Conditions for the precipitation of heavy metals from wastewater by the lime sulfurated solution (calcium polysulfide) process.
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概要
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A new chemical precipitation process utilizing CaS<I><SUB>x</SUB></I> solution as a single coagulant was tested for the removal of heavy metals from a batch stirred vessel. The precipitation of heavy metals from the simulated wastewater was investigated under varing conditions of pH, temperature, and heavy metal concentrations. Several agitating speeds were studied for the gases (atmospheric air and CO<SUB>2</SUB> gas) blown into the water to decompose the coagulant (CaS<I><SUB>x</SUB></I>). The findings are as follows: Heavy metal removal in keeping with the water quality standards in Japan was achieved for the simulated wastewater having pH's between 3 and 11, and the temperatures from 10 to 85 °C. The agitating speed for optimum removal was found to be 10 Hz. More than 250 ppm of the initial heavy metal concentration gives sufficient removal at stoichiometric quantities of coagulant, while less than 50 ppm of the initial concentration results in rather poor removal owing to the colloidal properties of the metal sulfide or hydroxide. For low concentrations of heavy metals, several units of the coagulant over stoichiometric amount are necessary for sufficient precipitation to achieve the water quality standards.
- 公益社団法人 日本化学会の論文
著者
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Yahikozawa Kiyochika
Department Of Fine Materials Engineering Faculty Of Textile Science And Technology
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Aratani Toshiro
Department Of Management And Information Sciences Hiroshima Prefectural University
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Yasuhara Shigeki
Department of Chemical Engineering, College of Engineering, University of Osaka Prefecture
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Matoba Hitoshi
Department of Chemical Engineering, College of Engineering, University of Osaka Prefecture
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Yano Takeo
Department of Chemical Engineering, College of Engineering, University of Osaka Prefecture
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