倒置生物滞留技术水量水质控制效果研究

生物滞留技术是目前应用较为广泛的雨洪控制利用措施,生物滞留技术在应用过程中也出现一些问题。针对传统生物滞留设施存在的水土流失、污染物表层累积、填料层更换困难等问题,提出了一种新型倒置生物滞留技术。通过实验室模拟试验,研究了不同重现期条件下,倒置生物滞留技术的水量、水质控制效果,并与传统生物滞留技术进行了比较。结果表明:倒置生物滞留技术在径流总量控制率、峰值削减率方面比传统生物滞留分别提高了9%～21%和1%～32%;在峰值延迟时间方面最大延长了8 min;倒置生物滞留对TP、TN、COD、NH_4~+-N等污染物的平均去除率比传统生物滞留分别提高了约6%、4%、3%、6%。研究成果可为倒置生物滞留技术在海绵城市建设中广泛应用提供技术支撑,为生物滞留技术的完善与发展提供借鉴和参考。

Study on water quantity and water quality control effect of inverted bioretention technology

Bioretention technology is currently widely used in stormwater control and utilization,and bioretention technology also reveals some problems in the application process.Aiming at the problems of soil erosion,accumulation of pollutant on surface layer and difficulty in replacement of filler layer in traditional bioretention technology,a novel inverted bioretention technology was proposed.The artificially rainwater runoff was adopt in a series of laboratory experiments,to analyze the runoff volume and quality control effects of the novel bioretention technology under different return period,and compared with traditional bioretention technology.The results show that the novel bioretention technology improves the total runoff volume control rate and peak reduction rate by 9%~21%and 1%~32%,respectively,and the maximum delay of peak flow appear time is 8 min;the average removal rate of TP,TN,COD,NH+4-N by novel bioretention was increased about 6%,4%,3%,and 6%,respectively,compared with traditional bioretention.The research results can provide technical support for the extensive application of inverted bioretention technology in the construction of sponge city,and provide reference and reference for the improvement and development of bioretention technology.