Fig. 10From: Improvement of anaerobic digestion of sewage mixed sludge using free nitrous acid and Fenton pre-treatmentSchematic of experimental system. (1) Biochemical methane potential reactor, (2) aquarium, (3) saturated and acidified water, (4) automatic heater, (5) magnetic stirrer, (6) sampling pipe, (7) sampling control valve, (8) biogas collecting pipe, (9) biogas control valve, (10) graduated cylinderBack to article page