Bioretention pond structure containing metal construction waste compound filler layer

Abstract

The utility model discloses a bioretention pond structure containing a metal construction waste compound filler layer, which comprises a marginal area, a buffer area, a water storage layer, a planting soil layer, a compound filler layer body, a gravel layer, a perforated pipe and a drainage pipe, the marginal area is arranged on the outer side of the buffer area, the gravel layer is laid at the bottom of the inner side of the buffer area, and the perforated pipe is arranged on the outer side of the buffer area. And a compound filler layer body is laid on the upper side of the gravel layer. According to the bioretention pond structure containing the metal construction waste compound filler layer, construction waste can be turned into wealth, the big background of double carbon is met, the bioretention pond structure has good advantages in adaptability and ecological property, cost is low, maintenance cost is low, and compared with a traditional bioretention facility structure, the bioretention pond structure has the advantages of being simple in structure and convenient to use. The removal rates of nitrate nitrogen (NO3-N) and total phosphorus (TP) by the bioretention pond structure containing the metal construction waste compound filler layer reach 91% and 81%, the nitrogen removal amount of microorganisms is 78.2%, and enterobacter, klebsiella, pseudomonas, aspergillus flavus and the like account for 61.9% of the total microorganisms.

Description

Technical Field

[0001] The utility model relates to the technical field of sponge city facilities, in particular to a bioretention pond structure with a composite filler layer containing metal construction waste. Background Technique

[0002] Sponge city is a new generation of urban rain and flood management concept, which means that the city can be like a sponge and has good elasticity in adapting to environmental changes and coping with natural disasters brought by rainwater. It can also be called a "water elastic city". The international general term is "low impact development rainwater system construction". When it rains, it absorbs, stores, seeps, and purifies water. When needed, the stored water is released and utilized to realize the free migration of rainwater in the city.

[0003] The construction of a sponge city is a complex and long-term process. During the construction of a sponge city, the principles of ecological priority should be followed, combining natural approaches with artificial measures. On the premise of ensuring the safety of urban drainage and flood prevention, the systematicness of natural precipitation, surface water, and groundwater should be coordinated, and all links of water cycle utilization such as water supply and drainage should be coordinated to maximize the accumulation, infiltration, and purification of rainwater in the urban area, and promote the utilization of rainwater resources and ecological environment protection.

[0004] A bioretention pond refers to a facility that stores, infiltrates, and purifies runoff rainwater through a plant, soil, and microorganism system in a low-lying area. It is a widely used decentralized low impact facility. Its main function is to store, infiltrate, and purify water when it rains, and at the same time, it can provide green landscape value and has good practicability. Currently, it is adopted as a conventional technology in sponge city project applications. However, the current conventional bioretention ponds mainly tend to absorb and release rainwater, and are particularly prominent in alleviating runoff flood peaks, but ignore the purification effect on the highly polluted initial rainfall runoff.

[0005] At the same time, the generation amount of construction waste is increasing year by year, which has caused serious impacts on the environment and resources. Only in China, the amount of construction waste generated each year exceeds 1 billion tons, and most of it has not been effectively treated and utilized. The main disposal methods are open stacking or simple landfill. This treatment method not only causes huge waste of resources, but also pollutes the soil, atmosphere, and groundwater unconsciously. Therefore, the importance of reasonably classifying and utilizing construction waste has become increasingly prominent. For this reason, a bioretention pond structure with a composite filler layer containing metal construction waste is designed to meet the needs of construction waste recycling. Content of the Utility Model

[0006] The purpose of the utility model is to provide a bioretention pond structure with a composite filler layer containing metal construction waste to solve the problems raised in the above background technique.

[0007] To achieve the above object, the utility model provides the following technical solution: A bioretention pond structure with a composite filler layer containing metal construction waste, including an edge area, a buffer area, a water storage layer, a planting soil layer, a composite filler layer body, a gravel layer, a perforated pipe, and a drain pipe. The edge area is arranged outside the buffer area. The bottom inside the buffer area is paved with a gravel layer. The upper side of the gravel layer is paved with a composite filler layer body. The upper side of the composite filler layer body is paved with a planting soil layer. Emergent plants are planted on the planting soil layer. Moisture-loving herbaceous plants are planted on the top of the buffer area. Terrestrial herbaceous plants are planted on the top of the edge area.

[0008] Preferably, the height of the edge area is higher than the water surface height of the water storage layer, and the depth of the water storage layer is 10 cm - 30 cm.

[0009] Preferably, the planting soil layer is composed of 60% - 75% sand, 2% - 8% organic matter, and 17% - 20% clay.

[0010] Preferably, the composite filler layer body includes metal-containing construction waste, red soil, and straw. The volume ratio of metal-containing construction waste, red soil, and straw is 1:1:2. The landfill sequence is metal-containing construction waste, red soil, and straw in turn. At the same time, a permeable geotextile is laid between different materials.

