In the ozone–BAF integrated device, ozone utilization rate was
increased because it was mixed with feed stream through a venture
tube. There were several ways of removing pollutants in the BAF tank:
ozonation of the refractory compounds; biological conversion of the
organic matter by biomass attached onto the medium surface; and
physical removal of suspended solid by medium filtration [17]. These
effects in the integrated device cooperated to enhance the biodegradation
and lead to a significant reduction of color, SS and COD.