Research on reaction mechanism for the catalytic ozonation of fulvic acid and NPnEO

To improve the safety of sewage recycle, the catalytic ozonation mechanism and oxidation kinetics of fulvic acid and nonylphenol ethoxylates (NP_nEO) were studied using T_iO₂/AC /Iron as a catalyst of catalytic oxidation. The results show that: compared with the ozone oxidation alone, the removal of organisms in catalytic ozonation was higher, after the reaction 20min, the removal of COD in fulvic acid solution was more than 60%, and the number of UV₂₅₄ was nearly 50% as well as the number of NP_nEO was 99.65 %; the catalytic ozonation of NP_nEO and fulvic acid were first order reactions;at the early stage of oxidation, the distribution of polymerization degree on NP_nEO was still consistent with the Poisson distribution, As the reaction progressed,the NP_nEO with small polymerization degree such as NP₁EO and NP₂EO started to accumulate.