High flux ultrafiltration membrane for drinking water production

2001 ◽  
Vol 1 (5-6) ◽  
pp. 177-184 ◽  
Author(s):  
S. Nakatsuka ◽  
T. Ase ◽  
T. Miyano
Keyword(s):  
Drinking Water ◽  
Hollow Fibre ◽  
Asymmetric Structure ◽  
Dense Layer ◽  
High Flux ◽  
Water Production ◽  
Hollow Fibre Membrane ◽  
Fibre Membrane ◽  
Drinking Water Production

The high flux ultrafiltration hollow fibre membrane (HFCA) for drinking water production was developed and the membrane performance was evaluated by long-term ultrafiltration testing with river water. The hollow fibre membrane was made of cellulose acetate (CA) and has a highly porous structure with a very thin dense layer on the internal surface of the membrane. The ultrafiltration flux of the HFCA membrane was compared with that of the conventional CA membrane without such a highly asymmetric structure. The flux for the HFCA membrane was almost twice as high as that for the conventional one. The performance of the conventional CA membrane was also compared with that of membranes with different materials, namely polyethersulfone (PES) and polyacrylonitrile (PAN). The result showed much higher flux for the CA membrane, indicating that the fouling can be effectively controlled by using the membrane with hydrophilic and negatively charged properties. It was shown that the high flux for the HFCA membrane was due to characteristics of both membrane material and porous membrane structure. The pilot plant testing was carried out to examine the performance in the long term operation, and confirmed the high performance of the HFCA membrane for the application of drinking water treatment.

scholarly journals Surface modification of poly(vinylidene fluoride) hollow fibre membranes for biogas purification in a gas–liquid membrane contactor system

2017 ◽  
Vol 4 (11) ◽  
pp. 171321 ◽  
Author(s):  
Pengrui Jin ◽  
Chuan Huang ◽  
Jiaxiang Li ◽  
Yadong Shen ◽  
Liao Wang
Keyword(s):  
Vinylidene Fluoride ◽  
Spray Deposition ◽  
Hollow Fibre ◽  
Membrane Contactor ◽  
Pvdf Membrane ◽  
Hollow Fibre Membrane ◽  
Long Term Stability ◽  
Fibre Membrane ◽  
Poly Vinylidene Fluoride

The wetting of hollow fibre membranes decreases the performance of the liquid–gas membrane contactor for CO 2 capture in biogas upgrading. To solve this problem, in this work, a poly(vinylidene fluoride) (PVDF) hollow fibre membrane for a liquid–gas membrane contactor was coated with a superhydrophobic layer composed of a combination of hydrophobic SiO 2 nanoparticles and polydimethylsiloxane (PDMS) by the method of spray deposition. A rough layer of SiO 2 deposited on the PVDF membrane resulted in an enhanced surface hydrophobicity. The surface structure of the pristine PVDF significantly affected the homogeneity of the generated SiO 2 layer. A uniform surface coating on the PVDF upper layer resulted from the presence of micrometre and nanometre-sized roughness on the surface of the PVDF membrane, which was achieved with a SiO 2 concentration of 4.44 mg ml −1 (0.2 g/45 ml) in the coating solution. As a result, the water contact angle of the modified surface was recorded as 155 ± 3°, which is higher than that of the pristine surface. The high contact angle is advantageous for reducing the wetting of the membrane. Additional mass transfer resistance was introduced by the superhydrophobic layer. In addition, continuous CO 2 absorption tests were carried out in original and modified PVDF hollow fibre membrane contactors, using monoethanolamine (MEA) solution as the absorbent. A long-term stability test revealed that the modified PVDF hollow fibre membrane contactor was able to outperform the original membrane contactor and demonstrated outstanding long-term stability, suggesting that spray deposition is a promising approach to obtain superhydrophobic PVDF membranes for liquid–gas membrane absorption.

