Removal of cadmium from scallop processing waste by washing with weak acid solution and utilization of useful constituents for organic fertilizer manufacturing |
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Authors: | Huifeng Ren Yuichi Okamoto Huijuan Jia Ryoji Fukuda Atsushi Kobayashi Sumio Goto Hideaki Endo Tetsuhito Hayashi |
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Institution: | Department of Ocean Science, Tokyo University of Marine Science and Technology, Minato-ku, Tokyo 108-8477,;Taisei Nozai, Naka-ku, Hiroshima-shi, Hiroshima 730-0017,;Research Institute, Telnite, Yoshikawa-shi, Saitama 342-0045, and;College of Environmental Health, Azabu University, Sagamihara, Kanagawa 229-8501, Japan |
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Abstract: | ABSTRACT: Hepatopancreases were washed four times with 2% acetic acid solution. In both the washed hepatopancreases and the supernatant of the washing solution, the residual cadmium (Cd) concentration was in accordance with the required standard for organic fertilizers. Hepatopancreases do not naturally contain high levels of nitrogen, but they do contain several amino acids which are useful for cultivation, and these were retained during the washing process. Although the condensed precipitate of the washing solution contained a considerable amount of Cd, Cd elution levels at the time of final disposal met judgment standard for special management industrial waste as a result of kneading and immobilizing with chelating adsorbent for treatment of contaminated soil. The volume of the precipitate of the washing solution was one-fifth of the original hepatopancreas, and the solid waste was suitable for burial at a final disposal site without further treatment. |
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Keywords: | amino acid cadmium final disposal immobilization organic fertilizer recycle scallop waste |
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