Arsenic Immobilization by Biological Scorodite Crystallization: Effect of High Ferric Concentration and Foreign Seeds

Paula González Contreras; Jan Weijma; Cees N.J. Buisman

doi:10.4028/www.scientific.net/AMR.71-73.629

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 71-73Arsenic Immobilization by Biological Scorodite...

Arsenic Immobilization by Biological Scorodite Crystallization: Effect of High Ferric Concentration and Foreign Seeds

Abstract:

Biological scorodite is produced at 80°C and 1g L-1 As5+, using iron oxidizing bacteria Acidianus Sulfidivorans, with a molar ratio Fe/As of 1 and without the use of seeds. We investigated the effect of high ferrous concentration, Fe/As higher than 1, and the use of foreign seeds (gypsum) on biological scorodite crystallization. The use of high ferrous concentrations resulted in a retardation of the time of crystallization due to the high concentration of ferric produced by a high biological oxidation. However, ferrous biological oxidation might be controlled to avoid this effect. The use of seeds did not improve the kinetics of crystallization. Nonetheless, a high arsenic removal rate was observed in the presence of seeds probably as a result of the formation of less stable scorodite.

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Periodical:

Advanced Materials Research (Volumes 71-73)

Pages:

629-632

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.71-73.629

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Online since:

May 2009

Authors:

Paula González Contreras, Jan Weijma, Cees N.J. Buisman

Keywords:

Acidianus sulfidivorans, Arsenic (V), Biological Scorodite, Crystallization, Ferrous Oxidation, Gypsum Seed

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