Green ceramic membranes. From countryside to efficient industrial performance

Reference Presenter Authors
13-012 Enrique Sánchez Sánchez, E.(University Jaume I); Lorente, M.(University Jaume I); Bordes, M.(University Jaume I); Zuriaga, E.(Sociedad de Fomento Agrícola Castellonense); The manufacture of low-cost ecological ceramic membranes from wastes can turn into a feasible alternative to enhance the use of ceramic membranes in many industrial applications. In this work, a composition methodology for making ceramic membranes from agricultural wastes as pore formers and other inorganic industrial wastes is presented. The ceramic membranes comprising a porous support and a selective layer were manufactured by conventional technologies such as extrusion and dip-coating (or immersion) respectively. The effect of the amount and particle size of the organic wastes in the composition as well as of the sintering cycle on membrane microstructure and functionality were examined. Membrane characterisation was based on porosity, microstructure, mechanical strength and water permeability.  
Overall, results showed suitable extruding performance for the compositions regardless the organic pore former used. Furthermore, it was observed that the lower the particle size of the organic pore former is, the lower the open porosity and, consequently, the water permeability will be. Concerning the sintering process, findings indicated that an increase in temperature causes a rise in linear shrinkage and, more significantly, in water permeability. Nevertheless, an undesirable reduction in open porosity is observed, owing to pore coarsening during the sintering process. Moreover, when the proportion of organic waste increases, the permeability and pore size also rises due to the increase in the amount of pore former in the composition, but the mechanical strength is impaired. Therefore, a balance between organic pore former characteristics and sintering parameters is necessary so that good performance ceramic membranes can be obtained. Finally, the role of the selective layer to adjust membrane filtering performance was also observed.  

This work has received funding from the EU Horizon 2020 programme (grant agreement No 641998).
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