Initial rainwater purification pond for lane-side zoned concave green land

Abstract

The utility model discloses an initial rainwater purification pond for a lane side zoning concave green land, which comprises a water inlet I connected with a motor vehicle lane and a water inlet II connected with a non-motor vehicle lane / sidewalk, and the water inlet I and the water inlet II are respectively arranged on curbstones of corresponding road surfaces. The purification tank further comprises a settling area, a first-stage purification area and a second-stage purification area which are sequentially connected, the bottom of the settling area is formed by paving water permeable bricks, the bottom of the first-stage purification area is backfilled with an adsorption filter layer, a first filter layer is arranged below the adsorption filter layer, and the bottom of the second-stage purification area is backfilled with a second filter layer. A water storage and retention purification base material layer is arranged below the second filter layer, a water inlet I is connected with the settling zone, and a water inlet II is connected with the second-stage purification zone. According to the device, silt and various pollutants mixed in initial rainwater can be effectively reduced, polluted snow melting water generated after snow melting agents are used in winter can be stored and purified, and pollution and damage to greenbelts and plants can be reduced.

Description

Technical Field

[0001] This utility model belongs to the field of urban sewage treatment technology, and specifically relates to an initial rainwater sedimentation and filtration purification pond for the sunken green space in the median strip of a driveway. Background Technology

[0002] Currently, roads account for 8-20% of urban construction land in my country, and their runoff pollution is significant, with a particularly prominent impact on urban water environments. Traditional design concepts are no longer sufficient to meet the requirements of sponge city construction. Adopting the new ecological concept of sponge cities in road design has yielded significant results. However, in the initial construction phase, road median strip green spaces are often directly designed as sunken green areas. Road rainwater is directly introduced into the green belt through perforated curbs, causing long-term erosion of plants at the inlet, exposing topsoil, and accumulating pollutants such as leaves, garbage, and silt at the curb perforations. Furthermore, due to the severe pollution of initial rainwater from urban roads, containing pollutants such as heavy metals and microplastics, coupled with the use of de-icing agents in northern cities during winter, plants within the green belts suffer serious damage. Therefore, effective treatment of initial rainwater and road de-icing is necessary to prevent untreated rainwater from damaging green spaces and plants, and to protect urban water ecology and the water environment. Utility Model Content

[0003] This utility model provides an initial rainwater purification pond for sunken green spaces in the median strip of a roadway to solve the technical problems existing in the prior art. It can reduce the pollution and damage to green spaces and plants caused by initial rainwater and winter de-icing agents, and prevent rainwater runoff and winter de-icing agents from polluting the urban water ecology and water environment.

[0004] The technical solution adopted by this utility model to solve the technical problems existing in the prior art is: an initial rainwater purification pond for a sunken green space in the median strip of a roadway. The purification pond is set in the sunken green space located between the motor vehicle lane and the non-motor vehicle lane / pedestrian lane, with the same width as the green belt. It includes an inlet I connected to the motor vehicle lane and an inlet II connected to the non-motor vehicle lane / pedestrian lane. The inlet I and the inlet II are respectively set on the curb stones of the corresponding road surface. The purification pond also includes a sedimentation zone, a first-stage purification zone and a second-stage purification zone connected in sequence. The bottom of the sedimentation zone is paved with permeable bricks. The bottom of the first-stage purification zone is backfilled with an adsorption filter layer, and a first filter layer is provided below the adsorption filter layer. The bottom of the second-stage purification zone is backfilled with a second filter layer, and a water-retaining and purification substrate layer is provided below the second filter layer. The inlet I is connected to the sedimentation zone and the inlet II is connected to the second-stage purification zone.

[0005] The permeable bricks are sand-based permeable bricks.

[0006] The adsorption filter layer is made of volcanic rock with a pore size of 3-5 mm and a thickness of 200-300 mm.

[0007] The first filter layer is made of pebbles with a particle size of 5-10mm and a thickness of 140-160mm.

[0008] The second filter layer is made of pebbles with a particle size of 5-10mm and a thickness of 80-120mm.

[0009] The thickness of the water-retaining and purifying substrate layer is 200-400mm.

[0010] The water inlet I and the water inlet II are formed by setting notches on the corresponding side stones.

[0011] The purification tank is divided into different purification zones by partition walls, which are constructed using granite side stones.

[0012] The sedimentation zone and the first-level purification zone are located on one side, and the second-level purification zone is located on the other side. They are of equal width, each being 0.5 times the width of the green belt. The length of the sedimentation zone is 1.2-1.6 times that of the first-level purification zone, and the sum of the lengths of the sedimentation zone and the first-level purification zone is equal to the length of the second-level purification zone.

