Microbiological as(III) oxidation and immobilization as scorodite at moderate temperatures

Yuta Era, Tsuyoshi Hirajima, Keiko Sasaki, Naoko Okibe

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

1 被引用数 (Scopus)

抄録

The potential utility of mesophilic/moderately thermophilic acidophiles was investigated for immobilization of arsenic (As) as scorodite (FeAsO4·2H2O) at moderate temperatures (35–45˚C). Here, the acid-tolerant mesophile Thiomonas cuprina Hö5 and acidophilic moderately thermophile Acidimicrobium ferrooxidans ICP were selected as As(III)- and Fe(II)- oxidizers, respectively. Due to a difference in their optimal growth pHs, a 2-step reaction consisting of the 1st As(III) oxidation step followed by the Fe(II) oxidation + precipitation step was studied. In our previous study, the optimal [Fe(II)]ini/[As(III)]ini molar ratio for bioscorodite formation at 70˚C (at [As(III)]ini = 1000 ppm) was shown to be around 1.4. However, setting the same molar ratio at moderate temperatures (35-45˚C) resulted in formation of unstable amorphous ferric arsenate. Lowering the ratio to ≤ 1.0 led to precipitation of crystalline bioscorodite with > 90% As(III) removal at 45˚C.

本文言語英語
ホスト出版物のタイトル22nd International Biohydrometallurgy Symposium
編集者Sabrina Hedrich, Axel Schippers, Kathrin Rubberdt, Franz Glombitza, Wolfgang Sand, Wolfgang Sand, Mario Vera Veliz, Sabine Willscher
出版社Trans Tech Publications Ltd
ページ664-667
ページ数4
ISBN(印刷版)9783035711806
DOI
出版ステータス出版済み - 2017
イベント22nd International Biohydrometallurgy Symposium, 2017 - Freiberg, ドイツ
継続期間: 9 24 20179 27 2017

出版物シリーズ

名前Solid State Phenomena
262 SSP
ISSN(印刷版)1012-0394
ISSN(電子版)1662-9779

その他

その他22nd International Biohydrometallurgy Symposium, 2017
Countryドイツ
CityFreiberg
Period9/24/179/27/17

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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