Composite ceramic membranes from natural aluminosilicates for microfiltration applications

ALMANDOZ CRISTINA; OCHOA NELIO; PAGLIERO CECILIA; MARCHESE JOSÉ

CERAMICS INTERNATIONAL

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2015 vol. 41 p. 5621 - 5633

0272-8842

This work concerns to the development and characterisation of support, active layer and tubular composite membranes (CM) from naturalaluminosilicates as principal components (clay, bentonite, feldspar, quartz, alumina). The selection of these raw materials was primarily based ontheir low cost and they are locally produced. In the substrates preparation, the effect of materials compositions, additives, particle sizes, pasterheological properties, and drying-sintering temperatures was investigated. The consolidated ceramic substrates were characterised by SEM,DTA?TG, X-Ray diffraction, Hg intrusion, mechanical resistance, and waterflux measurements. Extrusion has been used as the forming processof tubular support. The CM was fabricated depositing a thin active layer by slip-casting method on the support. The CM sintered at 12001Cshowed the best structural characteristics, porosities of 50%, active layer pore size between 0.08 and 0.55μm. The CM hydraulic permeabilities(10?274 L/h m2kPa) were comparable and greater than several inorganic commercial membranes and CM obtained from other researches. TheCM microfiltration effectiveness was tested with different substances from food industry, i.e. slaughterhouse wastewater treatment and goat milkpasteurisation. The obtained results, insoluble residue rejections (100%) and high bacterial removal (87?99%), make the ceramic CM suitable formicrofiltration processes.&2015 Elsevier Ltd and Techna Group S.r.l. All rights reserve