摘要
以典型有机污染物4-硝基酚(4-nitrophenol,4-NP)和六氯苯(hexachlorobenzene,HCB)污染土壤为处理对象,采用高效吸收微波且保温性能良好的碳化硅材料制成圆柱状装土容器,研究以微波为热源、碳化硅为热传导材料的微波修复设备对污染土壤的修复效果.结果表明,该设备对土壤中有机污染物有较好的去除效果,30 min内去除率均可达到90%以上.有机物的去除不仅是由于碳化硅被加热后的热传递效应,且透过容器的部分微波也可直接作用于污染土壤.实验考察了微波辐照时间、污染物初始浓度、土壤量及含水率、敏化剂等因素对修复效果的影响.辐照时间、土壤量和含水量显著影响土壤升温行为和污染物去除率,而污染物初始污染浓度对去除率影响较小.与马弗炉加热处理效果进行了比较,表明微波加热修复技术在土壤的升温速率及有机物去除率方面均有显著优势.
A cylindrical soil container,made of silicon carbide（SiC） with strong microwave absorption and good heat preservation properties,was applied to microwave remediation of organic contaminated soils.The remediation of 4-NP and HCB contaminated soils by the microwave remediation equipment with SiC as heat conduction materials was studied.The results showed that the pollutants removal rate all reached over 90% in 30 minutes.The pollutants were removed not only because of the heating effect caused by SiC absorbing microwave energy,but also on account of microwave radiation directly.The factors influencing microwave remediation were inverstigated,and it showed that soil mass,radiation time and moisture had great effects on the soil heating rate and the removal while the initial concentration had little influence.Compared with the traditional heating by muffle furnace,a distinct advantage of microwave heating was revealed on soil heating rate and removal rate.
出处
《环境化学》
CAS
CSCD
北大核心
2013年第8期1560-1565,共6页
Environmental Chemistry
基金
国家高技术研究发展计划(863计划)(2012AA06A304)
华中科技大学自主创新研究基金(2012QN126
2011TS064)资助
作者简介
通讯联系人，Tel：027—87792159；E-mail：chenjing@mail．hust．edu．cn
