Cumulative biogas yields of sample A and sample B have been plotted against 1/retention time keeping all other
parameters constant as shown in fig. 7. The figure shows linear relationship of biogas yield with 1/retention time
which agrees well with literature prediction. Ultimate values of biogas yields (B0) of the samples represent the
biogas yield as residence time approaches infinity. B/B0 is termed biodegradability constant, a similar constant
as stated by Chen and Hashimoto (3, 4, 5). Ultimate biogas yield has been calculated from graph by
extrapolating the lines where 1/retention time approaches zero and its value is nearly 100 lit/kg of D.M. for both