Effects of suspended titanium dioxide nanoparticles on cake layer formation in submerged membrane bioreactor

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• 作者：Lijie Zhou ; Zhiqiang Zhang ; Siqing Xia ; Wei Jiang ; Biao Ye ; Xiaoyin Xu ; Zaoli Gu ; Wenshan Guo ; Huu-Hao Ngo ; Xiangzhou Meng ; Jinhong Fan ; Jianfu Zhao
• 关键词：Membrane bioreactor ; Titanium dioxide nanoparticles ; Cake layer ; Membrane fouling
• 刊名：Bioresource Technology
• 出版年：January, 2014
• 年：2014
• 卷：152
• 期：Complete
• 页码：101-106
• 全文大小：573 K

文摘

Effects of the suspended titanium dioxide nanoparticles (TiO₂ NPs, 50 mg/L) on the cake layer formation in a submerged MBR were systematically investigated. With nanometer sizes, TiO₂ NPs were found to aggravate membrane pore blocking but postpone cake layer fouling. TiO₂ NPs showed obvious effects on the structure and the distribution of the organic and the inorganic compounds in cake layer. Concentrations of fatty acids and cholesterol in the cake layer increased due to the acute response of bacteria to the toxicity of TiO₂ NPs. Line-analysis and dot map of energy-dispersive X-ray were also carried out. Since TiO₂ NPs inhibited the interactions between the inorganic and the organic compounds, the inorganic compounds (especially SiO₂) were prevented from depositing onto the membrane surface. Thus, the postponed cake layer fouling was due to the changing features of the complexes on the membrane surface caused by TiO₂ NPs.