Combination of steam-enhanced extraction and electrical resistance heating for efficient remediation of perchloroethylene-contaminated soil:Coupling merits and energy consumption

作     者：Rui Yue Zhikang Chen Liujun Liu Lipu Yin Yicheng Qiu Xianhui Wang Zhicheng Wang Xuhui Mao Rui Yue;Zhikang Chen;Liujun Liu;Lipu Yin;Yicheng Qiu;Xianhui Wang;Zhicheng Wang;Xuhui Mao

作者机构：School of Resource and Environmental SciencesWuhan UniversityWuhan 430079China China State Science Dingshi Environmental Engineering CompanyBeijing 100020China 

出 版 物：《Frontiers of Environmental Science & Engineering》 (环境科学与工程前沿（英文）)

年 卷 期：2022年第16卷第11期

页      面：249-260页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：supported by the National Key R&D Program of China(No.2019YFC1805700) 

主　　题：Steam-enhanced extraction Electrical resistance heating Dense nonaqueous phase liquid Soil remediation Energy consumption 

摘      要：In situ thermal desorption(ISTD)technology effectively remediates soil contaminated by dense nonaqueous phase liquids(DNAPLs).However,more efforts are required to minimize the energy consumption of ISTD *** study developed a laboratory-scale experimental device to explore the coupling merits of two traditional desorption technologies:steam-enhanced extraction(SEE)and electrical resistance heating(ERH).The results showed that injecting high-density steam(1 g/min)into loam or clay with relatively high moisture content(13.3%)could fracture the soil matrix and lead to the occurrence of the preferential flow of *** ERH alone,the electrical resistance and soil moisture loss were critical factors influencing heating *** ERH and SEE were combined,preheating soil by ERH could increase soil permeability,effectively alleviating the problem of preferential flow of ***,steam injection heated the soil and provided moisture for maintaining soil electrical conductivity,thereby ensuring power stability in the ERH *** with ERH alone(8 V/cm)and SEE alone(1 g/min steam),the energy consumption of combined method in remediating perchloroethylene-contaminated soil was reduced by 39.3%and 52.9%,*** findings indicate that the combined method is more favorable than ERH or SEE alone for remediating DNAPL-contaminated subsurfaces when considering ISTD technology.