摘要
采用微波热修复技术处理石油烃污染土壤,考察微波功率、作用时间、含水率对处理效果的影响。并通过添加活性炭、铁粉、氧化铝、二氧化钛和过硫酸钠5种敏化剂进行微波增强热修复研究。结果表明,当微波功率700 W,微波辐照时间10 min,土壤含水率10%,石油烃去除率最高可达31.90%;添加5种敏化剂后,石油烃去除效果显著提高,在最佳投加量10%氧化铝、15%铁粉、2.5%二氧化钛和20%过硫酸钠,石油烃去除率分别为78.1%,65.7%,50.4%和90.8%;活性炭为最优敏化剂,在5%投加量下,石油烃去除率可以达到91.4%,温度可达566.1℃。微波热修复去除石油烃主要机制为:敏化剂的添加可增大土壤的介电常数和损耗系数,增强污染土壤体系对微波的吸收和传热能力,依靠土壤中水分的微波蒸汽蒸馏和蒸发作用,使得石油烃在微波辐照场中受热挥发、分解。
Microwave thermal remediation technology was used to treat petroleum hydrocarbon contaminated soil,the effects of microwave power,reaction time and water content were investigated and microwave enhanced thermal remediation experiments were carried out by adding five kinds of sensitizers:activated carbon,iron powder,alumina,titanium dioxide and sodium persulfate.The results showed that when the microwave power is 700 W,the action time 10 min and the water content 10%,the degradation rate of petroleum hydrocarbons can reach 31.90%.And by adding five kinds of sensitizers,the rate of degradation of petroleum hydrocarbons has increased dramatically.At the optimum dosage,the removal rates of petroleum hydrocarbons were 78.1%,65.7%,50.4%and 90.8%respectively by adding 10%alumina,15%iron powder,2.5%titanium dioxide and 20%sodium persulfate;Activated carbon as the experimental optimal sensitizer,the petroleum hydrocarbon removal rate can reach 91.4%and the temperature can reach 566.1℃under the 5%dosage.Therefore the main mechanism of microwave thermal remediation for the degradation of petroleum hydrocarbons as follows:the addition of sensitizer can increase the dielectric constant and loss coefficient of soil,enhance the absorption and heat transfer capacity of contaminated soil system to microwave,the microwave steam distillation and evaporation of the water causes the petroleum hydrocarbons to be volatilized and decomposed by heat in the microwave irradiation field.
作者
陈维墉
朱雷鸣
胡敏
胡林潮
陈婕
张文艺
CHEN Wei-yong;ZHU Lei-ming;HU Min;HU Lin-chao;CHEN Jie;ZHANG Wen-yi(School of Environmental and Safety Engineering,Changzhou University,Changzhou 213164,China;SINOPEC Guangzhou Engineering Co.,Ltd.,Guangzhou 510620,China)
出处
《应用化工》
CAS
CSCD
北大核心
2020年第8期1995-1998,2003,共5页
Applied Chemical Industry
基金
江苏省地矿局科技计划项目(2015-KY-2)
中石化科技项目(319005-7)。
关键词
石油烃
污染土壤
微波热修复
敏化剂
petroleum hydrocarbons
contaminated soil
microwave thermal remediation
sensitizer
