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  • 迟克宇,李传维,籍龙杰,闫利刚,刘鹏,李书鹏,韦云霄.原位电热脱附技术在某有机污染场地修复中的应用效果[J].环境工程学报,2019,13(9):2049-2059.DOI:10.12030/j.cjee.201905110    [点击复制]
  • CHI Keyu,LI Chuanwei,JI Longjie,YAN Ligang,LIU Peng,LI Shupeng,WEI Yunxiao.Application effect of in-situ electric thermal desorption technology used in remediation at an organics-contaminated site[J].,2019,13(9):2049-2059.DOI:10.12030/j.cjee.201905110   [点击复制]
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原位电热脱附技术在某有机污染场地修复中的应用效果
迟克宇1,2, 李传维1,2, 籍龙杰1,2,3, 闫利刚1,2, 刘鹏1,2, 李书鹏1,2, 韦云霄1,2
0
(1. 北京建工环境修复股份有限公司,北京 100015;2. 污染场地安全修复技术国家工程实验室,北京 100015;3. 中国科学院生态环境研究中心,城市与区域国家重点实验室,北京 100085)
摘要:
以某退役化学试剂厂土壤及地下水中氯乙烯、顺-1,2-二氯乙烯、苯、氯苯为目标污染物,基于电热脱附技术开展了中试规模的修复研究。结果表明:经电热脱附处理后,土壤中氯乙烯、氯苯的平均去除率分别达到100%、99%,均低于北京市《场地土壤环境风险评价筛选值》中污染场地(住宅用地)中土壤筛选值;地下水中氯乙烯、顺-1,2-二氯乙烯、苯、氯苯的平均去除率分别为90.5%、93.5%、96.4%、99.3%。此外,加热井设计间距对土壤温度变化有明显影响,间距为3.0 m的加热井布设方案下的升温时间短且升温效果好,优于间距为4.0 m的加热井布设方案,但两者均可达到去除污染物的目标;加热边界有效热传递范围可达2.0 m;止水帷幕与加热边界的最佳间距至少为3.0 m;目标温度越高,热脱附时间越长,热脱附效率则越高。同时,还讨论了土壤含水率及渗透性等因素对脱附效果的影响。电热脱附技术对修复氯代烃类有机物污染场地具有良好的效果,可进行大规模的工程应用。
关键词:  热传导技术  原位修复  有机污染物  土壤和地下水修复
DOI:10.12030/j.cjee.201905110
投稿时间:2019-05-21
基金项目:政府间国际科技创新合作重点专项(2016YFE0102000)
Application effect of in-situ electric thermal desorption technology used in remediation at an organics-contaminated site
CHI Keyu1,2, LI Chuanwei1,2, JI Longjie1,2,3, YAN Ligang1,2, LIU Peng1,2, LI Shupeng1,2, WEI Yunxiao1,2
(1. Beijing Construction Engineering Group Environmental Remediation Co. Ltd., Beijing 100015, China;2. National Engineering Laboratory for Site Remediation Technologies, Beijing 100015, China;3. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China)
Abstract:
In this study, vinyl chloride, cis-1, 2-dichloroethylene, benzene in the chlorobenzene-contaminated soil and the corresponding groundwater from a retired chemical reagent factory were taken as the objects, the pilot test of in-situ electric thermal desorption technique was conducted to treat them. The results revealed that the average removal rates of vinyl chloride and chlorobenzene from the treated soil with in-situ electric thermal desorption reached 100% and 99%, respectively, the corresponding residual contents in the treated soils were lower than the screening levels for soil environmental risk assessment of sites (residential land) in Beijing. The average removal rates of vinyl chloride, cis-1, 2-dichloroethylene, benzene and chlorobenzene from groundwater were 90.5%, 93.5%, 96.4% and 99.3%, respectively. The distance between heating wells had the effect on the temperature variation. At the distance of 3.0 m, the heating time was shorter and the heating effect was better than that at the distance of 4.0 m, while both of them could achieve the goal of contaminants removal. The effective heat transfer range of the heating boundary reached 2.0 m, and the optimal spacing between the water-resisting curtain and the heating boundary was determined at least 3.0 m. The removal efficiency was positively correlated with heating temperature and thermal desorption time. Both longer time and higher efficiency for the thermal desorption occurred when higher target temperature was set. Meanwhile, the effects of soil moisture and porosity on the removal efficiency were discussed. The results indicate that the in-situ electric thermal desorption technology can be applied to remediate the site contaminated by chlorinated hydrocarbon organic pollutants in the large-scale practice.
Key words:  heat conduction technique  in-situ remediation  organic-contaminated site  soil and groundwater remediation