opening, a concrete masonry 13 is arranged outside the impermeable layer, and the road surface outside the rainwater well is a road pavement layer 14. A thick sand cushion layer 15 is arranged below the road pavement layer. A plurality of rainwater wells are arranged, and the rainwater collected in the plurality of rainwater wells enters the subsequent rainwater storage and reuse system through the underground rainwater collection pipe 10.

[0043] Referring to Figure 3, shows the road surface rainwater collection facility of the above-mentioned road surface rainwater collection facility, and the road surface rainwater collection facility includes a permeable brick road pavement structure Aa-1 and a grass brick road pavement structure Aa-2. The permeable brick road pavement structure and the grass brick road pavement structure each include, from top to bottom, a permeable brick layer 75 or a grass brick mixed pavement layer, a fine sand leveling layer 76, a mud stone mortar permeable layer 77, a gravel cushion layer 78, and a natural soil layer 79. The buried water collecting pipe 80 is arranged in the gravel cushion layer, and the filter screen 81 is wrapped outside the buried water collecting pipe. During rainfall, rainwater is better infiltrated into the ground through the permeable brick layer 75 or the grass brick mixed pavement layer (such as the reference number 75, 66 in Aa-2) with good permeability, and then gradually infiltrates into the natural soil layer 79 through the fine sand leveling layer 76, the mud stone mortar permeable layer 77, and the gravel cushion layer 78, and then slowly infiltrates into the ground layer, and indirectly infiltrates to supplement the underground aquifer. With the increase of rainfall duration, the excess rainwater is further collected through the buried water collecting pipe 80 in the gravel cushion layer 78 with the wrapped filter screen 81, enters the underground rainwater pipe network collection system, and finally flows into the rainwater storage tank 25 of the rainwater storage and reuse system for storage and reuse.

[0044] Referring to Figure 4 , shows the above-mentioned green land rainwater infiltration collection system Ab, which includes a rainwater garden Ab1 and a sunken green land Ab2. The rainwater garden includes a green land 58, a fine sand mixed covering layer 84, a planting layer 66, a geotextile layer 83, a gravel cushion layer 78, and a natural soil layer 82. The overflow pipe 87 is arranged inside the slope surface of the rainwater garden, and the filter screen 22 is arranged at the top end of the overflow pipe. The overflow pipe is arranged obliquely in the slope surface of the rainwater garden. During rainfall, rainwater flows into the rainwater garden and the sunken green land. After the rainwater enters the rainwater garden, it gradually infiltrates into the natural soil layer 82 through the above-mentioned structure layers of the rainwater garden, and then slowly infiltrates into the ground layer, and indirectly infiltrates to supplement the underground aquifer. With the increase of rainfall duration, when the rainfall intensity is greater than the infiltration intensity, the excess rainwater accumulates on the green land surface 58, forms a certain water storage level 31, and when the water level reaches the height of the overflow pipe 87, the accumulated rainwater enters the underground rainwater pipe network collection system, the underground rainwater collecting pipe 10, and the rainwater well 16 through the overflow pipe 87 with the filter screen 22 at the pipe opening, and finally flows into the rainwater storage tank 25 for further storage and utilization. After the rainfall ends, the accumulated rainwater in the rainwater garden gradually infiltrates into the natural soil layer 82 through the above-mentioned structure layers of the rainwater garden.