[0011] Preferably, the specification of the permeable geotextile is 200 - 300 g / m2.

[0012] Preferably, the thickness of the gravel layer is 20 cm - 30 cm, and it is composed of gravel with a diameter of 10 mm - 50 mm.

[0013] Preferably, the material of the perforated pipe is PVC. The perforated pipe is arranged inside the composite filler layer body, and the bottom of the perforated pipe is higher than the bottom of the composite filler layer body.

[0014] Preferably, the drain pipe is arranged in the gravel layer at the upper part of the buffer area, and the drain pipe is connected to the municipal drainage network.

[0015] Compared with the prior art, the beneficial effect of the utility model is: The bioretention pond structure with a composite filler layer containing metal construction waste can turn construction waste into treasure, which conforms to the background of "dual carbon". It has good advantages in adaptability and ecology, with low cost and low maintenance cost. Compared with the traditional bioretention facility structure, the bioretention pond structure with a composite filler layer containing metal construction waste has a removal rate of nitrate nitrogen (NO3--N) and total phosphorus (TP) reaching 91% and 81% respectively. Among them, the amount of nitrogen removed by microorganisms is 78.2%, and genera such as Enterobacter, Klebsiella, Pseudomonas, and Aspergillus flavus account for 61.9% of the total microorganisms. Description of the Drawings

[0016] Figure 1 Schematic diagram of the bioretention pond structure with a composite filler layer containing metal construction waste for the present utility model;

[0017] Figure 2 Schematic diagram of the composition structure of the composite filler layer for the present utility model.

[0018] In the figure: 1, edge area; 2, buffer zone; 3, water storage layer; 4, planting soil layer; 5, composite filler layer body; 6, gravel layer; 7, perforated pipe; 8, drain pipe; 9, emergent plants; 10, hygrophytic herbaceous plants; 11, terrestrial herbaceous plants; 12, metal-containing construction waste; 13, red soil; 14, straw; 15, permeable geotextile. Specific implementation manners

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0020] Please refer to Figure 1 - Figure 2 , the present utility model provides a technical solution: a bioretention pond structure with a composite filler layer containing metal construction waste, including an edge area 1, a buffer zone 2, a water storage layer 3, a planting soil layer 4, a composite filler layer body 5, a gravel layer 6, a perforated pipe 7 and a drain pipe 8. The edge area 1 is arranged outside the buffer zone 2. A gravel layer 6 is laid at the inner bottom of the buffer zone 2. A composite filler layer body 5 is laid on the upper side of the gravel layer 6. A planting soil layer 4 is laid on the upper side of the composite filler layer body 5. Emergent plants 9 are planted on the planting soil layer 4. Hygrophytic herbaceous plants 10 are planted on the top of the buffer zone 2. Terrestrial herbaceous plants 11 are planted on the top of the edge area 1.

[0021] The height of the edge area 1 is higher than the water surface height of the water storage layer 3, and the depth of the water storage layer 3 is 10 cm - 30 cm. Through the above settings, plants can be reasonably configured to provide a good habitat environment for insects and birds;

[0022] The planting soil layer 4 is composed of 60% - 75% sand, 2% - 8% organic matter and 17% - 20% clay. The slope of the planting soil layer 4 and the buffer slope of the buffer zone 2 is less than 1:4, providing a living environment for various animals in the ecological environment. The thickness of the planting soil layer 4 is not less than 25 cm, which is brown loam with a clay content < 10%, suitable for the growth of herbaceous plants;

[0023] The composite filler layer body 5 includes construction waste containing metal 12, red soil 13 and straw 14, and the volume ratio of the construction waste containing metal 12, red soil 13 and straw 14 is 1:1:2. The landfill sequence is the construction waste containing metal 12, red soil 13, and straw 14 in turn. At the same time, a permeable geotextile 15 is laid between different materials. Through the action of the composite filler layer body 5, heterotrophic nitrification-aerobic denitrifying bacteria can be enriched to remove nitrate nitrogen (NO3-) in water. Among them, the main microorganisms in the composite filler layer body 5 are genera Enterobacter, Klebsiella, Pseudomonas, and Aspergillus, etc. And the construction waste containing metal 12 contains a large amount of calcium (Ca), iron (Fe), and aluminum (Al), which form Ca-P, Fe-P, and Al-P with phosphorus (P) in the runoff, achieving the effect of removing P in water. And because the red soil 13 and straw 14 are weakly alkaline, they have a synergistic effect on reducing the pH value of the effluent, and can reduce the pH value from 11.86 to 7.75, effectively solving the problem of increased pH caused by the construction waste containing metal 12. At the same time, after the implementation of the composite filler layer body 5, there is no filler blockage, and it can still achieve the function of "rapid infiltration". Therefore, this bioretention pond structure can relieve rainwater runoff in a reaction system while completing the removal of pollutants in water, removing nitrate nitrogen and total phosphorus in the runoff, reducing the pollutants entering natural water bodies, and reducing greenhouse gas emissions. The detection method of the composite filler layer body 5 is as follows: The device is composed of an acrylic board with a length of 20 cm, a width of 20 cm, and a height of 30 cm. The wastewater used in the experiment is artificially prepared with KNO3 and KH2PO4, the total nitrogen (TN) is 38.09 - 54.60 mg / L, and the total phosphorus (TP) is 0.60 - 1.09 mg / L. The influent flows into the bottom water container after passing through the substrate, and the water mixed sample is taken for water quality detection;

