Arsenite oxidation in batch reactors with alginate-immobilized ULPAs1 strain.

Autor: Simeonova DD; Laboratoire de Dynamique, Evolution et Expression de Génomes de Microorganismes, FRE 2326 Université Louis Pasteur-CNRS, 28 rue Goethe, 67083 Strasbourg Cédex, France., Micheva K, Muller DA, Lagarde F, Lett MC, Groudeva VI, Lièvremont D
Jazyk: angličtina
Zdroj: Biotechnology and bioengineering [Biotechnol Bioeng] 2005 Aug 20; Vol. 91 (4), pp. 441-6.
DOI: 10.1002/bit.20530
Abstrakt: 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.
(Copyright 2005 Wiley Periodicals, Inc.)
Databáze: MEDLINE
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