Hexavalent chromium reduction by immobilized cells of Bacillus sphaericus AND 303
Braz. arch. biol. technol
; Braz. arch. biol. technol;56(3): 505-512, May-June 2013. ilus, tab
Article
em En
| LILACS
| ID: lil-679198
Biblioteca responsável:
BR1.1
ABSTRACT
Bacillus sphaericus AND 303, a Cr(VI)-resistant and reducing bacterium reported from serpentine outcrops of Andaman was evaluated for Cr(VI) reduction using immobilized cells under batch culture. Screening of inert matrices for entrapment of whole cells indicated that polyvinyl alchohol-alginate was the most effective one reducing 87.5% of 20 µM Cr(VI) in 24 h. The rate of chromate reduction was dependent on initial Cr(VI) and biomass concentrations. The PVA cell beads were recycled three times without cell leakage and disintegration. The reduction efficiency was improved in the presence of glucose and glycerol as electron donors leading to complete reduction. However, the presence of additional metal ions was inhibitory to Cr(VI) reduction. It could be emphasized that PVA-alginate immobilized cells of B. sphaericus AND 303 could be used as a continuous bioprocess in treating Cr(VI) contaminated effluents.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Idioma:
En
Revista:
Braz. arch. biol. technol
Assunto da revista:
BIOLOGIA
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Índia
País de publicação:
Brasil