A rainwater treatment method based on a stepped garden

Abstract

The invention discloses a rainwater treatment method based on a stepped garden. In the method, a multi-level rainwater garden arranged in steps is adopted, and rainwater is introduced into the rainwater garden and flows through a high-level rainwater garden and a low-level rainwater garden in sequence to realize rainwater treatment. , which is characterized in that the rainwater is first led to the bottom of the high-level rain garden, so that the rainwater flows from the bottom of the high-level rain garden from bottom to top, and then converges from the top of the high-level rain garden and then falls from the edge into the low-level rain garden, from the inside of the low-level rain garden Flow from top to bottom to achieve filtration. The invention can realize multiple rainwater treatment methods, can comprehensively remove pollutants such as COD, TN, TP, and TSS in rainwater, and has an excellent removal effect on nitrogen (organic substances such as humus mixed in rainwater), and enhances the rain garden’s impact on The removal ability of Zn, Cd, Pb, Ni, Cr and other heavy metal ions and the enhanced rainwater retention ability make it suitable for the needs of mountainous cities.

Description

technical field [0001] The invention relates to the technical field of rainwater gardens used in sponge city construction, in particular to a rainwater treatment method based on stepped gardens. Background technique [0002] Sponge city is a new generation of urban stormwater management concept. It means that the city can be like a sponge and has good flexibility in adapting to environmental changes and responding to natural disasters caused by rainwater. It can also be called a "water elastic city". Considering how to deal with rainwater is a key factor in the construction of sponge city. [0003] Rain gardens are naturally formed or artificially excavated shallow concave green spaces that are used to gather and absorb rainwater from roofs or ground, and through the combined action of plants and sand, the rainwater is purified and gradually infiltrated into the soil, conserving groundwater, or It can be used to supply urban water such as landscape water and toilet water. ...

AI Technical Summary

Problems solved by technology

[0005] But this existing patented technology still has the following defects: 1. Rainwater infiltrates from top to bottom in gardens at all levels, and the rainwater retention time is shorter, and the treatment effect is relatively poor. Rainwater cannot infiltrate into the ground in time, and the underground soil is not fully developed. water storage

2 The rainwater treatment methods in gardens at all levels are aerobic and then anaerobic treatment processes. The relatively simple treatment method results in poor water treatment effects. At the same time, the poor sewage and oxygen binding capacity during aerobic treatment will also reduce the treatment effect

3 This kind of rain garden has an average removal effect on the main pollutants COD, TN, TP, TSS, etc. and heavy metal ions such as Zn, Cd, Pb, Ni, Cr, etc. in the rainfall runoff of Chongqing and other mountainous cities.

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