ISSN 2319-5347, ISI Impact Factor: 0.763

VOLUME 03 NO 04 OCTOBER 2015

Title:        Possibility of Anaerobic Co-digestion of Cafeteria, Vegetable and Fruit Wastes for Biogas Production without Inoculum Source
Authors:    Muhammad Rashed Al Mamun, Shuichi TORII
Abstract:   Co-digestion of cafeteria, vegetable and fruit wastes was anaerobically digested, in order to recover methane as a source of renewable energy. Here we report the optimal biogas production and methane yields from variable mixing ratios without bacteria inoculums added using batch digesters under mesophilic conditions. The lab scale digestion experiment was carried out in 200 L polypropylene digesters. The result showed that the co-digestion process significantly influenced the biogas and methane yields. The maximum biogas yield obtained for the mixing ratio CW:VW:FW of (0.5:1.0:1.5, 1.0:1.5:0.5, 1.5:0.5:1.0 and 1.0:1.0:1.0) were 33.92, 35.52, 36.55 and 43.87 L/d, at the 25th, 24th, 24th, and 21th day, respectively. The cumulative result showed that an increase of 48.3%, 19.95%, and 8.61% gas yields of mixing ratio CW:VW:FW
(1.0:1.0:1.0) compared with other ratios of CW:VW:FW (0.5:1.0:1.5, 1.0:1.5:0.5, and 1.5:0.5:1.0), respectively. It was observed that the average methane concentration CW: VW: FW of (0.5:1.0:1.5, 1.0:1.5:0.5, 1.5:0.5:1.0 and 1.0:1.0:1.0) were 59.95%, 60.07%, 61.41%, and 63.61%, respectively. Thus, the optimum mixing ratio suggested that the co-digestion technique can be promising to produce valuable gas products and to reduce environmental pollutions simultaneously.

Keywords:    Anaerobic co-digestion, Renewable energy, Methane, Cafeteria waste (CW), Vegetable waste (VW), Fruit waste (FW)
Pages:              219-225

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