Sponge city rainwater recycling sand-based microbead technology self-cleaning system

Abstract

The application discloses a sponge city rainwater collection and utilization sand-based microbead technology self-cleaning system, and belongs to the rainwater recycling field.The sponge city rainwater collection and utilization sand-based microbead technology self-cleaning system comprises a distribution pool formed in a pool body and used for sedimentation and diversion of inlet water, a purification pool formed in the pool body and separated from the distribution pool by a first partition plate, an oxidation and fresh-keeping pool formed in the pool body and separated from the water purification pool by a second partition plate, a first purification area, wherein a plurality of honeycomb structure purification wells are arranged, and the purification wells are formed by stacking nano-bioenzyme sand-based microbead water purification blocks; and a second purification area, wherein a plurality of honeycomb structure filtration wells are arranged, and the filtration wells are formed by stacking nano-bioenzyme sand-based microbead composite water filtration blocks.The sponge city rainwater collection and utilization sand-based microbead technology self-cleaning system has the beneficial effects that the multi-pool arrangement effectively guarantees the purification effect of the sponge city sand-based microbead technology self-cleaning system and the short-time and rapid inlet of large flow of water into the pool during a heavy rainstorm.

Description

Technical Field

[0001] This application relates to the field of rainwater harvesting and utilization technology, and more specifically, to a self-cleaning system for rainwater harvesting and utilization in sponge cities using sand-based microsphere technology. Background Technology

[0002] Rainwater harvesting and reuse refers to a system that collects rainwater through catchment ditches and channels before it enters the main sewer system, and then purifies the rainwater using a rainwater purification device to ensure it meets design standards. For example... Figure 8 In a publicly available rainwater harvesting and purification tank, rainwater first passes through a sedimentation well, then through a silica sand well and a filter wall for filtration, before being pumped out. The entire purification tank has a well-like structure. However, in this method, the sedimentation wells are too small, making them prone to clogging and causing sediment to seep into the entire tank, affecting purification efficiency and effectiveness. Furthermore, subsequent dredging and maintenance are difficult and costly, and the tank cannot handle large flows of water entering during heavy rain. Figure 8 In an open system, the water inlet and outlet are separate channels, and the inlet and outlet walls only perform one filtration process. This results in minimal filtration, poor water purification, and difficulty in ensuring the quality of the effluent. Summary of the Invention

[0003] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0004] To address the technical problems mentioned in the background section, some embodiments of this application provide a self-cleaning system for rainwater harvesting and utilization in sponge cities using sand-based microspheres, including...

[0005] The pool body includes a bottom slab, a cover slab, and side walls, wherein the side walls are made of concrete.

[0006] A distribution tank, formed within a pool, is used for settling and diverting incoming water;

[0007] The purification tank is formed within the pool body and is separated from the distribution tank by a first partition.

[0008] An oxidation preservation tank is formed inside the tank body and is separated from the water purification tank by a second partition.

[0009] The first purification zone is located in the purification pool and is used to purify the incoming water through infiltration. It contains multiple honeycomb-structured purification wells, which are formed by stacking nano-bio-enzyme sand-based microbead water purification blocks.

[0010] The second purification zone is arranged in the purification pool and located at the rear side of the first purification zone, and is used for filtering and purifying the water inlet; a plurality of filter wells in a honeycomb structure are arranged in the second purification zone, and the filter wells are formed by stacking nano-bioenzyme sand-based micro-bead composite water filtering blocks;

[0011] The water inlet pipe is connected with the distribution pool.

[0012] The water outlet pipe is connected with the oxidation and fresh-keeping pool.

[0013] The overflow pipe is connected with the municipal pipe network or overflows into a river.

[0014] The nano-bioenzyme sand-based micro-bead water purification block comprises, in mass fractions, 1200 parts of medium sand, 300 parts of ceramic micro-beads, 700 parts of cement mixture, 166 parts of mixed material, 35 parts of shellfish shell powder and 9 parts of nano-bioenzyme; wherein the mixed material is one or a combination of more than one of blast furnace slag, zeolite and sponge iron.

[0015] The nano-bioenzyme sand-based micro-bead composite water filtering block comprises a base layer and a surface layer, and the surface layer comprises, in mass fractions, 1500 parts of coated sand, 28 parts of curing agent, 68 parts of adhesive resin, 16 parts of hydrophilic resin and 38 parts of quartz powder.