[0045] The sunken green land comprises the green land 58, the fine sand mixed covering layer 84, the planting layer 66, the fine sand leveling layer 76, the egg gravel cushion layer 23 and the original soil layer 82, and the overflow pipe 87 with the filter screen 22 is arranged in the sunken green land and is arranged along the vertical direction of the sunken green land. After the rainwater enters the sunken green land, the rainwater is gradually infiltrated to the original soil layer 82 through the above-mentioned structure layers of the sunken green land and is slowly infiltrated through the stratum to indirectly infiltrate and supply the underground water-bearing layer. With the increase of the rainfall duration, when the rainfall intensity is greater than the infiltration intensity, the excessive rainwater is accumulated on the green land surface 58 to form a certain water storage level 31, and when the water level reaches the height of the overflow pipe 87 in the sunken green land, the accumulated rainwater is collected through the overflow pipe 87 with the filter screen 22 to enter the underground rainwater collection pipe network collection system, the underground rainwater collection pipe 10 and the rainwater well 16, and finally is collected into the rainwater storage tank 25 for further storage and utilization. After the rainfall ends, the accumulated rainwater in the sunken green land is gradually infiltrated to the original soil layer 82 through the structure layers. The filter screen 22 on the overflow pipe prevents impurities from entering the pipe to cause accumulation and blockage.

[0046] Compared with the way of directly recharging the rainwater to supply the underground water, the above-mentioned two sets of system structures of the pavement infiltration and collection and the green land water-retention infiltration and collection increase the rainwater collection capacity and promote the infiltration of the rainfall to the stratum through the infiltration and water-retention infiltration to indirectly infiltrate and supply the underground water.

[0047] After the rainwater is collected through the rainwater collection system A, the rainwater is treated and utilized through the rainwater storage and reuse system B. The rainwater storage and reuse system B mainly comprises the rainwater abandoned well 19, the rainwater storage tank 25, the water quality treatment simple device 34, the sludge pump 29, the reuse pump 32, the water pump 41 and the distribution box 33. After the rainwater is collected, the rainwater is firstly treated and abandoned in the rainwater abandoned well 19 and then is stored in the rainwater storage tank 25.

[0048] Wherein, the rainwater storage tank 25 is composed of a pre-storage pool 30 and a post-storage pool 40. The rainwater is first discarded through the discard port 24 at the bottom of the rainwater discard well 19 for early rainwater discard, and then is preliminarily filtered through the gravel and pebble cushion 23 laid in the rainwater discard well 19. When the water level in the rainwater discard well 19 is accumulated to the height of the storage tank water inlet pipeline 91, the rainwater enters the rainwater pre-storage pool 30 through the storage tank water inlet pipeline 91. The pre-storage pool 30 functions to further slow flow, deposit and stand of the rainwater. When the rainwater storage in the pre-storage pool 30 reaches the height of the pre-storage pool baffle 92, the relatively clean rainwater in the upper part of the pre-storage pool 30 passes over the pre-storage pool baffle 92 and enters the post-storage pool 40 for further storage. When the rainwater is fully stored, the water can be pumped into the simple water quality treatment device 34 through the reuse pump 32 for treatment and reuse. The simple water quality treatment device 34 contains a small water quality treatment device 35 and an ultraviolet sterilizer 36. The rainwater is supplied to greening, cleaning and sweeping after simple treatment through the reuse water pipeline 38. The wastewater after water quality treatment is discharged into the municipal sewage pipeline for centralized treatment through the wastewater discharge pipeline 39. Most of the rainwater stored in the storage tank is further treated by standing in the rainwater purification system D and then is reinjected into groundwater. After long-term rainwater collection, sludge is deposited at the bottom of the pre-storage pool 30. The sludge pump 29 arranged at the bottom can realize regular sludge discharge and flushing. In addition, the pump also has the function of emptying the water in the pre-storage pool.

[0049] The slow flow control system is arranged behind the rainwater storage and reuse system and is used for water pumping, slow flow and control. The rainwater stored in the rainwater storage tank 25 is first controlled by the slow flow control system C before being pumped into the rainwater purification system D by the water pump 41. The slow flow control system C is composed of a pressure relief well 42 and a valve well 44. The pressure relief well 42 functions to buffer flow and guide flow and relieve pressure. The valve well 44 functions to control the flow of rainwater into the purification tank.

