Performance study of chloramphenicol degradation by UV/O3/peroxysulfate process

CHANG Tao; LU Xian; WU Wen-fang; DING Lei; ZHAO Zhi-miao; ZHANG Yin-jiang

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China Environmental Science ›› 2025, Vol. 45 ›› Issue (5) : 2849-2856.

Emerging Contaminants

Performance study of chloramphenicol degradation by UV/O₃/peroxysulfate process

CHANG Tao¹, LU Xian^1,2, WU Wen-fang¹, DING Lei³, ZHAO Zhi-miao¹, ZHANG Yin-jiang¹

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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.

Key words

chloramphenicol / degradation mechanism / ozone / persulfate / ultraviolet

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CHANG Tao, LU Xian, WU Wen-fang, DING Lei, ZHAO Zhi-miao, ZHANG Yin-jiang. Performance study of chloramphenicol degradation by UV/O₃/peroxysulfate process[J]. China Environmental Science. 2025, 45(5): 2849-2856

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