循环井耦合原位化学氧化技术对地下水中苯的修复效果研究  

Effectiveness of In-situ Chemical Oxidation Combined with Circulation Wells for Remediating Benzene in Groundwater

作　　者：李京澄 贾文娟 王锴 彭杨皓 程莉蓉[1] 牛耕 丁爱中[1] 王森杰[3] 王海立 林威 谷成功 徐华清 LI Jingcheng;JIA Wenjuan;WANG Kai;PENG Yanghao;CHENG Lirong;NIU Geng;DING Aizhong;WANG Senjie;WANG Haili;LIN Wei;GU Chenggong;XU Huaqing(Beijing Normal University,College of Water Science,Beijing 100875,China;Huadian Coal Industry Group Co.,Ltd.,Beijing 100035,China;Beijing No.4 Municipal Construction Engineering Co.,Ltd.,Beijing 100037,China)

机构地区：[1]北京师范大学水科学研究院,北京100875 [2]华电煤业集团有限公司,北京100035 [3]北京市市政四建设工程有限责任公司,北京100037

出　　处：《环境科学研究》2024年第11期2352-2361,共10页Research of Environmental Sciences

基　　金：国家自然科学基金项目(No.42472323);北京市自然科学基金(No.8232037)。

摘　　要：循环井耦合原位化学氧化技术是一种去除地下水中石油烃污染物的有效修复技术。本研究运用该技术修复苯污染场地,监测各修复阶段水样基本化学指标,获得不同修复阶段地下水中苯及理化指标(pH、电导率、溶解氧、氧化还原电位)的时空分布,并计算出氧化修复过程中污染区域苯的削减量,评估该技术对地下水中苯的修复效果。此外,依据美国环境保护局的健康风险模型评估修复前后场地的健康风险,计算地下水风险管控值,为场地风险管控提供建议。结果表明:①修复过程中,苯浓度与pH、溶解氧浓度和氧化还原电位均呈显著负相关,而与电导率呈正相关。②修复结束后,苯的削减量达230.15kg,场地的修复率达99.8%,大部分满足《地下水质量标准》(GB/T14848-2017)的Ⅲ类水标准。③修复结束后场地风险状况显著改善,非致癌风险完全解除,致癌风险显著降低;敏感性分析显示,饮水量和苯浓度对健康风险的敏感性较大;地下水致癌风险管控值为0.205mg/L,非致癌风险管控值为0.451mg/L。循环井耦合原位化学氧化技术在石油烃污染场地修复中取得了良好的修复效果,可为石油烃污染场地的修复提供参考。In-situ chemical oxidation combined with circulation wells is an effective method for removing petroleum hydrocarbon contaminants from groundwater.This study applies this technology to remediate benzene-contaminated sites,monitoring key chemical parameters in water samples throughout various stages of the remediation process.The research evaluates the temporal and spatial distribution of benzene and other physicochemical parameters(pH,electrical conductivity,dissolved oxygen,and redox potential)in groundwater during different remediation stages and quantitatively assesses benzene reduction in the contaminated areas.The effectiveness of this technology for benzene remediation is critically analyzed.Additionally,using the U.S.Environmental Protection Agency′s health risk model,this study assesses the health risks at the site before and after remediation.Groundwater risk control values are determined,and recommendations for site risk management are provided.The results showed that:(1)Benzene had a significant negative correlation with pH,dissolved oxygen,and redox potential,and a positive correlation with electrical conductivity during remediation.(2)After remediation,benzene removal efficiency reached 99.8%,reducing the benzene mass by 230.15 kg,with most of the site meeting the ClassⅢwater standard of the standard for Groundwater Quality(GB/T 14848-2017).(3)Health risks at the site improved significantly,with non-carcinogenic risk completely eliminated and carcinogenic risk significantly reduced.Sensitivity analysis revealed that drinking water volume and benzene concentration had a high sensitivity to health risks.The carcinogenic risk control value for groundwater was 0.205 mg/L,while the non-carcinogenic risk control value was 0.451 mg/L.Research indicates that the circulation well coupling in-situ chemical oxidation technology has achieved good remediation results in the remediation of petroleum hydrocarbon contaminated sites,which can provide a reference for the remediation of petroleum hydrocarbon contam

关 键 词：循环井 地下水 苯污染 健康风险 

分 类 号：X53[环境科学与工程—环境工程]