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Humic substances as a washing agent for Cd-contaminated soils
作者: Meng, Fande1,2; Yuan, Guodong1; Wei, Jing1; Bi, Dongxue1,2; Ok, Yong Sik3,4; Wang, Hailong5,6,7
ISSN号: 0045-6535
出版日期: 2017-08-01
卷号: 181, 页码:461-467
关键词: Cadmium ; Calcium hydroxide ; Leonardite ; Soil remediation ; Soil washing
学科分类: 环境科学技术::环境学::土壤环境学
DOI: 10.1016/j.chemosphere.2017.04.127
通讯作者: 袁国栋
英文摘要: Cost-effective and eco-friendly washing agents are in demand for Cd contaminated soils. Here, we used leonardite-derived humic substances to wash different types of Cd-contaminated soils, namely, a silty loam (Soil 1), a silty clay loam (Soil 2), and a sandy loam (Soil 3). Washing conditions were investigated for their effects on Cd removal efficiency. Cadmium removal was enhanced by a high humic substance concentration, long washing time, near neutral pH, and large solution/soil ratio. Based on the tradeoff between efficiency and cost, an optimum working condition was established as follows: humic substance concentration (3150 mg C/L), solution pH (6.0), washing time (2 h) and a washing solution/soil ratio (5). A single washing removed 0.55 mg Cd/kg from Soil 1 (1.33 mg Cd/kg), 2.32 mg Cd/kg from Soil 2 (6.57 mg Cd/kg), and 1.97 mg Cd/kg from Soil 3 (2.63 mg Cd/kg). Cd in effluents was effectively treated by adding a small dose of calcium hydroxide, reducing its concentration below the discharge limit of 0.1 mg/L in China. Being cost-effective and safe, humic substances have a great potential to replace common washing agents for the remediation of Cd-contaminated soils. Besides being environmentally benign, humic substances can improve soil physical, chemical, and biological properties. (C) 2017 Elsevier Ltd. All rights reserved.
研究领域[WOS]: Environmental Sciences & Ecology
项目资助者: Chinese National Key Research and Development Program(2016YFD0200303) ; National Natural Science Foundation of China(21577131) ; Special Funding for the Introduced Innovative R&D Team of Dongguan Municipal Government(2014607101003) ; Key Research and Development Program of Shandong Province(2016CYJS05A01-1)
文章类型: Article
收录类别: SCI
语种: 英语
WOS记录号: WOS:000402343700052
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内容类型: 期刊论文
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作者单位: 1.Chinese Acad Sci, Shandong Prov Key Lab Coastal Environm Proc, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai Inst Coastal Zone Res YIC,YICCAS, Yantai 264003, Shandong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Kangwon Natl Univ, Sch Nat Resources & Environm Sci, Chunchon 24341, South Korea
4.Kangwon Natl Univ, Korea Biochar Res Ctr, Chunchon 24341, South Korea
5.Foshan Univ, Sch Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R China
6.Zhejiang A&F Univ, Key Lab Soil Contaminat Bioremediat Zhejiang Prov, Linan 311300, Zhejiang, Peoples R China
7.Guangdong Dazhong Agr Sci Co Ltd, Dongguan 523169, Guangdong, Peoples R China

Recommended Citation:
Meng, Fande,Yuan, Guodong,Wei, Jing,et al. Humic substances as a washing agent for Cd-contaminated soils[J]. CHEMOSPHERE,2017,181:461-467.
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