TY - JOUR
T1 - Enhanced anti-wetted PVDF membrane for pulping RO brine treatment by vacuum membrane distillation
AU - Pan, Jun
AU - Chen, Min
AU - Xu, Xianli
AU - Sun, Shi Peng
AU - Wang, Zhaohui
AU - Cui, Zhaoliang
AU - Xing, Weihong
AU - Tavajohi, Naser
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/3/15
Y1 - 2022/3/15
N2 - Large amounts of lignin, hemicellulose, organic matter and inorganic salts are present in pulping and papermaking wastewater. Therefore, the treatment and discharge of pulping wastewater are important issues. We have designed and developed the world's first zero liquid discharge (ZLD) system for it based on pretreatment-membrane-evaporative crystallization integrated technologies. However, for the treatment of high salt reverse osmosis (RO) brine, there are still challenges that need to be addressed. In this work, the feasibility of using a membrane distillation crystallization (MDC) process to treat high saline RO brine was investigated. Two different coating materials, Hyflon AD 40H and perfluoropolyether (PFPE), were applied to improve the membrane surface hydrophobicity for stable and efficient performance. After modification, the water contact angle was up to 138.4o and 157.7o for Hyflon/polyvinylidene fluoride (PVDF) and PFPE/PVDF composite membranes, respectively. Moreover, the PFPE/PVDF membrane showed a higher repellency toward RO brine, which is better for the following MDC treatment. During the MDC progress using composite PFPE/PVDF membranes, the salt crystals precipitated and gradually accumulated. More importantly, the final NaCl purity can be up to 94%. Therefore, it is hopeful to improve of the existing ZLD system by MDC operation.
AB - Large amounts of lignin, hemicellulose, organic matter and inorganic salts are present in pulping and papermaking wastewater. Therefore, the treatment and discharge of pulping wastewater are important issues. We have designed and developed the world's first zero liquid discharge (ZLD) system for it based on pretreatment-membrane-evaporative crystallization integrated technologies. However, for the treatment of high salt reverse osmosis (RO) brine, there are still challenges that need to be addressed. In this work, the feasibility of using a membrane distillation crystallization (MDC) process to treat high saline RO brine was investigated. Two different coating materials, Hyflon AD 40H and perfluoropolyether (PFPE), were applied to improve the membrane surface hydrophobicity for stable and efficient performance. After modification, the water contact angle was up to 138.4o and 157.7o for Hyflon/polyvinylidene fluoride (PVDF) and PFPE/PVDF composite membranes, respectively. Moreover, the PFPE/PVDF membrane showed a higher repellency toward RO brine, which is better for the following MDC treatment. During the MDC progress using composite PFPE/PVDF membranes, the salt crystals precipitated and gradually accumulated. More importantly, the final NaCl purity can be up to 94%. Therefore, it is hopeful to improve of the existing ZLD system by MDC operation.
KW - Composite membrane
KW - Hydrophobic membrane
KW - Membrane distillation crystallization
KW - RO brine
KW - Zero liquid discharge
UR - http://www.scopus.com/inward/record.url?scp=85123275557&partnerID=8YFLogxK
U2 - 10.1016/j.desal.2021.115533
DO - 10.1016/j.desal.2021.115533
M3 - 文章
AN - SCOPUS:85123275557
SN - 0011-9164
VL - 526
JO - Desalination
JF - Desalination
M1 - 115533
ER -