生物滞留槽的径流污染削减特性试验研究

Experimental study on the characteristics of runoff pollution reduction in bioretention

生物滞留槽作为一项能有效改善水质的低影响开发设施LID,在我国海绵城市建设中得到了广泛的应用。通过对生物滞留槽进行模拟试验,监测了排水管出水污染物浓度变化,研究了生物滞留槽的污染物浓度和总量削减效果。结果显示,生物滞留槽对总磷TP、氨氮NH3-N、总氮TN、生化需氧量BOD、化学需氧量COD的平均浓度削减率为66.55%、22.57%、-118.55%、51.64%、29.29%,总量削减率为81.90%、58.23%、-15.67%、73.89%、60.80%;生物滞留槽对污染物总量的去除效果要好于对浓度的去除效果。试验结果表明,生物滞留槽能有效去除雨水中的污染物,达到净化水质的目的。

As a low impact development facility, bioretention can effectively improve water quality, and has been widely used in China＇s sponge city construction. Through a simulation test of bioretention, the concentration of pollutant effluents in the drain pipe was monitored, the reduction efficiency of pollutant concentration and pollutant amount were studied. The results showed that the average concentration reduction rate of total phosphorus （TP）, ammonia nitrogen, total nitrogen （TN）, biochemical oxygen demand （BOD） and chemical oxygen demand （COD） was 66.55%, 22.57%, -118.55%, 51.64%, 29.29%; and the reduction rate of pollutant amount was 81.90%, 58.23%, -15.67%, 73.89%, 60.80% . The reduction efficiency of the bioretention on the pollutant amount was better than that of the pollutant concentration. The results showed that the bioretention could effectively remove the pollutants in rainwater and achieve the aim of water purification.