农业环境科学学报Issue(6)：1076-1081,6.DOI:10.11654/jaes.2015.06.009
用酒石酸等有机酸清洗镉锌、镉镍复合污染土壤
Remediation of Soils Co-contaminated with Cd-Zn and Cd-Ni by Washing with Oranic Acids
摘要
Abstract
Soil flushing is one of remediation techniques for metals contaminated soils. Here an effective soil washing process was studied in two metal-contaminated sites, namely soil A, which was polluted by Cd and Zn, and soil B, which was polluted by Cd and Ni. A two-step washing method using oxalic acid combined with four different acids, such as acetic acid, citric acid, tartaric acid and succinic acid, was e-valuated in terms of removal of bioavailable portion of heavy metals. In addition, soil washing with citric acid or tartaric acid alone was con-ducted. Enhancing effect of ultrasonic wave on metal washing by tartaric acid was also investigated. Results showed that the removal effi-ciencies of two-step washing process using citric acid or tartaric acid(0.1 mol·L-1, for 16 h)and oxalic acid(0.2 mol·L-1, for 16 h)sequen-tially were the highest. Under tartaric acid alone (0.1 mol·L-1, t=2 h), the removal of Cd, Zn and Ca was respectively 30.74%, 25.59%, and 15.86%for soil A, while that of Cd, Ni and Ca was respectively 47.36%, 6.89%, and 23.92%for soil B. Tartaric acid was an efficient wash-ing agent with high heavy metals removal capacity but low Ca leaching. The introduction of ultrasonic wave enhanced the removal efficien-cies of heavy metals in tartaric acid washing system, which shortened the washing time from 2 h to 30 min. The findings show that it is possi-ble to develop an environmentally friendly soil washing technique for heavy metals contaminated soils.关键词
重金属/土壤清洗/酒石酸/超声波Key words
heavy metals/soil washing/tartaric acid/ultrasonic wave分类
资源环境引用本文复制引用
吴俭,潘伟斌,林瑞聪,赖彩秀,詹淑威..用酒石酸等有机酸清洗镉锌、镉镍复合污染土壤[J].农业环境科学学报,2015,(6):1076-1081,6.基金项目
广东省中山市科技计划项目 （）
