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A Comparative Study on Enhanced Phytoremediation of Pb Contaminated Soil with Phosphate Solubilizing Microorganism(PSM) and EDTA in Column Reactor  

Nam, Yoon-Sun (Division of Ecoscience, Ewha Womans University)
Park, Young-Ji (Department of Civil & Environmental Engineering, Kyoungwon University)
Lee, In-Sook (Division of Ecoscience, Ewha Womans University)
Bae, Bum-Han (Department of Civil & Environmental Engineering, Kyoungwon University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.30, no.5, 2008 , pp. 500-506 More about this Journal
Abstract
Enhanced phytoremediation with EDTA or PSM(Phosphate solubilizing microorganism) was studied using green foxtail (Setaria viridis) in columns packed with 1,200 mgPb/kg contaminated soil to investigate the effects of EDTA or PSM on the plant uptake and vertical migration of Pb. EDTA, equimolar amount of total Pb in the column soil, was administered in two methods: the one was treated with 1/6 aliquots of the equimolar EDTA every week for 6 weeks and the other was treated with single dose of the equimolar EDTA before 14 days of harvest. The results showed that higher concentrations of Pb accumulated in the biomass of green fowtail after the chemical or biological treatment. The plant-root Pb concentration in PSM treatment(M), EDTA aliquot treatment(ES), and single dose treatment(E) was 2.6, 3.0, and 3.3 times higher, respectively, than that in the plant-root of control(164.7 mg/kg). The plant-stem Pb concentration in the M, ES and E treatment was 27, 37, and 40 times higher than that in the stem of control(8.1 mg/kg). The translocation factor, the ratio of shoot/root Pb concentration, was 0.6 in the two EDTA treatment, 0.5 in the M treatment, and 0.05 in the control, respectively. The largest amount of Pb was phyto-extracted in the E treatment whereas vertical migration of EDTA was significant in the ES treatment. This result showed that a single large dose of EDTA before harvest serves better for enhanced phytoremediation of Pb. Although, treatment with PSM showed less Pb phytoextraction by the plant but enhanced both the growth of plants in the column and microbial dehydrogenase activity in the soils. Therefore, enhanced phytoextraction of Pb with PSM treatment can be an alternative option for EDTA treatment, which is toxic to plants and soil ecosystem.
Keywords
EDTA; Pb; Phytoremediation; Phosphate Solubilizing Microorganism; Setaria viridis; Soil Column Reactor;
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