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Environmental Engineering Research 2004;9(2): 96-102. DOI: https://doi.org/10.4491/eer.2004.9.2.096
ENHANCEMENT OF RDX REMOVAL BY IRON-REDUCING BACTERIA IN FLOW-THROUGH COLUMN
Byung-Taek Oh
School of Chemical Engineering, Seoul National University, San 56-1, Shinlim-dong, Gwanak-gu, Seoul 151-744, Korea
Corresponding Author: Byung-Taek Oh ,Tel: +82-2-880-7157, Fax: +82-2-876-8911, Email: btoh@snu.ac.kr
Received: March 6, 2004;  Accepted: April 3, 2004.
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ABSTRACT
Flow-through column apparatus were used to examine the reactivity of permeable reactive rusted iron barriers to clean up RDX-contaminated groundwater. Three columns were comprised of soil, rusted iron, and sand layers, and were fed with unlabeled plus '''C-labeled RDX to verify its removal efficiency under different conditions. One column was prepared with inert glass beads instead of rusted iron to serve as baseline to evaluate the benefits of rusted iron. The second column was used to determine if soil bacteria colonize the rusted iron layer. The third column was inoculated with iron-reducing bacteria, Shewanella algae BRY, to evaluate the reactivity of iron oxides, which participate in the RDX degradation through bioaugmentation. RDX was completely removed in rusted iron layer of all columns, and bioaugmented column showed highest l4C removal efficiency (approx. 90%) for 65 days. Dissimilatory iron-reducing bacteria such as Shewanella algae BRY may contribute to the reactivity of permeable reactive barrier through reductive dissolution and transforming oxides to more reactive forms.
Keywords: Bioaugmentation | Permeable Reactive Barriers | Zerovalent Iron | RDX | Shewanella algae BRY
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