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Influence of phosphate on bacterial removal in columns of iron-coated sand
박성직 ( Seong Jik Park ),이창구 ( Chang Gu Lee ),김현정 ( Hyon Chong Kim ),한용운 ( Yong Un Han ),최낙철 ( Nag Chul Choi ),김성배 ( Song Bae Kim ) 대한상하수도학회 2007 공동추계 학술발표회 논문집 Vol.2007 No.-
This study investigated the bacterial adhesion to iron-coated sand, focusing on the effect of phosphate concentration on the removal of Escherchia coli. Bacterial mass recoveries decreased as phosphate solution increased from 76.7% to 34.1% over the range of specific phosphate concentration (0, 4, 16ppm) tested. This phenomenon can be attributed to the increment of ionic strength with increase of phosphate concentration, which results in the decrement of the thickness of the electrical double layer around the bacteria and coated sand surfaces. In iron-coated sand, however, bacterial mass recoveries increased from 2.7% to 29.2% as phosphate concentration increased. This result can be explained by phosphate adsorption. Phosphate forms inner-sphere complexes on iron-coated sand surfaces, which can lead to competitive adsorption with bacteria on iron-coated sand.