Behavior of Volatile Sulfur Compounds in Mesophilic Anaerobic Digestion
Three types of batch tests were conducted in support of modeling the conversion and fate of sulfur-containing compounds in mesophilic anaerobic digestion. Degradation of volatile organic sulfur compounds (VOSCs) mediated by methanogens was confirmed by raw sludge incubations with and without methanogen-inhibitor. VOSCs degradation rates were estimated in the VOSCs dosed tests. In these tests it was found that acetate, added as a potentially competing carbon source with the VOSCs, had no effect on VOSC degradation. VOSCs formation rates were estimated in the incubation of methionine with methanogen-inhibition. Through the collective analysis of the batch test results, the conversion processes of VSCs during anaerobic digestion have been framed. The process kinetics were identified and rate constants were calibrated. Furthermore, the relationship between the release of ammonia-N and VSC-S was explored. Releases of ammonia-N and VSC-S were simultaneous in the digestion of methionine but not in the digestion of raw sludge.
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Document Type: Research Article
Publication date: 2009-01-01
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