Batch and Continuous Packed Column Studies Biosorption by Yeast Supported onto Granular Pozzolana

The removal of chromium by living yeast biomass immobilized onto pozzolana was studied. The results obtained in batch experiments indicate that the immobilized yeast on to pozzolana is a excellent biosorbent of Cr(V) with a good removal rates of 85–90%. The initial concentration solution and agitation speed affected Cr(V) removal. The batch studies data were described using the Freundlich and Langmuir models, but the best fit was obtained with Langmuir model. The breakthrough curve from the continuous flow studies shows that immobilized yeast in the fixedbed column is capable of decreasing Cr(VI) concentration from 15mg/l to a adequate level. Keywords—Biosorption, yeast, chromium, kinetic biosorption, fixed biomass.