Safley and westerman (1988) and safley and westerman(1992) reviewed design data for normel and low- temperature anaerobic digestion of animal manures. A stuby of the use of covered anaerobic lagons for treating animal manure in the US has suggested that these lahgoons require high BOD loadings to generate economic quantities of biogas. Safley and westesrman (1988) reported that biogas production on lightly loaded (kg VS/m) anae-robic ponds generated only low quantities of biogas (up to 0.5 m/m.day or o.23 m/m.day). Gas pro duction is highly densitive to pond temperature (safley&westerman,1993), although methanoge nesis occurs at temperatures as low as 4•C ( stevens & schulte, 1979). The higher temperature of slaugh terhouse wasteweter should eliminate this problem.