重金属含有廃水からのトランプエレメント分離と結晶成長およびケーキ濾過方式による処理

概要

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Much of sludge, which is produced by neutralization of the heavy metal ions containing wastewater from pickling and plating lines, is dumped out as industrial waste. To recycle the sludge as iron source, the tramp elements, such as nickel, zinc, must be separated from iron in the treatment of wastewater. This paper describes the experimental study on the separation of tramp elements using the crystal growth with pH control. The results are summarized as follows. Fe3+ ions are separated from the wastewater containing heavy metal ions as solid at pH4, and Ni2+, Zn2+ ions are separated at pH9. With the treatment of wastewater containing Ni2+ and Zn2+ ions using the crystallization reactor which has a cake filtration unit, the mean particle size increased into 35.5 μm by the crystallization. The growth of particle lowers the specific resistance of cake by two orders.
環境資源工学会の論文