[0050] Referring to Figure 2 and Figure 5The rainwater purification system D mainly comprises a silica sand honeycomb purification tank 47, a sludge pump 29, a water pump 41 and a distribution box 33. The silica sand honeycomb purification tank 47 is built by special silica sand bricks 53 in a honeycomb structure, forming a plurality of hexagonal cylindrical water storage spaces (hereinafter referred to as "honeycomb water storage spaces"). The silica sand honeycomb purification tank 47 is internally provided with water inlet channels 94 and water outlet channels 95 for connecting the honeycomb water storage spaces 97. Specifically, the water inlet channels 94 comprise two first water inlet pipes 941 arranged along the honeycomb water storage spaces on both sides of the silica sand honeycomb purification tank and a W-shaped second water inlet pipe 942 connected to the same side end of the first water inlet pipes. A third water inlet pipe 943 is arranged in the middle of the second water inlet pipe. The first, second and third water inlet pipes are connected to the pipeline where the water inlet 48 is located. The water outlet channels 95 are arranged in the honeycomb water storage spaces outside the water inlet channels. Specifically, the water outlet channels 95 comprise first water outlet channels 951 arranged on both sides of the third water inlet pipe 943. The two first water outlet channels converge and extend out of the silica sand honeycomb purification tank 47. A gas-permeable anti-seepage layer 51 is arranged at the bottom end of the silica sand honeycomb purification tank. An activated gas-permeable column 52 is arranged above the silica sand honeycomb purification tank. When the collected rainwater is pumped out of the front rainwater storage tank 25 and enters the silica sand honeycomb purification tank through the water inlet 48, the honeycomb water storage spaces 97 connected by the water inlet channels 94 are first filled with water. The water flows into the honeycomb water storage spaces 97 and then percolates through the special silica sand purification bricks 53 to the adjacent honeycomb water storage spaces 97. The honeycomb water storage spaces 97 are connected to the water outlet channels 95 in the silica sand honeycomb purification tank. The rainwater percolated through the special silica sand purification bricks 53 is collected in the honeycomb water storage spaces 97 at the water outlet end and stored. The special silica sand purification bricks 53 have water purification treatment functions such as water permeability, impurity adsorption and water chemical treatment (N and P removal). After the collected rainwater is stored in the silica sand honeycomb purification tank for a period of time (2-3 days), the rainwater purification effect can be achieved. The purified rainwater is pumped out by the water pump 41 arranged inside the tank and then poured into the infiltration well 59 at the rear end, so as to achieve the purpose of directly recharging the underground aquifer after rainwater purification. In addition, the activated gas-permeable column 52 arranged at the bottom of the silica sand honeycomb purification tank has the function of gas permeability and water impermeability, which can avoid the risk of deterioration of the rainwater in the purification tank due to long-term storage. After long-term use of the rainwater purification system D, sludge will be deposited in the honeycomb water storage spaces at the water inlet end. The sludge pump 29 arranged therebetween can realize regular sludge flushing and emptying treatment of the purification tank.

