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Comparative Performance Studies on Biomethane Production from Biodegradable Wastes and Cattle Manure Based on Inoculums Source

Muhammad Rashed Al Mamun and Shuichi Torii
Department of Advanced Mechanical System Engineering, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555 Japan
Abstract—Cattle manure (CM) is an excellent raw material for anaerobic co-digestion of organic wastes with low carbon content can improve the fermentation stability. Several comparative assays were conducted on the anaerobic co-digestion of cattle manure (CM) with three organic wastes (ORs), namely, cafeteria waste (CW), vegetable waste (VW) and fruit waste (FW), under different mixing ratios in absence and presence of inoculum. All digesters were implemented simultaneously under mesophilic temperature at (30 ±2 °C) with a total solid concentration of 8 to 15%. Result showed that the combination of CM with CW, VW or FW significantly improved biogas production at all ratios. The ratios CW:CM (50:50), VW:CM (50:50), and FW:CM (25:75) produced the highest biogas yields from different co-substrates (20585, 16037 and 16624 mL, respectively) after 45 days of fermentation. The highest average methane yields of CW:CM (50:50), VW:CM (50:50), and FW:CM (25:75) were 63%, 61.2%, and 61.3% which showed that 1.0, 1.03 and 1.02 times higher than that of CW:CM (50:50), VW:CM (50:50), and FW:CM (25:75) without inoculum, respectively. In this study, compared effects of inoculum in digestion of cattle manure and organic wastes treatments, biogas was generated slightly higher than without inoculums digestion. This result was caused by the high methanogenic bacteria content in co-digestion medium, which enhanced biodegradation.

Index Terms—anaerobic co-digestion, methane, inoculums, cattle manure (CM), organic wastes (ORs).

Cite: Muhammad Rashed Al Mamun and Shuichi Torii, "Comparative Performance Studies on Biomethane Production from Biodegradable Wastes and Cattle Manure Based on Inoculums Source," Journal of Advanced Agricultural Technologies, Vol. 2, No. 1, pp. 50-56, June 2015. Doi: 10.12720/joaat.2.1.50-56
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