Experiment 1: Thermophilic condition enables consistent co-fermentation of waste activated sludge and food waste.

Co-fermentation of WAS and FW (70:30 %VS) in continuous mode. • 35_A1: fermenter at 35 °C fed with WAS A with reference to batch 1. • 55_A1: fermenter at 55 °C fed with WAS A with reference to batch 1. • 35_A2: fermenter at 35 °C fed with WAS A with reference to batch 2. • 55_A2: fermenter at 55 °C fed with WAS A with reference to batch 2. • 35_B1: fermenter at 35 °C fed with WAS B with reference to batch 1. • 55_B1: fermenter at 55 °C fed with WAS B with reference to batch 1. • 35_B2: fermenter at 35 °C fed with WAS B with reference to batch 2. • 55_B2: fermenter at 55 °C fed with WAS B with reference to batch 2.