1. College of Oceanography and Ecological Science, Shanghai Ocean University, Shanghai 201306, China; 2. State Key Laboratory of Pollution Control Reuse, Tongji University, Shanghai 200092, China; 3. Engineering Research Center of Biofilm Water Purification and Utilization Technology, Anhui University of Technology, Maanshan 243032, China
Abstract：The UV/O3/PS process was used for the degradation experiments of chloramphenicol, the degradation performance of the combined UV/O3/PS process, UV/PS, O3/PS and UV/O3 processes was investigated, the contribution of major active free radicals to CAP degradation was analyzed for the reaction system, the effects of PS concentration, O3 concentration, pH, and the common inorganic anions and natural organics on the degradation were examined respectively, the degradation pathway of CAP and the formation potential of disinfection by-products were clarified, also the calculation of energy consumption for the UV/O3/PS process was discussed. The results showed that the CAP removal by the combined UV/O3/PS process was 90.41% at 60min. 1O2, HO· and SO4?- were the three main active species in the reaction system, and their contributions to CAP degradation were 53.85%, 25.64% and 12.82% in turn. the ncrease of PS and O3 concentrations favored the degradation of CAP, and alkaline conditions could promote the degradation of CAP, co-existing Cl-, HCO3- and humic acid inhibited the degradation of CAP. the degradation mechanism of CAP by the UV/O3/PS system mainly involved the hydroxylation, amino oxidation and C-N bond breaking or something. The formation potential of trichloromethane and trichloroacetonitrile was significantly increased through CAP pre-oxidation treatment, the formation potential for trichloromethane increased from 30.35μg/L to 48.08μg/L and that of trichloroacetonitrile from 12.31μg/L to 20.97μg/L. Energy consumption evaluation showed that the UV/O3/PS process has a better overall efficiency.
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