Fig. 4From: Enhancing methane production using anaerobic co-digestion of waste activated sludge with combined fruit waste and cheese wheySchematic of experimental system. 1) BMP reactor, 2) aquarium 3) saturated and acidified water, 4) automatic heater, 5) magnetic stirrer, 6) sampling pipe, 7) control valve, 8) biogas collecting pipe, 9) biogas control valve, 10) graduated cylinderBack to article page