Coastal green land rainwater utilization structure

Abstract

The utility model discloses a coastal green land rainwater utilization structure. The structure comprises a rainwater circulating well, and a planting layer, a filtering layer, a drainage layer and a salt discharge layer which are sequentially stacked from top to bottom. A water seepage pipe and a water collecting pipe are arranged in the salt discharging layer; the rainwater circulating well comprises a well body, a cylindrical mesh electrode, an ultraviolet lamp tube and a pipeline pump. The inner side wall of the well body is made of metal materials. And the ultraviolet lamp tube is mounted in the middle of the inner cavity of the well body. And the cylindrical mesh electrode surrounds the periphery of the ultraviolet lamp tube. The output port of the water collecting pipe, the input port of the pipeline pump and the municipal rainwater pipe network are connected through a reversing valve. The side wall of the well body and the cylindrical mesh electrode are respectively connected to a negative electrode and a positive electrode of an external power supply. According to the municipal rainwater treatment system, high-conductivity water can be fed into a municipal rainwater pipe network, low-conductivity water is fed into the rainwater circulating well for optical / electric synergistic oxidation treatment, and treated rainwater is used as a landscape water supplementary water source, so that the dependence on a municipal water source is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of rainwater utilization, and particularly relates to a rainwater utilization structure for coastal green spaces. Background Art

[0002] In coastal areas, due to their special geographical and environmental conditions, greening planting faces many severe challenges. In addition to the original basic soil structure being unfavorable for plant growth, lacking sufficient fertility and good air permeability and being difficult to meet the growth requirements of greening plants, the influence of seawater is a key issue.

[0003] Seawater will continuously rise to the soil surface through the capillary action of the soil, resulting in an increased degree of soil salinization. This salinization phenomenon seriously damages the physical and chemical properties of the soil, causing the soil pH to be unbalanced and nutrients to be lost, thus causing great harm to the roots of plants.

[0004] Although taking measures such as replacing the surface planting soil can reduce the negative impact of salinization in the short term, this is only a temporary solution. Because a large amount of salt stored in the underlying soil will still gradually rise to the surface by means of capillary action. Over time, the newly replaced soil will also quickly become salinized, thereby seriously inhibiting the growth of plants. This situation not only affects the greening effect and ecological landscape in coastal areas, but also increases the cost and difficulty of greening maintenance. Summary of the Invention

[0005] In order to meet the above requirements, the purpose of the utility model is to provide a rainwater utilization structure for coastal green spaces.

[0006] A rainwater utilization structure for coastal green spaces provided by the present invention includes a rainwater circulation well and a planting layer, a filtering layer, a drainage layer, and a salt drainage layer that are stacked in sequence from top to bottom. A drainage and infiltration pipe is provided in the salt drainage layer; the drainage and infiltration pipe is connected to a water collecting pipe; the rainwater circulation well includes a well body, a cylindrical mesh electrode, an ultraviolet lamp tube, and a pipeline pump. The inner side wall of the well body is made of a metal material.

[0007] The ultraviolet lamp tube is installed in the middle of the inner cavity of the well body. The cylindrical mesh electrode surrounds the ultraviolet lamp tube. The output port of the water collecting pipe, the input port of the pipeline pump, and the municipal rainwater pipe network are connected through a reversing valve. The side wall of the well body and the cylindrical mesh electrode are respectively connected to the negative electrode and the positive electrode of an external power supply.

[0008] Preferably, the cylindrical mesh electrode adopts a Ti / Ru composite electrode, which includes an electrode substrate made of a cylindrical titanium mesh and a ruthenium layer coated on the electrode substrate. A titanium dioxide protective layer is provided on the electrode substrate between the electrode substrate and the ruthenium layer.

[0009] Preferably, non-woven geotextiles are laid under both the coarse sand layer and the salt drainage layer.

[0010] Preferably, a layer of natural bentonite waterproof blanket is also laid under the coarse sand layer.

