Characterization of Two-compartment Bioreactor for Anaerobic Biohythane Production: Effects of Kitchen Waste Concentration

Abstract

Anaerobic digestion is a promising technology for kitchen waste treatment, as it has high energy recovery and reduces environmental problems. A two-compartment bioreactor (TCR) constructed with a hydrogen compartment and a methane compartment with the working volume of 300 mL and 4700 mL respectively was cultivated at various kitchen waste from 10 to 80 g COD/L at hydraulic retention time 2 d to characterize the biohythane production performance. Results show biohythane composition H2, CH4 and CO2 were 0-9%, 35-48%, and 48-58%, respectively during steady-state conditions. After 80 days of cultivation, Firmicutes dominated the hydrogen compartment and Methanobacteriaceae and Methanomicrobiaceae dominated the methane compartment.