Removal of chromium (VI) and cadmium (II) from aqueous solution by a bacterial ...

• Autor(es): Quintelas, C. ; Tavares, M. T.
• Data: 2001
• Identificador Persistente: http://hdl.handle.net/1822/1483
• Origem: RepositóriUM - Universidade do Minho
• Assunto(s): Activated carbon; Arthrobacter viscosus; Biofilm; Biosorption; Heavy metals
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

A biofilm of Arthrobacter viscosus, supported on granular activated carbon, removed between 100% and 50% of Cr(VI) and between 100% and 20% of Cd(II) from solutions with initial concentrations between 4–11 mgmetal Lˉ¹ and a flow residence time of 1.2 min. For experiments of lower initial concentrations, a steady-state removal of 50% was reached after 71 bed volumes of Cr solution passed through the biosorbent bed and a steady-state removal of 30% was reached after 47 bed volumes of Cd solution passed through a similar bed. Final uptakes of 8.5 mgCr gˉ¹ carbon and 4.2 mgCd gˉ¹ carbon were determined for initial concentrations of 10 mgCr Lˉ¹ and 11 mgCd Lˉ¹, respectively. The influence on the overall process of two different surface treatments of the support was evaluated and compared with the behavior of a support not treated.