重庆长生河河道底泥污染特征分析及生态风险评价  

Analysis on pollution characteristics and ecological risk assessment of sediment from Changsheng River in Chongqing

作　　者：赖生平 张涵博 石德智[2] 童海航 罗丹[2] 杨洪伟 聂明建 Lai Shengping;Zhang Hanbo;Shi Dezhi;Tong Haihang;Luo Dan;Yang Hongwei;Nie Mingjian(Chongqing Derun Environment Co.,Ltd.,Chongqing 400042,China;College of Environment and Ecology,Key Laboratory of the Three Gorges Reservior Region′s Eco-Environment,Ministry of Education,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆德润环境有限公司,重庆400042 [2]重庆大学环境与生态学院三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《能源与环保》2022年第4期39-44,共6页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：重庆市水务资产经营有限公司科技创新课题(G202014)。

摘　　要：以重庆市长生河流域待清淤治理的3条干支流为研究对象,针对河道底泥中的含水率、营养盐、有机物、重金属和多环芳烃污染物含量进行监测和分析,采用单项指数法、有机指数法、潜在生态危害指数法等方法进行生态风险评价,为河道疏浚工作以及疏浚底泥的处置与资源化利用提供科学的参考依据。分析表明,底泥中全氮(TN)、有机质(OM)污染均为轻微程度,有一半采样点的TP污染为中度和重度污染;7种重金属中,Zn含量最大,而Cd的单重金属生态潜在危害程度最大,其各样点的Cd均高于中度危害;16种多环芳烃含量低,均为低污染程度。Three rivers including mainstream and tributaries of Changsheng River urban of Chongqing,which calls for sediment dredging,were selected as object of this study.Nutrients,organic matter,heavy metals and polycyclic aromatic hydrocarbons pollutants in the river sediments were monitored and analyzed.Then risk assessment of sediment was evaluated by single index,organic index and potential ecological risk index.The analysis on pollution characteristics and ecological risk assessment of sediment would provide a scientific basis for the sediment dredging as well as the disposal and reuse of the polluted sediment.The contamination level of TN(Total Nitrogen)and OM(Organic Matter)in sediment is low,while TP is in middle or high level within half sampling points.The contents of Zn are in the highest levels among the 7 kinds of heavy metals mentioned in the text.However,the single potential ecological risk index of Cd is the biggest,and all of the sampling points have an at least moderate extent of ecological risk.The contents of 16 kinds of PAHs are in low extent and the degree of PAHs for all samples is low.

关 键 词：河道 底泥 污染特征 风险评价 

分 类 号：X52[环境科学与工程—环境工程] TV851[水利工程—水利水电工程]