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Enhanced Phytoremediation by Echinochloa crus-galli in Arsenic Contaminated Soil in the Vicinity of the Abandoned Mine  

Park, Ji-Yeon (Department of Environmental Science and Engineering, GIST)
Kim, Ju-Yong (Department of Environmental Science and Engineering, GIST)
Lee, Byung-Tae (Department of Environmental Science and Engineering, GIST)
Kim, Kyoung-Woong (Department of Environmental Science and Engineering, GIST)
Lee, Jin-Soo (Mine Reclamation Corp.)
Publication Information
Economic and Environmental Geology / v.43, no.2, 2010 , pp. 101-107 More about this Journal
Abstract
In order to deal with the problem that phytoremediation takes long time in achieving the practical effect, the enhanced phytoremediation by Barnyard grass (Echinochloa crus-galli) was conducted. In addition, we examined the synergistic effect by adding PSM (phosphate -solubilizing microbes) and EDTA (ethylenediaminetetraacetic acid) to the arsenic contaminated soil in the vicinity of the abandoned mine. The removal efficiency of arsenic in the site with PSM application increased about 16% when compared to control site, which was due to increase of plant biomass. The EDTA has been successfully utilized in respect of enhanced mobility and solubility of arsenic in the soil. As a result, BF (bioaccumulation factor) significantly increased but the inhibition of plant growth resulted in 20% reduction of arsenic removal efficiency. The application of PSM and EDTA may enhance the efficiency of phytoremediation. However, the time and method of EDTA application should be further examined to reach the maximum removal efficiency.
Keywords
Echinochloa crus-galli; phytoremediation; arsenic; PSM; EDTA;
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