广州市黑臭河涌底泥污染特征分析与评价

Analysis and Evaluation of Sediment Pollution Characteristics of Black and Odorous River Substrate Sludge in Guangzhou

为研究河网密布区域黑臭河涌底泥污染情况,选取广州市列入省考断面的重要黑臭河涌及其主要一级支流作为研究对象,分析了底泥中总氮(TN)、总磷(TP)、有机质(OM)及重金属污染含量,并分别采用综合污染指数法、潜在生态风险指数法对营养盐、重金属污染进行评价。结果表明底泥中TN、TP、OM含量范围为3020~5240mg kg,属于TN、TP重度污染,有机质污染显著;重金属单项及综合潜在生态风险指数均为低风险等级,黑臭河涌的重金属污染程度较轻。

In order to study the sediment pollution of the black-odorous river in the region with dense river networks,the important black-odorous river and its main primary tributaries,which were listed in the provincial section of Guangzhou City,were selected as the research objects,the contents of total nitrogen,total phosphorus,organic matter and heavy metals in sediment were analyzed,and the comprehensive pollution index and potential ecological risk index were used to evaluate the pollution of nutrients and heavy metals.The results show that the contents of TN,TP and OM in the sediment ranged from 3020 to 5240 mg/kg,from 810 to 2660 mg/kg and from 5.46 to 163 g/kg,which belonged to the heavy pollution of TN and TP,and the organic pollution was significant,the pollution level of heavy metals in the black and odorous river was relatively light.