[0016] The base layer comprises, in mass fractions, 1200 parts of medium sand, 300 parts of ceramic micro-beads, 700 parts of cement mixture, 166 parts of mixed material, 35 parts of shellfish shell powder and 9 parts of nano-bioenzyme; wherein the mixed material is one or a combination of more than one of blast furnace slag, zeolite and sponge iron.

[0017] The bottom plate is provided with a plurality of air-permeable anti-seepage structures, and the bottom plate comprises a bottom layer and a cushion layer, the bottom layer is a reinforced concrete layer, and the cushion layer is a sand-free large-pore concrete layer.

[0018] The air-permeable anti-seepage structure comprises, from top to bottom, an air-permeable layer, a protective layer, an anti-seepage layer and a leveling layer, the air-permeable layer is composed of air-permeable activated material, the protective layer is composed of thick river sand, the anti-seepage layer is composed of sand-based air-permeable anti-seepage active composite material, and the leveling layer is composed of sand.

[0019] The sand-based air-permeable anti-seepage active composite material comprises, in mass fractions, 1600 parts of aggregate, 0.3 parts of dodecyl trimethoxysilane, 8 parts of aliphatic hydrocarbon resin and 17 parts of polytetrafluoroethylene.

[0020] The aggregate is a mixture of sintered ceramic sand with a particle size of 825-600 μm and sintered ceramic sand / yellow sand with a particle size of 212-150 μm in a weight ratio of 2:1.

[0021] The air-permeable anti-seepage structure is distributed in the distribution pool, the purification pool and the oxidation and fresh-keeping pool at a ratio of 1:2:1-2.

[0022] The bottom of the distribution pool has a recess to form a sedimentation zone, and the upper portion is provided with a first inspection well formed by stacking nano-bioenzyme sand-based micro-bead composite water filtering blocks.

[0023] The bottom of the oxidation preservation pool has a recess to form a pumping zone, and the pumping zone is provided with a lifting pump, and the water outlet of the lifting pump is connected with a water outlet pipe; the upper portion of the oxidation preservation pool is provided with a second inspection well formed by stacking nano-bioenzyme sand-based micro-bead composite water filtering blocks; and the side wall of the oxidation preservation pool is provided with an overflow pipe located above the water outlet pipe.

[0024] The first and second partitions are respectively provided with water passing holes.

[0025] The application has the beneficial effect of providing a multi-pool structure sponge city rainwater collection and utilization sand-based micro-bead technology self-cleaning system. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

[0027] In addition, throughout the drawings, same or similar reference numerals are used to represent same or similar elements. It should be understood that the drawings are schematic, and the elements and elements are not necessarily drawn according to the scale.

[0028] In the drawings:

[0029] Figure 1 is a whole schematic diagram according to the embodiment of the present application, and the lines in the diagram are water flow direction schematics;

[0030] Figure 2 is Figure 1 is a sectional view along line 1-1 in

[0031] Figure 3 is Figure 1 is a sectional view along line 2-2 in

[0032] Figure 4 is a distribution schematic diagram of the air-permeable and impermeable structure on the bottom plate in the present application;

[0033] Figure 5 is a structural schematic diagram of the bottom plate in the present application;

[0034] Figure 6 is a structural schematic diagram of the air-permeable and impermeable structure in the present application;

[0035] Figure 7is a schematic view of the block stacking in the present application;

[0036] Figure 8 is a schematic view of the structure of the prior art. DETAILED DESCRIPTION

[0037] Embodiments of the present disclosure will be described in detail below with reference to the drawings. Although certain embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be interpreted as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly and completely understood. It should be understood that the drawings of the present disclosure are for exemplary purposes only and are not intended to limit the scope of protection of the present disclosure.

[0038] It should also be noted that, for ease of description, only parts related to the present application are shown in the drawings. The embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0039] It should be noted that the concepts of "first", "second", etc. mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0040] It should be noted that the modification of "one", "multiple" mentioned in the present disclosure is illustrative and not restrictive, and those skilled in the art should understand that unless otherwise explicitly indicated in the context, it should be understood as "one or more".

