臭氧混凝耦合体系中 H₂O₂ 对溴酸盐生成的抑制效果及相关机理

In this study, the inhibitory effect of H₂O₂ on bromate disinfection byproducts (BrO₃⁻) formation in the hybrid ozonation-coagulation (HOC) process was investigated, and the main generation pathway of BrO₃⁻ and the inhibitory mechanism of BrO₃⁻ generation by H₂O₂ addition were clarified. The results showed that when n(H₂O₂):n(O₃)>0.5, BrO₃⁻ formation could be effectively mitigated. When the ozone dosage was 4.5 mg·L⁻¹ and n(H₂O₂):n(O₃)=2, BrO₃⁻ production could be effectively controlled below 0.01 mg·L⁻¹. Through the analysis of BrO₃⁻ generation contribution rate and Br⁻ consumption kinetics, direct ozone oxidation was the main pathway of BrO₃⁻ generation in the HOC process, and the contribution rate maintained above than 80%. With the addition of H₂O₂, the contribution rate of •OH indirect oxidation increased, while ozone direct oxidation was still the main pathway for BrO₃⁻ generation with the contribution rate above 60%. With the addition of H₂O₂, the consumption reaction of Br⁻ was slow at first and then became fast.