Degradation Of Tbbpa By Ozone Combined Process And Byproducts Control

Currently, Tetrabromobisphenol A(TBBPA) has the world’s largest production and application amount among all kinds of BFRs. TBBPA has a high durability in environment, if living organisms have a long-term contact with TBBPA, it will produce toxic effects on endocrine system, nervous system and internal organs. This paper took ozonation technology as the research means, degradation rule of TBBPA degradation by ozonation was examined and several ozone combination processes were introduced to decrease the toxicity of reaction process, so as to remove TBBPA from water fast, efficiently and safely.The basic reaction rule of ozone removing TBBPA was investigated by static experiment, the results show that: when ozone dosage was 2 mg/L,p H was 6~9 and the temperature was 25 ± 1℃, TBBPA with the concentration of 1 mg/L can be completely removed in 2 mins. The degradation pathway of TBBPA is speculated to experience brominated organics(TOBr) such as tribromobisphenol A and dibromophenol or hydrocarbons such as tert-butyl Benzene, p-isopropenylphenol, then final open-loop or mineralization. Due to the formation of the intermediate product of TBBPA degradation process, biological toxicity variation shows a first increased and then decreased regularity. The investigation was focused on the generation rule of bromate, which is a kind of inorganic carcinogenic byproduct generated in the degeneration of TBBPA.In order to ensure the maximization of TBBPA removal while reducing the generation of bromate byproducts and decreasing toxicity of reaction process at the same time, three kinds of combination process were introduced, O3/H2O2 process, O3/KMn O4 process and O3/Fe2+ process. Among all the three kinds combination processes, O3/H2O2 process, O3/KMn O4 process both have a quick and efficient performance in the TBBPA removal and bromate reduction. O3/KMn O4 works best on reduction of toxicity in process.Finally, after the adjustment of process parameter, O3 process, O3/H2O2 process and O3/KMn O4 process is applied to treat actual wastewater, the results shows that:All the three processes especially for the two combination processes not only had a good treatment on all kinds of pollutants, but also excelled at biological toxicity reduction and biodegradability enhancement. Through the comparison of the treatment effect, feasibility and economic, O3/KMn O4 process is recommended to treat this kind of wastewater.