Mesophilic anaerobic digestion of broadleaf cattail suspensions using the fermented residues of yeast production as inoculum

Mesophilic anaerobic digestion of broadleaf cattail suspensions using the inoculum sampled from yeast residues digester was studied experimentally. Two-parameter lab-scale experiment was realized using the suspensions with total solids (TS) content 5 wt% and 10 wt% and with inoculum TS based fractions 0.05 and 0.2. Maximum specific biogas yield was obtained for suspension with TS 10 wt% and inoculum fraction 0.2. Biogas output intensified with increasing both TS content and inoculum mass fraction, and the effect of inoculum was stronger. Thermo-gravimetric analysis showed the increasing of the content of thermally unstable components in digestate with an increase of inoculum content.