Abstract
To improve the safety of sewage recycle, The catalytic ozonation mechanism and oxidation kinetics of fulvic acid and nonylphenol ethoxylates (NP <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</inf> EO) were studied using TiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> /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 UV <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">254</inf> was nearly 50% as well as the number of NP <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</inf> EO was 99.65 %; the catalytic ozonation of NP <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</inf> EO and fulvic acid were first order reactions;at the early stage of oxidation, the distribution of polymerization degree on NP <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</inf> EO was still consistent with the Poisson distribution, As the reaction progressed, the NP <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</inf> EO with small polymerization degree such as NP <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</inf> EO and NP <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> EO started to accumulate.
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