Effects of size and thermophilic pre-hydrolysis of banana peel during anaerobic digestion, and biomethanation potential of key tropical fruit wastes
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Date
2017-07-11
Journal Title
Journal ISSN
Volume Title
Publisher
Waste Management
Abstract
Methane production potential of tropical fruit wastes, namely lady-finger banana peel, rambutan waste
and longan waste were compared using BMP assay and stoichiometric modified Buswell and Mueller
equation. Methane yields based on volatile solid (VS) were in the order of ground banana peel, chopped
banana peel, chopped longan waste, and chopped rambutan waste (330.6, 268.3, 234.6 and 193.2 mLCH 4 /
gVS) that corresponded to their calculated biodegradability. In continuous operations of banana peel
digestion at feed concentrations based on total solid (TS) 1–2%, mesophilic single stage digester run at
20-day hydraulic retention time (20-day HRT) failed at 2%TS, but successfully recovered at 1.5%TS. Pre-
hydrolysis thermophilic reactor (4-d HRT) was placed as pre-treatment to mesophilic reactor (20-d
HRT). Higher biogas (with an evolution of H 2 ) and energy yields were obtained and greater system sta-
bility was achieved over the single stage digestion, particularly at higher solid feedstock. The best perfor-
mance of two stage digestion was 68.5% VS destruction and energy yield of 2510.9 kJ/kgVS added at a
feed concentration of 2%TS.
Description
Keywords
Banana peel, Fruit waste, Digestion, Hydrogen, Methane, Pre-hydrolysis