Keywords: anaerobic digestion, hydrolysis reactors, inhibition, leachate, methanogenesis, OFMSW, organic fraction, municipal solid waste, MSW, UASB, upflow anaerobic sludge blanket, waste treatment, aerobic composting, effluent recycling
Anaerobic digestion of Organic Fraction of Municipal Solid Waste (OFMSW) in two-phase system
In view of recovering energy resource from the treatment of Organic Fraction of Municipal Solid Waste (OFMSW), anaerobic digestion of OFMSW prior to aerobic composting as post-treatment was considered. This study aimed to determine the operational characteristics and efficiency of a two-phase system composed of a fed-batch hydrolysis reactor (phase I) and a methanogenic Upflow Anaerobic Sludge Blanket (UASB) reactor (phase II). The effluent of the UASB reactor was recycled to the phase I reactor to avoid high levels of Volatile Fatty Acids (VFAs), which may inhibit methanogenesis and hydrolysis of solids.