Composite ceramic membranes from natural aluminosilicates for microfiltration applications |
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| Affiliation: | 1. Area de Química Física, FQByF (UNSL), Argentina;2. Departamento de Tecnología Química-Facultad de Ingeniería (UNRC-CONICET), Argentina;3. Instituto de Física Aplicada – INFAP Departamento de Química Universidad Nacional de San Luis-CONICET, Chacabuco 917, 5700 San Luis, Argentina;1. Ceramics Laboratory, Physics Department, Constantine University 1, Constantine 25000, Algeria;2. Physics Department, Jijel University 1, Jijel 18000, Algeria;1. Department of Chemical Engineering, Indian Institute Technology Guwahati, Guwahati, 781039, Assam, India;2. Center for the Environment, Indian Institute Technology Guwahati, Guwahati, 781039, Assam, India;3. Department of Biosciences and Bioengineering, Indian Institute Technology Guwahati, Guwahati 781039, Assam, India;1. Department of Inorganic Chemistry, University of Yaoundé I, Faculty of Science, P.O. Box 812, Yaoundé, Cameroon;2. Institut Europeen des Membranes, UMR 5635 CNRS ENSCM UMII, CC 047, Place Eugene Bataillon, F-34093 Montpellier Cedex, France;3. Department of Applied Chemistry, University of Ngaoundéré, P.O. Box 455, Ngaoundéré, Cameroon;1. Instituto Universitario de Tecnología Cerámica, Universitat Jaume I. Castellón, Spain;2. Instituto de Investigación en Ingeniería de Aragón, Universidad de Zaragoza, Spain |
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| Abstract: | This work concerns to the development and characterisation of support, active layer and tubular composite membranes (CM) from natural aluminosilicates as principal components (clay, bentonite, feldspar, quartz, alumina). The selection of these raw materials was primarily based on their low cost and they are locally produced. In the substrates preparation, the effect of materials compositions, additives, particle sizes, paste rheological 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 water flux measurements. Extrusion has been used as the forming process of tubular support. The CM was fabricated depositing a thin active layer by slip-casting method on the support. The CM sintered at 1200 °C showed the best structural characteristics, porosities of 50%, active layer pore size between 0.08 and 0.55 μm. The CM hydraulic permeabilities (10–274 L/h m2 kPa) were comparable and greater than several inorganic commercial membranes and CM obtained from other researches. The CM microfiltration effectiveness was tested with different substances from food industry, i.e. slaughterhouse wastewater treatment and goat milk pasteurisation. The obtained results, insoluble residue rejections (100%) and high bacterial removal (87–99%), make the ceramic CM suitable for microfiltration processes. |
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| Keywords: | A. Sintering Aluminosilicates Ceramic membranes Composite materials Microfiltration |
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