Thermo- and mesophilic anaerobic digestion of wheat straw by the upflow anaerobic solid-state (UASS) process

► Anaerobic digestion of wheat straw in UASS reactors was examined. ► The emphasis was to observe process behavior at different temperature levels. ► Thermophilic temperature showed faster degradation and methane yields. ► Lignocellulosic substrate is degraded within a short hydraulic retention time. ► A significant difference in nutrient demand at different temperature levels was observed.