Functional rainwater garden applicable to sponge community

Abstract

The invention discloses a functional rainwater garden applicable to a sponge community. The functional rainwater garden comprises a pre-percolation layer, a water storage layer and an overflowing facility, wherein the pre-percolation layer comprises an annular edge slope arranged at the periphery of the garden; a zeolite-active carbon filtering system is laid on the annular edge slope; a part, far away from the garden, of the annular edge slope is higher than a part close to the garden; the water storage layer comprises a covering layer, a planting soil layer, a percolation layer and a filling layer which are arranged in sequence from top to bottom; an overflowing pipe of the overflowing facility penetrates into the water storage layer along the vertical direction; an overflowing hole of the overflowing facility is higher than the water storage layer. According to the functional rainwater garden, a multi-grade percolation system composed of the pre-percolation layer, an active carbon layer and the water storage layer has the effects of filtering, precipitating, permeating and adsorbing rainfall runoff, carrying out ion exchange, biodegradation and plant absorption and the like, and pollutants including heavy metal, organic matters, nitrogen and phosphorus and the like in the runoff are reduced, so that absorption and purification of the runoff are realized; water for greenbelts is reduced, and urban waterlogging and municipal drainage pressure are alleviated; a heat island effect is alleviated and an ecological city is constructed.

Description

technical field [0001] The invention relates to a functional rainwater garden suitable for sponge communities, and belongs to the technical field of rainwater runoff pollution control. Background technique [0002] With the continuous acceleration of urbanization, the problems of urban waterlogging, initial rainwater pollution and black and smelly rivers are becoming more and more serious. The water system in the city continues to decrease, and the impermeable area of ​​the underlying surface increases, resulting in the inability of rainfall runoff to infiltrate through the ground, resulting in serious waterlogging within the city after the formation of stagnant water. At the same time, rainwater runoff scours the road surface and carries pollutants such as high concentrations of heavy metals, hydrocarbon organic matter, nitrogen and phosphorus, and will also cause initial rainwater pollution. Existing studies have shown that the discharge of various pollutants has caused g...

AI Technical Summary

Problems solved by technology

However, there are many pollutants in rainwater, the composition is complex, and the soil’s ability to remove pollutants is limited. As a result, conventional rain gardens have low adsorption capacity for some high-concentration heavy metals or organic matter, so that the water body containing pollutants can penetrate the soil filter layer and sand layer. Into the groundwater, causing groundwater pollution

[0005] The existing rain garden design mainly considers the effect of water storage and peak stagnation, and weakens the purification effect. The ability to remove heavy metals, organic matter and other pollutants in the initial rainwater is limited, and no effective strengthening treatment measures have been taken. High, the problem of re-pollution of clean water

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