Analysis of
variance and test of significance were carried out to test
for significant differences in biogas production in digester.
Thus, any of the three designs may have been appropriate
for the experiment. The cumulative biogas yield from
450 g (1:0.5 waste to water ratio) slurry of poultry and
cattle dung digested over a period of seven days at room
temperature was found to be 26.86, 24.86 and 22.30 mL
at thermophillic temperature (370C). Mixing or shaking
the digester is very important as it prevents scum
formation within the digester.