Biomethane Production from co-fermentation of agricultural wastes

Abstract

Biomethane (CH4) was recovered from co-digestion process of waste glycerol and banana wastes. The wastes used contain waste glycerol with varying concentrations from 7.5 to 90 g L−1 and banana peel in the range 2.5–10 %w·v−1. The co-substrate mixture ratio was implemented in 0.5 L batch reactor operated at 37 °C and pH 7 for 120 h. The composition of biogas gas and liquid samples (COD, VFA, pH, alkalinity) were analyzed every 12 and 24 h, respectively. The optimum condition to produce CH4 was found at 7.5 g L−1 waste glycerol mixed with 7.5% banana peel. The highest CH4 yield and CH4 production potential were 0.281 m3 kg−1 COD and 652 mL, respectively.