[0041] The present disclosure will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0042] As Figures 1-7As shown, a sponge city rainwater collection and utilization sand-based microbead technology self-cleaning system includes a pool body 1, a distribution pool 2, a purification pool 3, a first purification area 31, a second purification area 33, an oxidation preservation pool 4, a water inlet pipe 5, a water outlet pipe 6, and a breathable anti-seepage structure 7. The pool body 1 includes a bottom plate 11, a cover plate 12, and a side wall 13. The distribution pool 2, the purification pool 3, and the oxidation preservation pool 4 are sequentially distributed in the pool body 1 from left to right. The distribution pool 2 and the purification pool 3 are separated by a first partition plate 14. The purification pool 3 and the oxidation preservation pool 4 are separated by a second partition plate 15. The first partition plate 14 and the second partition plate 15 are respectively provided with water passing holes 8. The distribution pool 2 is used for sedimentation and diversion of inlet water. The purification pool 3 is used for permeation and purification of inlet water. The oxidation preservation pool 4 is used for storing purified water. The first purification area 31 is arranged in the purification pool 3 and is used for permeation and purification of inlet water. A plurality of honeycomb structure purification wells 32 are arranged in the first purification area 31. The purification wells 32 are formed by stacking nano-bioenzyme sand-based microbead water purification blocks 321. After the single purification well 32 is stacked, a plurality of purification wells 32 are assembled to form a purification wall. The second purification area 33 is arranged in the purification pool 3 and is located at the rear side of the first purification area 31. The second purification area 33 is used for filtering and purifying inlet water. A plurality of honeycomb structure filtering wells 34 are arranged in the second purification area 33. The filtering wells 34 are formed by stacking nano-bioenzyme sand-based microbead composite water filtering blocks 341. After the single filtering well 34 is stacked, a plurality of filtering wells 34 are assembled to form a filtering wall. The traditional silica sand oxidation preservation pool is arranged in three pools. Rainwater is deposited in the distribution pool 2, and the deposited water enters the purification pool, effectively avoiding the blockage of the filtering blocks by the mud and sand carried in the water, ensuring the water purification effect and efficiency. The oxidation preservation pool is arranged to solve the problem that the treatment facilities are often idle due to the randomness of rainfall and the instability of recycled water sources, ensuring that water can be discharged at any time when needed. Rainwater is filtered into the silica sand honeycomb biological purification preservation pool (filtering, storage, purification, and preservation are completed in one step), and the water does not smell after long-term storage due to the layer-by-layer filtering and microbial self-purification effect.

[0043] Specifically, the nano-biozyme sand-based micro-bead water purification block comprises, in parts by mass, 1200 parts of medium sand, 300 parts of ceramic micro-beads, 700 parts of cement mixture, 166 parts of admixture, 35 parts of crustacean shell powder, and 9 parts of nano-biozyme. The nano-biozyme sand-based micro-bead composite water filtration block comprises a base layer and a surface layer. The surface layer comprises, in parts by mass, 1500 parts of coated sand, 28 parts of curing agent, 68 parts of adhesive resin, 16 parts of hydrophilic resin, and 38 parts of quartz powder. The base layer has the same structure as the nano-biozyme sand-based micro-bead water purification block and comprises, in parts by mass, 1200 parts of medium sand, 300 parts of ceramic micro-beads, 700 parts of cement mixture, 166 parts of admixture, 35 parts of crustacean shell powder, and 9 parts of nano-biozyme. The water filtration block has a surface layer added to the water purification block, so that the pore size of the water filtration block can reach the micron level. The water purification block is placed in front of the water filtration block, and the water filtration block is placed in back of the water purification block, thereby playing a role of layer-by-layer filtration, gradually improving the purification effect, and providing better water quality. The use of the coated sand with air permeability, the biozyme, and the crustacean shell powder formula can achieve adsorption, decomposition, and absorption of COD in water, and chelate and remove harmful metals such as cadmium, copper, nickel, and chromium. Secondly, the addition of the hydrophilic resin to the surface layer can attract rainwater into the base layer, provide sufficient purification time for the base layer, and avoid the water flowing too quickly through the base layer and failing to fully contact the biozyme.

