引江济淮工程疏浚抛泥区淤泥污染特征与评价

Pollution Characteristics and Evaluation of Dredged Sludge in Dumping Area of Water Diversion Project from Yangtze River to Huaihe River

以引江济淮工程巢湖疏浚抛泥区淤泥为研究对象,开展了淤泥中重金属和氮磷等营养物质的污染特征分析,并进行了重金属污染生态风险评价和氮磷污染评价。结果表明,重金属汞的污染程度和潜在风险较高,重金属潜在生态风险以中风险和高风险为主。淤泥中总氮、总磷浓度最大值超出背景值达1.95倍和0.73倍。总氮标准指数、总磷标准指数、综合污染指数、有机氮、有机指数评价结果表明,淤泥中氮磷以轻度污染和中度污染为主。

Taking the dredged sludge of Chaohu Lake in dumping area of the water diversion project from Yangtze river to Huaihe river as the research object,an analysis of the pollution characteristics of heavy metals and nitrogen and phosphorus in the sludge was conducted,the ecological risk of heavy metal pollution and nitrogen and phosphorus pollution was also evaluated.The results indicated that the pollution level and potential risk of heavy metal mercury were relatively high,the potential ecological risks of heavy metals were mainly medium and high risks.The maximum concentrations of total nitrogen and total phosphorus in the sludge exceeded the background values by 1.95 and 0.73 times,respectively.The evaluation results of total nitrogen standard index,total phosphorus standard index,comprehensive pollution index,organic nitrogen and organic index indicated that the nitrogen and phosphorus in the sludge were mainly mildly and moderately polluted.