Résumé : |
The effect of trivalent chromium an anaerobic digestion was investigated using a synthetic waste containing glucose as the organic carbon source. It was found that an influent concentration of 5000mg/l trivalent chromium could be tolerated by acclimatized methanogenic bacteria. However,if the concentration in the synthetic waste was further increased, inhibition of the methanogens resulted, with a corresponding decrease in degester performance. These results suggest,therefore, that the concentration of trivalent chromium present in tannery effluents and sludges,which ranges from 1 to 2500 mg/l would have no significant effect on an acclimatized, stable anaerobic digester treating these wastes. |