[0044] The above-mentioned admixture is one or a combination of more than one of blast furnace slag, zeolite, and sponge iron. As shown in Table 1, there are four kinds of mixing ratios in this embodiment, corresponding to different purification effects. The nano-biozyme sand-based micro-bead water purification block prepared by mixing different raw materials can use probiotics to achieve adsorption, decomposition, and absorption of COD in water, achieve adsorption, decomposition, and absorption of nitrogen (NO3-N, NH3-N, TN), phosphorus (TP), and metal elements (Cu, Zn, Cd) in water, and achieve precise and efficient purification of water quality.

[0045] Table 1

[0046] Model Proportioning composition Function NQ-1 50% blast furnace slag + 50% zeolite COD reduction NQ-2 100% sponge iron NO-3-N, TP reduction NQ-3 100% zeolite NH3-N, TN reduction NQ-4 50% blast furnace slag + 50% sponge iron Cu, Zn, Cd reduction

[0047] The above-mentioned curing agent is vinyl tributylketoxime silane. The adhesive resin is selected from C5 aliphatic hydrocarbon resin. The hydrophilic resin is selected from hydrophilic polyurethane resin. The cement mixture comprises 70% by mass of cement and 30% by mass of fly ash. The above-mentioned nano-biozyme is prepared by mixing alpha-amylase, catalase, and cellulose disaccharide hydrolytic enzyme at a ratio of 5:3:3. The thickness ratio of the surface layer to the base layer is 1:20, specifically, the thickness of the surface layer is 6 mm, and the thickness of the base layer is 120 mm.

[0048] In this embodiment, the side wall 13 and the cover plate 12 are both concrete structures, which means reinforced concrete, thereby increasing the safety of the pool. Figure 8The system avoids the influence of geological prying and soil lateral pressure, causes the geomembrane to be torn, and the stones in the backfill soil easily pierce the geomembrane to cause the water leakage of the oxidation preservation pond. The system as a whole adopts prefabricated modules, on-site assembly, and short construction period.

[0049] As shown in Figures 3-5 The bottom plate 11 includes a bottom layer 100 which is a reinforced concrete layer and a cushion layer 200 which is a sand-free large-pore concrete layer. The bottom plate 11 is distributed with a plurality of air-permeable anti-seepage structures 7 which are square and have a specification of 600mm*600mm. The self-purification of the water body is mainly completed by microorganisms, and the growth of microorganisms requires three conditions: 1. constant temperature; 2. microorganism growth attachment bed; and 3. ensure the content of dissolved oxygen. The setting of the air-permeable anti-seepage structure makes the bottom of the pond body air-permeable and water-impermeable, and the water bodies on the pond surface and the pond bottom perform microcirculation, the air film on the pond surface is converted into liquid film, thereby bringing the oxygen in the air into the pond body, increasing the content of dissolved oxygen in the pond, and ensuring that the content of dissolved oxygen is not less than 5mg / L. The top plate of the pond body is covered with more than 80cm of soil, and the entire pond is below the ground, which is basically constant temperature. The water purification block, the water filtration block, and the air-permeable activation material are all composed of uneven materials, which are conducive to the attachment of microorganisms. In this way, the growth conditions of microorganisms are ensured, and the water in the pond body is well purified and can be preserved without odor.

[0050] The air-permeable anti-seepage structure 7 includes, from top to bottom, an air-permeable layer 71, a protection layer 72, an anti-seepage layer 73, and a leveling layer 74. The air-permeable layer 71 is composed of 600*300*60 air-permeable activation material, the protection layer 72 is composed of 100 thick river sand, the anti-seepage layer 73 is composed of 50 thick sand-based air-permeable anti-seepage active composite material, and the leveling layer 74 is composed of 90 thick sand. The sand-based air-permeable anti-seepage active composite material includes, by mass fraction: 1600 parts of aggregate, 0.3 parts of dodecyl trimethoxysilane, 8 parts of aliphatic hydrocarbon resin, and 17 parts of polytetrafluoroethylene. The sintered ceramic sand has low thermal expansion, low angular coefficient, and low acid consumption value, round particle shape, high refractoriness, good wear resistance, good thermal shock resistance, good compression resistance, good water resistance, and good compression resistance. Among them, the aggregate is a mixture of 825-600μm sintered ceramic sand and 212-150μm sintered ceramic sand / yellow sand in a weight ratio of 2:1. The sintered ceramic sand mixed in this way as an aggregate has better water resistance and compression resistance than the sintered ceramic sand of a single particle size used alone as an aggregate, and achieves better air-permeable anti-seepage effect. Preferably, the air-permeable anti-seepage structure 7 has a distribution ratio of 1:2:1-2 in the distribution pond 2, the purification pond 3, and the oxidation preservation pond 4.

