科研之友
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摘要
In this study, we investigated the characteristics of the rainwater runoff from cement roof and pavement in Wenchang city, Hainan Province to establish the strategies for diverting first-flush and collecting rainwater from different impervious catchment. It was found that first flush effect occurred in most rainfall events. The pollutant concentrations of rainwater runoff from cement pavement were much higher than those on cement roof, while the concentrations of pollutant in the initial 30% rainwater from different impervious catchments were higher than those in the latter 70%. By comparing with relevant water quality indexes, the rainwater runoff from cement roof could be used as drinking water, and rainwater from cement pavement could be harvested for urban miscellaneous water after treatment. According to the development of stormwater runoff pollutant build-up and wash-off model, volumes of diverted water on different impervious catchment could be calculated and the diversion strategy was then established. Correspondingly, the household and eco-friendly rainwater harvesting strategies were developed with respect to two impervious catchments based on the transport characteristics and quality of runoff pollutants, first-flush diversion and maximum amount of water that can be availably harvested. Hereby, it provides a valid reference basis for rainwater harvesting in island.
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