过滤工艺条件对抗生素抗性细菌丰度的影响

Effect of Filtration Conditions on the Abundance of Antibiotic Resistant Bacteria

为探究不同过滤工艺运行条件对处理水中的抗生素抗性细菌去除效果的影响,该文设置不同滤料厚度、过滤停留时间和滤料粒径等工艺参数,分析处理后出水和滤料上残留的四环素抗性菌(TET)、诺氟沙星抗性菌(NOR)、磺胺甲恶唑抗性菌(SUL)及克林霉素抗性菌(CLI)的变化规律。结果表明,当石英砂滤料厚度由1 cm增加到5 cm,过滤停留时间由0 min增加到80 min及粒径由6 mm减小到0.3 mm时,出水中4类抗性细菌数目分别下降了56%~65%、34%~54%及44%~64%。相对于滤料粒径,滤层厚度和停留时间对出水和滤料上残留的抗性细菌丰度的影响更为显著。调节石英砂厚度及粒径更利于TET的去除及CLI的滤料存留;调节石英砂厚度及停留时间更利于SUL和CLI的去除及TET的滤料存留;调节石英砂厚度对NOR的去除及滤料存留效果均为最佳;调节石英砂粒径更利于SUL的滤料存留。

In order to explore the influence of different filtration process operating conditions on the removal effect of antibiotic-resistant bacteria in the treated water,this paper sets different filtration material thickness,filtration residence time,particle size and other technologic parameters.The changes of tetracycline resistant bacteria(TET),Norfloxacin resistant bacteria(NOR),Sulfamethoxazole resistant bacteria(SUL)and Clindamycin resistant bacteria(CLI)in treated water and filter media were analyzed.The results showed that when the thickness of the quartz sand filter material increased from 1 cm to 5 cm,the filtration residence time increased from 0 min to 80 min and the particle size decreased from 6 mm to 0.3 mm,the number of four resistant bacteria in the effluent decreased by 56%~65%,34%~54%and 44%~64%,respectively.Compared with the particle size of the filter material,the thickness of the filter layer and the residence time had more significant effects on the abundance of resistant bacteria remaining in the effluent and the filter material.Adjusting the thickness and particle size of quartz sand is more beneficial to the removal of TET and the retention of CLI filter material.The removal of SUL and CLI and the retention of TET filter material are better by adjusting the thickness and residence time of quartz sand.The removal effect of NOR and the retention effect of filter material are the best when the thickness of quartz sand is adjusted.Adjusting the particle size of quartz sand is more conducive to the retention of SUL filter material.