Abstract
One-phase and two-phase anaerobic digestion systems were studied using screened dairy manure as feed material. Loading rates for the one-phase fixed-film reactor ranged from 13·2 to 32·8 g VS litre −1 day −1, with hydraulic retention times (HRTs) of 2·5 and 1 days. When the acidogenic (completely mixed) and the methanogenic (fixed-film) reactors were used in a two-phase system, the first phase was operated at 1·5 days HRT and a loading rate of 22·2 g VS litre −1 day −1, while the HRT for the second phase was 1 day, with a loading rate of 33·0 g VS litre −1 day −1. With acidogenesis pretreatment, a maximum production rate of 2·04 litres CH 4 litre −1 day −1 was achieved at 1 day HRT during the methanogenic-phase digestion, whereas 1·50 litres CH 4 litre −1 day −1 was obtained under the same conditions using the one-phase digestion. Reactor performance was greatly improved when acidogenic and methanogenic phases could be controlled and operated independently. The acidogenic phase resulted in a higher methane production rate and methane yield from the subsequent methanogenic phase.
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