Ecological unit control method and device for urban rainwater runoff pollutants

Abstract

The invention discloses an ecological unit control method and device for urban rainwater runoff pollutants. The method includes separating garbage and suspended substances in rainwater runoff by a solid-liquid separation device; pumping the rainwater runoff into a sewage treatment tank; precipitating and decomposing harmful substances in sewage by the sewage treatment tank; discharging the purified rainwater to a water seepage layer; and finally filtering and purifying the rainwater by the water seepage layer. The device comprises the solid-liquid separation device, the sewage treatment tank and the water seepage layer, wherein the solid-liquid separation device comprises an outer barrel shell, a motor, a rotary shaft and a rotary hollow barrel. The separation of the rainwater runoff fromlarge particle solids is adopted, then the harmful substances such as phosphorus, nitrogen and the like are removed in the rainwater runoff by an aeration biological tank, and finally, phenol, cyanogen and sulfide in water are removed by a photo-oxidation reaction and a flocculation reaction of a three-stage treatment tank, so that the water seepage layer not only filters the rainwater, but also avoids soil erosion.

Description

technical field [0001] The invention relates to the field of urban rainwater pollutant management, in particular to an ecological unit control method and device for urban rainwater runoff pollutants. Background technique [0002] With the rapid development of urbanization in my country, water problems such as prominent contradictions between supply and demand of urban water resources, deterioration of water environment, and serious flood disasters have increasingly become important factors restricting the sustainable development of cities in my country. As an important part of the urban catchment surface, roads are also one of the main sources of non-point source pollution in urban water bodies. [0003] With the increase of urban impervious ground, the pollution of receiving water bodies by urban surface runoff has attracted more and more attention. The pollutants of road rainwater mainly come from tire wear, antifreeze use, vehicle leakage, pesticide and fertilizer use, d...

AI Technical Summary

Problems solved by technology

[0006] (1) Most of them use fence nets, seepage bricks or grasslands to intercept garbage pollutants in rainwater runoff, but garbage is easy to float on grasslands or be blocked in front of fence nets, which affects the appearance of the environment and removes pollutants in rainwater The efficiency is low, and the soil is easily lost due to heavy rain, and the filtering effect of turf and seepage bricks is poor;

[0007] (2) Much of the existing rainwater runoff flows directly to municipal sewers or roadsides, thereby infiltrating into groundwater directly. Although the large particles in the rainwater runoff are filtered by soil or stones, there are still some organic substances dissolved in water in the rainwater runoff or toxic elements. After people use or use groundwater polluted by rainwater runoff, it will pose a threat to human life, and rainwater that washes roofs and roads often carries harmful substances. When rainwater runoff floods grasslands, it will affect grass or trees The growth environment poses a threat to the ecological balance of nature

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