Mountainous city heavy-gradient road runoff pollution control step permeation system

Abstract

The invention relates to a mountainous city heavy-gradient road runoff pollution control step permeation system. The cascade permeation system mainly comprises road shoulder girdle laminar flow feedwater, a vegetation filtering area, a retention permeation area, a step weir and an overflow discharge facility, wherein the retention permeation area comprises a retention water space, a plant layer, a planting substrate layer, a filtration layer and a water storage layer. Overload runoffs generated from a city road are distributed and discharged into the vegetation filtering area through a road shoulder girdle; the overload runoffs are precipitated and filtered in the vegetation filtering area and then converged to the retention permeation area; in the process that the overload runoffs permeate downwards, pollutants are removed through precipitation, substrate filtration and adsorption; a broken stone water storage and discharge layer at the bottom of the retention permeation area temporarily contains the overload runoff so as to provide time for overload runoff to further permeate into deep soil, and excess overload runoff is discharged through arrangement of a tapping water collection and discharge pipe in the broken stone layer. The step permeation system has retention and permeation effect on road overload runoff and bears overload runoff discharge function; due to arrangement of the step wire, the system can be applied to an area having gradient of 10% and is suitable for treatment of mountainous city heavy-gradient road runoffs.

Description

Technical field: [0001] The invention relates to a pollution control technology of urban surface runoff, mainly through the transformation of the green belt on the shoulder belt side of the urban road, using soil improvement to enhance permeability, filling infiltration matrix, and planting specific plants to retain urban surface runoff The effect of infiltration, so as to achieve the effect of improving the water quality of urban surface runoff, can be used for the control of surface runoff water volume and water quality of large-slope roads in mountainous cities. Background technique: [0002] Urban surface runoff pollution, as the main pollution problem in the world today, has caused serious water environment deterioration and water ecological crisis in many parts of the world. With the acceleration of urbanization in my country, the expansion of urban scale, changes in land use / cover, and the emergence of a large number of impervious surfaces have significantly changed r...

AI Technical Summary

Problems solved by technology

However, the grass-planting ditch has a limited effect on the retention of surface runoff water and the improvement of water quality.

In addition, when the road slope is relatively large in mountainous cities, the grass-planting ditch is not suitable for application due to the strong scouring effect of surface runoff.

Images