1994 journal article
LOW-TEMPERATURE DIGESTION OF DAIRY AND SWINE MANURE
BIORESOURCE TECHNOLOGY, 47(2), 165–171.

Laboratory anaerobic digesters were fed dairy and swine manure at the rates of 0.1 and 0.2 kg volatile solids (VS)/ m3-day over the temperature range of 10–23°C. The digesters were operated successfully with little indication of instability. Methane (CH4) yield, (B, m3 CH4/kg VS added) was determined to typically decrease linearly as temperature (T, °C) was decreased: Dairy at 0.1 kg VS/m3-day B=0.1153+0.0053TDairy at 0.2 kg VS/m3-day B=0.0820+0.0063TSwine at 0.1 kg VS/m3-day B=0.2011+0.0053TSwine at 0.2 kg VS/m3-day B=0.3177+0.0044T Some increased performance was suggested for the lower loading rates compared with higher loading rates.