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.

Fabrication of a superhydrophobic poly(vinylidene fluoride) hollow fibre membrane by spray deposition

2018 ◽  
Vol 13 (2) ◽  
pp. 223-227 ◽  
Author(s):  
Pengrui Jin ◽  
Chuan Huang ◽  
Yifu Li ◽  
Jiaxiang Li ◽  
Liao Wang
Keyword(s):  
Vinylidene Fluoride ◽  
Spray Deposition ◽  
Hollow Fibre ◽  
Hollow Fibre Membrane ◽  
Fibre Membrane ◽  
Poly Vinylidene Fluoride

scholarly journals Demonstrating Commercial Hollow Fibre Membrane Contactor Performance at Industrial Scale for Biogas Upgrading at a Sewage Treatment Works

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 172
Author(s):  
Sam Houlker ◽  
Tony Rutherford ◽  
Daniel Herron ◽  
Adam Brookes ◽  
Andrew Moore ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Membrane Integrity ◽  
Hollow Fibre ◽  
Co2 Separation ◽  
Co2 Absorption ◽  
Membrane Contactor ◽  
Hollow Fibre Membrane ◽  
Fibre Membrane ◽  
Synthetic Gas ◽  
Pre Treatment

Hollow fibre membrane contactor (HFMC) technology has been developed for CO2 absorption primarily using synthetic gas, which neglects the critical impact that trace contaminants might have on separation efficiency and robustness in industrial gases. This study, therefore, commissioned a demonstration-scale HFMC for CO2 separation at a full-scale anaerobic digester facility to evaluate membrane integrity over six months of operation on real biogas. The CO2 capture efficiency identified using real biogas was benchmarked at comparable conditions on synthetic gas of an equivalent partial pressure, and an equivalent performance identified. Two HFMC were subsequently compared, one with and one without a pre-treatment stage that targeted particulates, volatile organic compounds (VOCs) and humidity. Similar CO2 separation efficiency was again demonstrated, indicating limited impact within the timescale evaluated. However, gas phase pre-treatment is advised in order to ensure robustness in the long term. Over longer-term operation, a decline in CO2 separation efficiency was observed. Membrane autopsy identified shell-side deposition, where the structural morphology and confirmation of amide I and II groups, indicated biofouling. Separation efficiency was reinstated via chemical cleaning, which demonstrated that proactive maintenance could minimise process risk.

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.

Sign in / Sign up

Export Citation Format

Share Document