[0011] Preferably, the drainage and infiltration pipes are arranged in a grid pattern, with a pipe spacing of 8 m to 10 m and a slope drop of 0.3% to 0.4%; the slope drop of the water collecting pipe is 0.15% to 0.25%.

[0012] Preferably, a conductivity meter is installed at the outlet of the water collecting pipe.

[0013] Preferably, a manhole cover is provided on the top opening of the well body. An outlet higher than the planting layer is provided at the top of the side wall of the well body.

[0014] Preferably, the thickness of the planting layer is greater than or equal to 600 mm;

[0015] Preferably, the thickness of the filter layer is greater than or equal to 300 mm and is filled with bottom sediment filter materials with a particle size of 6 mm to 8 mm. The thickness of the coarse sand layer is greater than or equal to 50 mm.

[0016] Preferably, the thickness of the drainage layer is greater than or equal to 200 mm and is filled with gravel with a particle size of 20 mm to 40 mm; the thickness of the salt drainage layer is greater than or equal to 300 mm and is filled with bottom sediment filter materials with a particle size of 8 mm to 10 mm.

[0017] The beneficial effects of the present utility model are as follows:

[0018] The present utility model combines rainwater treatment in coastal green spaces with saline-alkali soil remediation. Among them, the drainage layer can isolate the rise of underground brine and drain it away through the drainage and infiltration pipes. The rainwater accumulated thereon can also leach the soil and drain away the salts in the soil. At the same time, the present utility model can send water bodies with high conductivity into the municipal rainwater pipe network, send water bodies with low conductivity into the rainwater circulation well for photo / electric synergistic oxidation treatment, and use the treated rainwater as a supplementary water source for the landscape water body, which will reduce the dependence on municipal water sources, achieve naturalness and ecology, and can save precious water resources.

[0019] In the rainwater circulation well of the present utility model, a cylindrical mesh electrode is set as the anode, and the inner wall of the rainwater circulation well is used as the cathode. Cooperating with the ultraviolet lamp tube arranged inside the cylindrical mesh electrode, efficient photo / electric synergistic oxidation treatment can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0021] Figure 2Schematic connection diagram of the drainage and infiltration pipe, water collection pipe and rainwater circulation well in the salt drainage layer of the present utility model.

[0022] Figure 3 Schematic internal structure diagram of the rainwater circulation well in the present utility model.

[0023] Among them, 1. planting layer; 2. filtration layer; 3. coarse sand; 4. drainage layer; 5. salt drainage layer; 6. non-woven geotextile; 7. drainage and infiltration pipe; 8. water collection pipe; 9. green space plants; 10. rainwater circulation well; 101. well cover; 102. well body; 103. cylindrical mesh electrode; 104. ultraviolet lamp tube; 105. water outlet. Specific implementation manners

[0024] The present utility model will be further described below with reference to the accompanying drawings.

[0025] As Figure 1 , Figure 2 and Figure 3 shown, a rainwater utilization structure for a coastal green space includes a rainwater circulation well 10 and a planting layer 1, a filtration layer 2, a coarse sand layer 3, a drainage layer 4 and a salt drainage layer 5 which are stacked in sequence from top to bottom. The rainwater circulation well 10 vertically penetrates through the planting layer 1, the filtration layer 2, the coarse sand layer 3, the drainage layer 4 and the salt drainage layer 5 in sequence.

[0026] In some embodiments, the planting layer 1 includes planting soil, decomposed organic fertilizer and mountain skin sand with a weight ratio of 2:1:2; which helps to increase soil fertility and soil acidity and is beneficial to the survival of plants; the thickness of the planting layer 1 is greater than or equal to 600 mm;

[0027] The plants 9 on the planting layer 1 are preferably native plants, and water and drought-tolerant plants with the characteristics of pollution resistance, salt and alkali tolerance, waterlogging tolerance and drought resistance are mainly selected, and pennisetum alopecuroides, arundo donax var. versicolor, lythrum salicaria and cyperus alternifolius are further preferably selected.

