Cadmium Removal from Scallop Mid-Gut Gland Wastes by Dilute Sufuric Acid Leaching and Electrowinning Processes.

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  • 希硫酸浸出／電解法によるホタテ貝中腸腺廃棄物（通称ウロ）からのカドミウムの除去
  • キリュウサン シンシュツ デンカイホウ ニ ヨル ホタテガイ チュウ チョウセン ハイキブツ ツウショウ ウロ カラ ノ カドミウム ノ ジョキョ

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Abstract

In order to recycle the organic waste of scallop mid-gut gland as fertilizer and fish meal, a novel removal process of cadmium contained in scallop mid-gut gland has been developed by using both dilute sulfuric acid leaching and electrowinning.<BR>In this investigation, cadmium removal degree from scallop mid-gut gland was examined under various leaching and electrowinning conditions.<BR>The experimental results obtained are summarized as follows:<BR>1) In advance, sample of scallop mid-gut gland waste was treated to eliminate greasy component because a cathode electrode plate in an electrowinning process was partially covered by the greasy component.<BR>2) The cadmium removal degrees by this process gave the high values from 97% to 98% for leaching time of 3 hours and electrowinning time of 5 hours under the following optimum conditions: sulfuric acid concentration is 0.54 mol/l or 0.9 mol/l, temperature 40°C or 60°C and electrowinning voltage 3.8V or 4.6 V.<BR>3) The cadmium concentration of scallop mid-gut gland waste was reduced to 5 ppm or less (based on dry weight) by this process, and scallop mid-gut gland waste was utilized as fertilizer and fish meal.<BR>4) A novel removal process of cadmium contained in scallop mid-gut gland waste was shown as a flow chart.<BR>5) In this process, cadmium deposits recovered on the cathode electrode plate during the electrowinning may be recycled as mineral resources.

Journal

  • RESOURCES PROCESSING

    RESOURCES PROCESSING 49 (3), 134-140, 2002

    The Resources Processing Society of Japan

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