下凹式绿地对模拟道路径流中磷削减效果研究

The Cutting Effect of Phosphorus in Simulated Road Runoff by Concave Herbaceous Field

该文根据下凹式绿地的原理设计构建了实验室小试装置,以人工配水模拟道路径流,研究下凹式绿地对径流雨水中总磷(TP)、溶解性磷(DP)和溶解性无机磷(DIP)的削减效果,探讨了设计暴雨重现期、雨水管超高、进水污染物负荷对下凹式绿地削减道路径流中各形态磷的影响规律。研究结果表明,下凹式绿地对磷具有明显的削减效果,总磷(TP)、溶解态磷(DP)、溶解态无机磷(DIP)的总量削减率平均为86.28%、77.02%、78.17%。设计暴雨重现期和雨水管超高对下凹式绿地削减磷的效果有一定影响,重现期越小,雨水管超高越大,磷的削减效果越好。经下凹式绿地处理后的径流中TP的去除率在两种进水污染物负荷条件下基本相等,DP、DIP的去除率受进水污染物负荷的影响,高负荷进水的去除率大于低负荷进水。

A device was made in laboratory based on the principle of concave herbaceous field. R was used to study the reduction effect of total phosphorus（TP）, dissolved phosphorus （DP） and dissolved inorganic phosphorus （DIP） in simulated road runoff, which was also made up in laboratory. Different design return period of storm, the rain well ultra-high and influent pollutant load were discussed and the impact of concave herbaceous field on the reduction effect of forms of phosphorus was analyzed. Results showed that concave herbaceous field has significant reduction to phosphate, with average reduction rates of TP, DP and DIP as 86.28%, 77.02% and 78.17% respectively. The reduction effect was ＇influenced by design return period of storm and rain well ultra-high. With the decrease of design return period and growth of rain well ultra-high, the reduction rate of phosphorus was better. After treatment under concave herbaceous field, the removal rates of TP were basic equal in two conditions of influent pollutant load. The removal rate of DP and DIP was influenced by influent pollutant load, with the removal rate of high load influent bigger than the low load.