文章基本信息

标题：MITIGATION OF ADVERSE EFFECTS OF ZINC OXIDE NANOPARTICLES ON ENHANCED BIOLOGICAL PHOSPHORUS REMOVAL: ROLE OF CARBON SOURCE CONCENTRATION
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作者：Yinguang Chen ; Yuanyuan Wei ; Lijuan Wu 等
期刊名称：Fresenius Environmental Bulletin
印刷版ISSN：1018-4619
出版年度：2015
卷号：24
期号：5
页码：1699-1706
语种：English
出版社：PSP Publishing
摘要：The potential risks of zinc oxide nanoparticles (ZnO NPs) to wastewater treatment processes have received much attention due to their large-scale production and application. However, little information is available regarding the mitigation of nanomaterials-induced negative effects on biological nutrient removal. In this study, an effective method, i.e., by increasing carbon source concentration, for mitigating ZnO NPs-induced toxicity to the performance of enhanced biological phosphorus removal (EBPR) was reported. When the microorganisms of a labscale EBPR were exposed to ZnO NPs of 5 mg/L, the effluent soluble ortho-phosphorus (SOP) concentration could be remarkably decreased from 13.2 to 0.7 mg/L by the increase of influent carbon concentration from 100 to 300 mg chemical oxygen demand (COD)/L. The mechanism investigation showed that the increase in carbon source concentration enhanced the viability of activated sludge and the metabolism of phosphorus-accumulating organisms. Further enzyme assays revealed that the activities of key enzymes (exopolyphosphatase and polyphosphate kinase) related to phosphorus removal were improved by the increase in carbon source concentration.
关键词：ZnO NPs; Carbon source; Biological phosphorus removal; Mitigation; Intracellular metabolism; Enzyme activity