The UV/chlorine process is being considered an emerging advanced oxidation process in water treatment. The kinetics and mechanism of trimethoprim (TMP), a kind of pharmaceuticals, by the UV/chlorine process was investigated. The degradation of TMP was much faster by UV/chlorine compared to UV/H2O2 and chlorination. The contribution of reactive chlorine species (RCS, including Cl., Cl2.− and ClO.) to the degradation removal rate was much higher than that of HO. and increased with increasing pH. The increasing contribution of RCS to the degradation with increasing pH was attributable to the increase in the ClO. concentration. RCS reacted with TMP much faster than HOCl/OCl− to form chlorinated products and all the chlorinated products could be further depleted to produce products with less degree of halogenation in the UV/chlorine process. This study firstly emonstrated the importance of ClO., in the degradation of micropollutants in the UV/chlorine process.

Reactive chlorine species significantly contributes to the degradation of trimethoprim in the UV/chlorine process

253rd National Meeting (2017)

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