Reforming of Sludge Produced by Ferrite Process Treatment of Wastewater Containing Heavy Metal Ions and Citric Acid

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  • クエン酸共存下における重金属含有廃液のフェライト化処理によって生成するスラッジの改質
  • クエンサン キョウゾンカ ニ オケル ジュウキンゾク ガンユウ ハイエキ ノ

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Abstract

The saturated magnetization (σ) and density (ρ) of the ferrite sludge formed by two-step treatment of wastewater containing heavy metal (nickel sulfate) and citric acid were measured over a wide concentration range of citric acid. Simultaneously, the concentration of nickel and iron ions in treated water was measured. From the results of measurement, the effect of the two-step treatment on the parameters above listed was quantitatively discussed by comparing the three different process treatments: ordinary, excess-iron and two-step treatments. The σ-Ccit (concentration of citric acid) curves for three different treatments shift along Ccit axis with the order of ordinary, excess-iron and two-step treatment. The ferrite sludge formed by ordinary treatment was reformed to the sludge available for industrial utilization by two-step treatment. The concentrations of nickel and iron ions in treated water after two-step treatment were lower than that in treated water produced by ordinary or excess-iron treatments. The two-step treatment is favorable for steady operation of the ferrite process, industrial utilization of the sludge and good quality of the treated water.

Journal

  • ENVIRONMENTAL SCIENCE

    ENVIRONMENTAL SCIENCE 11 (3), 269-276, 1998

    SOCIETY OF ENVIRONMENTAL SCIENCE, JAPAN

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