Abstract
Acid mine drainage (AMD) is a major environmental challenge for the mining industry in northern climates. Laboratory-scale experiments were conducted to test various simple and complex carbon sources available in the Yukon as electron donors for sulfate reduction to allow the subsequent removal of Cd and Zn from a Yukon AMD. The 1 L capacity bioreactors were monitored biweekly at 5 °C. After 162 days, a diminution of both total organic carbon and sulfate concentrations was observed in all bioreactors. A long adaptation period was necessary before consumption of the carbon source started, which might be due to the cold temperature. Simple organic sources of carbon (methanol and ethylene glycol) and complex organic sources of carbon (potato oil, brewery residue, peat, and straw) were used to support SRB growth. Methanol and ethylene glycol led to a diminution of sulfate concentrations of 71.2 and 36.9%, respectively, while the decrease of sulfate concentrations was limited to 13.8 and 5.3% when using peat and straw, respectively.
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