Separation of titanium dioxide from photocatalytically treated water by cross-flow microfiltration.
This study focuses on the separation of titanium dioxide from water by cross-flow microfiltration (CMF) within wastewater treatment by photocatalysis using slurry reactor systems. The systematic studies have shown that the separation performance of TiO2 particles is strongly affected by cross-flow velocity, transmembrane pressure, feed concentration, pH of the suspension and ionic strength. An extreme sensitivity to pH and electrolyte concentration indicates the importance of interfacial effects in solid-liquid separation of TiO2 particles. Under optimal conditions, permeate fluxes of up to 1250 l m-2 h-1, approaching those of pure water, could be obtained with a polypropylene membrane which is not sensitive to abrasion. The obtained results makes TiO2 separation by cross-flow microfiltration attractive in solar-catalytic detoxification.
Institut für Thermische Verfahrenstechnik, Technische Universität Clausthal Leibnizstrasse 15, D-38678 Clausthal-Zellerfeld, Germany.
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Geissen
D004867:Equipment Design; D005374:Filtration / Q000379:methods; D006863:Hydrogen-Ion Concentration; D008567:Membranes, Artificial; D010782:Photolysis; D011126:Polypropylenes; D014025:Titanium / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
D008567:Membranes, Artificial; D011126:Polypropylenes; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014025:Titanium