微量重金属イオンの凝集除去と共存フルボ酸との関係

概要

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The effectiveness of Cu^<2+>, Cd^<2+> and Zn^<2+> removal from extremely diluted solution by inorganic coagulant such as alum and ferric chloride was measured with fulvic acid present and absent. A factorial experimental design and analysis of variance were used to determine the effect on heavy metal ion removal of the individual variables pH, heavy metal ion concentration, coagulant concentration and fulvic acid concentration and their combinations. The fulvic acid used in the experiment was separated from lake deposit by means of Schnitzer & Skinner's method applying ion-exchange resin process. The analyses of variance showed that the most effective variable was the pH, followed by the coagulant concentration and their combination among the variables under consideration. The presence of fulvic acid appeared to rather enhance the heavy metal ion removal in most experiments. Under the experimental condition in diluted concentration of coagulant added, the fulvic acid acted to lower the heavy metal ion removal effects. Consequently, the interactive effect observed between coagulant concentration and fulvic acid concentration had to be examined more carefully from view points of metal ion complex formation with fulvic acid in water. The concentration of heavy metal ion ranging from 500 to 1000 ppb did not give any remarkable influence on the removal effects.
山梨大学の論文