☆ 4.5 Article

In situ remediation of hexavalent chromium contaminated soil by CMC-stabilized nanoscale zero-valent iron composited with biochar

WATER SCIENCE AND TECHNOLOGY (2018)

Journal

WATER SCIENCE AND TECHNOLOGY

Volume 77, Issue 6, Pages 1622-1631

Publisher

IWA PUBLISHING

DOI: 10.2166/wst.2018.039

Keywords

biochar; Cr(VI)-contaminated soil; in situ remediation; stabilization of nanoscale zero-valent iron

Categories

Engineering, Environmental Environmental Sciences Water Resources

Funding

Guangdong Technology Research Centre for Ecological Management and Remediation of Urban Water Systems
National College Students Innovation and Entrepreneurship Training Program
Guangzhou External Science and Technology Cooperation Project [2016201604030002]
Guangdong Provincial Science and Technology Project [2016A020221029]

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Abstract

In this study, the remediation experiments were performed outdoors in natural conditions. Carboxymethyl cellulose (CMC)-stabilized nanoscale zero-valent iron (CMC-nZVI), biochar (BC) and CMC-stabilized nanoscale zero-valent iron composited with biochar (CMC-nZVI/BC) were synthesized and investigated for their effect on the in situ remediation of hexavalent chromium [Cr(VI)] contaminated soil and the concentration of available iron was tested after the remediation, compared with the untreated soil. The results of toxicity characteristic leaching procedure (TCLP) test showed that CMC-nZVI and CMC-nZVI/BC used as remediation materials could obviously improve the remediation rate of Cr contaminated soil and when the ratio of CMC-nZVI to Fe-0 was 2.5 g/Kg, the leachability of Cr(VI) and Cr-total can be reduced by 100% and 95.8% simultaneously. Moreover, sequential extraction procedure (SEP) showed that most exchangeable Cr converted to carbonatebound and Fe-Mn oxides-bound, reducing the availability and leachability of Cr in the soil.

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