Sponge city rainwater collecting, purifying and utilizing combination system

Abstract

The invention discloses a sponge city rainwater collecting, purifying and utilizing combination system which comprises a roof rainwater collecting area, a road rainwater collecting area, a greenbelt rainwater collecting area, a water collecting and sand settling tank, a purifying device and an impounding reservoir. An evaporation preventing layer, a soil layer, a water supply layer and a purifying layer are sequentially arranged on the roof rainwater collecting area from top to bottom. Transverse and longitudinal water collecting pipes are arranged in a bottom gravel layer of the road rainwater collecting area. An evaporation preventing layer, a soil layer, a rough sand layer and a purifying layer are sequentially arranged in the greenbelt rainwater collecting area from top to bottom. A filtering grid is arranged in the middle of the impounding reservoir, a water inlet hole and a water overflow hole are formed in the upper portion of the impounding reservoir, and a water drawing pump is arranged at the bottom of the impounding reservoir. The city environment can be greened and beautified, city rainfall flood pressure can be relieved, pollutants in rainwater can be absorbed, water resources can be saved, the rainwater utilization efficiency can be improved, and important reference significance is achieved on sponge city non-point source pollution control and city water shortage relieving.

Description

technical field [0001] The invention belongs to the technical field of sponge city construction and rainwater resource utilization, and in particular relates to a comprehensive system for collecting, purifying and utilizing rainwater in a sponge city. Background technique [0002] my country is a country seriously short of water resources. According to statistics, among more than 600 cities in the country, more than 50% of the cities are short of water, and nearly 20% of the cities are seriously short of water. In recent years, with the rapid development of urbanization, the area of ​​urban green space has gradually decreased, and most of the green spaces, wetlands, ditches and other areas that originally had the function of water conservation have evolved into hardened ground. The drainage of the pipe network has caused frequent waterlogging disasters and serious runoff pollution; but after the heavy rain, it has fallen into the dilemma of dryness and water shortage, and th...

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Problems solved by technology

[0004] There are many deficiencies in conventional rainwater harvesting and utilization: conventional rainwater utilization technologies generally have a single function, such as rainwater collection, rainwater purification and other functions, without a good connection between various comprehensive functions, and without consideration of comprehensive intelligent management, the system does not operate well. Stable, cannot make full use of rainwater resources; natural rainwater often carries a large amount of domestic garbage and pollutants on the ground, and the unpurified rainwater is discharged into the natural environment, which will aggravate the pollution of natural water bodies; when encountering heavy rain, it will As a result, the urban surface runoff has increased significantly, and the flood discharge capacity of the municipal pipe network is far from sufficient, causing road floods and waterlogging; conventional rainwater purification systems often do not consider the purification process from the time of collecting rainwater, resulting in high purification costs and low purification efficiency

[0005] In summary, the current rainwater collection and utilization system can no longer meet the needs of sponge city construction. Therefore, it is necessary to combine the concepts of natural accumulation, natural infiltration and natural purification of sponge city to develop a system that can not only green and beautify the urban environment, but also It can also relieve the pressure of urban rain and flood, absorb pollutants in rainwater, and realize the rainwater collection and utilization system with comprehensive functions in order to realize energy-saving utilization of rainwater in sponge cities and control of urban non-point source pollution.

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