Figure 2. Schematic diagram of ASFFR and related equipment. (1) aerated submerged fixed-filmbioreactor, (2) round diffuser, (3) air compressor, (4) activated carbon column, (5, 8 and 12) cutoff valve, (6) air rotameter, (9) wastewater pump, (10) equalization tank, (11) floater, (13) reservoir.