生态滤池在低污染水体治理中的应用及其季节效应

Application and Seasonal Effect of Ecological Filter in Treatment of Low-polluted Water

在武汉动物园构建了生态滤池,进行了处理低污染水体的现场试验。结果表明,在进水污染物浓度很低的情况下,生态滤池对地表径流中COD和TSS的去除率最高,分别为55.2%和58.2%;对模拟劣Ⅴ类地表水中TN和TP的去除率最高,分别为54.1%和27.9%。在植物快速生长季节,根系的增加使基质孔隙度减小,导致滤池对浊度的去除率有所下降。气温的季节性变化是导致滤池内水温变化的主要因素,但半地埋的修建方式使地面对水温变化也具有一定的影响。

An ecological filter was constructed in Wuhan City Zoo to treat low-polluted water. The field experiment results indicate that despite the low pollutant concentration in the inflow, the maximum removal rates of COD and TSS in surface runoff are 55.2% and 58.2% respectively, and the maximum removal rates of TN and TP in the simulated surface water worse than grade V are 54.1% and 27.9% respectively. In seasons when plants grow rapidly, the removal rate of turbidity is reduced because of the decrease in matrix porosity caused by augmentation of plant roots. The water temperature in the ecological filter is mainly affected by seasonal variation of air temperature. At the same time, the ground temperature has a certain effect on the variation of water temperature due to the semi-buried construction of ecological filter.