TY - JOUR
T1 - Unraveling flux behavior of superhydrophilic loose nanofiltration membranes during textile wastewater treatment
AU - Lin, Jiuyang
AU - Tang, Chuyang Y.
AU - Ye, Wenyuan
AU - Sun, Shi Peng
AU - Hamdan, Shadi H.
AU - Volodin, Alexander
AU - Haesendonck, Chris Van
AU - Sotto, Arcadio
AU - Luis, Patricia
AU - Van der Bruggen, Bart
N1 - Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/11/1
Y1 - 2015/11/1
N2 - 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.
AB - 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.
KW - Cake-enhanced concentration polarization
KW - Dye/salt binary mixture
KW - Flux decline
KW - Fouling and cleaning
KW - Superhydrophilic loose NF membranes
UR - http://www.scopus.com/inward/record.url?scp=84938089218&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2015.07.018
DO - 10.1016/j.memsci.2015.07.018
M3 - 文章
AN - SCOPUS:84938089218
SN - 0376-7388
VL - 493
SP - 690
EP - 702
JO - Journal of Membrane Science
JF - Journal of Membrane Science
ER -