Advanced technique of catalytic ozonation-enhanced coagulation for the efficient removal of low coagulability refractory organics from secondary effluent

The novel cascaded catalytic ozonation-enhanced coagulation process (FeCeAC/O-3-PAC) was developed much success towards second effluent organic matter (EfOM) in chemical industrial wastewater. Compared the conventional techniques, FeCeAC/O-3-PAC exhibited remarkable performances in the advanced removal EfOM. The characteristics of EfOM and interactivities of reaction process played the crucial roles. Especially, removal rate constant of soluble microbial products (SMPs) with FeCeAC/O-3-PAC exceeded 55.38% versus FeCeAC/O-3. The outstanding synergistic effect was contributed to the enhanced generation of active oxygen species by FeCeAC and PAC, which increased the content of oxygen-containing functional groups of EfOM thus facilitated the interaction between PAC and EfOM. As the result, the larger-sized flocs could be formed separated easily. Herein, this work found a far more effective way to remove EfOM especially low-coagulability refractory organics (LCRO) in chemical sewage plant.