[0013] The advantages and positive effects of this utility model are as follows: Compared with the prior art, the addition of a rainwater sedimentation and purification filtration pond in the traditional sunken green space design solves the problem of initial rainwater pollution of the green space. On the one hand, at the beginning of rainfall, the initial rainwater from the motor vehicle lanes first flows into the sedimentation area. The sand-based permeable bricks can intercept and remove large particles of pollutants and silt. In winter, it can store and purify polluted snowmelt containing road de-icing agents, and this area can also act as a buffer to prevent the green space from being washed away. On the other hand, as rainfall increases and the sedimentation area is full, the rainwater can enter the two-stage purification zone to purify and remove pollutants such as SS (suspended solids) and COD from the rainwater, preventing rainwater runoff pollution from damaging the plants in the sunken green space. This utility model has a simple structure, concentrated functions, and wide applicability. It is suitable for various forms of green belts, and the filling material can be adjusted according to the road pollution situation in different areas. It is suitable for promotion and use in sunken green spaces in sponge city projects, especially for heavily polluted industrial parks and municipal roads in northern cities. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the planar structure of the present invention;

[0015] Figure 2 This is an elevation diagram of the present invention.

[0016] In the diagram: 1-1, Inlet I; 1-2, Inlet II; 2, Sedimentation zone; 3, First-stage purification zone; 4, Second-stage purification zone; 5, Partition wall. Detailed Implementation

[0017] To further understand the invention content, features, and effects of this utility model, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings:

[0018] Please see Figure 1 and Figure 2 An initial rainwater purification pond for a sunken green space in a median strip along a roadway is provided. The purification pond is located in a sunken green space between a motor vehicle lane and a non-motor vehicle lane / pedestrian lane, and is the same width as the green belt. It includes an inlet I1-1 connected to the motor vehicle lane and an inlet II1-2 connected to the non-motor vehicle lane / pedestrian lane. The inlet I1-1 and the inlet II1-2 are respectively located on the curb stones of the corresponding road surface.

[0019] The purification tank also includes a sedimentation zone 2, a first-stage purification zone 3, and a second-stage purification zone 4 connected in sequence. The bottom of the sedimentation zone 4 is paved with permeable bricks. The bottom of the first-stage purification zone 3 is backfilled with an adsorption filter layer, and a first filter layer is provided below the adsorption filter layer. The bottom of the second-stage purification zone 4 is backfilled with a second filter layer, and a water storage and purification substrate layer is provided below the second filter layer. The water inlet I1-1 is connected to the sedimentation zone 2, and the water inlet II1-2 is connected to the second-stage purification zone 4.

[0020] The aforementioned sedimentation zone is primarily used to settle sediment and intercept large pollutants in rainwater from motor vehicle lanes; it also stores contaminated snowmelt after the use of de-icing agents in winter, facilitating later cleanup. The first-stage purification zone is mainly used to remove suspended solids (SS) from the initial rainwater runoff from motor vehicle lanes. The second-stage purification zone is mainly used to further remove SS and COD pollutants from the initial rainwater runoff from both motor vehicle and non-motor vehicle lanes. Rainwater from motor vehicle lanes is heavily polluted and requires three steps of purification through the sedimentation zone and the two purification zones. Rainwater from non-motor vehicle lanes / pedestrian walkways is less polluted and only needs to pass through the second-stage purification zone before directly entering the sunken green space.

[0021] In this embodiment, the purification pool has a main body length of 1300mm, a width B that can be flexibly adjusted according to the width of the road green belt, a main body depth of 500mm, and a processing capacity of 40L / s.

[0022] The preferred embodiment is as follows:

[0023] The permeable bricks are made of sand-based permeable bricks, and the recommended size of the sand-based permeable bricks is 150mm×150mm×45mm.

[0024] The adsorption filter layer is made of volcanic rock with a pore size of 3-5 mm and a thickness of 200-300 mm; below it is a first filter layer of pebbles with a particle size of 5-10 mm and a thickness of 140-160 mm. The recommended thickness of the adsorption filter layer is 250 mm, and the recommended thickness of the first filter layer is 150 mm.

[0025] The second filter layer is made of pebbles with a particle size of 5-10mm and a thickness of 80-120mm. The lower layer is a water-retaining and purifying substrate with a particle size of 3-5mm and a thickness of 200-400mm. The recommended thickness of the second filter layer is 100mm, and the recommended thickness of the water-retaining and purifying substrate layer is 300mm.

[0026] The inlet I1-1 and inlet II1-2 are formed by setting notches on the corresponding side stones. Addressing the issue that the openings of the toothed side stones used in some cities are easily blocked by plastic bags, dead branches, etc., this embodiment adopts a structure with notches on the side stones. A recommended upper opening size is 600mm × 10mm, with a flow capacity greater than 20L / s.

[0027] The sedimentation zone 2 and the first-level purification zone 3 are located on one side, and the second-level purification zone 4 is located on the other side. Both have equal widths, each 0.5 times the width of the green belt. The length of the sedimentation zone 2 is 1.2-1.6 times that of the first-level purification zone, and the sum of the lengths of the sedimentation zone 2 and the first-level purification zone 3 is equal to the length of the second-level purification zone. Recommended dimensions are: sedimentation zone 2 600mm × 0.5 times the width of the green belt; and first-level purification zone 3 400mm × 0.5 times the width of the green belt.

