摘要
针对单一原位化学氧化和多相抽提技术难以达到氯苯类污染场地的修复目标,文章采用两者协同修复技术同时实现复杂场地氯苯类污染土壤和地下水的修复。以上海市某氯苯类污染场地为研究对象,分别开展多相抽提、原位化学氧化和两者协同修复研究,对比不同修复方式对污染土壤和地下水的修复效果。结果表明,单一的多相抽提和原位化学氧化修复技术均无法修复达标,协同处置后根据为期1年的长期监测结果,CJ1、CJ2、CJ3地下水氯苯类污染物质量浓度分别降低93.89%、93.39%和94.15%,CT1、CT2、CT3土壤氯苯类污染物质量分数分别降低74.17%、76.86%和76.23%,均低于修复目标值,协同修复效果具有较好的长期稳定性。多相抽提对重质非水相液体(DNAPL)物质的去除和原位化学氧化对溶解态污染物以及残余的DNAPL相物质的强化处理是显著促进氯苯类污染物去除的主要原因。该研究结果可为类似氯苯类污染场地修复治理工程提供参考。
Since it is difficult to achieve the remediation goal of chlorobenzene-contaminated sites by single in-situ chemical oxidation and multiphase extraction technology,the two synergistic remediation technologies are used to simultaneously remediate chlorobenzene-contaminated soil and groundwater in complex sites.Taking a chlorobenzene-contaminated site in Shanghai as the research object,multiphase extraction,in-situ chemical oxidation and synergistic remediation studies were carried out to compare the remediation effects of different remediation methods on contaminated soil and groundwater.The results showed that the single multiphase extraction and in-situ chemical oxidation remediation technology could not reach the remediation standard.According to the long-term monitoring results of one year after cooperative disposal,the mass concentration of chlorobenzene pollutants in groundwater of CJ1,CJ2,CJ3 were reduced by 93.89%,93.39%and 94.15%respectively,the mass fraction of chlorobenzene pollutants in the soil of CT1,CT2,CT3 were decreased by 74.17%,76.86%and 76.23%respectively,all of which were lower than the target value of remediation.The effect of collaborative repair has good long-term stability.The removal of Dense Non-Aqueous Phase Liquid(DNAPL)by multiphase extraction and the enhanced treatment of dissolved pollutants and residual DNAPL by in-situ chemical oxidation are the main reasons for significantly promoting the removal of chlorobenzene pollutants.The results of this study can provide a reference for the remediation projects of similar chlorobenzene-contaminated sites.
作者
陈窈君
CHEN Yaojun(Shanghai Academy of Environmental Sciences,Shanghai 200233,China;State Environmental Protection Engineering Center for Urban Soil Contamination Control and Remediation,Shanghai 200233,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2023年第2期1-9,共9页
Environmental Science & Technology
基金
上海市科技人才计划项目资助项目(19XD1434900)
关键词
氯苯类污染物
多相抽提
原位化学氧化
地下水
土壤
chlorobenzene pollutants
multiphase extraction
in-situ chemical oxidation
groundwater
soil
