土壌廃棄物を用いた排水中の重金属の吸着除去

概要

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Adsorption treatment by chelate resin is widely used to remove toxic heavy metal ions from waste water. However, chelate resin is expensive and also disposed after use. Thus, alternative low-cost heavy metal adsorbent is required. On the other hand, hydroclassification technique is a conventional preliminary treatment to treat contaminated soil, which separates heavily contaminated fine particles from the site and reduces the amount of soil to be treated. But separated fine soil is disposed to landfill site in many cases because it is difficult to remove heavy metals from fine soil particles, which strongly adsorb heavy metals. Thus, by utilizing separated fine soil as heavy metal adsorbent, it is expected to promote reuse of soil wastes and reduce cost of waste water treatment.In this paper, adsorption of lead and cadmium ions on hydroclassified lead contaminated soil was investigated. The effect of treatment procedure and co-existing cations on removal of heavy metal ions was examined. It was clarified that calcium ion and low pH obstruct heavy metal adsorption. Residual lead concentration was reduced below environmental standard despite high concentration of obstructive cations. Cadmium concentration was also reduced, but environmental standard was cleared only when concentration of obstructive cations was low.
社団法人資源・素材学会の論文
2008-08-25