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北京东南城区雨水化学特征与化学稳定性分析

Keywords: 北京城区,降雨,水质,化学特性与稳定性,雨水利用

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Abstract:

为了给北京市城区雨水利用提供基础数据.基于近几年北京东南城区17场典型的自然降雨和不同下垫面径流雨水水质检测结果,分析了雨水的水质特性及其化学稳定性.研究结果表明,北京东南城区自然降雨和地表径流雨水水质为重碳酸盐钙组Ⅰ型;雨水水质已经受到一定程度的污染,主要污染物为有机物和含氮化合物;雨水的pH值与雨水中碱性粒子浓度呈显著的正相关性;水的稳定性主要受CaCO_3溶解沉淀过程控制,除机动车道径流雨水为沉积性水质外,自然降雨和其他地表径流雨水多呈侵蚀性.因此,在城区雨水利用过程中应注意雨水水质污染和工程设施侵蚀的问题.

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