摘要
河湖生态修复是当前流域水环境治理的重点。文中针对镇江市域内22个具有代表性的河湖断面,分析河湖底泥中的6种重金属(Zn、Cu、Pb、Ni、Cr、As)含量,分别用地积累指数和内梅罗指数评价重金属的污染程度,揭示镇江市河湖底泥重金属的污染分布特征。结果表明,河湖底泥中Zn、Cu、Cr、Pb、Ni、As元素平均质量分数分别为361.95、64.49、111.16、63.31、45.21、11.97 mg/kg,单元素分别有95.45%、95.45%、63.64%、77.27%、77.27%、9.09%的点位超过江苏省土壤背景值。通过地积累指数和内梅罗指数评价发现,镇江市城区河道重金属污染程度比城区外围河湖严重,其中古运河和江南运河是镇江市重金属污染相对严重的河道,其主要原因与河道周边的生活区、商业区、交通排放尾气和工业排放废水等人类活动相关。对于污染较轻的城市外围河道底泥,可利用生物原位修复技术吸附重金属;对于污染较严重的中心城区河道底泥,可采用异位修复技术固化重金属,处理后的渣土用于可工程回填等。
Ecological restoration of rivers and lakes is the focus of current watershed environmental management.22 representative river and lake sections in Zhenjiang city were investigated in this paper.The distribution characteristics of six heavy metals(Zn,Cu,Pb,Ni,Cr,As)were analyzed and pollution levels were evaluated based on the geoaccumulation index and Nemerow index.The results showed that the average contents of Zn,Cu,Cr,Pb,Ni and As in the sediments of rivers and lakes were 361.95,64.49,111.16,63.31,45.21,11.97 mg/kg,respectively.The percentages of points exceeded the soil background value of Jiangsu Province were 95.45%,95.45%,63.64%,77.27%,77.27%,9.09%,respectively.By the analysis of geoaccumulation index and Nemerow index,it was found that the heavy metal pollution in urban areas was more serious than that in the suburbs.Among them,the Guyun Canal and the Jiangnan Canal in the urban areas were the most polluted river in Zhenjiang City, which was due to human activities such as household discharge, industrial discharge and traffic emissions. Bioremediation techniques were suggested to restore the less polluted rivers in the suburbs, while solidification techniques for the immobilization of heavy metals were recommended to restore the more polluted rivers in the urban areas. The treated sediments can be used for building materials.
作者
黄嘉良
梅晓洁
方宁
郭亚丽
周维奇
HUANG Jialiang;MEI Xiaojie;FANG Ning;GUO Yali;ZHOU Weiqi(YANGTZE Eco-Environment Engineering Research Center<Shanghai>,China Three Gorges Corporation,Shanghai200335,China;Shanghai Investigation,Design&Research Institute Co.,Ltd.,Shanghai200335,China)
出处
《净水技术》
CAS
2022年第7期119-125,共7页
Water Purification Technology
基金
中国长江三峡集团有限公司项目资助(合同编号:202003081)。
关键词
河湖底泥
重金属
地积累指数
内梅罗指数
污染分布
来源解析
river and lake sediment
heavy metal
geoaccumulation index
Nemerow index
pollution distribution
source analysis
作者简介
黄嘉良(1994-),男,助理工程师,主要从事污泥处理处置与资源化方向的研究工作,E-mail:573601370@qq.com。;通信作者:郭亚丽,E-mail:gyl@sidri.com。