[0051] Referring to Figure 2, the dual-purpose irrigation and pumping system E is mainly composed of a pressure relief well 42, a flow monitoring well 54, a flow online monitoring and metering facility 56, a seepage well 59, a deep monitoring well 60, a shallow monitoring well 61, a water level and water quality monitoring remote terminal 62, and a submersible pump 71, wherein the submersible pump is arranged in the seepage well. Rainwater is treated by the rainwater purification system D and can be directly used as a recharge source for groundwater. During the flood season, more rainwater is used to recharge and conserve groundwater, and during the non-flood season, the submersible pump 71 arranged in the well can be used to reasonably exploit and utilize the groundwater, thereby realizing the dual-purpose function of irrigation and pumping. In addition, regular pumping can also reduce the risk of clogging of the seepage well caused by long-term recharge during the flood season, thereby improving the efficiency of dual-purpose irrigation and pumping and further prolonging the service life of the seepage well 59. After the rainwater is purified by the silica sand honeycomb purification tank 47, the water flow is slowed down and pressure is released by the pressure relief well 42 before entering the seepage well 59, so as to avoid the large water flow impact of the water pump 41 in the silica sand honeycomb purification tank 47. At the same time, the air vent 64 is arranged on the wellhead protection cap 63 of the seepage well, so as to avoid the air block phenomenon caused by the large underground pressure under the condition of large recharge flow, and to release the underground pressure during recharge. The flow online monitoring and metering facility 56 is arranged on the recharge main pipeline in the flow monitoring well 54, which is used for online real-time metering of the direct recharge amount of rainwater. The deep monitoring well 60 and the shallow monitoring well 61 are arranged near the seepage well, respectively. The water level and water quality monitoring remote terminal 62 and the water level and water quality monitoring probe 72 arranged in the deep monitoring well and the shallow monitoring well are used to monitor the dynamic changes of the local shallow and deep groundwater in real time. Through the groundwater level amplitude and the direct recharge condition of rainwater metered by the flow online monitoring and metering facility 56, the direct recharge effect of groundwater is evaluated. Through the water quality monitoring condition, it is determined whether to perform direct recharge or not, so as to prevent the groundwater quality from being polluted. According to the dynamic change condition of the groundwater in different periods, the water level threshold under the conditions of groundwater recharge and exploitation is set, so as to provide a management basis for optimizing the development and utilization of groundwater, to ensure the recharge and supply of groundwater by rainwater during the flood season, and to ensure the reasonable development and utilization of groundwater.

[0052] The application can be used for urban reconstruction or planning and construction of newly-built urban areas, and aims to provide a rainwater collection, storage, treatment, reuse, purification, infiltration and dual-purpose irrigation and pumping and monitoring system for arid and water-deficient areas, so that rainwater during rainfall is maximally collected and utilized, rainwater resource utilization is maximally realized, the risk of urban waterlogging is reduced, the influence of project construction on groundwater infiltration recharge is compensated, and the groundwater source conservation and sustainable development and utilization are of great significance.

[0053] The above merely illustrates the embodiments of the present application, and the protection scope of the present application is not limited to these specific embodiments, but determined by the claims of the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the technical thought and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A sponge city rainwater collection, infiltration and recharge system, characterized in that, The system comprises: a rainwater collection system comprising a road surface permeation and infiltration collection system, a green land waterlogging infiltration collection system, a road surface rainwater collection facility, a roof rainwater collection facility and an underground rainwater pipe network collection system; the road surface permeation and infiltration collection system and the green land waterlogging infiltration collection system are used to promote rainwater infiltration and increase stratum rainfall infiltration recharge; a rainwater storage and reuse system comprising a rainwater flow rejection device, an underground rainwater storage tank, a sludge discharge and pumping device, a water quality simple treatment and reuse device, which is used for rainwater storage and simple treatment and reuse; a rainwater purification system comprising a silica sand honeycomb purification tank and a sludge discharge and pumping device, which is used for rainwater quality re-purification treatment; the silica sand honeycomb purification tank is built in a honeycomb structure to form a plurality of hexagonal cylindrical water storage spaces, water inlet channels and water outlet channels are arranged in the silica sand honeycomb purification tank according to different paths, the water inlet channels and the water outlet channels are connected with each honeycomb water storage space; a second sludge discharge pump is arranged in the front section of the silica sand honeycomb purification tank, and a second pumping pump is arranged in the rear section of the silica sand honeycomb purification tank, the second pumping pump is connected with a irrigation and pumping dual-purpose and monitoring system through a pump pipe; the water inlet channel comprises two first water inlet pipes arranged along the honeycomb water storage spaces on both sides of the honeycomb purification tank and a W-shaped third water inlet pipe connected with the same side end of the first water inlet pipes, a fourth water inlet pipe is arranged in the middle of the third water inlet pipe, the water outlet channel is arranged in the honeycomb water storage space outside the water inlet channel; an activated aeration column is arranged at the bottom of the silica sand honeycomb purification tank; a slow flow control system is arranged between the rainwater storage and reuse system and the rainwater purification system, which is used for pumping and slow flow control; an irrigation and pumping dual-purpose and monitoring system comprising a first pressure relief well, a flow monitoring well, a seepage well, a deep and shallow monitoring well and a water level and water quality monitoring remote terminal, which is used for direct rainwater reuse after purification and underground water dynamic change monitoring.

