Effect of Organic Matter and Moisture Content on Reduction of Cr(Ⅵ) in Soils by Zerovalent Iron
2008
Yang, J.E. (Kangwon National University, Chuncheon, Republic of Korea) | Lee, S.J. (Kangwon National University, Chuncheon, Republic of Korea) | Kim, D.K. (Kangwon National University, Chuncheon, Republic of Korea) | Oh, S.E. (Kangwon National University, Chuncheon, Republic of Korea) | Yoon, S.H. (Kangwon National University, Chuncheon, Republic of Korea) | Ok, Y.S. (Kangwon National University, Chuncheon, Republic of Korea), E-mail: [email protected]
Current soil remediation principles for toxic metals have some limitations even though they vary with different technologies. An alternative technology that transforms hazardous substances into nonhazardous ones would be environmentally beneficial. Objective of this research was to assess optimum conditions for Cr(Ⅵ) reduction in soils as influenced by ZVI (Zero-Valent Iron), organic matter and moisture content. The reduction ratio of Cr(Ⅵ) was increased from 37 to 40% as organic matter content increased from 1.07 to 1.75%. In addition, Cr(Ⅵ) concentration was reduced as soil moisture content increased, but the direct effect of soil moisture content on Cr(Ⅵ) reduction was less than 5% of the Cr(Ⅵ) reduction ratio. However, combined treatment of ZVI (5%), organic matter (1.75%) and soil moisture (30%) effectively reduced the initial Cr(Ⅵ) to over 95% within 5 days and nearly 100% after 30 days by increasing oxidation of ZVI and concurrent reduction of Cr(Ⅵ) to Cr(Ⅲ). The overall results demonstrated that ZVI was effective in remediating Cr(Ⅵ) contaminated soils, and the efficiency was synergistic with the combined treatments of soil moisture and organic matter.
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