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Prevention of Lipid Inhibition in Anaerobic Processes by Introducing a Two-Phase System
Abstract
The inhibitory effect of lipids and prevention of this inhibition in a two-phase anaerobic process were examined using laboratory-scale reactors and batch experiments. Lipids were satisfactorily degraded in a two-phase anaerobic filter while in a single-phase system, inhibition resulted in poor lipid degradation. Unsaturated long-chain fatty acids (LFAs) had a greater inhibitory effect than saturated LFAs. Methane production as well as beta-oxidation (degradation of saturated LFAs) were inhibited by unsaturated LFAs. The saturation of unsaturated LFAs was not inhibited, and palmitate (C16:0) was accumulated in the degradation of oleate (C18:l) or linoleate (C18:2). Greater inhibition was observed at low pH values. Continuous operation of a suspended-growth acidogenic reactor showed that hydraulic retention times (HRTs) of no less than 8 hours were necessary to mitigate the inhibition in a two-phase process. The fact that saturation of oleate occurred at HRTs no less than 8 hours suggests that the saturation of unsaturated LFAs in an acidogenic reactor is essential in the prevention of lipid inhibition in two-phase anaerobic processes.
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Sodium oleate was used as a model for LCFA because it is generally the most abundant LCFA in wastewater, has good solubility, is the most important LCFA produced by whole milk degradation, and is one of the more toxic LCFA.
“Sodium oleate was used as a model for LCFA because it is, in general, the most abundant of all LCFA present in wastewater (Komatsu et al., 1991), has a good solubility, it is the most important LCFA produced by whole milk degradation (Hanaki et al., 1981) and is one of the more toxic LCFA (Galbraith et al., 1971).”
From Effects of lipids and oleic acid on biomass development in anaerobic fixed-bed reactors. Part II: Oleic acid toxicity and biodegradability (2001) · cites this paper as Komatsu et al., 1991
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An overview of various technologies for the treatment of dairy wastewaters
Kushwaha, J. P., Srivastava, V. C., & Mall, I. D. (2011) · Critical Reviews in Food Science and Nutrition · doi:10.1080/10408391003663879 · Cited by 290
Alves, M. M., Mota Vieira, J. A., Álvares Pereira, R. M., Pereira, M. A., & Mota, M. (2001) · Water Research · doi:10.1016/s0043-1354(00)00242-6 · Cited by 163
Metadata
- Authors
- Komatsu, T., Hanaki, K., & Matsuo, T.
- Venue
- Water Science and Technology
- Publisher
- IWA Publishing
- Published
- 1991-04-01
- Volume
- 23
- Issue
- 7-9
- Pages
- 1189-1200
- ISSN
- 0273-1223
- 1996-9732
- Cited by
- 51
- References
- 0
- Language
- en
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