沥青楼顶面微集雨水中浊度及COD浓度随储存时间的变化规律

Change Rules of Micro Rainwater Turbidity in Asphalt Roof Surface and COD Concentration Variation with Storage Time

为充分利用城市地区次降雨资源,以西安理工大学办公楼沥青楼顶面(单一下垫面)采集到的8个微集雨桶水为例,发现微集雨桶水中浊度随时间呈下降趋势且基本上符合幂函数关系,前60d内化学需氧量(COD)浓度与时间的关系为一元二次函数关系;构建了微集雨桶水中浊度与次降雨量、初始浊度及储存时间的关系式及微集雨桶水中COD浓度与次降雨量、初始COD含量及储存时间的关系式,根据次降雨量、浊度或COD初始值就可得到不同储存时间段内微集雨桶水中的浊度或COD浓度。

In order to make full use of the second rainfall resources in urban areas, taking the eight micro harvesting buckets of water which were collected from the asphalt roof surfaces （single underlying surface） in Xi~ an University of Technology^s official building for an example, it finds out that micro harvesting buckets of water turbidity decreased with the tendency of time and basically fit the power function relationship; within the preceding 60 d, the relationship between the concentration of COD and time is a quadratic function. It builds a micro catchment bucket of water turbidity and sub rainfall, the relationship between initial turbidity and storage time as well as the COD concentration in the micro catch- ment and subbucket rainfall, and the relationship between initial COD content and storage time. According to the second rainfall, turbidity or initial value of COD, it can obtain the micro harvesting buckets of water turbidity or COD concentra- tion in different periods of storage time.