改良填料生物滞留柱去除雨水径流中污染物试验研究

An Experimental Research on the Removal of Pollutants in Rainwater Runoff by Improved Filler Biological Retention Tanks

针对传统类型生物滞留设施氮、磷去除效果不佳且不稳定的问题,对装填改良材料的传统生物滞留柱性能展开了研究。构建了4个生物滞留柱(Z1、Z2、Z3、Z4),Z1为对照生物滞留柱,其余3个柱子分别装有麦饭石、沸石、蛭石填料层,柱内均设置了35 cm的淹没区,对滞留柱出水进行取样分析。结果表明:4个生物滞留柱对TP、COD、氨氮、硝态氮的去除率分别为76.7%~85.6%、87.78%~94.19%、76.7%~87.67%和78%~88%。与Z1相比,Z2、Z3和Z4对不同污染物的去除效果都有提升,其中Z4(蛭石填料)去除效果最优。

In view of the poor and unstable removal effects of nitrogen and phosphorus by traditional biological retention facilities,a research has thus been carried out on the performance of biological retention columns packed with improved fillers.Four biological retention columns have been constructed,one being a control biological retention column(Z1),and three equipped with different modified packing layers(maifanite,zeolite,vermiculite)biological retention columns,with a 35 cm submerged area set up in the column,followed by a sampling and analysis of the effluent of the retention columns.The results show that the removal rates of TP,COD,NH_(4)^(+)-N,and NO_(3)^(-)-N by the four biological retention columns are 76.7%~85.6%、87.78%~94.19%、76.7%~87.67%and 78%~88%,respectively.Compared with Z1,it is obvious that Z2,Z3 and Z4 are characterized with improved removal effects of different pollutants,among which Z4(vermiculite filler)has the best performance.