赣江南昌段污染负荷及水环境容量分析

通过调查和分析赣江南昌段各污染源,以化学需氧量和氨氮为污染负荷指标,分析了赣江流域南昌段污染负荷现状,确定了主要污染源。在此基础上,选择氨氮和化学需氧量作为计算因子,利用二维水质模型测算赣江南昌段水环境容量。根据水环境容量计算结果和现状污染物排放量,得到赣江南昌段各江段剩余水环境容量。结果表明:2008年南昌市排入赣江南昌段的污染负荷量为94255.47t,以化学需氧量为主。污染源中以城镇生活污染源、农田地表径流污染源和工业污染源为主。赣江南昌段除赣江南支外其余部分水质良好,有较富足的水环境容量。

Analysis of Pollution Loading and Water Environmental Capacity of Gan River in Nanchang

Based on the investigation and analysis of various pollution sources,status quo in Nanchang section of Gan River was analyzed with COD and NH3-N as index of pollution load,and main pollution source was found. Choosing NH3-N and COD as two indicators,water environmental capacity was computed using two dimensional water quality model as well. According to the water environment capacity and recent amount of pollution discharged into the river,remaining environment capacity was obtained. Results indicated that the pollution load discharged into Nanchang section of Gan River was 94,255.47t in 2008,most of which was COD,with major pollution source being from municipal domestic sewage,agricultural runoff and industrial wastewater. The River has good water quality and amply water environmental capacity except southern branch,which doesn’t have residual water environmental capacity.