Abstract
Biological scorodite is produced at 80°C and 1g L-1 As5+, using iron oxidizing bacteria Acidianus Sulfidivorans, with a molar ratio Fe/As of 1 and without the use of seeds. We investigated the effect of high ferrous concentration, Fe/As higher than 1, and the use of foreign seeds (gypsum) on biological scorodite crystallization. The use of high ferrous concentrations resulted in a retardation of the time of crystallization due to the high concentration of ferric produced by a high biological oxidation. However, ferrous biological oxidation might be controlled to avoid this effect. The use of seeds did not improve the kinetics of crystallization. Nonetheless, a high arsenic removal rate was observed in the presence of seeds probably as a result of the formation of less stable scorodite.
| Original language | English |
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| Title of host publication | Proceedings of the 18th International Biohydrometallurgy Symposium, Bariloche, Argentina, 13-17 september 2009 |
| Place of Publication | Switzerland |
| Publisher | Trans Tech Publications |
| Pages | 629-632 |
| Volume | 71-73 |
| ISBN (Print) | 9780878493227 |
| DOIs | |
| Publication status | Published - 2009 |
| Event | 18th International Biohydrometallurgy Symposium, Bariloche, Argentina - Duration: 13 Sept 2009 → 17 Sept 2009 |
Conference
| Conference | 18th International Biohydrometallurgy Symposium, Bariloche, Argentina |
|---|---|
| Period | 13/09/09 → 17/09/09 |
Keywords
- Acidianus sulfidivorans
- Arsenic (V)
- Biological scorodite
- Crystallization
- Ferrous oxidation
- Gypsum seeds