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KMID : 0380020060210060428
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Korean Journal of Biotechnology and Bioengineering
2006 Volume.21 No. 6 p.428 ~ p.432
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Effect of Sulfate Source on Removal Efficiency in Electrokinetic Bioremediation of Phenanthrene-Contaminated Soil
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Kim Sang-Joon
Park Ji-Yeon
Lee You-Jin
Yang Ji-Won
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Abstract
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This study investigated the effect of sulfate source on removal efficiency in electrokinetic bioremediation which needs sulfate to degrade contaminants by an applied microorganism. The representative contaminant and the applied microorganism were phenanthrene and Sphingomonas sp. 3Y, respectively. When magnesium sulfate was used, the magnesium ion combined with hydroxyl ion electrically-generated at cathode to cause the decrease of electrolyte pH, and then the microbial activity was inhibited by that. When ammonium sulfate and disodium sulfate were used to solve the pH control problem, the pH values of electrolyte and soil solution were maintained neutrally, and also the high microbial activity was observed. With the former sulfate source, however, ammonium retarded the phenanthrene degradation, and so the removal efficiency decreased to 12.0% rather than 21.8% with magnesium sulfate. On the other hand, the latter improved the removal efficiency to 27.2%. This difference of removal efficiency would be outstanding for an elongated treatment period.
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KEYWORD
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Sulfate source, electrokinetic bioremediation, phenanthrene, Sphingomonas sp. 3Y, microbial activity
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