Reforming of Sludge Produced by Ferrite Process Treatment of Wastewater Containing Heavy Metal Ions and Phosphate.

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  • リ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
  • リンサン 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 フ

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Abstract

The saturated magnetization (σ) of the ferrite sludge formed by two-step treatment of wastewater containing heavy metal (cadmium sulfate) and potassium dihydrogen phosphate was measured over a wide concentration range of potassium dihydrogen phosphate. Simultaneously, the concentration of cadmium and iron ions in treated water was measured. From the results of measurement, the effect of the two-step treatment on the above parameters was quantitatively discussed by comparing the three different process treatment : conventional, excess-iron and two-step treatments.<br>The σ value of ferrite sludge formed by the two-step treatment was larger than that by conventional treatment in phosphate ion concentration above 330 mg·l-1. The ferrite sludge formed by conventional treatment was reformed to the sludge from which cadmium ion was not easily eluted by the ferrite coating effect of two-step treatment. The pre-treatment by sodium hydroxide was effective in removing phosphate ion and increasing the σ of ferrite sludge. The concentration of cadmium ions in treated water produced by ferrite process was lower than that in treated water produced by neutralization method. 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.

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