2. The sponge city rainwater harvesting and infiltration recharge system according to claim 1, characterized in that, buried water collecting pipes and overflow pipes are arranged in the road surface permeation and infiltration collection system and the green land waterlogging infiltration collection system respectively, and the buried water collecting pipes and the overflow pipes are connected with the underground rainwater pipe network respectively; the road surface permeation and infiltration collection system comprises a permeable brick pavement structure and a grass planting brick pavement structure; the green land waterlogging infiltration collection system comprises a rainwater garden and a sunken green land. 3.The sponge city rainwater storage and infiltration recharge system according to claim 2, characterized in that, the permeable brick pavement structure and the grass planting brick pavement structure both comprise, from top to bottom, a permeable brick layer or a grass planting brick mixed pavement layer, a fine sand leveling layer, a mud and sand mortar permeable layer, a gravel cushion layer and a natural soil layer, the buried water collecting pipes are arranged in the gravel cushion layer, and a water filtering net is arranged outside the buried water collecting pipes.

4. The sponge city rainwater harvesting and infiltration recharge system according to claim 2, characterized in that, the rainwater garden comprises a green land, a fine sand mixed covering layer, a planting layer, a geotextile layer, a gravel cushion layer and a natural soil layer, a first overflow pipe is arranged inside the slope surface of the rainwater garden, and the first overflow pipe is arranged obliquely in the slope surface of the rainwater garden; the sunken green land comprises a green land, a fine sand mixed covering layer, a planting layer, a fine sand leveling layer, an egg gravel cushion layer and a natural soil layer, a second overflow pipe is arranged in the sunken green land, the second overflow pipe is arranged along the vertical direction of the sunken green land, and a filtering net is arranged at the top of the first overflow pipe and the second overflow pipe.

5. The sponge city rainwater harvesting and infiltration recharge system according to claim 1, characterized in that, The slow flow control system comprises a second pressure relief well and a valve well. 6.The sponge city rainwater harvesting and infiltration system according to claim 1, characterized in that, The underground rainwater reservoir comprises a pre-storage pool and a post-storage pool, and the pre-storage pool is used for further slow flow, precipitation and standing of rainwater.

7. The sponge city rainwater harvesting and infiltration recharge system according to claim 6, characterized in that, A baffle is arranged in the underground rainwater reservoir, and the baffle divides the underground rainwater reservoir into the pre-storage pool and the post-storage pool; a first sludge discharge pump is arranged in the pre-storage pool and connected with a first pump pipe extending out of the reservoir; a reuse pump is arranged in the post-storage pool close to the baffle and connected with a water quality simple treatment and reuse device through a second pump pipe; the water quality simple treatment and reuse device is arranged on the ground above the reservoir, and comprises a water quality simple treatment device composed of a small water quality treatment device and an ultraviolet sterilizer, and a reuse water pipe; the wastewater treated by the water quality simple treatment device is discharged into a municipal sewage pipeline through a wastewater discharge pipe; a first water pump is arranged in the post-storage pool away from the baffle and connected with a rainwater purification system through a third pump pipe and the slow flow control system. 8.The sponge city rainwater harvesting and infiltration system of claim 1, wherein, A gas permeation hole is arranged on the wellhead protection cap of the infiltration well; a flow monitoring facility for online monitoring and metering is arranged on the main recharge pipeline in the flow monitoring well, which is used for online real-time metering of the direct rainwater recharge amount; the deep and shallow monitoring wells comprise a deep monitoring well and a shallow monitoring well arranged near the infiltration well, and a water level and water quality monitoring remote terminal and a water level and water quality monitoring probe are arranged in the deep and shallow monitoring wells to monitor the dynamic change of local shallow and deep underground water in real time.

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