A green roof and rainwater purification coupling system for sponge city construction

Abstract

The invention relates to a green roof and a rainwater purification coupling system for sponge city construction, comprising a green roof and an automatic sand filter filtration and purification device; the green roof includes a planting device and a drainage device, wherein the planting device includes plants and matrix layer planting soil , filter layer, permeable geotextile, storage and drainage board; the drainage device includes waterproof structure, roof gutter and roof drain pipe; Filter inlet pipes, discarded rainwater discharge pipes and purification ponds. After the rainwater is absorbed and preliminarily purified by the green roof, the surface runoff flows into the roof gutter, and then passes through the downpipe of the roof gutter and is filtered through a sundry filter. The sand filter enters the water distribution well and the purification tank for further purification and recycling. Compared with the prior art, the invention has the advantages of strong rainwater purification ability, low cost, convenient use and the like.

Description

technical field [0001] The invention relates to the technical field of sponge city construction, in particular to a novel green roof for sponge city construction. Background technique [0002] "Sponge city" means that the city, like a sponge, has good "elasticity" in adapting to environmental changes and responding to natural disasters. It can absorb, store, infiltrate, and purify water when it rains. Water is "released" and used. Its essence is to use measures such as "seepage, stagnation, storage, purification, utilization, and drainage" to control the amount of water, peak reduction, pollution reduction, and resource utilization of urban rainfall runoff. In the low-impact development stormwater system, gardens are usually built on the roof to improve the urban ecological environment. Green roof gardens also play an important role in purifying the air and enriching the urban landscape. [0003] Green roofs are also known as planted roofs, green roofs, etc. Green roofs ar...

AI Technical Summary

Problems solved by technology

[0008] Most of the green roof technical solutions that have been announced so far rely solely on the water storage and purification function of the green roof system itself. After collecting and purifying rainwater, it is used to irrigate the roof green belt or for residents to flush toilets, etc. The water quality requirements are not high. However, this kind of system has high cost and poor implementability. On the one hand, it is because of the existing green roof’s ability to remove suspended solids, organic pollutants and nitrogen and phosphorus contained in rainwater, especially initial rainwater surface runoff. insufficient

In the actual use process, some light debris or sand and solid debris on the roof can easily flow into the aquifer of the green roof with the rainwater, which will easily cause the aquifer to be blocked during the infiltration process, resulting in permeable water. The performance is degraded, and timely flushing and maintenance are required and maintenance is difficult; on the other hand, the key to the success of a green roof lies in maintaining good permeability of the overall structure, while the current overall structure of the green roof has poor permeability and can purify rainwater. The capacity is not strong, and the survival rate of green roof vegetation is not high, resulting in increased maintenance costs

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