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Biotoxicity evaluation of zinc oxide nanoparticles on bacterial performance of activated sludge at COD,nitrogen,and phosphorus reduction

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Frontiers of Environmental Science & Engineering 2022年第2期16卷 51-62页

作者： Hasti Daraei kimia toolabian Ian Thompson Guanglei Qiu Environmental Health Engineering Research Center Kerman University of Medical SciencesKermanIran Department of Environmental Health Engineering Faculty of Public HealthKerman University of Medical SciencesKermanIran Faculty of Agriculture and natural resources Lorestan UniversityKhorramabadIran Department of Engineering Science University of OxfordParks RoadOxford OX13PJUK School of Environment and Energy South China University of TechnologyGuangzhou 510006China

The unique properties and growing usage of zinc oxide nanoparticles increase their release in municipal wastewater treatment ***,these nanoparticles,by interacting with microorganisms,can fail the suitable functioning of biological systems in treatment *** this reason,research into the toxicity of ZnO is *** the present study,the toxicity mechanism of ZnO-NPs towards microbial communities central to granular activated sludge(GAS)performance was assessed over 120-day *** results demonstrate that the biotoxicity of ZnO-NPs is dependent upon its dosage,exposure time,and the extent of reactive oxygen species(ROS)***,GAS performance and the extracellular polymeric substances(EPS)content were significantly reduced at 50 mg/L *** exposure led to decreases in the activity of ammonia monooxygenase(25.2%)and nitrate reductase(11.9%)*** Field emission scanning electron microscopy images confirmed that ZnO-NPs were able to disrupt the cell membrane integrity and lead to cell/bacterial death via intracellular ROS generation which was confirmed by the Confocal Laser Scanning Microscopy *** exposure to the NPs,the bacterial community composition shifted to one dominated by Gram-positive *** results of this study could help to develop environmental standards and regulations for NPs applications and emissions.

关键词： Granular sludge Biotoxicity Reactive oxygen species Extracellular polymeric substances

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