Biogas performance from co-digestion of Taihu algae and kitchen wastes
2013
Zhao, Ming-Xing | Ruan, Wen-Quan
Co-digestion of Taihu algae with high carbon content substrate can balance the nutrients in the fermentation process. In this study, optimal mixing ratio for co-digestion of Taihu algae and kitchen wastes were investigated in order to improve biogas production potential. The results indicated that the biogas yield reached 388.6mL/gTS at C/N15:1 group, which was 1.29 and 1.18times of algae and kitchen wastes only. The maximum concentration of VFA reached 4239mg/L on 8thday in kitchen wastes group, which was 1.21times of algae group. Neutral protease enzyme activity in algae group reached maximum of 904.2μg/(gTSh), while dehydrogenase enzyme at C/N 15:1 group reached maximum of 3402.2μgTF/(gTSh). The feasibility of adjusting the C/N with co-digestion of Taihu algae and kitchen wastes to increase biogas production was demonstrated. Remarkably, the C/N of 15:1 was found to be the most appropriate ratio.
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