The gas production results are shown in Figs. 5 and 6. Gas production
was measured using a simple pneumatic trough and
amounts of CO2 produced calculated using Eq. (1) assuming nearly
all the gas produced was CO2. There was no obvious effect of inoculation
volume on the total gas production over 7 days. The volume
of carbon dioxide gas increased from the first day until days
6 of incubation. The maximum daily rate of gas production was