Abstract
The design of anaerobic treatment systems for sulfate containing high-strength wastewater requires the understanding of interactions between sulfate reducers and other anaerobes. The objectives of this research were to study the effects of the feed propionate:sulfate ratio on the interactions among the sulfate-reducing bacteria (SRB), acetogens, and methanogens, and to determine the kinetics of anaerobic biological reactions for propionate degradation under sulfate-limited and sulfate-rich conditions. Both continuous and batch experiments were conducted to meet these objectives. In sulfate-limited chemostats with propionate as the sole carbon source, the effluent sulfate concentration was governed by the propionate utilizing SRB and was below 10 mg/L. In sulfate-rich systems the effluent sulfate concentration was governed by acetate utilizing SRB and could not be maintained below 400 mg/L without controlling the sulfide concentration. Under these sulfate-rich conditions, a decrease in SRT from 30 to 13 d ...
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