Degradation of Chloramphenicol by Ultraviolet Advanced Oxidation Technology

Abstract:

To realize the application of ultraviolet advanced oxidation technology on removing antibiotics in actual water treatment， this study took chloramphenicol （CAP） as the research object， and compared its removal efficiency by ultraviolet technology， ultraviolet advanced oxidation technology （UV/ H₂O₂， UV/PS） under static and continuous flow respectively. The influence of factors such as ultraviolet light intensity， ultraviolet light wavelength， residence time， oxidant dosage， initial concentration of chloramphenicol and raw water quality on the removal effect was further analyzed. The study results show that the ultraviolet technology under static flow can degrade more than 80% chloramphenicol after an irradiation of 120 min， and the degradation conforms to the first-order kinetics. Chloramphenicol removal rate by ultraviolet technology under continuous flow is limited due to the short irradiation time， but UV/H₂O₂ and UV/PS processes can enhance the removal rate of chloramphenicol to 58% and 43%， owing to the oxidation effect of oxidizing free radicals activated by ultraviolet. Increasing the intensity of ultraviolet light， the dosage of oxidant and reducing the initial concentration of chloramphenicol will increase the degradation of chloramphenicol. The presence of inorganic and organic pollutants in raw water will reduce the removal efficiency of UV advanced oxidation technology for chloramphenicol， but the inorganic and organic pollutants can also be removed during the oxidation， which provides the possibility for the promotion and application of UV advanced oxidation technology on the actual water treatment.

Key words:ultraviolet;advanced oxidation process;antibiotics;chloramphenicol