4th WCSET-2015 at Japan
Mechanical Engineering:
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:
113-119