Preparation of a silicon-iron amendment from acid-extracted copper tailings for remediating multi-metal-contaminated soils
Mu, Jing; Hu, Zhengyi; Huang, Lijuan; Xie, Zijian; Holm, Peter E.
刊名ENVIRONMENTAL POLLUTION
2020-02
卷号257页码:1-20
关键词Silicon-iron amendment Thermal activation Multi-metal-contaminated soils Remediation
ISSN号0269-7491
英文摘要Industrial by-products provide materials for remediation measures. In this study, a silicon-iron amendment was prepared from residue originating from acid-extracted copper (Cu) tailings based on thermal activation at temperatures ranging from 550 degrees C to 1150 degrees C for 30 min with the use of additives (CaO, Na2CO3, NaOH). The remediation performance of the amendment was evaluated through soil incubation and greenhouse pot experiments with vetiver (Vetiveria zizanioides). The results showed that the highest levels of soluble Si (6.11% of the total Si) and Fe (2.3% of the total Fe) in the amendment were achieved with thermal activation at 1150 degrees C for 30 min using an optimal ratio between residue and additives (residue: CaO: Na2CO3: NaOH =1: 0.4: 0.4: 0.2). Heavy metal release indicated that the amendment could be safely used for soil remediation. The incubation experiments showed that the DTPA-extractable Cd, Cr and Pb in contaminated soils decreased with increasing amendment rate, which was not observed for As. The amendment-induced decrease in the Cd, Cr and Pb availability in contaminated soils could be explained by pH-change induced immobilization, Fe-induced chemisorption, Si-induced co-precipitation, and Ca-induced ion exchange. Correlation analysis suggested that there were significant negative correlations between DTPA-extractable Cd, Cr and Pb and the pH, Fe, Si, and Ca in soil pore water and soil. The most suitable amendment rate was determined to be 1% by balancing the efficacy and wise utilization of the amendment. The pot experiment demonstrated that the amendment promoted the vetiver growth and stimulated the accumulation of Cd and Cr in the roots. The amendment was proved to be promising for the phytostabilization of Cd, Cr and Pb in contaminated soils. Further investigations are required to determine whether the amendment is a tool for the long-term remediation of multi-metal-contaminated soils at the field scale. (C) 2019 Elsevier Ltd. All rights reserved.
内容类型期刊论文
源URL[http://ir.rcees.ac.cn/handle/311016/44979]  
专题生态环境研究中心_环境水质学国家重点实验室
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GB/T 7714
Mu, Jing,Hu, Zhengyi,Huang, Lijuan,et al. Preparation of a silicon-iron amendment from acid-extracted copper tailings for remediating multi-metal-contaminated soils[J]. ENVIRONMENTAL POLLUTION,2020,257:1-20.
APA Mu, Jing,Hu, Zhengyi,Huang, Lijuan,Xie, Zijian,&Holm, Peter E..(2020).Preparation of a silicon-iron amendment from acid-extracted copper tailings for remediating multi-metal-contaminated soils.ENVIRONMENTAL POLLUTION,257,1-20.
MLA Mu, Jing,et al."Preparation of a silicon-iron amendment from acid-extracted copper tailings for remediating multi-metal-contaminated soils".ENVIRONMENTAL POLLUTION 257(2020):1-20.
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