Abstract
One- and two-phase laboratory scale anaerobic digestion systems were studied using screened dairy manure as feed material. Using completely mixed reactors, the acid-phase digestions were operated at HRT of 1·3 and 1·5 days. Both completely-mixed and fixed-film reactors were used in the methane-phase digestion. The separation of acidogenic and methanogenic phases of digestion resulted in a significant increase in methane production rate in the methane reactors. At 1 day HRT, the maximum methane production rates of 2·32 and 1·50 litres of CH 4 per litre per day were obtained for a fixed-film methane-phase reactor and a one-phase fixed-film reactor, respectively. In terms of overall systems performance the two-phase systems were not superior to the one-phase systems.
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