DBPapers
DOI: 10.5593/SGEM2016/B31/S12.007

ADVANCES IN MEMBRANES TECHNOLOGY FOR GAS SEPARATION AND WASTEWATER TREATMENT

V. Niculescu, M.Miricioiu, R. Zgavarogea, N. Paun
Wednesday 7 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-61-2 / ISSN 1314-2704, June 28 - July 6, 2016, Book3 Vol. 1, 47-54 pp

ABSTRACT
The rapid development of membrane processes in recent years is due to the drive toward greater economic and environmental efficient separation processes. The use of membranes for separation and wastewater treatment has resulted from the progress made in membrane materials, membrane structure, and large-scale membrane production methods. In order to be useful for separation or purification processes, membranes must exhibit a number of characteristics such as high flux, high selectivity, mechanical stability, resistance to fouling, and low cost. The most commonly used membranes are polymeric and nonporous, the separation being based on a solution–diffusion mechanism involving molecular-scale interactions of the permeating molecule with the membrane polymer. Inorganic membranes, (molecular sieving zeolite membranes carbon membranes, alumina membranes, and silica membranes) have high thermal and chemical stabilities. Over the past years, extensive work has been reported on the synthesis, characterization, and application of inorganic membranes.
Despite all the advantages, polymeric membranes cannot overcome the polymer upper-bound limit between permeability and selectivity. It is desirable to provide an alternate cost-effective membrane in a position above the trade-off curves between permeability and selectivity.
Based on the need of a more efficient membrane than polymer and inorganic membranes, a new type of membranes, mixed-matrix membranes, has been developed recently. Mixed-matrix membranes are hybrid membranes containing solid, liquid, or both solid and liquid fillers embedded in a polymer matrix.
This study reviews several key advances in the design, preparation, and applications of mixed-matrix membranes presented in the literature. The strategy for the development of mixed-matrix membranes is to combine the advanced features of polymer membrane and inorganic membrane into one composite membrane. Although technical progress has been reported, no commercial mixed-matrix membrane application is found. The lack of commercial mixed-matrix membranes could be due to current insufficient information in membrane processability, stability, and cost.

Keywords: gas separation, membrane, wastewater