Influence of pH Adjustment and Inoculum on Anaerobic Digestion of Kitchen Waste for Biogas Producing

Kitchen waste as the main component of municipal waste with high-moisture and high-organic has become one of the key environmental problems. Anaerobic digestion was considered a most promising alternative for handling this kind of waste for waste reduction and clean energy production. The batch fermentation for kitchen waste from university dinning service with different organic concentrations were conducted with and without pH value adjustment at 35 degrees C. The results showed that maximum VS concentration can reach 25 g/L without pH adjustment, highest biogas yield 938.6 mL/g VS was achieved at 20 g/L and highest methane yield was 506.44 mL/g VS at 16 g/L adjust the pH value, the maximum organic loading can reach 45 g/L with a higher biogas and a methane yield compared with and without adding Ca(OH)(2). The effects of feed to inoculums ratio (three kinds of F/M ratio 0.26, 0.36, and 0.6) on the anaerobic digestion performance were studied. Appropriate inoculum (F/M = 0.36) can improve the digestion efficiency and biogas production.