Quality-graded collecting and purifying process and system for rainfall runoff

Abstract

The invention belongs to the technical field of treatment of city rainfall runoff, and in particular relates to a quality-graded collecting and purifying process and system for rainfall runoff. Firstly, the rainfall runoff on the ground surface flows into an intercepting pool through a rain well and a rain pipe, the early stage runoff stored in the intercepting pool is pumped into a sewage pipe network by a submersible sewage pump and flows to a sewage factory along with sewage; and the later stage runoff overflows and enters a percolating pool through an effluent weir, and is directly drained into the natural water body after being filtered and absorbed by a soil covering layer, a quartz sand layer, an anthracite layer and a pebble layer in the percolating pool. The seriously polluted early stage runoff and the lightly polluted later stage runoff can be effectively separated by the process and system, and the runoff flows to the respective treating units, and simultaneously, the later stage runoff is treated to achieve the water standard that treated later stage runoff can be discharged to the natural water body and water bloom of the water body is not easily induced, thereby finally reducing non-point source pollution caused by the runoff and protecting the water quality of the natural water body.

Description

technical field [0001] The invention belongs to the technical field of urban rainfall runoff treatment, in particular to a process and system for collecting and purifying rainfall runoff by quality. Background technique [0002] Most of the existing large and medium-sized cities adopt a separate drainage system, which only collects sewage into the sewage treatment plant for treatment, and discharges the runoff that flows into the natural water body through the rainwater pipe network without any treatment. Studies have shown that rainwater runoff carries a large amount of pollutants, and the non-point source pollution formed by it promotes the deterioration of water quality, especially the input of phosphorus element accelerates the process of water eutrophication. The practice of direct discharge of runoff without treatment can no longer meet the increasingly stringent water pollution control requirements. However, if all the runoff is collected into the sewage plant, the u...

AI Technical Summary

Problems solved by technology

The practice of directly discharging runoff without treatment can no longer meet the increasingly stringent water pollution control requirements

However, if all the runoff is collected into the sewage plant, the unstable water input will have a huge impact on the sewage plant and affect the operation of the sewage plant. At the same time, it will also require a huge increase in the construction period to expand the water delivery capacity of the rainwater pipe network.

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