环境工程学报2023，Vol.17Issue(12)：3960-3968,9.DOI:10.12030/j.cjee.202307097
岩溶断层区含油废水溢流地下水污染风险评价
Assessing the risk of petroleum polluted groundwater from oily wastewater overflow in karst fault area
摘要
Abstract
Karst groundwater is an important source of water for living and production in karst areas of southwest China.Karst area has complex geological structure,so that once the groundwater in karst area is polluted,it will bring great challenges to the treatment work.Taking an oil-bearing wastewater overflow area as the research object,this study investigated the geological structure,cave channels and faults of the polluted area,analyzed the source,distribution range and main migration channels of pollutants,and assessed the self-purification capacity(SPC)of groundwater and its pollution risk.The results show that petroleum hydrocarbon(C10-C40),cyanide and toluene are seriously polluted in this area,and the detection rates of the three pollutants are as high as 98.7％,75.3％and 59.7％,respectively.There are still a lot of petroleum pollutants in the vadose zone,and the content is as high as 14.07 tons.There are two karst channels in the groundwater system in the karst fault area,and the oil pollutants mainly migrate through the first channel,that is,the leakage area-CK4-CK3-S001 spring point.The monitoring results show that the natural attenuation process of oil pollutants in groundwater conforms to exponential attenuation characteristics.The tracer experiment showed that the concentration of pollutants and tracers decreased rapidly and the self-purification ability of groundwater was significantly improved under the artificial flushing situation.In addition,there is a negative correlation between groundwater pollution risk index and spring discharge in karst fault areas.The greater the spring discharge,the lower the concentration of oil pollutants in spring water,and the lower the pollution risk of groundwater.The research results can provide technical support for natural attenuation treatment and risk prevention and control of groundwater pollution from oil-bearing wastewater overflow in karst fault area.关键词
岩溶断层区/石油类污染/地下水/自净能力/污染风险Key words
karst fault area/petroleum pollution/groundwater/self-purification capacity/risk assessment分类
资源环境引用本文复制引用
宋建新,黄磊,吉勤克补子,江峰,焦恒..岩溶断层区含油废水溢流地下水污染风险评价[J].环境工程学报,2023,17(12):3960-3968,9.基金项目
国家重点研发计划资助(2022YFC3201705) （2022YFC3201705）
南方石山地区矿山地质环境修复工程技术创新中心开放课题(NFSS2023003) （NFSS2023003）
