Bacterial Flocculation with Sodium Bentonite

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The flocculation of Sporosarcina ureae suspension with sodium bentonite was investigated under various ionic environments. The results were as follows : 1)Bacterial flocculation with sodium bentonite gave settlable flocs at low pH and/or in the presence of Mg^<2+>.2)The electrophoretic mobilities of the bacteria and solium bentonite showed that both remained negatively charged in the pH range from 3 to 10,irrespective of the presence of Mg^<2+>.3) The separate flocculations of sodium bentonite and S. ureae showed that various salts caused flocculation of sodium bentonite in accordance with Schulze-Hardy law, while S. ureae showed a special flocculation pattern with the same salts. This behavior of S. ureae was probably due to the carboxy group of materials on the cell surface.4) The culture age of S. ureae in batch tests did not significantly influence flocculation.5) The effect of culture medium components was to allow flocculation of S. ureae by addition of sodium bentonite alone.The results suggested that, in the flocculation of S. ureae with sodium bentonite, Mg^<2+> or other multivalent metal ions play a mediatory role through base exchange on the functional groups of the cell surface material or on the surface of bentonite.
社団法人日本生物工学会の論文
1977-04-25