Arsenite oxidation in batch reactors with alginate-immobilized ULPAs1 strain.
Biotechnol Bioeng, 2005/8/20;91(4):441-6.
Simeonova DD[1], Micheva K, Muller DA, Lagarde F, Lett MC, Groudeva VI, Lièvremont D
Affiliations
PMID: 15981279
Impact factor: 4.395
Abstract
Arsenic is one of the major groundwater contaminants worldwide. It was previously demonstrated that the beta-proteobacterium Cenibacterium arsenoxidans has an efficient As[III] oxidation ability. The present study was conducted to evaluate the performance of alginate-immobilized ULPAs1 in the oxidation of As[III] to As[V] in batch reactors. A two-level full factorial experimental design was applied to investigate the influence of main parameters involved in the oxidation process, i.e., pH (7-8), temperature (4 degrees C-25 degrees C), kind of nutrient media (2%-20% sauerkraut brine), and arsenic concentration (10-100 mg/L). One hundred milligram per liter of As[III] was fully oxidized by calcium-alginate immobilized cells in 1 h. It was found that the temperature as well as the kind of nutrient media used were significant parameters at a 95% confidence interval whereas only temperature was a significant parameter at a 99% confidence interval. The immobilization of the As[III] oxidizing strain in alginate beads offers a promising way to implement new treatment processes in the remediation of arsenic contaminated waters.
MeSH terms
Alginates; Arsenic; Betaproteobacteria; Bioreactors; Cells, Immobilized; Culture Media; Fresh Water; Oxidation-Reduction; Water Microbiology; Water Pollutants, Chemical
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