Thermally enhanced solid-liquid separation process in food waste biorefinery: modelling the anaerobic digestion of solid residues.

Over the stable period, the soluble COD remained always below 1 g L -1 in both reactors, without significant accumulation of VFAs ( Table 3 ); constant pH values of 7.1 ± 0.1 were recorded for Exp3, while an increasing trend of pH was observed for Exp4, reaching values of 7.6 ± 0.3 at the end of the test ( Figure 7 ).

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