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Adhesion of Escherichia coli to Quartz and Iron-coated Sands in the Presence of Phosphate  

Park, Seong-Jik (Environmental Biocolloid Engineering Laboratory, Seoul National University)
Lee, Chang-Gu (Environmental Biocolloid Engineering Laboratory, Seoul National University)
Kim, Hyon-Chong (Environmental Biocolloid Engineering Laboratory, Seoul National University)
Han, Yong-Un (Environmental Biocolloid Engineering Laboratory, Seoul National University)
Kim, Song-Bae (Environmental Biocolloid Engineering Laboratory, Seoul National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.30, no.6, 2008 , pp. 616-620 More about this Journal
Abstract
The aim of this study was to investigate the influence of phosphate on the adhesion of Escherichia coli to porous media. Column experiments were performed to examine the effect of phosphate on bacterial adhesion to quartz sand and iron-coated sand. Results showed that bacterial mass recovery in quartz sand decreased from 74.5 to 35.4% as phosphate concentration increased from 0 to 16 mg/L. This indicated that bacterial adhesion to quartz sand was enhanced with increasing phosphate concentration. This phenomenon is due to the increase of ionic strength. In contrast, the mass recovery in the coated sand increased from 2.9 to 26.0% as phosphate concentration increased. This indicated that bacterial adhesion to the coated sand was reduced with increasing phosphate concentration, due to the preoccupation of favorable adsorption sites and competitive adsorption by phosphate.
Keywords
Phosphate; Iron-coated Sand; Quartz Sand; Escherichia coli; Bacterial Adhesion;
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