Abstract
Psychrophilic (12°C) anaerobic digestion in a laboratory scale (4 l) fixed-film reactor fed with screened dairy manure was successfully attained from a mesophilic fixed-film reactor. Within an operational period of 2 1 2 month, methane production rate of 0.27 l CH 4 l −1 day −1 obtained at 1 day hydraulic retention time. The highest methane production rate was 0.30 l CH 4 l −1 day −1 at a loading rate of 28.7 g VS l −1 day −1 at 1 day hydraulic retention time. This study indicates that fixed-film reactor can handle a sudden change of temperature without stopping gas production, and also a high loading rate and short hydraulic retention time with no signs of process instability.
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