郯城某化工厂周边地下水污染现状调查与评价

Investigation and Evaluation of Groundwater Pollution around a Chemical Plant in Tancheng Country

化工类污染源危害性大,明确其对周边地下水环境的影响,是进行地下水环境质量评估、保障饮用水源安全的基础。在对郯城某化工厂周边地下水环境质量进行高精度调查的基础上,通过对152个地下水监测点位、214个监测指标进行分析,开展了该区域地下水环境质量和污染现状调查与评价,并提出了相应的地下水污染防控措施。结果表明:该研究区3个含水层地下水均存在严重的复合有机物污染,四氯化碳、1,1,2,2-四氯乙烷检出率均在80%以上;由浅至深3个含水层地下水样点中超过饮用水水质指标限值的监测点位的占比分别为91.46%、76.92%和83.87%;四氯化碳的超标倍数最大,是该区域地下水中的主要污染物;根据该区域地下水中污染物的分布特征,建议对该区域地下水采取抽出处理和渗透性反应墙技术进行修复,并控制地下水污染羽的范围,以避免对下游水源地保护区造成危害。

Chemical pollution sources are highly harmful. Defining the impact of chemical pollution sources on the surrounding groundwater environment is the basis for conducting groundwater environmental quali ty assessment and ensuring the safety of drinking water sources. Based on the investigation of high preci sion groundwater environmental quality around a chemical plant in Tancheng Country,this paper analyzes 152 groundwater monitoring points and 214 monitoring indexes, carries out the investigation and evaluation of regional groundwater environmental quality and pollution status, and puts forward the corresponding measures of groundwater pollution prevention and control. The result shows that three aquifers in this area have been polluted by combined organic compounds seriously; the detection rates of carbon tetrachloride and 1,1,2,2 tetrachloroethane are both above 80%;the proportion of samples with index value exceeding drinking water limit are up to 91.46% ,76.92% and 83.87% in three aquifers ftom top to bottom,respectively;carbon tetrachloride is the main pollutant in groundwater,with the highest over standard multiple. According to the distribution of pollutants in groundwater, it is suggested to take pump and treat technique and permeable reactive barriers to control the pollution in time to avoid serious harm on wellhead protec tion zone downstream.