农村小型水库流域污染特征分析及治理对策-以庐江县金汤水库为例

Analysis of Pollution Characteristics of Small-scale Rural Reservoirs and Treatment Countermeasures:a Case Study of the Jintang Reservoir in Lujiang County

针对金汤水库水质现状,对流域范围内主要污染来源进行调查分析,计算了污染物入库量以及达到目标水质所需削减的污染负荷量。结果表明,金汤水库的COD、NH_(3)-N、TN和TP的入库总量分别为63.65 t/a、5.47 t/a、14.97 t/a和1.04 t/a;从入库污染负荷的结构组成来看,主要污染源为农业面源污染;基于地表水Ⅲ类水质目标、90%保证率下水库的水环境容量计算结果,需削减的污染负荷量为4.69 t/a和0.53 t/a;根据分析结果,建议利用河道两侧现有水塘、沟渠构建旁路湿地对入库河流进一步处理。

In view of the current water quality of the Jintang Reservoir,the main sources of pollution within the basin were investigated and analyzed,and the amount of pollutants entering the Reservoir and pollution load to be reduced to achieve the target water quality were determined.The results showed that the total amount of COD,NH_(3)-N,TN and TP entering the reservoir were 63.65 t/a,5.47 t/a,14.97 t/a and 1.04 t/a respectively;from the perspective of the structural composition of the pollution load,the main pollution source was agricultural non-point source pollution;based on the calculation results of the surface water quality target of Class III and the water environment capacity of the reservoir under the guarantee rate of 90%,the pollution load to be reduced was 4.69 t/a and 0.53 t/a;according to the results,constructing bypass wetlands for further treatment of the river entering the reservoir was recommended with the existing ponds and ditches.