[0028] The thickness of the filtration layer 2 is 300 mm and is filled with bottom mud filter materials with a particle size of 6 - 8 mm. In some embodiments, the bottom mud filter materials are obtained by high-temperature roasting with river and lake bottom mud, bentonite, aquatic plant residues, straw, starch and limestone as raw materials.

[0029] The thickness of the coarse sand layer 3 is 50 mm.

[0030] The thickness of the drainage layer 4 is 200 mm and is formed by filling with gravel with a particle size of 20 - 40 mm, and the drainage layer 4 must be smoothly connected.

[0031] The thickness of the salt drainage layer 5 is 300 mm and it is formed by filling with bottom sediment filter media with a particle size of 8 - 10 mm. In the salt drainage layer 5, drainage and infiltration pipes 7 are laid along with the terrain undulation, and a slope - direction water collecting pipe 8 is also provided; the drainage and infiltration pipes 7 are connected to the water collecting pipe 8; the connection method between the drainage and infiltration pipes 7 and the water collecting pipe 8 is through a tee joint connection, or by drilling holes in the water collecting pipe 8 and inserting the drainage and infiltration pipes 7 into the water collecting pipe 8 and then winding and tying them tightly with non - woven fabric for fixation. The bottom elevation of the drainage and infiltration pipes 7 is higher than the groundwater level elevation, which plays the role of draining salt and preventing the upward return of saline - alkali; the drainage and infiltration pipes 7 adopt De63 PVC double - threaded infiltration pipes, and the cross - over parts are connected with matching tees and straight cross - joints. The pipe spacing is 8 m - 10 m, and the slope is 0.3%; the water collecting pipe adopts a DN200 pipe, and its slope is 0.2%, sloping towards the rainwater circulation well.

[0032] The non - woven geotextile 6 laid under the salt drainage layer 5 has a gram weight of 200 g / m 2 . Non - woven geotextiles 6 are laid under both the coarse sand layer 3 and the salt drainage layer 5; in some embodiments, due to the water retention or ornamental requirements of the landscape water system in some green spaces, a layer of natural bentonite waterproof blanket is also laid under the coarse sand layer 3 to isolate the upward return of underground brine and maintain the landscape water level; the drainage layer 4 and the salt drainage layer 5 on the lower side of the waterproof blanket can enhance the air permeability of the bottom layer of the landscape water system, prevent the waterproof blanket from bulging and deforming, and at the same time ensure the coherence and integrity of the overall salt drainage and drainage layer of the green space.

[0033] The rainwater circulation well 10 includes a well cover 101, a well body 102, a cylindrical mesh electrode 103, an ultraviolet lamp tube 104, a pipeline pump, a conductivity meter, and an outlet 105. The side wall material of the well body 102 is stainless steel. The well cover 101 is fixed on the top opening of the well body 102. The outlet 105 is arranged at the top of the side wall of the well body 102 and is higher than the planting layer 1. The ultraviolet lamp tube 104 is vertically installed in the middle of the inner cavity of the well body 102. The cylindrical mesh electrode 103 surrounds the ultraviolet lamp tube 104. The pipeline pump is installed at the bottom of the inner cavity of the well body 102.

[0034] The conductivity meter is installed at the outlet of the water collecting pipe 8. The outlet of the water collecting pipe 8, the inlet of the pipeline pump, and the municipal rainwater pipe network are connected through a reversing valve. The PLC automatic control system controls the switching of the reversing valve according to the conductivity value to realize the switching of the water flow direction; in some embodiments, when the conductivity is greater than 5 mS / m (a high conductivity indicates a high salt content and is not suitable for recycling), the water flow is discharged into the municipal rainwater pipe network, and when the conductivity does not exceed 5 mS / m, the water flow enters the rainwater circulation well 10.

