| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 212539 | Hydrometallurgy | 2012 | 6 Pages |
Polyphasic optimisation process for ferric iron mediated metal extraction with 50 mL system on COD digester showed 60% copper and 56% zinc extractions in only 30 and 90 min of contact time respectively. Optimum conditions were 90 °C reaction temperature, 10% (w/v) pulp density, pH 1.8 and 1.5% (w/v) Fe3+ concentration. The system was scaled up successfully to 5000 mL and as high as 80.81% copper and 54.0% zinc extractions were obtained in 30 and 90 min respectively without addition of any catalyst. The bioregeneration of Fe3+ iron from the leachate in shake flask study by developed iron oxidising consortium showed IOR of 396 mg/L/h in the presence of as high as 124.8, 21.0, 2.8 and 26.7 g/L total dissolved solids, total iron, copper and zinc respectively. The developed biofilm in down-flow packed bed column having UHMWPE plastic material as support matrix showed 3100 mg/L/h IOR, which is eight fold higher as compared to the best IOR obtained in shake flask study.
►Optimised parameters for Cu and Zn leaching from PBC are similar except reaction time. ►The leaching process for PBC successfully scaled up from 50 mL to 5000 mL. ►As high as 80.81% Cu and 54.00% Zn extractions were achieved in 5000 mL system. ►Consortium efficiently oxidise Fe2+ iron under acid and metal stress from leachate. ►Compare to flask packed bed column found 8 fold efficient for Fe3+ regeneration.
