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http://dx.doi.org/10.14249/eia.2020.29.5.350

Application of Nano Fe°-impregnated Biochar for the Stabilization of As-contaminated Soil  

Choi, Yu-Lim (Department of Environmental Engineering, Kwangwoon University)
Angaru, Ganesh Kumar Reddy (Department of Environmental Engineering, Kwangwoon University)
Ahn, Hye-Young (Department of Environmental Engineering, Kwangwoon University)
Park, Kwang-Jin (Daeil Engineering & Consulting CO., LTD)
Joo, Wan-Ho (Department of Environmental Engineering, Kwangwoon University)
Yang, Jae-Kyu (Department of Environmental Engineering, Kwangwoon University)
Chang, Yoon-Young (Department of Environmental Engineering, Kwangwoon University)
Publication Information
Journal of Environmental Impact Assessment / v.29, no.5, 2020 , pp. 350-362 More about this Journal
Abstract
In this study, nano Fe°-impregnated biochar (INPBC) was prepared using pruning residues and one-pot synthetic method and evaluated its performance as an amendment agent for the stabilization of arsenic-contaminated soil. For the preparation of INPBC, the mixture of pruning residue and Fe (III) solution was heated to 220℃ for 3hr in a teflon-sealed autoclave followed by calcination at 600℃ under N2 atmosphere for 1hr. As-prepared INPBC was characterized using FT-IR, XRD, BET, SEM. For the stabilization test of as-prepared INPBC, As-contaminated soils (Soil-E and Soil-S) sampled from agricultural sites located respectively near E-abandoned mine and S-abandoned mine in South Korea were mixed with different of dosage of INPBC and cultivated for 4 weeks. After treatment, TCLP and SPLP tests were conducted to determine the stabilization efficiency of As in soil and showed that the stabilization efficiency was increased with increasing the INPBC dosage and the concentration of As in SPLP extractant of Soil-E was lower than the drinking water standard level of Ministry of Environment of South Korea. The sequential fractionation of As in the stabilized soils indicated that the fractions of As in the 1st and 2nd stages that correspond liable and known as bioavailable fraction were decreased and the fractions of As in 3rd and 4th stages that correspond relatively non-liable fraction were increased. Such a stabilization of As shows that the abundant nano Fe° on the surface of INPBC mixed with As-contaminated soils played the co-precipitation of As leaching from soil by surface complexation with iron. The results of this study may imply that INPBC as a promising amendments for the stabilization of As-contaminated soil play an important role.
Keywords
biochar; stabilization; arsenic; iron nano-particles; soil;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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