文献类型：期刊文献

中文题名：污染土壤中苯系物的热解吸

英文题名：Thermodesorption of BTEX-contaminated soil

作者：廖志强[1,2];朱杰[1];罗启仕[1];刘小宁[1,2];张长波[1];林匡飞[2]

机构：[1]上海市环境科学研究院,上海200233;[2]华东理工大学资源与环境工程学院,上海200237

年份：2013

卷号：32

期号：4

起止页码：646

中文期刊名：环境化学

外文期刊名：Environmental Chemistry

收录：CSTPCD;;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：环保部公益性项目污染土壤稳定固化及生物堆处理专项技术规范(201109019);上海市环保局重点项目上海市工业场地中挥发及半挥发性有机污染物的风险控制及规范(2012-07)资助

语种：中文

中文关键词：苯系物;热解吸;衰减常数;土壤

外文关键词：BTEX, thermodesorption, decay constant, soil.

摘要：以苯系物(BTEX)污染土壤为对象,研究温度和加热时间对土壤中污染物BTEX解吸的影响,初步探讨BTEX各污染物沸点与分子量大小和去除效率的关系.结果表明,随温度的提高,污染物BTEX的饱和蒸汽压也会随之增大,导致其在土壤中挥发性增强;采用一阶衰减模型计算BTEX热解吸的衰减常数,得出温度和加热时间可直接影响解吸过程;同时通过对BTEX各污染物去除率的比较,表明分子量越大,沸点越高的污染物,越不易被解吸出.通过加热可增强土壤中BTEX的热解吸,对热解吸现场小试的开展奠定了基础.
Theromodesoprtion, as physical remediation process, has unique properties such as simple design, high efficiency and short duration, and can be used to treat volatile and semi-volatile contaminated soil. In this contribution the BTEX-contaminated soil was considered as the research object, the influence of temperature and heating time on BTEX＇s desorption were studied, and the influence of BTEX＇s boiling point and molecular weight on its removal efficiency was explored. The results showed that the saturated vapor pressure of BTEX increased with temperature, leading to an enhance in volatilization. By using the first-order decay model the thermal desorption of BTEX exponential decay constant was calculated, showing that temperature and heating time can directly affect the desorption process. Compared with degradation of each BTEX compound, it was found that it was more difficult to parse out for the contaminants with the bigger molecular weight and the higher the boiling point. The results in this contribution confirmed that thermal desorption of BTEX could be enhanced by increasing the soil temperature, which could lay the foundation for the carrying out thermally enhanced vapor extraction experiments.