生态学杂志2024，Vol.43Issue(4)：1209-1216,8.DOI:10.13292/j.1000-4890.202404.028
污染场地风险管控措施的效果及其环境启示:以西南某铬污染场地为例
The performance of risk management in contaminated sites and its environmental implications:A case study of a chrome-contaminated site in SW China
摘要
Abstract
To understand the performance of long-term risk management in contaminated site,we developed a con-ceptual model of site risk control according to a study in a chemical plant in southwest China with the risk manage-ment from 2004 to 2020.In 2012 and 2020,soil samples,groundwater and water samples were collected to analyze the concentrations of total chromium(Cr)and Cr(Ⅵ).Combined with the monitoring data from 2004 to 2020 in wastewater treatment station,we calculated the reduced load of Cr(Ⅵ).The Cr concentration in wastewater was 1200 mg·L-1 in 2004,which decreased significantly and tended to be stable at 400 mg·L-1 after 2020.Such changes were correlated with implementation of risk control measures since 2004,including the pollution source control transmission process and terminal disposal projects.The groundwater volume in the contaminated site tended to increase to a peak in 2007 and decrease to a stable level after 2010,which varied from 36800 to 256300 m3.From 2004 to 2020,the cumulative volume of the treated wastewater by the groundwater extraction and treatment project was 2160000 m3,with the total reduction of Cr(Ⅵ)discharge load was 1376 t.The Cr(Ⅵ)concentrations in effluent water have reached the Cr(Ⅵ)criteria in the Comprehensive Sewage Discharge Standard(GB 8978-1996)after 2010.Moreover,the Cr(Ⅵ)contents in soil samples in 2020 were lower than those in 2012 under the long-term risk management measure.Meanwhile,the Cr(Ⅵ)concentrations in sensitive water bodies reached the Cr(Ⅵ)criteria in Surface Water Environmental Quality Standard(GB 3838-2002).It can be concluded that long-term implementation of risk control measures on the contaminated site has obtained favorable effect to keep the Cr(Ⅵ)in the environment under control.Our results provide a scientific basis for the implementation of long-term risk control measures in Cr(Ⅵ)in contaminated sites,and a reference for the risk control of other heavy metals contaminated sites.关键词
污染场地/铬(六价)/风险管控/长期管控/工程措施Key words
contaminated site/Cr(Ⅵ)/risk control/long-term implementation/engineering measure引用本文复制引用
郑佳,刘嘉烈,李广辉,刘元元,王东,彭政,樊艳玲..污染场地风险管控措施的效果及其环境启示:以西南某铬污染场地为例[J].生态学杂志,2024,43(4):1209-1216,8.基金项目
国家重点研发计划项目(2018YFC1801405)资助. （2018YFC1801405）
