Complete stabilization of severely As-contaminated soil by a simple H2O2 pre-oxidation method combined with non-toxic TMT-15 and FeCl3&#183;6H2O

Chang-sheng Yue; Ben Peng; Wei Tian; Guang-hua Lu; Gui-bo Qiu; Mei Zhang

doi:10.1007/s12613-019-1819-4

Volume 26 Issue 9

Sep. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(9): 1105-1112

Chang-sheng Yue, Ben Peng, Wei Tian, Guang-hua Lu, Gui-bo Qiu, and Mei Zhang, Complete stabilization of severely As-contaminated soil by a simple H₂O₂ pre-oxidation method combined with non-toxic TMT-15 and FeCl₃·6H₂O, Int. J. Miner. Metall. Mater., 26(2019), No. 9, pp. 1105-1112. https://doi.org/10.1007/s12613-019-1819-4

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Chang-sheng Yue, Ben Peng, Wei Tian, Guang-hua Lu, Gui-bo Qiu, and Mei Zhang, Complete stabilization of severely As-contaminated soil by a simple H2O2 pre-oxidation method combined with non-toxic TMT-15 and FeCl3·6H2O, Int. J. Miner. Metall. Mater., 26(2019), No. 9, pp. 1105-1112. https://doi.org/10.1007/s12613-019-1819-4

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Research Article

Complete stabilization of severely As-contaminated soil by a simple H₂O₂ pre-oxidation method combined with non-toxic TMT-15 and FeCl₃·6H₂O

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Corresponding author:
Mei Zhang E-mail: zhangmei@ustb.edu.cn
Received: 18 October 2018; Revised: 20 December 2018; Accepted: 25 December 2018

Abstract

Abstract

The stabilization of severely As-polluted soil has been a challenge, especially for the extremely toxic As(Ⅲ) contaminants. In this study, soil with a high As concentration (26084 mg/kg) was availably stabilized by a H₂O₂ pre-oxidation assisted TMT-15 (Na₃S₃C₃N₃ solution with a mass fraction of 15%) and FeCl₃·6H₂O stabilization method. The results showed that the combination of the two stabilizers (i.e., TMT-15 and FeCl₃·6H₂O) presented a better stabilization behavior than either stabilizer used individually. The use of the H₂O₂ pre-oxidation assisted TMT-15 and FeCl₃·6H₂O stabilization approach not only converted the As(Ⅲ) to As(V) but also reduced the toxic leaching concentration of As to 1.61 mg/L, which is a safe level, when the additions of TMT-15 and FeCl₃·6H₂O were 2 mL and 0.20 g, respectively. Thus, using only a simple H₂O₂ pre-oxidation to combine clean stabilization with non-toxic stabilizers TMT-15 and FeCl₃·6H₂O could render the severely As-contaminated soil safe for disposal in a landfill.
- severely As-contaminated soil;
- non-toxic stabilizers;
- combining stabilization;
- pre-oxidation

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