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Humic substances as a washing agent for Cd-contaminated soils
Meng, Fande1,2; Yuan, Guodong1; Wei, Jing1; Bi, Dongxue1,2; Ok, Yong Sik3,4; Wang, Hailong5,6,7; Yuan GD(袁国栋)
Source PublicationCHEMOSPHERE
AbstractCost-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.
KeywordCadmium Calcium Hydroxide Leonardite Soil Remediation Soil Washing
Subject Area土壤环境学
Funding OrganizationChinese 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)
Indexed BySCI
WOS Research AreaEnvironmental Sciences & Ecology
WOS IDWOS:000402343700052
Citation statistics
Document Type期刊论文
Corresponding AuthorYuan GD(袁国栋)
Affiliation1.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
First Author AffilicationYantai Institute of Coastal Zone Research, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Meng, Fande,Yuan, Guodong,Wei, Jing,et al. Humic substances as a washing agent for Cd-contaminated soils[J]. CHEMOSPHERE,2017,181:461-467.
APA Meng, Fande.,Yuan, Guodong.,Wei, Jing.,Bi, Dongxue.,Ok, Yong Sik.,...&袁国栋.(2017).Humic substances as a washing agent for Cd-contaminated soils.CHEMOSPHERE,181,461-467.
MLA Meng, Fande,et al."Humic substances as a washing agent for Cd-contaminated soils".CHEMOSPHERE 181(2017):461-467.
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