Leaching of Heavy Metals from Fly Ash Generated from Gasification and Melting Furnace for Municipal Solid Wastes by Organic Acids
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- Saito Chie
- Graduate School of Engineering, Tohoku University
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- Okada Haruki
- Faculty of Engineering, Tohoku University
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- Titus Monica Joy
- Environment Conservation Research Institute, Tohoku University
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- Yoshioka Toshiaki
- Graduate School of Environmental Studies, Tohoku University
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- Mizoguchi Tadaaki
- Environment Conservation Research Institute, Tohoku University
Bibliographic Information
- Other Title
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- 有機酸を用いた都市ごみガス化溶融飛灰からの重金属浸出
- ユウキサン オ モチイタ トシ ゴミ ガスカ ヨウユウ ヒカイ カラノ ジュウキンゾク シンシュツ
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Abstract
The leaching behavior of zinc, lead, and copper from fly ash generated in gasification and melting furnaces for municipal solid wastes (MSW) was studied by a constant pH leaching method with organic acids. The leaching degrees of the above-mentioned heavy metals were as low as 10%, or lower at pH 2 for the residue, obtained by leaching fly ash with water. The leaching degree of heavy metals increased remarkably with the addition of organic acids. The leaching degrees of zinc, lead, and copper were 64, 64 and 91%, respectively, under conditions where the concentration of citrate was as low as 0.001 M, and pH was 4. The citrate's effectireness in the leaching of heavy metals may be due to the catalytic acceleration action of dissolution, but not the stabilization effect for heavy metals in solution. The degree of leaching for zinc, lead, copper, and silicate decreased with the elevation of the reaction temperature from 25°C to 50°C. A constant pH leaching method with citrate has features such that high leaching degrees for heavy metals are obtained, and silicate gel, which is difficult to be filtered, is not generated.
Journal
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- Journal of the Japan Society of Waste Management Experts
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Journal of the Japan Society of Waste Management Experts 18 (3), 157-166, 2007
Japan Society of Material Cycles and Waste Management
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Details 詳細情報について
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- CRID
- 1390282680273847040
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- NII Article ID
- 10018760763
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- NII Book ID
- AN10414685
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- COI
- 1:CAS:528:DC%2BD2sXnvVGgtb8%3D
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- ISSN
- 1883163X
- 18831648
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- NDL BIB ID
- 8766195
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed