屋面集雨径流水质及初期弃流雨量研究

Research on Water Quality and Initial Discarded Amount of Roof Rain-off

对屋面初期雨水径流水质进行了现场试验,对雨水径流的悬浮物和COD污染物指标进行了取样分析。结果表明,屋面雨水径流的初期冲刷效果明显,且雨水径流中的污染物浓度的变化符合指数形式的变化规律。在此基础上,提出屋面雨水利用的初期雨水弃流量,为雨水集蓄的实际应用提供参考依据。

This paper presents the results of variations in SS and COD in roof rainfall rain-off with rainfall amount based on the field experiments.The results indicate that the initial wash effects of rainfall rain-off on roof pollutions are significant and that changes of the SS and COD concentrations during the initial period of a rainfall event are well fitted with exponential equations.From these,initial discarded rainfall amount for roof wash effect is proposed.It can be adopted in the practice of rainwater harvesting for rural water supply.