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Washing out heavy metals from contaminated soils from an iron and steel smelting site |
Guangxu ZHU1,2,Qingjun GUO1,*(),Junxing YANG1,Hanzhi ZHANG1,2,Rongfei WEI1,2,Chunyu WANG1,2,Marc PETERS1,Xiaoyong ZHOU1,Jun YANG1 |
1. Center for Environmental Remediation, Institute of Geographical Sciences and Natural Resources, Chinese Academy of Sciences, Beijing 100101, China 2. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Washing is a promising method for separating contaminants bound to the particles of soil ex-situ by chemical mobilization. Laboratory batch washing experiments were conducted using deionized water and varying concentrations of oxalic acid, citric acid, tartaric acid, acetic acid, hydrochloric acid and ethylenediaminetetra acetic acid (EDTA) to assess the efficiency of using these chemicals as washing agents and to clean up heavy metals from two heavily polluted soils from an iron and streel smelting site. The toxicity reduction index and remediation costs were analyzed, and the results showed that the soils were polluted with Cd, Pb and Zn. Hydrochloric acid and EDTA were more efficient than the other washing agents in the remediation of the test soils. The maximum total toxicity reduction index showed that 0.5 mol·L-1 hydrochloric acid could achieve the remediation with the lowest costs.
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Keywords
heavy metals
soil washing
toxicity reduction index
iron and steel smelting site
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Corresponding Author(s):
Qingjun GUO
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Online First Date: 22 May 2014
Issue Date: 25 June 2015
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