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Attachment of Bacillus subtilis to Al-Fe Bimetallic Oxide-coated Sand : Effect of Oxyanions  

Park, Seong-Jik (Environmental Biocolloid Engineering Laboratory, Seoul National University)
Lee, Chang-Gu (Environmental Biocolloid Engineering Laboratory, Seoul National University)
Han, Yong-Un (Environmental Biocolloid Engineering Laboratory, Seoul National University)
Park, Jeong-Ann (Environmental Biocolloid Engineering Laboratory, Seoul National University)
Kim, Song-Bae (Department of Rural Systems Engineering.Research Institute for Agriculture and Life Sciences, Seoul National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.31, no.7, 2009 , pp. 515-520 More about this Journal
Abstract
This study investigated the influence of oxyanions (nitrate, carbonate, phosphate) on the attachment of bacteria (Bacillus subtilis) to Al-Fe bimetallic oxide-coated sand using column experiments. Results showed that bacterial attachment to the coated sand was independent of nitrate concentration. Bacterial mass recovery remained constant (10.9${\pm}$0.2%) with varying nitrate concentrations (0.1, 1, 10 mM). In case of carbonate, mass recovery increased from 25.6% to 39.0% with increasing carbonate concentration from 0.1 mM to 1 mM, and mass recovery also increased from 50.9% to 78.9% at the same concentration condition in case of phosphate. This phenomenon could be attributed to the hindrance effect of carbonate and phosphate to bacterial attachment to the coated sand. Meanwhile, with increasing carbonate/phosphate concentration from 1 mM to 10 mM, mass recovery decreased from 39.0% to 23.8% and from 78.9% to 52.6%, respectively. This phenomenon could be ascribed to the enhancement effect of free carbonate/phosphate ions present in solution phase due to increasing carbonate/phosphate concentration, which increase ionic strength and thus enhance bacterial attachment to the coated sand. In our experimental conditions, the effect of phosphate to bacterial attachment to the coated sand was the greatest among phosphate, carbonate, and nitrate.
Keywords
Bacterial Attachment; Coated Sand; Oxyanions; Nitrate; Carbonate; Phosphate;
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