Neural networks for long term prediction of fouling and backwash efficiency in ultrafiltration for drinking water production

Desalination ◽  
2000 ◽  
Vol 131 (1-3) ◽  
pp. 353-362 ◽  
Author(s):  
N. Delgrange-Vincent ◽  
C. Cabassud ◽  
M. Cabassud ◽  
L. Durand-Bourlier ◽  
J.M. Laîné
Keyword(s):  
Neural Networks ◽  
Drinking Water ◽  
Water Production ◽  
Term Prediction ◽  
Drinking Water Production ◽  
Long Term Prediction

Climate change and drinking water production in The Netherlands: a flexible approach

2005 ◽  
Vol 51 (5) ◽  
pp. 37-44 ◽  
Author(s):  
T.A.B. Ramaker ◽  
A.F.M. Meuleman ◽  
L. Bernhardi ◽  
G. Cirkel
Keyword(s):  
Climate Change ◽  
Drinking Water ◽  
The Netherlands ◽  
Salt Water ◽  
Water System ◽  
Water Systems ◽  
Salt Water Intrusion ◽  
Water Production ◽  
Drinking Water Production

Climate change increases water system dynamics through temperature changes, changes in precipitation patterns, evaporation, water quality and water storage in ice packs. Water system dependent economical stakeholders, such as drinking water companies in The Netherlands, have to cope with consequences of climate change, e.g. floods and water shortages in river systems, upconing brackish ground water, salt water intrusion, increasing peak demands and microbiological activity. In the past decades, however, both water systems and drinking water production have become more and more inflexible; water systems have been heavily regulated and the drinking water supply has grown into an inflexible, but cheap and reliable, system. Flexibility and adaptivity are solutions to overcome climate change related consequences. Flexible adaptive strategies for drinking water production comprise new sources for drinking water production, application of storage concepts in the short term, and a redesign of large centralised systems, including flexible treatment plants, in the long term. Transition to flexible concepts will take decades because investment depreciation periods of assets are long. This implies that long-term strategies within an indicated time path have to be developed. These strategies must be based on thorough knowledge of current assets to seize opportunities for change.

Preparation and characterization of a high flux nanofiltration polyamide hollow fiber TFC membrane for drinking water production

2020 ◽  
Vol 193 ◽  
pp. 177-188
Author(s):  
Wan Su ◽  
Yufeng Zhang ◽  
Wenjuan Zhang ◽  
Shuting Xie ◽  
Xiaobo Sun ◽  
...  
Keyword(s):  
Drinking Water ◽  
Hollow Fiber ◽  
High Flux ◽  
Water Production ◽  
Drinking Water Production ◽  
Tfc Membrane

scholarly journals Effect of Sintering Temperature on the Fabrication of Ceramic Hollow Fibre Membrane

2016 ◽  
Vol 15 (2) ◽  
pp. 1
Author(s):  
Syafikah H Paiman ◽  
Mukhlis A A Rahman ◽  
Mohd Hafiz Dzarfan Othman ◽  
Siti Halimah Ahmad
Keyword(s):  
Mechanical Strength ◽  
Ceramic Membrane ◽  
Sintering Temperature ◽  
Pure Water ◽  
Water Flux ◽  
Hollow Fibre ◽  
Polymeric Membrane ◽  
Asymmetric Structure ◽  
Hollow Fibre Membrane ◽  
Fibre Membrane

Recently, ceramic membrane gradually acquired attention from researchers due to the advantages of ceramic’s behavior, which allows the ceramic to overcome the limitations of using polymeric membrane. This work focused on the fabrication of ceramic hollow fibre membrane from a ceramic suspension solution containing yttria-stabilized zirconia (YSZ), polyethersulfone (PESf), N-methylpyrrolidone (NMP) and dispersants using combined phase inversion sintering technique. In this study, ceramic hollow membrane precursors were sintered at different sintering temperature ranging between 1250°C and 1400°C. The influences of sintering temperature on the microstructure, porosity and pore size distribution, mechanical strength and pure water flux of ceramic hollow fibre membrane were investigated in detail. The results show an asymmetric structure of YSZ hollow fibre membrane containing finger-like structure and sponge-like structure. The sponge-like structure can serve as a separation layer, while finger-like-structure performs as a supported layer. It is observed that sintering process caused a significant densification of sponge-like structure (microstructure). Sintering at temperature 1400°C shows the formation of non- interconnected voids. Sintering at 1300°C is sufficient enough having a mechanical strength of 227.55MPa with an apparent porosity of 45.09% and PWF of 118.39L.m¯².hr¯¹.

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