The effect of TS and C:N ratios on biogas production
via SS-AD was investigated with optimum F:I ratio. Total
solids concentrations of 16%, 25% and 35% with different C:N ratios
of 20:1, 30:1 and 40:1 were designed to evaluate their effect on the
biogas production via SS-AD. The urea was added to adjust the C:N
ratios. Biogas potential was determined in batch assays under
mesophilic conditions as described previously by Angelidaki et al.
(2011).