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|Title: ||Oxygen Effects in Anaerobic Digestion II|
|Authors: ||Botheju, Deshai|
|Issue Date: ||2010 |
|Abstract: ||Standard models describing bio-gasification using anaerobic digestion do not include necessary processes
to describe digester dynamics under the conditions of oxygen presence. Limited oxygenation in anaerobic
digestion can sometimes be beneficial. The oxygen effects included anaerobic digestion model, ADM 1-
Ox, was simulated against experimental data obtained from laboratory scale anaerobic digesters operated
under different oxygenation conditions. ADM 1-Ox predictions are generally in good agreement with the
trends of the experimental data.
ADM 1-Ox simulations suggest the existence of an optimum oxygenation level corresponding to a peak
methane yield. The positive impact of oxygenation on methane yield is more pronounced at conditions
characterized by low hydrolysis rate coeffi cients (slowly degradable feed) and low biomass concentrations.
The optimum oxygenation point moves towards zero when the hydrolysis rate coefficient and the biomass
concentration increase. Accordingly, the impact of oxygenation on methane yield can either be positive or
negative depending on the digestion system characteristics. The developed ADM 1-Ox model can therefore
be a valuable tool for recognizing suitable operating conditions for achieving the maximum benefits from
partial aeration in anaerobic digestion.|
|Keywords: ||anaerobic digestion|
|Document type: ||Journal article|
|Appears in Collections:||Institutt for prosess-, energi- og miljøteknologi|
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