Journal article
Methane conversion efficiency as a simple control parameter for an anaerobic digester at high loading rates
Water Science & Technology, Vol.64(2), pp.534-539
2011
Abstract
The anaerobic digestion process is globally applied to the treatment of highly concentrated wastes such as industrial and rural effluents, and sewage sludge. However, it is known to be relatively unstable. When loaded with high concentrations of organic material, unwanted volatile fatty acids (VFA) are often produced rather than methane (CH(4)) gas which can lead to digester acidification and failure. This study investigated digester behaviour under high loading rates, testing the usefulness of stoichiometric methane conversion efficiency as a digester control parameter at high loading rates. Our results show that, in general, the CH(4) production rate was proportional to the feed rate (loading rate). However, at very high loading rates, the CH(4) production rate was not proportional to the increase in the feeding rate. Consequently, VFA accumulated and the H(2) partial pressure increased. The proportionality of the loading rate and gas production rate is stoichiometrically expressed as the conversion efficiency. We found that conversion efficiency was a useful indicator as an early warning of digester imbalance. The digester remained stable at conversion efficiencies above 75%. Dropping below 70% signified the onset of digester failure. As loading rate and methane production data are readily available on-line in most anaerobic digestion plants, the conversion efficiency can be monitored on-line and used as an efficient control technique to maintain safe operation of anaerobic digesters at high loading rates.
Details
- Title
- Methane conversion efficiency as a simple control parameter for an anaerobic digester at high loading rates
- Authors/Creators
- W. Charles (Author/Creator)N.P. Carnaje (Author/Creator)R. Cord-Ruwisch (Author/Creator)
- Publication Details
- Water Science & Technology, Vol.64(2), pp.534-539
- Publisher
- International Water Association Publishing
- Identifiers
- 991005542348607891
- Copyright
- © IWA Publishing 2011
- Murdoch Affiliation
- Centre for Organic Waste Management; School of Biological Sciences and Biotechnology
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.83 Bioengineering
- 3.83.416 Anaerobic Digestion
- Web Of Science research areas
- Engineering, Environmental
- Environmental Sciences
- Water Resources
- ESI research areas
- Environment/Ecology