Abstract
Acid mine drainage represents a major cause of environmental impact associated with the activity of mineral extractive industries. In this study, we evaluated the treatment of this wastewater through an anaerobic sequencing batch reactor at 15, 30, and 55 °C with a sludge of sulfidogenic and methanogenic origin. The operation at 30 °C with sulfidogenic sludge showed the highest average removal of sulfate (80 %), while the highest average removal of COD (92 %) occurred at 30 °C with methanogenic sludge. The sulfidogenic phases showed lower apparent kinetic constants (Kap), compared at the same temperature, with the methanogenic phases, according to the first-order kinetic adjustment, considering residual concentration. The sulfate-reducing bacteria reproduced at 15 °C, according to growth enumeration by the most probable number method, which demonstrates its contribution to the growth of communities present in the inoculum due to the environmental conditions.
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