[0051] As shown in Figure 2 , Figure 3As shown, the bottom of the distribution tank 2 has a recess to form a sedimentation zone 21, the size of the sedimentation zone 21 is 1200*1200mm, and the upper part is provided with a first inspection well 22, which is formed by stacking nano-bioenzyme sand-based micro-bead composite water filtration blocks. The sidewall of the distribution tank 2 is provided with a ladder 23, which extends from the first inspection well 22 to the sedimentation zone 21. As shown, the depth of the oxidation preservation tank 4 is ≤8m, the bottom of the oxidation preservation tank 4 has a recess to form a pumping zone 41, the size of the pumping zone 41 is 1200mm*1200mm, and the pumping zone 41 is provided with a lifting pump 42, the water outlet of the lifting pump 42 is connected with the water outlet pipe 6; the upper part of the oxidation preservation tank 4 is provided with a second inspection well 43, which is formed by stacking nano-bioenzyme sand-based micro-bead composite water filtration blocks, and the sidewall is also provided with a ladder; the sidewall of the oxidation preservation tank 4 is provided with an overflow pipe 44, which is located above the water outlet pipe 6.

[0052] The water inlet pipe 5 is connected with the distribution tank 2, and the water outlet pipe 6 is connected with the oxidation preservation tank 4. The distribution tank 2 is provided with a water inlet on the upper part corresponding to the water inlet pipe 5, and the oxidation preservation tank 4 is provided with a water outlet and an overflow on the upper part corresponding to the water outlet pipe 6 and the overflow pipe 44. The setting height of the water inlet, the water outlet and the overflow is 20cm below the cover plate, and the position of the overflow is slightly higher than that of the water outlet.

[0053] The above, the innovation of the sand-based micro-bead technology of the sponge city silica sand rainwater collection and utilization system lies in: layer-by-layer filtration + microbial self-purification + basic maintenance-free in later period + zero-cost operation, which is as follows:

[0054] (1) Multi-stage micro-A- / O water storage self-purification new technology, develop sand-based micro-bead honeycomb facilities with storage and purification in one body, realize microbial self-purification function, without adding chemical agents and aeration equipment for purification. (2) Adopt self-developed nano-bioenzyme sand-based micro-bead well tube water purification block with water permeation and filtration function, which is safe, stable, strong in pressure bearing and modularized assembly. Preform template, on-site assembly, short construction period. (3) The bottom regularly lays sand-based micro-bead air-permeable anti-seepage active composite material with air-permeable and non-leakage characteristics, promotes water microcirculation, achieves self-oxygen enrichment function, constructs oxygen-rich, oxygen-deficient and anaerobic environment micro-units, promotes the reproduction of aerobic, anaerobic and facultative bacteria, and realizes the functions of "zero energy consumption, self-purification, long preservation, maintenance-free". (4) The sand-based micro-bead honeycomb facilities with storage and purification in one body can keep water fresh for a long time without odor, which breaks through the difficulty of increasing aeration device every day to purify water quality and saves electricity. (5) The water inlet and outlet are divided to realize instantaneous large-flow water inlet and outlet. The service life is more than 100 years. (6) Collection, filtration, purification and preservation are completed at one time, and the later period is basically maintenance-free. A good technical path is found to solve blue dyeing and water body blackening and odor. The water quality of the system outlet reaches the surface water I I-IV class water standard.

[0055] The above description is merely exemplary of some of the many possible embodiments of the present disclosure and of the principles thereof. It is to be understood that those skilled in the art will be able to devise various embodiments of the present disclosure without departing from the scope of the present disclosure as disclosed in the above description and attached claims, and that the scope of the present disclosure is not limited to the specific technical features described above. For example, the technical features described above can be replaced with other technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) to form other technical solutions.

