By Marios Tsezos, Artin Hatzikioseyian, Emmanouela Remoundaki (eds.)
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Extra resources for Proceedings of the International Biohydrometallurgy Symposium IBS 2003, Athens, Greece - Vol II
The trends observed are in good agreement with those reported earlier [18-20]. 766 Biosorption Figure 9a. Effect of biomass loading on Figure 9b. Effect of biomass Cr (VI) uptake loading on bioremoval of Cr (VI) The contributions of the bioreduction and biosorption components to the bioremoval process have also been determined and these results are depicted in Figure 9b. The experimental conditions are the same as those pertaining to Figure 9a. The percentage bioreduction is found to increase with increase in the biomass loading.
2 Effect of pH The cells obtained by centrifuging were washed and later dispersed in solutions of 2 ppm Cr (VI) or Cr (III). 5 to 7 in the case of Cr (VI) and pH 2-6 for Cr (III). The time of equilibration was fixed at 48 h for Cr (VI) and 24 h for Cr (III), and the final pH values were noted. The percentage bioremoval of Cr (VI) as a function of pH is depicted in Figure 8. 5 to 2 and thereafter continuously decreases with increase of pH. The maximum bioremoval of about 75% is observed at pH 2, while at pH 7 it is significantly reduced to 15%.
2002). pH-related equilibria models for biosorption in single metal systems. Chemical Engineering Science, vol 57, pp 307313. 7. Himmelblau, D. M. (1978). Process Analysis by Statistical Methods, John Wiley & Sons, New York. 8. C. (1991). Design and analysis of experiments, Third Edition. John Wiley & Sons. 9. , Veglio’. F. Metal speciation and pH effect on Pb, Cu, Zn and Cd biosorption onto Sphaerotilus natans. Water Research, in press 10. , van der Wal, A. (1995). pH dependent charging behaviour of isolated cell walls of a Gram-positive soil bacterium.
Proceedings of the International Biohydrometallurgy Symposium IBS 2003, Athens, Greece - Vol II by Marios Tsezos, Artin Hatzikioseyian, Emmanouela Remoundaki (eds.)