摘要
近年来,抗生素的滥用导致大量富含抗生素的生活、工业废水排入污水处理厂,对污水生物处理单元构成了威胁,影响着污水处理厂的运行效果。氧氟沙星(OFL)是一类常见广谱抗生素,其种类多、使用量大且难以被生物代谢,频频在污水处理厂中被检出。以OFL为例研究了抗生素对活性污泥系统运行效果及代谢产物的影响。结果表明:OFL的投加导致系统的COD去除率及脱氮除磷性能下降,并且会导致活性污泥系统出现污泥膨胀现象;OFL的投加会刺激活性污泥微生物分泌更多的胞外聚合物(EPS),尤其是蛋白质(PN),以此来抵御OFL的毒害作用;OFL的投加抑制了胞内聚合物(PHA)及糖原的合成,并且抑制作用随着OFL浓度的增加而增加。
Over the last decade,the abuse of antibiotic has resulted a large amount of domestic/industrial wastewater rich of used antibiotic discharge to municipal sewage plant which poses a great threat to the sewage biological treatment units and affects the performance of municipal sewage plant.Ofloxacin(OFL)a kind of common broad-spectrum antibiotics is frequently detected in municipal sewage plan,which has been largely used in many areas and is difficult to be metabolized.In this study,the ofloxacin was used to examine the evolution of system performance and metabolic activities with the presence of antibiotic.The results indicated that the COD,ammonia nitrogen and phosphate removal rate decreased due to the dosing of OFL,which also caused slightly sludge bulking.The addition of OFL also stimulated more secretion of EPS especially the proteins,so as to resist the toxic effect of OFL.Furthermore,the synthesis of PHA and glycogen was inhibited as well and exhibited a dose-dependent pattern.
作者
叶超
陈毅刚
YE Chao;CHEN Yi-gang(Suzhou Sujing Environmental Engineering Co.,Ltd.,Suzhou 215122,China)
出处
《环境科技》
2020年第4期29-33,共5页
Environmental Science and Technology
关键词
抗生素
氧氟沙星
活性污泥系统
运行效果
代谢产物
Antibiotic
Ofloxacin
Activated sludge system
Wastewater treatment performance
Metabolic products
