Manufacture and characterisation of composite graded filter membranes for microfiltration

Zhao, Li

Dissertation / PhD Thesis/Book

Manufacture and characterisation of composite graded filter membranes for microfiltration

Zhao, L. (Corresponding author)FZJ*

2003
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag, Berichte des Forschungszentrums Jülich 4079, IV, 126 p. (2003) = Bochum, Univ., Diss., 2003

Please use a persistent id in citations: http://hdl.handle.net/2128/297

Report No.: Juel-4079

Abstract: Microfiltration is specifically the filtration of substances that range in size from 0.05 $\mu$m to 10 $\mu$m, which has two common forms - through-flow (dead-end) and cross-flow. Microfiltration is used in both production and analytical applications, such as the filtration of particles from liquid or gas streams for different industries, e.g. chemical or pharmaceutical, clarification and sterile filtration and waste water treatment etc. In this work composite microfiltration membranes were developed combining rugged substrates (both planar and tubular) made of sintered stainless steel powder with a patented coating technology - thé wet powder spraying (WPS) method, in which a sintered titanium dioxide layer is permanently bonded to the porous stainless steel substrates. Through the optimisation of a conventional composition of the TiO$_{2}$ suspension, the spraying process of the WPS method and the sintering process of the graded structure, stable TiO$_{2}$ membrane layers are being developed with an average pore size of 0.1 $\mu$m and a thickness of 20$\sim$30 $\mu$m. Due to the utilisation of the ultrasonic wave and grinding methods the imperfections in the membranes could be decreased distinctly. In order to investigate the flow process inside the graded structure, mathematical models were developed to simulate the flow rate both by fluid and gas. A modification was done to improve the models through comparing the calculated results with the measured results, which proved furthermore that the models were quite reliable in the simulation of such structures.

Note: Record converted from VDB: 12.11.2012
Note: Bochum, Univ., Diss., 2003

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