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

Paper Titles

Removal of Arsenic from Aqueous Solution by Aeromonas hydrophila
p.647

In Situ Bioremediation of Tailings by Sulfate Reducing Bacteria and Iron Reducing Bacteria: Lab- and Field-Scale Remediation of Sulfidic Mine Tailings
p.651

Immobilization of Arsenic by a Thermoacidophilic Mixed Culture with Pyrite as Energy Source
p.656

Genomic Characterization of the Arsenic-Tolerant Actinobacterium, Rhodococcus erythropolis S43
p.660

Microbiological As(III) Oxidation and Immobilization as Scorodite at Moderate Temperatures
p.664

Investigating the Bioleaching of an Arsenic Mine Tailing Using a Mixed Mesophilic Culture
p.668

Manganese Removal from Metal Refinery Wastewater Using Mn(II)-Oxidizing Bacteria
p.673

Microbially Catalysed Selenate Removal in an Inverse Fluidised Bed Reactor
p.677

Evaluation of Substrate Consumption Kinetics in Different Support Materials for Biotrickling Filters Aiming Biogas Desulfurization
p.682

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Microbiological As(III) Oxidation and Immobilization as Scorodite at Moderate Temperatures

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 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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Solid State Phenomena (Volume 262)

Pages:

664-667

DOI:

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

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Online since:

August 2017

Authors:

Yuta Era, Tsuyoshi Hirajima, Keiko Sasaki, Naoko Okibe*

Keywords:

Acid Mine Drainage (AMD), Arsenic, As(III)-Oxidizing Bacteria, Copper Refinery Wastewater, Fe(II)-Oxidizing Bacteria, Scorodite

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