[0024] The specification of the permeable geotextile 15 is 200 - 300 g / m2;

[0025] The thickness of the gravel layer 6 is 20 cm - 30 cm, and it is composed of gravel with a diameter of 10 mm - 50 mm. During the laying process of the gravel layer 6, the particle size of the lower layer should be smaller than that of the upper layer. Through the combination of different particle sizes, leakage phenomena can be avoided;

[0026] The material of the perforated pipe 7 is PVC, and the perforated pipe 7 is arranged in the composite filler layer body 5, and the bottom of the perforated pipe 7 is higher than the bottom of the composite filler layer body 5;

[0027] The drain pipe 8 is arranged in the gravel layer 6 at the upper part of the buffer zone 2, and the drain pipe 8 is connected to the municipal drainage network;

[0028] For the selection of emergent plants 9, pollution tolerance and drought resistance are considered, and the survival conditions conform to the local climate. Moreover, the following requirements must be met for the three types of plants: emergent plants 9, hygrophytic herbaceous plants 10, and terrestrial herbaceous plants 11. Native plants are preferred, which have a certain degree of pollution tolerance; plants with well-developed roots and strong purification ability are preferably selected; plants with certain ornamental attributes are chosen to consider the overall aesthetics of the rain garden.

[0029] According to the above-described bioretention pond structure, pollutants in rain runoff can be effectively removed, and animals such as birds and insects can be attracted to increase species richness. The utility model not only has good advantages in adaptability and ecology, can remove high-concentration pollutants, but also has low maintenance costs, which meets the goal of "carbon reduction" under the background of "dual carbon". It can effectively promote the concept of sponge city and enable more people to understand the functions and significance of sponge city.

[0030] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bioretention pond structure containing a composite filler layer of metal construction waste, comprising an edge zone (1), a buffer zone (2), an aquifer (3), a planting soil layer (4), a composite filler layer body (5), a gravel layer (6), a perforated pipe (7) and a drainage pipe (8), characterized in that: The edge zone (1) is arranged outside the buffer zone (2); a gravel layer (6) is laid on the bottom of the inner side of the buffer zone (2); a composite filler layer body (5) is laid on the upper side of the gravel layer (6); a planting soil layer (4) is laid on the upper side of the composite filler layer body (5); emergent plants (9) are planted on the planting soil layer (4); wetland herbaceous plants (10) are planted on the top of the buffer zone (2); and terrestrial herbaceous plants (11) are planted on the top of the edge zone (1); the composite filler layer body (5) comprises metal-containing construction waste (12), red soil (13) and straw (14); the volume ratio of the metal-containing construction waste (12), red soil (13) and straw (14) is 1:1:2, and the landfill order is metal-containing construction waste (12), red soil (13) and straw (14); and a permeable geotextile (15) is laid between the different materials.

2. A bioretention pond structure containing a metal construction waste composite filler layer according to claim 1, characterized in that: The height of the edge zone (1) is higher than the water surface height of the aquifer (3), and the depth of the aquifer (3) is 10 cm-30 cm.

3. The bioretention pond structure containing a metal construction waste composite filler layer according to claim 1, characterized in that: The specification of the permeable geotextile (15) is 200-300g / m2.

4. The bioretention pond structure containing a composite filler layer of metal construction waste according to claim 1, characterized in that: The gravel layer (6) has a thickness of 20 cm to 30 cm and is composed of gravels with a diameter of 10 mm to 50 mm.

5. The bioretention pond structure containing a composite filler layer of metal construction waste according to claim 1, characterized in that: The material of the perforated tube (7) is PVC, and the perforated tube (7) is arranged in the compound filler layer body (5), and the bottom of the perforated tube (7) is higher than the bottom of the compound filler layer body (5).

6. The bioretention pond structure containing a composite filler layer of metal construction waste according to claim 1, characterized in that: The drainage pipe (8) is arranged in the gravel layer (6) at the upper part of the buffer zone (2), and the drainage pipe (8) is connected to the municipal drainage network.

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