The optimum S/X ratio is varied
among the substrates [4]. For example, digesting food waste and
the inoculum obtained from mesophilic anaerobic digester at
Guelph's wastewater treatment plant in Ontario, Canada, required
an S/X ratio of 0.25 to achieve a maximum MY of 1400 mL CH4/g-VSSsub, while digesting food waste and the inoculum obtained from
the mesophilic anaerobic digester at Dufferin Organics Processing
Facility in Toronto, Canada, required an S/X ratio of 0.5 to achieve a
lower maximum MY of 790 mL CH4/g-VSSsub [5].