[Removal Characteristics of Four Typical Antibiotics in Denitrification System]
Jia Tang1,2, Xi Chen1,2, Mu-Chuan Qin1,2
1School of Metallurgy and Environment, Central South University, Changsha 410083, China.
Abstract:
Wastewater treatment plants are an important gathering place for antibiotics, where denitrification plays a vital role in biological nitrogen removal. In order to explore the removal characteristics of antibiotics in a denitrifying sludge system, norfloxacin (NOR), oxytetracycline (OTC), sulfamethoxazole (SMX), and trimethoprim (TMP) were selected to investigate their transformation under different carbon source conditions in a denitrification system. The contribution of adsorption and biodegradation for antibiotic removal was also evaluated in this study. The results showed that a certain proportion of NOR, OTC, and TMP could be removed by denitrification, whereas NOR and OTC could act as the sole carbon source for denitrification. The removal of NOR and OTC showed a rapid adsorption and then slow biodegradation trend in the denitrification system. The contributions of adsorption were recorded as 83.5% and 58.9% for NOR and OTC removal, respectively. More than 40% were adsorbed by extracellular polymer substances (EPS), whereas the P450 enzyme played an important role in the OTC biodegradation process, with a contribution of 20%.
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