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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Unraveling flux behavior of superhydrophilic loose nanofiltration membranes during textile wastewater treatment
Journal of Membrane Science, Volume 493, Year 2015
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Description
Loose nanofiltration (NF) membranes can be used to treat textile wastewater effectively, providing an attracted avenue for resource recovery (i.e., dye purification and salt reuse) at the premise of the integration of high dye retention and salt permeation. However, the issue of membrane fouling has to be adequately addressed in view of its practical application. In this study, superhydrophilic loose NF membranes (Sepro NF 6 and NF 2A, Ultura) were applied for textile wastewater treatment. Synthetic solutions containing dyes and NaCl were used as the feed stream of a NF unit. It was found that two factors, namely cake-enhanced concentration polarization and the formation of a dye cake layer, dramatically deteriorated the flux of NF membranes with a synergic effect. In viewpoint of realistic application, diafiltration of a binary dye/salt mixture indicates that cake-enhanced concentration polarization plays a dominant role for the low membrane flux. As the diafiltration continued, cake-enhanced concentration polarization was alleviated with a decreasing concentration of salt in the feed. At the subsequent post-concentration procedure, the formation of a dye cake layer slightly compromised the membrane flux, but the negative impact of cake-enhanced concentration polarization was negligible due to the small quantity of salt remained in the feed. © 2015 Elsevier B.V.
Authors & Co-Authors
Lin, Jiuyang
Belgium, Leuven
Ku Leuven
Sun, Shi Peng
China, Nanjing
Nanjing Tech University
Volodin, Alexander P.
Belgium, Leuven
Ku Leuven
Sotto, A.
Spain, Madrid
Universidad Rey Juan Carlos
Luis, Patricia
Belgium, Louvain-la-neuve
Université Catholique de Louvain
van der Bruggen, Bart
Belgium, Leuven
Ku Leuven
Statistics
Citations: 202
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.1016/j.memsci.2015.07.018
ISSN:
03767388