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

Yuta Era; Tsuyoshi Hirajima; Keiko Sasaki; Naoko Okibe

doi:10.4028/www.scientific.net/SSP.262.664

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

Yuta Era, Tsuyoshi Hirajima, Keiko Sasaki, Naoko Okibe

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Citations (Scopus)

Abstract

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.

Original language	English
Title of host publication	22nd International Biohydrometallurgy Symposium
Editors	Sabrina Hedrich, Axel Schippers, Kathrin Rubberdt, Franz Glombitza, Wolfgang Sand, Wolfgang Sand, Mario Vera Veliz, Sabine Willscher
Publisher	Trans Tech Publications Ltd
Pages	664-667
Number of pages	4
ISBN (Print)	9783035711806
DOIs	https://doi.org/10.4028/www.scientific.net/SSP.262.664
Publication status	Published - 2017
Event	22nd International Biohydrometallurgy Symposium, 2017 - Freiberg, Germany Duration: Sept 24 2017 → Sept 27 2017

Publication series

Name	Solid State Phenomena
Volume	262 SSP
ISSN (Print)	1012-0394
ISSN (Electronic)	1662-9779

Other

Other	22nd International Biohydrometallurgy Symposium, 2017
Country/Territory	Germany
City	Freiberg
Period	9/24/17 → 9/27/17

All Science Journal Classification (ASJC) codes

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

Access to Document

10.4028/www.scientific.net/SSP.262.664

Cite this

Era, Y., Hirajima, T., Sasaki, K., & Okibe, N. (2017). Microbiological as(III) oxidation and immobilization as scorodite at moderate temperatures. In S. Hedrich, A. Schippers, K. Rubberdt, F. Glombitza, W. Sand, W. Sand, M. V. Veliz, & S. Willscher (Eds.), 22nd International Biohydrometallurgy Symposium (pp. 664-667). (Solid State Phenomena; Vol. 262 SSP). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/SSP.262.664

Microbiological as(III) oxidation and immobilization as scorodite at moderate temperatures. / Era, Yuta; Hirajima, Tsuyoshi; Sasaki, Keiko et al.
22nd International Biohydrometallurgy Symposium. ed. / Sabrina Hedrich; Axel Schippers; Kathrin Rubberdt; Franz Glombitza; Wolfgang Sand; Wolfgang Sand; Mario Vera Veliz; Sabine Willscher. Trans Tech Publications Ltd, 2017. p. 664-667 (Solid State Phenomena; Vol. 262 SSP).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Era, Y, Hirajima, T, Sasaki, K & Okibe, N 2017, Microbiological as(III) oxidation and immobilization as scorodite at moderate temperatures. in S Hedrich, A Schippers, K Rubberdt, F Glombitza, W Sand, W Sand, MV Veliz & S Willscher (eds), 22nd International Biohydrometallurgy Symposium. Solid State Phenomena, vol. 262 SSP, Trans Tech Publications Ltd, pp. 664-667, 22nd International Biohydrometallurgy Symposium, 2017, Freiberg, Germany, 9/24/17. https://doi.org/10.4028/www.scientific.net/SSP.262.664

Era Y, Hirajima T, Sasaki K , Okibe N. Microbiological as(III) oxidation and immobilization as scorodite at moderate temperatures. In Hedrich S, Schippers A, Rubberdt K, Glombitza F, Sand W, Sand W, Veliz MV, Willscher S, editors, 22nd International Biohydrometallurgy Symposium. Trans Tech Publications Ltd. 2017. p. 664-667. (Solid State Phenomena). doi: 10.4028/www.scientific.net/SSP.262.664

Era, Yuta ; Hirajima, Tsuyoshi ; Sasaki, Keiko et al. / Microbiological as(III) oxidation and immobilization as scorodite at moderate temperatures. 22nd International Biohydrometallurgy Symposium. editor / Sabrina Hedrich ; Axel Schippers ; Kathrin Rubberdt ; Franz Glombitza ; Wolfgang Sand ; Wolfgang Sand ; Mario Vera Veliz ; Sabine Willscher. Trans Tech Publications Ltd, 2017. pp. 664-667 (Solid State Phenomena).

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abstract = "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 H{\"o}5 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.",

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ER -

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

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