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 proceedingConference contribution

2 Citations (Scopus)


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 languageEnglish
Title of host publication22nd International Biohydrometallurgy Symposium
EditorsSabrina Hedrich, Axel Schippers, Kathrin Rubberdt, Franz Glombitza, Wolfgang Sand, Wolfgang Sand, Mario Vera Veliz, Sabine Willscher
PublisherTrans Tech Publications Ltd
Number of pages4
ISBN (Print)9783035711806
Publication statusPublished - 2017
Event22nd International Biohydrometallurgy Symposium, 2017 - Freiberg, Germany
Duration: Sept 24 2017Sept 27 2017

Publication series

NameSolid State Phenomena
Volume262 SSP
ISSN (Print)1012-0394
ISSN (Electronic)1662-9779


Other22nd International Biohydrometallurgy Symposium, 2017

All Science Journal Classification (ASJC) codes

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


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