[0035] The emission wavelength of the ultraviolet lamp tube 104 is 254 nm; an optical quartz glass sleeve is sleeved around the ultraviolet lamp tube 104. The cylindrical mesh electrode 103 adopts a Ti / Ru composite electrode, which includes an electrode substrate made of a cylindrical titanium mesh and a ruthenium layer coated on the electrode substrate. A titanium dioxide protective layer located between the electrode substrate and the ruthenium layer is provided on the electrode substrate.

[0036] The side wall of the well body 102 and the cylindrical mesh electrode 103 are respectively connected to the negative electrode and the positive electrode of an external power supply; the side wall of the well body 102 of the rainwater circulation well serves as the cathode, the cylindrical mesh electrode 103 serves as the anode, and the ultraviolet lamp tube 104 serves as the ultraviolet light source to construct a photo / electro-catalytic oxidation system.

Claims

1. A rainwater utilization structure for coastal green spaces, comprising a rainwater circulation well (10) and a planting layer (1), a filtering layer (2), a coarse sand layer (3), a drainage layer (4), and a salt drainage layer (5) that are stacked in sequence from top to bottom; characterized in that: A drain pipe (7) is provided in the salt drainage layer (5); the drain pipe (7) is connected to a water collecting pipe (8); the rainwater circulation well (10) includes a well body (102), a cylindrical mesh electrode (103), an ultraviolet lamp tube (104), and a pipeline pump; the inner side wall of the well body (102) is made of a metal material; The ultraviolet lamp tube (104) is installed in the middle of the inner cavity of the well body (102); the cylindrical mesh electrode (103) surrounds the ultraviolet lamp tube (104); the output port of the water collecting pipe (8), the input port of the pipeline pump, and the municipal rainwater pipe network are connected through a reversing valve; the side wall of the well body (102) and the cylindrical mesh electrode (103) are respectively connected to the negative electrode and the positive electrode of an external power source.

2. The rainwater utilization structure for coastal green space according to claim 1, wherein: The cylindrical mesh electrode (103) adopts a Ti / Ru composite electrode, which includes an electrode substrate made of a cylindrical titanium mesh, and a ruthenium layer coated on the electrode substrate; a titanium dioxide protective layer is provided on the electrode substrate between the electrode substrate and the ruthenium layer.

3. The rainwater utilization structure for coastal green space according to claim 1, characterized in that: An non-woven geotextile (6) is laid below the coarse sand layer (3) and the salt drainage layer (5).

4. The rainwater utilization structure for coastal green space according to claim 3, characterized in that: A layer of natural bentonite waterproof blanket is also laid below the coarse sand layer (3).

5. A rainwater utilization structure for coastal green spaces according to claim 1, characterized in that: The drain pipes (7) are arranged in a grid pattern, with a pipe spacing of 8m to 10m and a slope of 0.3% to 0.4%; the slope of the water collecting pipe is 0.15% to 0.25%.

6. The rainwater utilization structure for coastal green space according to claim 1, characterized in that: A conductivity meter is installed at the output port of the water collecting pipe (8).

7. The rainwater utilization structure for coastal green space according to claim 1, characterized in that: A manhole cover (101) is provided on the top opening of the well body (102); a water outlet (105) higher than the planting layer (1) is provided at the top of the side wall of the well body (102).

8. A rainwater utilization structure for coastal green space according to claim 1, characterized in that: The thickness of the planting layer (1) is greater than or equal to 600mm.

9. The rainwater utilization structure of a coastal green space according to claim 1, characterized in that: The thickness of the filter layer (2) is greater than or equal to 300mm and is filled with bottom sediment filter materials with a particle size of 6mm to 8mm; the thickness of the coarse sand layer (3) is greater than or equal to 50mm.

10. A rainwater utilization structure for coastal green spaces according to claim 1, characterized in that: The thickness of the drainage layer (4) is greater than or equal to 200mm and is filled with gravel with a particle size of 20mm to 40mm; the thickness of the salt drainage layer (5) is greater than or equal to 300mm and is filled with bottom sediment filter materials with a particle size of 8mm to 10mm.

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