文献类型：期刊文献

英文题名：Electrokinetic remediation of chromium (Cr)-contaminated soil with citric acid (CA) and polyaspartic acid (PASP) as electrolytes

作者：Fu, Rongbing[2];Wen, Dongdong[1];Xia, Xiaoqian[1];Zhang, Wei[1];Gu, Yingying[3]

机构：[1]East China Univ Sci & Technol, Sch Resource & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Tongji Univ, Coll Environm Sci & Engn, Shanghai 200092, Peoples R China;[3]China Univ Petr East China, Coll Chem Engn, Qingdao 266580, Shandong, Peoples R China

年份：2017

卷号：316

起止页码：601

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20170703351544);WOS:【SCI-EXPANDED(收录号:WOS:000398985200063)】；

基金：This research was supported by projects of the National Natural Science Foundation of China (41372262, 41371467, 41201303), and the Shanghai Pujiang Program (15PJD013).

语种：英文

外文关键词：Electrokinetic remediation; Chromium (Cr); Electrolytes; Temperature; Fractionation

摘要：In this study, the electrokinetic (EK) remediation of industrial soil contaminated by chromium (Cr) was explored using two electrolytes, citric acid (CA) and polyaspartic acid (PASP). All of the EK experiments were conducted in a 2-L soil cell reactor with a moisture level of 23.1% blended with a total Cr of 11.20 +/- 1.03 mg g(-1) under a constant voltage gradient (2 V cm(-1)) for 7 d. The experimental results showed that electric energy was wasted to heat up the soil in ER remediation as the soil temperature increased. The temperature difference in soil-cell positions was likely caused by a variety of soil characteristics, such as ionic strength. Compared with deionized water (DW), using CA in the contaminated soil was found to effectively improve the removal efficiencies of both the total Cr and Cr6+. However, using PASP only improved the Cr6+ removal efficiency, mainly because the CA and PASP could restore Cr6+ to Cr3+. When using both CA and PASP as electrolytes, the ce-OH and-COOH groups play a key role in chromium reduction. In the ER experiment, the relatively lower removal efficiency of the total Cr with PASP was partially due to the transformation of the exchangeable portion of Cr into carbon-bounded Cr. Carbon-bounded Cr has a lower migration rate than that of the exchangeable portion. Compared with the addition of DW, additional energy consumption was increased in the EK remediation after adding the two electrolytes to reach the same removal rates of Cr. Consequently, utilization efficiency of the accumulated electrical energy consumption decreased. (C) 2017 Elsevier B.V. All rights reserved.