Combined thermal hydrolysis pretreatment and anaerobic co-digestion of waste activated sludge and food waste

In this study, the impact of thermal hydrolysis pretreatment (THP) on mono- and co-digestion thickened waste activated sludge (TWAS) food (FW) was carried out at temperatures 150, 170, 190, 210 °C volumetric ratios 90:10, 70:30, 50:50 in batch anaerobic tests. THP enhanced solubilization, reduced volatile suspended solids (VSS) particle size TWAS as temperature increased showing optimal improvements 170 °C. showed no significant FW with only marginal 150 Increasing beyond for deteriorated biodegradability forming refractory compounds. Co-digestion improved methane yields kinetics contribution increased. thermally pretreated by 27% 29% synergism. 15% 25% °C, up to 21% synergy. mixed feedstocks 53% 92% becoming less pronounced increase volume temperature.