某焦化场地重金属与多环芳烃复合污染特征与评价  

Co-contaminated characteristics and assessment of heavy metal and polycyclic aromatic hydrocarbons in a coking site

作　　者：桑康云 张可能[1,2] 吴霞[1,2,3] 朱考飞 张云毅 张强 李斌田[1,2] 胡丰云[1,2] SANG Kangyun;ZHANG Keneng;WU Xia;ZHU Kaofei;ZHANG Yunyi;ZHANG Qiang;LI Bintian;HU Fengyun(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education,Changsha,410083,China;School of Geosciences and Info-Physics,Central South University,Changsha,410083,China;Power China Zhongnan Engineering Corporation Limited,Changsha,410014,China;Hunan City University,Yiyang,413000,China)

机构地区：[1]有色金属成矿预测与地质环境监测教育部重点实验室,长沙410083 [2]中南大学地球科学与信息物理学院,长沙410083 [3]中国电建集团中南勘测设计研究院有限公司,长沙410014 [4]湖南城市学院,益阳413000

出　　处：《环境化学》2023年第5期1651-1662,共12页Environmental Chemistry

基　　金：国家自然科学基金(41972282)资助.

摘　　要：调查与分析焦化遗留场地的土壤复合污染特征是土地安全再利用的基础.以某焦化场地为例,采集0—5 m深度范围内的土壤样品,测定其中的重金属与PAHs含量,并运用反距离插值法分析场地重金属与PAHs的污染特征,采用内梅罗综合污染指数法评估焦化场地重金属的污染程度,质量基准法评价PAHs的生态风险.结果表明:污染物分布的空间差异性明显,重金属与高环PAHs集中分布在0—1 m表层土壤,低环PAHs在杂填土与粉质粘土交界处呈现富集状态;重金属与PAHs的来源不同,但经迁移后在场地煤库、鼓冷车间及制冷站等区域共存形成复合污染;内梅罗综合污染指数评价表明,场地内气柜、煤库/煤棚、制冷站区域为中度—重度污染,质量基准法表明气柜、鼓冷车间、洗苯脱苯车间及煤库/煤棚处于中—高生态风险.本研究结果能够为焦化场地的后续土壤修复工程及生产工艺优化提供参考.Investigating and analyzing the compound pollution characteristics of coking site is the basis of land safe reuse.Taking a coking site as an example,soil samples at 0—5 m depth were collected to measure the content of the heavy metals and PAHs,The pollution characteristics of heavy metals and PAHs in the site are analyzed by using the inverse distance interpolation method,and the pollution degree of heavy metals in the coking site is evaluated by using the Nemero comprehensive pollution index method,the ecological risk of PAHs is evaluated by using the quality benchmark method.The results show that the distribution of pollutants has obvious spatial differences.Heavy metals and high molecular weight PAHs are concentrated in the 0—1 m surface soil,then the concentration of low molecular weight PAHs presents an enrichment state at the junction of miscellaneous fill and silty clay;The sources of heavy metals and PAHs are different,but they coexist and form compound pollution in coal bunker,blast cooling workshop and refrigeration station of the coking site after migration.The evaluation results of the Nemero comprehensive index show that they are moderately—severely polluted in gasholder,coal depot/coal shed,refrigeration station.The quality benchmark method shows that the gasholder,refrigeration station,coal depot/coal shed,drum cooling workshop,and benzene washing and debenzylation workshop are in medium—high ecological risk.The results of this research can provide guidance for the subsequent soil remediation project and production process optimization of coking site.

关 键 词：复合污染 多环芳烃 重金属 分布特征 污染评价 

分 类 号：X53[环境科学与工程—环境工程] X825