硫酸アルミニウムによるOlisthodiscus sp.の除去とその機構〔赤潮プランクトンの除去に関する研究-1-〕

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Removal of Cells of Olisthodiscus sp. using alumining sulfate was studied by determining the solubility of Al in seawater under various pH conditions, and examining the direct application of aluminium sulfate to the cell suspension in a jar tester. The solubility of the Al desreased from pH 4.5. The minimum and maximum solubility was at pH 6.3 and pH 8.5 respectively. Above pH 8.5, solubility decreased. A pH buffer. action appeared when pH was 4.5-5.0, 8.5 and 10. The aluminium sulfate requirement and pH conditions for a 100% removal of 2×104 cells/ml were 50mg/l (4mg of A1/l) at the most and pH < 5.8 and pH > 9.5, respectively. These pH conditions were dependent on aluminium sulgate content. When 6.5 < pH < 8.5, only 10-30% rate of removal was obtained. From these results, it was suggested that the cell removal mechanism was mainiy due to disruption of cells followed by effective coagulation due to highly positive charged aluminium hydroxide when pH < 5.8, and positive charged magnesium hydroxide when pH < 9.5. The pH change alone or coprecipotation with aluminium hydroxide may not play any important role in the removal mechanism of the cells.
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