TY - JOUR
T1 - Optimization of novel composite membranes for water and mineral recovery by vacuum membrane distillation
AU - Cui, Zhaoliang
AU - Zhang, Yongxing
AU - Li, Xue
AU - Wang, Xiaozu
AU - Drioli, Enrico
AU - Wang, Zhaohui
AU - Zhao, Shuaifei
PY - 2018/8/15
Y1 - 2018/8/15
N2 - In mining industries, the process combining ultrafiltration (UF) and reverse osmosis (RO) is often used for wastewater treatment, but RO brine discharge is a big issue. Membrane distillation (MD) has been proposed to solve this problem by significantly increasing the water recovery ratio, and recovering minerals. However, membranes with high hydrophobicity targeting for MD, particularly for vacuum membrane distillation (VMD) are still scarce. Hyflon AD is a novel candidate for fabricating membranes for MD. In this paper, the effects of membrane fabrication parameters, such as coating time, heat treatment and pre-filling were investigated and optimized. Membrane morphology, mechanical properties and VMD performance of the composite membranes were tested. The results showed that the hydrophobicity and elongation at break of the membrane were significantly improved after coating. The coating polymer concentration, coating time, heat treatment temperature and heat treatment time for the membrane coated by Hyflon AD40L and Hyflon AD40H, respectively were optimized. Monovalent alcohols can be excellent pre-filling agents to improve membrane performance. Separation performance of the membrane coated by Hyflon AD40H was better than that of the one coated by Hyflon AD40L.
AB - In mining industries, the process combining ultrafiltration (UF) and reverse osmosis (RO) is often used for wastewater treatment, but RO brine discharge is a big issue. Membrane distillation (MD) has been proposed to solve this problem by significantly increasing the water recovery ratio, and recovering minerals. However, membranes with high hydrophobicity targeting for MD, particularly for vacuum membrane distillation (VMD) are still scarce. Hyflon AD is a novel candidate for fabricating membranes for MD. In this paper, the effects of membrane fabrication parameters, such as coating time, heat treatment and pre-filling were investigated and optimized. Membrane morphology, mechanical properties and VMD performance of the composite membranes were tested. The results showed that the hydrophobicity and elongation at break of the membrane were significantly improved after coating. The coating polymer concentration, coating time, heat treatment temperature and heat treatment time for the membrane coated by Hyflon AD40L and Hyflon AD40H, respectively were optimized. Monovalent alcohols can be excellent pre-filling agents to improve membrane performance. Separation performance of the membrane coated by Hyflon AD40H was better than that of the one coated by Hyflon AD40L.
KW - Hyflon AD
KW - Membrane coating
KW - Membrane distillation
KW - Poly(vinylidene fluoride) membrane
KW - Vacuum membrane distillation
UR - http://www.scopus.com/inward/record.url?scp=85037045510&partnerID=8YFLogxK
U2 - 10.1016/j.desal.2017.11.040
DO - 10.1016/j.desal.2017.11.040
M3 - Article
AN - SCOPUS:85037045510
SN - 0011-9164
VL - 440
SP - 39
EP - 47
JO - Desalination
JF - Desalination
ER -