表面活性剂强化热脱附修复氯代烃污染土壤  

Surfactant enhanced thermal desorption remediation of chlorinated hydrocarbons contaminated soil

作　　者：诸毅 ZHU Yi(Shanghai Chengtou Environmental Ecological Remediation Technology Co.,Ltd.,Shanghai 200232)

机构地区：[1]上海城投上境生态修复科技有限公司,上海200232

出　　处：《环境污染与防治》2025年第4期15-20,I0001,I0002,共8页Environmental Pollution & Control

基　　金：上海市国有资产监督管理委员会企业技术创新和能级提升项目(No.2021011)。

摘　　要：热脱附是去除污染土壤中氯代烃(CHs)的有效方法,进一步提高热脱附效率能有效减少污染土壤修复成本。表面活性剂十二烷基苯磺酸钠(SDBS)被用于与热脱附耦合去除实际污染土壤中的三氯乙烯(TCE)和三氯苯(TCB)。结果表明,表面活性剂的加入提高了CHs的热脱附效率。尤其是在投加150 mg/g SDBS并于200℃热脱附2 h后,TCE和TCB去除率分别为99.61%和99.33%,表明添加表面活性剂能提高实际污染土壤中热脱附效率,降低热脱附修复污染土壤能耗。此外,SDBS耦合热脱附修复TCE和TCB污染土壤的性能与SDBS投加量和热脱附时间呈正相关关系。对TCE和TCB脱氯中间产物的分析表明,表面活性剂能促进CHs在热脱附过程中脱氯,形成多种脱氯产物并进一步在高温下从土壤中完全去除。Thermal desorption provides an efficient solution to remediate chlorinated hydrocarbons(CHs)contaminated soil.Enhanced desorption efficiency is desired to facilitate easier and less costly remediation.The surfactant sodium dodecylbenzene sulfonate(SDBS)was coupled with thermal desorption to remove trichloroethylene(TCE)and trichlorobenzene(TCB)from actual contaminated soil.The results indicated that the addition of surfactant improved the thermal desorption efficiency of CHs.Especially after 2 h of thermal desorption at 200℃with 150 mg/g SDBS,the removal efficiencies of TCE and TCB were 99.61%and 99.33%,suggesting that the addition of surfactant effectively promoted the desorption efficiency and reduced the energy consumption of thermal desorption for remediation of contaminated soil.In addition,the performance of SDBS-coupled thermal desorption for remediation of TCE and TCB contaminated soil were positively correlated with the dosage of SDBS and thermal desorption time.The analysis of TCE and TCB dechlorination intermediates revealed that the surfactant promoted the dechlorination of CHs during the thermal desorption process,forming various dechlorination products and further removing them completely from the soil at high temperature.

关 键 词：热脱附 氯代烃 土壤修复 表面活性剂 脱氯 

分 类 号：X53[环境科学与工程—环境工程]