TY - GEN
T1 - Microbiological as(III) oxidation and immobilization as scorodite at moderate temperatures
AU - Era, Yuta
AU - Hirajima, Tsuyoshi
AU - Sasaki, Keiko
AU - Okibe, Naoko
N1 - Publisher Copyright:
© 2017 Trans Tech Publications, Switzerland.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
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U2 - 10.4028/www.scientific.net/SSP.262.664
DO - 10.4028/www.scientific.net/SSP.262.664
M3 - Conference contribution
AN - SCOPUS:85028970409
SN - 9783035711806
T3 - Solid State Phenomena
SP - 664
EP - 667
BT - 22nd International Biohydrometallurgy Symposium
A2 - Hedrich, Sabrina
A2 - Schippers, Axel
A2 - Rubberdt, Kathrin
A2 - Glombitza, Franz
A2 - Sand, Wolfgang
A2 - Sand, Wolfgang
A2 - Veliz, Mario Vera
A2 - Willscher, Sabine
PB - Trans Tech Publications Ltd
T2 - 22nd International Biohydrometallurgy Symposium, 2017
Y2 - 24 September 2017 through 27 September 2017
ER -