下凹式绿地对雨水径流的控制效果研究

研究了10 cm、15 cm、20 cm三种下凹深度以及添加火山岩、煤渣、沸石三种填料基质情况下下凹式绿地的蓄滞效果;考察了添加火山岩、煤渣、沸石三种填料对下凹式绿地去污效果的影响.结果表明:下凹深度越大,绿地对雨水的削减效果较好,但出于安全考虑,下凹深度应该控制在一定的安全范围内;不同的填料也会对蓄滞和去污效果产生影响,添加火山岩的装置蓄滞效果相对较好,对总磷的去除效果也较好,去除率为82.7％;添加煤渣对总氮的去除率最高,为48％,添加沸石对COD的去除率最好,为34.9％,添加三种材料对SS的去除率都较高,达到95％左右.

Study on Control Effect of Concave Green Space on Rainwater Runoff

The retention effects of three depths 10 cm, 15 cm and 20 cm of concave green spaces under the conditions of adding three padding matrixes of volcanic, coal cinder and zeolite are studied. The influences of adding three paddings of volcanic, coal cinder and zeolite on the decontamination effects of concave green space are inspected. The results show that the greater the concaving depth, the better the reduction effect of green space on rainwater. But for safety reasons, the concaving depth should be controlled within a certain safe range. The different paddings will also affect the retention and decontamination effects. The retention effect of the device with the added volcanic is relatively good. The removal efficiency of total phosphorus is also good, and its removal rate is 82.7%. The removal rate of total nitrogen with the added coal cinder is the highest, and is 48%. The removal rate of COD with the added zeolite is the best, and is 34.9%. The removal rates of SS are all higher by adding three materials, and are about 95%.