[0028] The purification zones of this purification pool are separated by partition walls 5, which are constructed using granite side stones. The recommended dimensions for these granite side stones are 500mm high and 100mm wide. Strict control of the elevation of the roadside stones and granite side stones is required to ensure the purification pool functions effectively. For details regarding the elevation of the roadside stones and granite side stones in this embodiment, please refer to [link to relevant documentation]. Figure 2 .

[0029] The working principle of this utility model:

[0030] The aforementioned purification ponds are numerous and spaced out in the sunken green spaces along the roadside medians, similar to water collection wells. They should be located at the lowest points of the green space, with openings made at the corresponding curbs to form inlets I and II, sloping towards the median strip between the motor vehicle lanes and non-motorized vehicle lanes / pedestrian walkways. In the initial stages of rainfall, rainwater from the motor vehicle lanes flows into the sedimentation zone through inlet I. After sedimentation and filtration through permeable sand bricks, the rainwater infiltrates the soil. Once the sedimentation zone is full, the rainwater flows into the first and second-level purification zones for further purification before finally entering the sunken green space for storage. Rainwater from the non-motorized vehicle lanes / pedestrian walkways is less polluted and can flow directly into the second-level purification zone through inlet II before finally entering the sunken green space for storage. The sedimentation zone is cleaned monthly, and the permeable sand bricks are washed every six months. The fillers in the first and second-level purification zones are cleaned every six months.

[0031] The types and particle sizes of the fillers mentioned above can be adjusted according to the availability of local raw materials for different projects. For example, permeable bricks can be sand-based permeable bricks, ceramic permeable bricks, or a range of other permeable bricks; water storage and retention substrates can be granular activated carbon, etc.; adsorption and filtration layers can be made of volcanic rock or quartz sand. The particle size of the above materials should be determined based on the specific circumstances of the project.

[0032] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and these all fall within the protection scope of the present invention.

Claims

1. A preliminary rainwater purification tank for a lane-side strip undercut green, characterized by, The purification pool is arranged in a sunken green land between a motor vehicle lane and a non-motor vehicle lane / pedestrian lane, has the same width as a green belt, comprises a water inlet I connected with the motor vehicle lane and a water inlet II connected with the non-motor vehicle lane / pedestrian lane, and the water inlet I and the water inlet II are arranged on the kerb stones of the corresponding road surfaces respectively, The purification pool further comprises a sedimentation zone, a first-stage purification zone and a second-stage purification zone connected in sequence, the bottom of the sedimentation zone is paved with water-permeable bricks, the bottom of the first-stage purification zone is backfilled with an adsorbing filter layer, a first filter layer is arranged below the adsorbing filter layer, the bottom of the second-stage purification zone is backfilled with a second filter layer, and a water storage and preservation purification substrate layer is arranged below the second filter layer, the water inlet I is connected with the sedimentation zone, and the water inlet II is connected with the second-stage purification zone.

2. The preliminary rainwater purification tank for a lane-side strip-off concave greenery according to Claim 1, characterized by, The water-permeable bricks are sand-based water-permeable bricks.

3. The preliminary rainwater purification tank for a lane-side strip-off concave greenery according to Claim 1, characterized by, The adsorbing filter layer is paved with volcanic rocks with a pore size of 3-5 mm and a thickness of 200-300 mm.

4. The preliminary rainwater purification tank for a lane-side strip-off concave greenery according to claim 3, characterized by, The first filter layer is paved with pebbles with a particle size of 5-10 mm and a thickness of 140-160 mm.

5. The preliminary rainwater purification tank for a lane-side strip-off concave green according to claim 1, characterized by, The second filter layer is paved with pebbles with a particle size of 5-10 mm and a thickness of 80-120 mm.

6. The preliminary rainwater purification tank for a lane-side strip-off concave greenery according to claim 5, characterized by The water storage and preservation purification substrate layer has a thickness of 200-400 mm.

7. The preliminary rainwater purification tank for a lane-side strip-off concave green according to claim 1, characterized by, The water inlet I and the water inlet II are formed by setting openings in the corresponding kerb stones.

8. The preliminary rainwater purification tank for a lane-side strip-off concave green according to claim 1, characterized by, The purification pool is divided into different purification zones by partition walls, and the partition walls are formed by granite kerb stones.

9. The preliminary rainwater purification tank for a lane-side strip-off concave green according to claim 1, characterized by, The sedimentation zone and the first-stage purification zone are arranged on one side, and the second-stage purification zone is arranged on the other side, and the widths of the three zones are equal and are 0.5 times the width of the green belt, the length of the sedimentation zone is 1.2-1.6 times the length of the first-stage purification zone, and the sum of the length of the sedimentation zone and the length of the first-stage purification zone is equal to the length of the second-stage purification zone.

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