Biomethane Production from Co-digestion of Banana Peel and Waste Glycerol

摘要

Banana peel and biodiesel derived glycerol are one of the most abundant agricultural waste in Southeast Asiancountries. This current research demonstrated potential biomethane production from co-digestion of agriculturalwastes under mesophilic fermentation. The wastes used include (1) banana peel (varying total solids in the range 2.5-10% w/v) and (2) Banana peel mixed with pure or waste glycerol. All treatments were setup in duplicate in 0.5 Lbatch reacotr. Gas and liquid samples were collected every 12 and 24 hr, respectively. Maximum methane productionpotential and yield were 181 mL and 188 mL g~(-1) TS at 7.5% banana peel. The maximum methane productionpotential and yield of 7.5% banana peel mixed with 7.5 g L~(-1) pure glycerol (in the presence of buffer) were467 mL and 151 mL g~(-1) COD, respectively, while those of 7.5% banana peel mixed with 7.5 g L~(-1) waste glycerol (inthe presence of buffer) were 652 mL and 281 mL g~(-1) COD, respectively. Small amount of VFAs and ethanol wasaccumulated in the reactor content. The current findings indicate the potential use of glycerol waste as a co-substratein biomethane production.