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Anaerobic digestion at extreme ammonia concentrations
AbstractThe anaerobic digestion of potato juice, used as a model complex wastewater, was investigated at extreme ammonia concentrations. Even at 11·8 g ammonia-N/litre methanogenesis occurred, but at 16 g ammonia-N/litre methanogenic activity had become nil. The adaptation potential of the granular sludge used in this study was 6·2, which means that after the adaptation process in which the sludge gained the ability to produce methane at ammonia concentrations exceeding the initial toxicity threshold level, the maximum tolerable ammonia concentration was 6·2 times higher than the initial toxicity threshold level.After more than three weeks of exposure to 9·1 g ammonia-N/litre the maximum specific methanogenic activity of granular sludge at 5·2 g ammonia-N/litre was found to fit well in the general relationship between ammonia concentration and methanogenic activity established in the present research. This indicates that even at extremely high concentrations ammonia toxicity is reversible to a great extent.It was also found that contrary to methanogenesis, the production of volatile fatty acids from the complex substrate was hardly affected by high ammonia concentrations.
Anaerobic digestion at extreme ammonia concentrations
AbstractThe anaerobic digestion of potato juice, used as a model complex wastewater, was investigated at extreme ammonia concentrations. Even at 11·8 g ammonia-N/litre methanogenesis occurred, but at 16 g ammonia-N/litre methanogenic activity had become nil. The adaptation potential of the granular sludge used in this study was 6·2, which means that after the adaptation process in which the sludge gained the ability to produce methane at ammonia concentrations exceeding the initial toxicity threshold level, the maximum tolerable ammonia concentration was 6·2 times higher than the initial toxicity threshold level.After more than three weeks of exposure to 9·1 g ammonia-N/litre the maximum specific methanogenic activity of granular sludge at 5·2 g ammonia-N/litre was found to fit well in the general relationship between ammonia concentration and methanogenic activity established in the present research. This indicates that even at extremely high concentrations ammonia toxicity is reversible to a great extent.It was also found that contrary to methanogenesis, the production of volatile fatty acids from the complex substrate was hardly affected by high ammonia concentrations.
Anaerobic digestion at extreme ammonia concentrations
Koster, I.W. (author) / Lettinga, G. (author)
Biological Wastes ; 25 ; 51-59
1987-12-17
9 pages
Article (Journal)
Electronic Resource
English
Anaerobic digestion of dairy manure with enhanced ammonia removal
| Online Contents | 2008
| Wiley | 2019