Biological retention system for rainwater purification and reuse

Abstract

The invention discloses a biological retention system for rainwater purification and reuse. The biological retention system comprises a rainwater garden and a landscape fountain; the rainwater garden sequentially comprises a vegetation layer, a covering layer, a filler layer, a geotechnical cloth layer, a supporting layer and a drainage layer from top to bottom; plants are planted on the filler layer, and the filter layer comprises soil, river sand, turfy soil, zeolite, vermiculite and excess sludge of waterworks; a fountain basin of the landscape fountain is sequentially provided with a disinfection layer, a water storage layer and a fountain layer from bottom to top, and a settling tank is arranged at the bottom of the fountain basin; an ultraviolet modulator tube is arranged on the disinfection layer, and the disinfection layer is connected with the drainage layer; and an immersible pump in the water storage layer supplies water in the water storage layer into a fountain water pipe to be sprayed out on the fountain layer. According to the biological retention system, a good environment can be provided for growth of the plants, pollutants in runoff of the rainwater are effectively removed, the rainwater serves as water for the landscape fountain after being purified, water for urban landscapes can be supplemented, and the municipal drainage pressure is relieved.

Description

technical field [0001] The invention belongs to the field of sponge city construction, and in particular relates to a rainwater purification and reuse biological retention system. Background technique [0002] The rapid development of urbanization has directly changed the nature and morphological characteristics of the underlying surface, aggravating the pollution of rainfall runoff, and carrying a large amount of pollutants (suspended solids, nitrogen, phosphorus, etc.) in the runoff, thus triggering a series of urban water environment problems. Among them, the eutrophication and black and odor problems of urban rivers are particularly prominent. Bioretention facilities are widely used low-impact development facilities, which can effectively reduce and control the migration of runoff pollutants from the source. Bioretention facilities mainly use the joint action of plants, fillers and microorganisms to remove pollutants through physical, chemical and biological reactions. ...

AI Technical Summary

Problems solved by technology

At present, most bioretention facilities are divided into cover layer, planting soil layer, geotextile layer, filler layer, geotextile layer, support layer and drainage layer, with many layers and high operation and maintenance costs; in addition, low-impact development facilities The outlet water is subject to the restriction that the maximum dynamic water level from the bottom of the facility to the groundwater must be greater than 1m. Generally, direct infiltration is not allowed, and it needs to be collected uniformly and discharged into the municipal drainage pipe network

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