A Study on Purification of the Cleaning Waste in Water-Ethanol Solvent Mixtures

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  • WATANABE Noriko
    College of Human and Environmental Studies, Kanto Gakuin University

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  • 水／エタノール系洗浄廃液の浄化に関する検討
  • ミズ エタノールケイ センジョウ ハイエキ ノ ジョウカ ニ カンスル ケントウ

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From the standpoint of the purification in a cleaning liquid waste, the property of adsorption was investigated on activated carbons in various water-ethanol solvent mixtures containing dyes. The adsorption isotherms of five kinds of dyes (acid dye and oil color) on fibrous and powdery activated carbons with different specific surface areas were measured in various water-ethanol solvent mixtures and adsorption experiments were carried out using an incubator at 25°C. The main results obtained are summarized as follows : The amount of adsorption was observed in the order of specific surface area of activated carbons. The adsorption isotherms of dyes on fibrous activated carbons were of a typical Freundlich type in various ethanol concentrations. In 50 vol% ethanol solvent, the degree of adsorption decreased in the order of Sudan I>Acid Red 88>Acid Orange 7>Acid Red 27>Acid Red 112, and the degree of adsorption of oil color (Sudan I) was larger than that of water-soluble dyes and the latter decreased by increasing the number of sulfonic acid groups. As to the effect of ethanol concentration (50 and 100 vol%), the degree of adsorption on fibrous activated carbons at 100 vol% ethanol was higher than that at 50 vol% ethanol in water-soluble dyes, but the reverse was true for an oil color.

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