摘要
为探究绝缘油污染土壤微波热脱附的影响条件,考察了温度、停留时间、土壤含水率、污染物初始浓度和微波功率对土壤中绝缘油去除效果的影响。结果表明,温度和停留时间显著影响土壤中绝缘油的去除率,在400℃、微波处理时间5 min的条件下,土壤中绝缘油的去除率为98.6%。当土壤含水率为5%时,土壤中绝缘油的去除率达到最佳。在微波处理15 min内,土壤中绝缘油的去除率随着绝缘油初始浓度的升高逐渐降低。微波功率越高,土壤中绝缘油的微波热脱附效率越高,综合考虑能耗和去除率,微波功率为1000 W时较优。绝缘油污染土壤微波热脱附机理研究表明,脂肪烃主要通过蒸汽蒸馏和热解吸两种方式从土壤中脱除。本研究结果可为高浓度绝缘油污染土壤微波热脱附技术应用提供参考。
In order to explore the influencing conditions of microwave thermal desorption of insulating oil contaminated soil,the effects of temperature,residence time,soil moisture content,initial concentration of contaminate and microwave power on the removal of insulating oil in soil were investigated.The results showed that temperature and residence time had significant effects on the removal rate of insulating oil.The removal rate of insulating oil in the soil reached 98.6%when treated at 400℃for 5 min.The removal rate of insulating oil reached the optimum when the moisture content was 5%.Within 15 minutes of microwave treatment,the removal rate of insulating oil gradually decreased with the increase of initial concentration.With the increase of microwave power,the thermal desorption efficiency of insulating oil showed an increasing trend.Considering the energy consumption and the removal rate,the microwave power of 1000 W was optimal.The experimental results of the microwave thermal desorption mechanism of insulating oil contaminated soil showed that aliphatic hydrocarbons were mainly removed from the soil by steam distillation and thermal desorption.This study can provide a reference for the application of microwave thermal desorption technology in soil contaminated by high concentration insulating oil.
作者
刘松涛
谷兴家
贾文波
曹悦
徐珺
车凯
郁金星
陈传敏
LIU Songtao;GU Xingjia;JIA Wenbo;CAO Yue;XU Jun;CHE Kai;YU Jinxing;CHEN Chuanmin(Department of Environmental Science and Engineering,North China Electric Power University(Baoding),Baoding 071003,China;Beijing Guodianfutong Science and Development Co.Ltd.,Beijing 100071,China;State Grid Hebei Electric Power Research Institute,Shijiazhuang 050021,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2021年第12期3974-3981,共8页
Chinese Journal of Environmental Engineering
基金
国家电网公司科技项目(5204DY19000A)。
关键词
微波热脱附
绝缘油
土壤污染
microwave thermal desorption
insulating oil
soil contamination
