污水处理厂消毒技术对抗生素抗性菌的强化去除

基于消毒技术对污水处理厂出水中总异养菌(total heterotrophic bacteria,HPC)及5种抗生素抗性菌(antibiotic resistant bacteria,ARB):氨苄霉素抗性菌(AMP)、红霉素抗性菌(ERY)、四环素抗性菌(TET)、卡那霉素抗性菌(KAN)、环丙沙星抗性菌(CIP)的去除情况研究,分析消毒技术对ARB的强化去除效果.结果表明,实际污水处理厂的紫外消毒对ARB去除率仅为18.2%~40.9%,且AMP含量最高;另外,消毒技术对ERY有选择性去除效果,对其他4种ARB无明显选择性去除效果(P0.05);最后结合次氯酸钠、臭氧、紫外消毒处理对COD、NH_4~+-N的去除效果,确定强化去除ARB的消毒方式中臭氧,次氯酸钠和紫外的最佳浓度和剂量依次为5.0 mg·L~(-1)、25.0 mg·L~(-1)和45.0 m J·cm~(-2),ARB去除率依次为45.5%~74.5%、66.1%~85.5%、68.6%~85.5%,另外次氯酸钠耦合紫外消毒强化去除ARB的效果更佳.

Enhanced Antibiotic Resistant Bacteria Removal from Wastewater Treatment Plant by Different Disinfection Technologies

Based on the removal of total heterotrophic bacteria (HPC) and antibiotic resistant bacteria (ARB), including the ampicillin resistant bacteria (AMP), erythromycin resistant bacteria (ERY), tetracycline resistant bacteria (TET), kanamycin resistant bacteria (KAN), and ciprofloxacin resistant bacteria (CIP), this study investigates the enhanced removal performance of ARB by different disinfection technologies. The experimental results showed that ARB removal by ultraviolet (UV) disinfection from the wastewater treatment plant (WWTP) was only 18.2%-40.9% and AMP was the highest in content. ERY could be selectively removed by different disinfection technologies; however, there was no distinguished selective removal performance for other four types of ARB (P<0.05). For ARB, COD and NH₄⁺-N removal, the optimal ozone, chlorination, and UV concentration or dosage were 5.0 mg·L^-1, 25.0 mg·L^-1, and 45.0 mJ·cm^-2, respectively, and the corresponding ARB removal efficiencies were 45.5%-74.5%, 66.1%-85.5%, and 68.6%-85.5%. Furthermore, the combined UV and chlorine treatment could achieve better ARB removal performance.