(1) bio-treated wastewater tank for BAF; (2) bio-treated wastewater for ozonation-BAF; (3) ozone generator; (4)
peristaltic pump; (5) ozonation reaction column; (6) first gas washing trap (KI, 2%); (7) second gas washing trap (KI, 20%); (8) middle tank; (9) peristaltic pump; (10) ozone
BAF column; (11) BAF column; (12) backwashing outlet; (13) BAF outlet; (14) backwashing inlet; and (15) air compressor