Ecological drainage system (EDS) including ditches, ponds and wetland was constructed at the Paifangchen village on the north of Chaohu Lake, Anhui, and its retention effect on pollution was investigated. With the comprehensive function of sewage discharge, collecting and process, the system could intercept runoff pollutants effectively. The results acquired from 3 rainfall events showed that the retention rates of EDS to TSS, COD, TP and TN were 78.2%, 57.8%, 55.5% and 64.2% respectively, and the concentrations at outflow of the system to TSS, COD, TP and NH4(+) -N were 23.5, 66.3, 0.49 and 3.03 mg x L(-1) separately, met the first standard of "Integrated Wastewater Discharge Standards". Ponds were the important unit of EDS and the daily water quality concentrations of TSS, COD, TP and TN were 28.0, 31.2, 0.47 and 4.65 mg x L(-1) respectively, met the V standard of "Environment Quality Standards for Surface Water" basically.
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