Optimisation of biogas yields from anaerobic digestion by feedstock type - The Biogas: Science, Production and Applications - page 136

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6.3 Relationship between organic loading rate (OLR) and specific

methane yield (SMY), volumetric methane production (VMP) and
hydraulic retention time (HRT) for two different substrate VS contents
but with the same SMY. (Note different scales on right-hand vertical
axes.) (a) Substrate VS 60 g L 1 . (b) Substrate VS 250 g L 1 .

laboratory scale. In both of the cases shown in Fig. 6.3, the point of
inflection on the SMY curve represents a loading above which some of the
methane potential of the substrate is lost, and for maximum methane