Mechanisms for the aging-induced reduction of lead solubility in scrubber residues from municipal solid waste combustion

Takayuki Shimaoka, Kentaro Miyawaki, Masashi Soeda, Masataka Hanashima, Tsuneyuki Yoshida, Toshihito Uchida, Kevin H. Gardner, T. Taylor Eighmy

研究成果: ジャーナルへの寄稿記事

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This manuscript elucidates the mechanisms responsible for aging-induced reduction in lead leaching from scrubber residues. Leaching tests (JLT13) were conducted on 48 types of scrubber residues and lead solubility was found to be significantly reduced independent of incinerator type or type of gas treatment method. Reaction kinetics that result in lead solubility reduction were shown to be proportional to carbon dioxide partial pressure and in many cases were limited by mass transfer to the residue. With forced gas convection through the residue and a CO2 partial pressure of 0.3%, the concentration of lead in leachate was reduced from 84 mg L-1 to < 0.5 mg L-1 in two days. Ettringite analogs (Ca6Al2(SO4)3 (OH)2.26H2O) were identified by X-Ray Diffraction in the wetted scrubber residues early in the aging process; these appear to have been converted into gypsum (CaSO4.2H2O) and vaterite (CaCO3) in the aged material. All of these solid phases are believed to substitute lead into their crystal structure and evidence for this attenuation mechanism is presented.

元の言語英語
ページ(範囲)90-98
ページ数9
ジャーナルWaste Management and Research
20
発行部数1
DOI
出版物ステータス出版済み - 1 1 2002
外部発表Yes

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All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Pollution

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