黄土塬地区村镇集蓄雨水的水质特性分析

Analysis on Quality of Rainwater Harvested in Rural Area in Loess Tableland

分析了黄土塬地区不同集雨水源地——庭院土地面、砖地面、瓦屋面、水泥地面的降雨径流水质及主要水质指标之间的相关性,研究了适合雨水收集利用的集雨水源地类型。结果表明:在径流初期,集雨水源地的降雨径流污染均较严重,污染物浓度较高;随降雨历时的延长,各污染物浓度呈下降趋势,降雨径流的主要水质指标具有相关性;瓦屋面、砖地面、水泥地面的降雨径流水质较土地面的好,可作为集雨水源地;弃去前期径流雨水,集蓄雨水可满足雨水饮用处理的要求。

The quality of rainwater harvested from courtyard soil ground, brick ground, tiled roof and cement ground in loess tableland and the correlation among main quality indexes are analyzed, and the types of rainwater harvesting sources used for rainwater harvesting were studied. The results show that the rainwater runoff in rainwater harvesting sources is polluted seriously at the early stage, with high pollutants concentration. The concentrations of pollutants are decreased with increasing rainfall duration, and there is a correlation among main quality indexes of rainwater runoff. The quality of rainwater harvested from brick ground, cement ground and tiled roof is better than that of soil ground, so the three kinds of grounds can be used to harvest rainwater. The harvested rainwater can meet the requirements of drinking water treatment when discarding the early stage flush rainwater.