脱窒菌のコロイド化学的性質

概要

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In order to elucidate the effects of the solutes contained in waste waters; inorganic electrolytes and organic compounds, on the flocculation behavior and the denitrifying function of the denitrifiers that are employed in the biological denitrifying processes at the water purification plants. In the study, three kinds of denitrifiers which were gathered and cultured in Uenohara City, Yamanashi Prefecture; Pseudomonas aeruginosa(a bacillus with flugela), Alcaligenes sp(a bacillus with flugela), and Paracoccus sp(a bacillus without flugela) were used. Every denitrifier is Gram-negative and is negatively charged. Flocculation effects of inorganic electrolyte against the negatively charged bacterium sols followed the Shulze-Hardy rule. Among the inorganic ions, trivalent cations such as Al3+, Fe3+ caused strong flocculation. Some cationic organic matters such as Methylene Blue (a cationic dye) and benzalkonium chloride (a cationic detergent) adsorb on the cell surface by electrostatic force of attraction, resulting in the bacterium flocculation and also the extinction of the denitrifiers themselves by the well-known their action of disinfectant. As a result, under the conditions in waste waters in which higher the dispersibility of the denitrifiers, better the denitrifying function act with a high denitrifying rate.
2009-03-31