Claims

1. A sponge city rainwater collection and utilization sand-based microbead technology self-cleaning system, characterized in that: The utility model relates to a kind of water purification system, including: ​ Pool body, including bottom plate, cover plate and side wall, the side wall is concrete structure; Distribution pool, formed in pool body, for the settlement and diversion of incoming water; Purification pool, formed in pool body, separated from distribution pool by first partition; Oxidation preservation pool, formed in pool body, separated from water purification pool by second partition; First purification area, provided in purification pool, for the penetration purification of incoming water, multiple honeycomb structure purification wells are provided in it, which are formed by nano-biozyme sand-based microbead water purification block stacking; Second purification area, provided in purification pool, located at the rear side of first purification area, for the filtration purification of incoming water;Multiple honeycomb structure filtration wells are provided in it, which are formed by nano-biozyme sand-based microbead composite water filtration block stacking; Inlet pipe, connected with distribution pool; Outlet pipe, connected with oxidation preservation pool; Overflow pipe, connected with municipal pipe network or overflow to river;The nano-biozyme sand-based microbead water purification block includes, by mass fraction: medium sand 1200 parts, ceramic microbead 300 parts, cement mixture 700 parts, mixture 166 parts, shellfish shell powder 35 parts, nano-biozyme 9 parts;Among them, the mixture is one or more combinations of blast furnace slag, zeolite and sponge iron;The nano-biozyme sand-based microbead composite water filtration block includes base layer and surface layer, the surface layer includes, by mass fraction: coated sand 1500 parts, curing agent 28 parts, adhesive resin 68 parts, hydrophilic resin 16 parts, quartz powder 38 parts;The base layer includes, by mass fraction: medium sand 1200 parts, ceramic microbead 300 parts, cement mixture 700 parts, mixture 166 parts, shellfish shell powder 35 parts, nano-biozyme 9 parts;Among them, the mixture is one or more combinations of blast furnace slag, zeolite and sponge iron;The bottom plate is distributed with multiple air-permeable anti-seepage structures, and the bottom plate includes bottom layer and cushion layer, the bottom layer is reinforced concrete layer, and the cushion layer is sand-free large-pore concrete layer;The air-permeable anti-seepage structure includes, from top to bottom, air-permeable layer, protection layer, anti-seepage layer and leveling layer, the air-permeable layer is composed of air-permeable material, the protection layer is composed of thick river sand, the anti-seepage layer is composed of sand-based air-permeable anti-seepage active composite material, and the leveling layer is composed of sand;The sand-based air-permeable anti-seepage active composite material includes, by mass fraction: 1600 parts of aggregate, 0.3 parts of dodecyl trimethoxysilane, 8 parts of aliphatic hydrocarbon resin and 17 parts of polytetrafluoroethylene;Among them, the aggregate is a mixture of sintered ceramic sand with a size of 825-600 μm and sintered ceramic sand / yellow sand with a size of 212-150 μm in a weight ratio of 2:1;The distribution ratio of the air-permeable anti-seepage structure in distribution pool, purification pool and oxidation preservation pool is 1:2:1-2. 2.The sponge city rainwater collection and utilization sand-based microbead technology self-cleaning system according to claim 1, characterized in that: The bottom of the distribution pool has a recess to form a sedimentation area, and the upper portion is provided with a first inspection well formed by nano-biozyme sand-based microbead composite water filtration block stacking;The side wall of the distribution pool is provided with a ladder, which extends from the first inspection well to the sedimentation area. 3.The sponge city rainwater collection and utilization sand-based microbead technology self-cleaning system according to claim 1, characterized in that: The bottom of the oxidation fresh-keeping pool is provided with a recess to form a pumping area, a lifting pump is arranged in the pumping area, and a water outlet of the lifting pump is connected with a water outlet pipe; a second inspection well is arranged on the upper part of the oxidation fresh-keeping pool, and the second inspection well is formed by stacking nano-bio-enzyme sand-based micro-bead composite water filtering blocks; and an overflow pipe is arranged on the side wall of the oxidation fresh-keeping pool, and the overflow pipe is located above the water outlet pipe. 4.The sponge city rainwater collection and utilization system according to claim 1, characterized in that: The first and second partitions are respectively provided with water passing holes.

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