Abstract
Single and two-phase operations were compared at mesophilic operating conditions using a digester system consisting of three 5-m3 reactors treating food waste generated daily within the university campus kitchens. When normalizing the methane production to the daily feedstock characteristics, significantly greater methane was produced during two-phase mesophilic digestion compared to the single-stage operation (methane yield of 380 vs 446-LCH4kgVS−1; 359 vs 481-LCH4kgCOD−1 removed for single vs two stage operation). The fermentation reactor could be maintained reliably even under very low loading rates (0.79±0.16kgCODm−3d−1) maintaining a steady state pH of 5.2.
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