Sulfate-Reducing Bacteria in Anaerobic Propionate Systems
Publication: Journal of Environmental Engineering
Volume 123, Issue 7
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 decreased the extent of acetate utilization by SRB. The propionate utilizing SRB outcompeted the propionate utilizing acetogens in the chemostats. This was attributed to lower Monod-half velocity coefficient, Ks, for propionate utilization by SRB (4.5 mg-Pr/L), than the Ks for propionate utilization by acetogens (20.4 mg-Pr/L). The rate constants (k) for SRB and acetogens in terms of mg of propionate/mg of volatile suspended solids (VSS) per day were approximately 5.2 and 3.1 mg-Pr/mg-VSS-d, respectively. In sulfate-rich conditions, propionate was utilized by SRB, and the intermediate acetate was utilized by both SRB and methanogens.
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Published In
Journal of Environmental Engineering
Volume 123 • Issue 7 • July 1997
Pages: 675 - 682
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Jul 1, 1997
Published in print: Jul 1997
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