滇池流域典型城郊降雨径流COD_(cr)及TSS污染负荷及贡献

Pollution Load and Contribution of Rainfall Runoff from a Typical Suburb Region in Dianchi Lake Catchment

通过野外实地监测和室内分析,系统监测了滇池流域典型城郊排放污水CODcr和TSS通量,采用城市降雨径流污染负荷的计算方法估算了城郊降雨径流CODcr和TSS污染负荷,并分析了由降雨径流引起的CODcr和TSS污染负荷占总负荷中的比例。结果表明,滇池流域城郊人均排放CODcr和TSS污染负荷分别为9.58～10.57kg/a和2.88～3.14kg/a;滇池流域城郊由降雨径流引起的CODcr和TSS污染负荷分别为1.166～1.458t/(hm2.a)和0.729～1.808t/(hm2.a)。全年由降雨径流引起的CODcr和TSS污染负荷分别占总污染负荷的10.96%～15.35%和25.73%～35.89%。控制降雨径流污染是缓解滇池流域城郊面源污染的途径之一。

Combining field monitoring and laboratory analysis,this paper analyzes CODcr and TSS fluxes of a typical suburb discharge sewage in Dianchi Lake catchments.We use the pollution load of urban rainfall runoff to estimate the pollution load of suburb rainfall runoff and analyze the ratios of CODcr and TSS caused by rainfall runoff to the total load.Results show that by suburb discharge sewage per capita load,CODcr is 9.58～10.57 kg/a and TSS is 2.88～3.14 kg/a and by the suburb pollution load of rainfall runoff,CODcr is 1.166～1.458 t/（hm2·a） and TSS is 0.729～1.808 t/（hm2·a） in the Dianchi Lake catchments.Throughout the year,CODcr and TSS caused by rainfall runoff account for 10.96%～15.35% and 25.73%～35.89% of the total catchment area of emission pollution load,respectively.Control of rainfall runoff pollution is one of the ways to mitigate non-point source pollution of suburb in the Dianchi Lake catchments.