CINDEFI   05381
CENTRO DE INVESTIGACION Y DESARROLLO EN FERMENTACIONES INDUSTRIALES
Unidad Ejecutora - UE
artículos
Título:
Ferrous iron oxidation by Acidithiobacillus ferrooxidans immobilised on refractory clay tiles
Autor/es:
DONATI E:
Revista:
The Open Biotechnology Journal
Referencias:
Año: 2008 vol. " p. 197 - 201
Resumen:
Abstract: Refractory clay tiles are composed of kaolin, which is the
commercial name of clay, and this consists mainly of kaolinite mineral.
Two such tiles and caowool packed in glass columns were used for the
immobilization of Acidithiobacillus ferrooxidans cells in a ferrous iron
medium, which was percolated through the supports. Colonization was carried out
by several media replacements with no further inoculation until maximum ferric
iron productivity was reached. One of the tiles was discarded due to the high
iron precipitation during bacterial growth. The columns with the other supports
were used for ferrous iron oxidation in batch and continuous flow modes of
operation and these appeared to be promising supports for A. ferrooxidans. A ferrous iron oxidation rate of 14.5 mmol.l1.h1
was reached in one of the columns in the continuous culture. After being used
for several cultures, pieces of tiles with immobilized cells were stored at 4 ºC. Samples at different times
were incubated in ferrous medium and these showed high cell activity even after
6 months.