The biogas generation versus the HRT is shown in Fig. 5 for
varying influent volatile solid concentration. For example, in
the case of an influent volatile solid concentration of 46 g/L the
cumulative biogas generation was found to be 40, 168 and 232 L
at an HRT 3, 10 and 18 days, respectively. While at an influent
volatile solid concentration of 66 g/L the biogas generation was
found to be 65, 190 and 330 L, whereas at an inlet volatile
solid concentration of 84 g/L the biogas generation was 87, 220
and 380 L, respectively for the above said HRT. The average
biogas generation was found to be 0.73m3/kg of volatile solids
destroyed during the anaerobic digestion of mixed fruit peel
waste at an HRT above 5 days.