Elution characteristics of undesirable anionic species from fly ash blended cement in different aqueous solutions

Keiko Sasaki, Shingo Nakama, Quanzhi Tian, Binglin Guo, Mengmeng Wang, Ryoichi Takagi, Tomohiko Takahashi

研究成果: Contribution to journalArticle査読

抄録

There are few reports to explore immobilization of undesirable anionic species released from fly ash (FA) blended cement. This study clarifies the stabilities of several undesirable anionic species, through dissolution tests under a different matrix. The immobilization mechanism mainly involves co-precipitation with ettringite and hydrocalumite, the marginal formation of insoluble Ca salts, and occlusion in calcium silicate hydrates and amorphous phases produced during the pozzolanic reaction. The products released some amounts of chromate, arsenate, and selenite but not borate in dissolution tests. Elution of borate was the most effectively immobilized by Ca additives, owing to selective incorporation in ettringite. Moreover, selenite showed a trend of dissolving in acidic conditions, presumably owing to the dissolution of CaSeO3 with relatively high Ksp in addition to coprecipitation with hydrocalumite and ettringite. Under the present mixing condition of cementation, only selenite is a cautionary species which excessively eluted over the environmental standard.

本文言語英語
論文番号105171
ジャーナルJournal of Environmental Chemical Engineering
9
3
DOI
出版ステータス出版済み - 6 2021

All Science Journal Classification (ASJC) codes

  • 化学工学(その他)
  • 廃棄物管理と処理
  • 汚染
  • プロセス化学およびプロセス工学

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