有机污染场地土壤热解吸技术研究进展

Review on Thermal Desorption Technology for Organic Contaminated Site Soils

文章在总结国内外研究的基础上,介绍热解吸技术原理、分类及典型旋转干燥热解吸系统,重点梳理热解吸技术运行参数(加热温度、停留时间和载气)、土壤性质(质地、粒径、含水率和有机质)和污染物性质(种类、浓度和形态)对热解吸效率影响的研究现状,评述热解吸技术强化措施(添加剂、联合其他技术)、动力学研究(常用模型、研究现状)、热解吸后土壤性质变化及生态性评价,提出热解吸技术未来重点研究方向。

Thermal desorption technology has become the preferential remediation technology for the organic contaminated soils due to its high efficiency,short residence time and wide application range.Based on the previous work at home and abroad,this paper introduced the principle and the classification of the thermal desorption technology,and the typical rotary drying thermal desorption system was analyzed in detail.The research status of the effects of operating parameters(heating temperature,residence time and carrier gas),soil properties(texture,particle size,moisture content and organic matter)and contaminant properties(type,concentration and forms)on thermal desorption efficiency was summarized.Then the strengthening measures(additives and combination with other technologies)and the kinetic studies(common models and research status)for the thermal desorption technology and the soil property changes and its ecological evaluation after thermal desorption treatment were reviewed.Finally,some key research directions of the thermal desorption technology in the future were proposed.