Abstract
Globally, food waste (FW) and sewage sludge (SS) are among major organic wastes that needs to be properly handled. Anaerobic digestion (AD) has been a widely accepted method to treat those wastes and simultaneously recover energy and nutrients. The objective of this study was to elucidate synergistic effects in co-digestion of FW and SS by incubating at mesophilic and thermophilic conditions. The results demonstrated temperature did not significantly affect the cumulative methane yields (CMY); instead, higher temperature resulted in accelerated methane production. Although not clearly shown on CMYs (less than 10% increase), positive synergistic effects on methane production rates were characterized by a co-digestion impact factor (CIF) during the early phase of co-digestion. This early synergism (up to 24% increase) was primarily attributed to the accelerated hydrolysis due to addition of readily degradable FW, which may have practical implication for selection of retention time in order to optimize digestion process.
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