Table 4: Value of model constants and coefficient of determination (R2) obtained from kinetic models fitted to cumulative biogas production data of biomethanization of mixed animal wastes co-digested with pineapple fruit waste and chicken rumen at different temperature.

Models Constant Variables Temperature(ºC)
25 30 40 50 60
Logistic Model a 2.823 4.506 5.065 5.301 5.572
b -2.823 -4.506 -5.065 -5.301 -5.572
k(day-1) 10.48 10.07 9.872 9.779 9.665
R2 0.4101 0.4135 0.4317 0.4282 0.4458
Exponential Rise to Maximum A(dm3/gm) 3.996 6.387 7.002 7.331 7.519
k(day-1) 0.04087 0.04069 0.04333 0.04334 0.04628
R2 0.9598 0.964 0.9676 0.9643 0.9652
Modified Gompartz Kinetic A(dm3/gm) 3.589 5.39 5.978 6.299 6.88
rm(dm3/gm/day) 47.02 73.54 164.6 203.5 205.7
λ(day) 0.5573 0.4994 0.4832 0.47 0.4412
R2 0.9837 0.9692 0.9713 0.9722 0.9819