A method and system for recycling rainwater from urban roads

Abstract

The invention provides an urban road rainwater recycling method and system. In consideration of the extent of pollution to rainwater of the road surface of roadways and sidewalk roads, rainwater collection is divided into two steps, the rainwater on the sidewalk roads is collected by the aid of a semi-closed storage area, a controller is used for controlling supplementing of groundwater when the groundwater level is low, and the clean rainwater is directly collected in a cleaned-water storage tank when the groundwater level is high; for the rainwater on the roadways and in consideration of the extent of pollution to the rainwater divided, the rainwater is divided into first rainwater and subsequent rainwater by the aid of rainwater diversion areas, the first rainwater is collected to a sewage treatment area for treatment prior to being collected to a cleaned-water storage area, the subsequent rainwater is directed used for irrigating greenbelts prior to being filtered and purified via shallow trenches and seepage channels under the greenbelts to be collected to the cleaned-water storage area. The extent of pollution of the rainwater in different areas and periods is fully considered, different treatments are performed, use of detergents can be greatly reduced, energy conservation and environment friendliness are achieved, and the rainwater is recycled maximumly.

Description

technical field [0001] The invention relates to a method and system for recovering and reusing rainwater on urban roads, and belongs to the technical field of rainwater collection. Background technique [0002] With the increase of urban air pollution and ground pollution, the pollution of rainwater runoff is becoming more and more serious, especially the more polluted initial rainwater (referred to as initial rain). Numerous studies at home and abroad have shown that the initial rainwater quality of runoff is very poor, and the highest pollutant index value of initial rainwater in some areas is much higher than that of typical urban domestic sewage. Therefore, the treatment and disposal of initial rainwater is the key to rainwater recycling and utilization. At present, the treatment method of discarding the primary rain runoff is mostly used, and some interception pipe network systems are used to intercept the initial rainwater, which uses the interception pipe network syst...

AI Technical Summary

Problems solved by technology

Numerous studies at home and abroad have shown that the initial rainwater quality of runoff is very poor, and the highest pollutant index value of initial rainwater in some areas is much higher than that of typical urban domestic sewage. Therefore, the treatment and disposal of initial rainwater is the key to rainwater recycling and utilization. At present, the treatment method of discarding the primary rain runoff is mostly used, and some interception pipe network systems are used to intercept the initial rainwater, which uses the interception pipe network system to intercept the initial rainwater to the sewage pipeline and send it to the sewage treatment plant for purification treatment. The pollution degree of rainwater in the later period of rainfall is relatively light. After pretreatment, it is directly discharged into natural water bodies. However, the current initial rainwater interception facilities have the following disadvantages: the structure of the interception pipe network system is complex, and operation and maintenance are difficult; The equipment is easy to block during the previous pretreatment

[0003] On the other hand, for more developed cities, roads are usually divided into vehicle roads and pedestrian roads by green belts. Due to the great difference in the pollution of vehicle roads and pedestrian roads, if a general recycling method is adopted, it will also affect pedestrian roads. Use of extensive decontamination treatment followed by collection, resulting in reduced rainwater treatment efficiency, waste of decontamination agents and energy

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