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

Publication Type:
Journal Article
Citation:
Bioresource Technology, 2014, 152 pp. 101 - 106
Issue Date:
2014-01-01
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Effects of the suspended titanium dioxide nanoparticles (TiO2NPs, 50mg/L) on the cake layer formation in a submerged MBR were systematically investigated. With nanometer sizes, TiO2NPs were found to aggravate membrane pore blocking but postpone cake layer fouling. TiO2NPs 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 TiO2NPs. Line-analysis and dot map of energy-dispersive X-ray were also carried out. Since TiO2NPs 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 TiO2NPs. © 2013 Elsevier Ltd.
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