Green roof and rainwater purification coupling system for sponge city construction

Abstract

The invention relates to a green roof and rainwater purification coupling system for sponge city construction. The green roof and rainwater purification coupling system comprises a green roof and a sand filtration automatic filtration and purification device, wherein the green roof comprises a planting device and a drainage device, the planting device comprises plants, matrix layer planting soil,a filter layer, permeable geotechnical cloth and a water storage and drainage plate, the drainage device comprises a waterproofing structure, a roof ditch and a roof drainage pipe, and the sand filtration automatic filtration and purification device comprises a roof ditch sewer pipe, a sand filtration water inlet and distribution well, a sand filtration water inlet pipe, a discarded flow rainwaterdischarge pipe and a purification pool. Rainwater is absorbed and preliminarily purified by the green roof, then surface runoff is gathered into the roof ditch and then filtered by a sundry filter through the roof ditch sewer pipe, the initial rainwater is discharged into a municipal sewage pipe network through the discarded flow rainwater discharge pipe, and the later rainwater enters the sand filtration water inlet and distribution well and the purification pool to be further purified and then recycled; and compared with the prior art, the system has the advantages of being high in rainwater purifying capacity, low in cost, convenient to 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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