Kinetic studies on the lime sulfurated solution (calcium polysulfide) process for removal of heavy metals from wastewater.
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概要
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A new process has been developed for wastewater purification, utilizing "Lime Sulfurated Solution" as a coagulant. Calcium polysulfide, the main component of this solution, decomposes in water on contact with a gas (atmospheric air or CO<SUB>2</SUB> gas) and reacts with heavy metals. The heavy metals are removed as practically insoluble precipitates. The kinetics of this process were studied in a batch stirred tank vessel to obtain the fundamental data needed for development of a commercial continuous process. The findings are as follows: (1) Processing of bivalent metals Hg<SUP>2+</SUP>, Cd<SUP>2+</SUP>, Zn<SUP>2+</SUP>, Pb<SUP>2+</SUP>, and Cu<SUP>2+</SUP> are completed in a few minutes to achieve the water quality standards in Japan. (2) Cr<SUP>3+</SUP> is flocculated as Cr(OH)<SUB>3</SUB> by the strong alkaline base of CaS<I><SUB>x</SUB></I> solution. It takes about 60 minutes for the precipitation with CO<SUB>2</SUB> blowing, and 30 min with aeration. Cr(VI) is quickly reduced to Cr<SUP>3+</SUP> and removed as Cr(OH)<SUB>3</SUB>. (3) A simulated wastewater simultaneously contaminated with 6 kinds of heavy metals can be brought well within the standards within 20 min of processing time.
- 公益社団法人 日本化学会の論文
著者
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Ito Ryuzo
Department Of Acupuncture/moxibustion Tsukuba College Of Technology
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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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Yano Takeo
Department of Chemical Engineering, College of Engineering, University of Osaka Prefecture
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Sudo Takataro
Department of Chemical Engineerings, College of Textile Science and Technology, Shinshu University
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