Membrane cleaning and pretreatments in membrane distillation - a review

2021 ◽  
pp. 129696
Author(s):  
Ahmed Abdel-Karim ◽  
Sebastian Leaper ◽  
Clara Skuse ◽  
Guillermo Zaragoza ◽  
Marek Gryta ◽  
...  
Keyword(s):  
Membrane Distillation ◽  
Membrane Cleaning

scholarly journals Demonstration of membrane distillation on textile waste water: assessment of long term performance, membrane cleaning and waste heat integration

2017 ◽  
Vol 3 (3) ◽  
pp. 433-449 ◽  
Author(s):  
Noel Dow ◽  
Jesús Villalobos García ◽  
Leslie Niadoo ◽  
Nicholas Milne ◽  
Jianhua Zhang ◽  
...  
Keyword(s):  
Textile Industry ◽  
Waste Heat ◽  
Membrane Distillation ◽  
Heat Integration ◽  
Membrane Cleaning ◽  
Long Term Performance ◽  
Term Performance ◽  
Textile Waste Water ◽  
Water Assessment

A three month membrane distillation trial demonstrated innovative pretreatments, cleaning and waste heat integration as an inland textile industry wastewater solution.

scholarly journals Membrane cleaning in membrane distillation of reverse osmosis concentrate generated in landfill leachate treatment

2021 ◽  
Author(s):  
Xiaolin Jia ◽  
Kuiling Li ◽  
Baoqiang Wang ◽  
ZhiChao Zhao ◽  
Deyin Hou ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Landfill Leachate ◽  
Membrane Fouling ◽  
Membrane Distillation ◽  
Water Recovery ◽  
Permeate Flux ◽  
Chemical Cleaning ◽  
Leachate Treatment ◽  
Membrane Cleaning ◽  
Cleaning Methods

Abstract As a thermally induced membrane separation process, membrane distillation (MD) has drawn more and more attention for the advantages of treating hypersaline wastewaters, especially the concentrate from reverse osmosis (RO) process. One of the major obstacles in widespread MD application is the membrane fouling. We investigated the feasibility of direct contact membrane distillation (DCMD) for landfill leachate reverse osmosis concentrate (LFLRO) brine treatment and systematically assessed the efficiency of chemical cleaning for DCMD after processing LFLRO brine. The results showed that 80% water recovery rate was achieved when processing the LFLRO brine by DCMD, but the membrane fouling occurred during the DCMD process, and manifested as the decreasing of permeate flux and the increasing of permeate conductivity. Analysis revealed that the serious flux reduction was primarily caused by the fouling layer that consist of organic matters and inorganic salts. Five cleaning methods were investigated for membrane cleaning, including hydrogen chloride (HCl)-sodium hydroxide (NaOH), ethylene diamine tetraacetic acid (EDTA)-NaOH, critic acid, sodium hypochlorite (NaClO) and sodium dodecyl sulphate (SDS) cleaning. Among the chemical cleaning methods investigated, the 3 wt.% SDS cleaning showed the best efficiency at recovering the performance of fouled membranes.

scholarly journals Seawater desalination using air gap membrane distillation-an experimental study on membrane scaling and cleaning

2017 ◽  
Vol 55 (3) ◽  
pp. 285
Author(s):  
Hung Cong Duong ◽  
Son Trung Luong ◽  
Thao Manh Pham ◽  
Nguyen Thai Huynh
Keyword(s):  
Fresh Water ◽  
Water Flux ◽  
Membrane Distillation ◽  
Air Gap ◽  
Small Scale ◽  
Seawater Desalination ◽  
Membrane Cleaning ◽  
Air Gap Membrane Distillation ◽  
Membrane Scaling ◽  
Operating Temperatures

The connection between operating temperature and membrane scaling/cleaning during an air gap membrane distillation (AGMD) process of seawater has been systematically elucidated in this study. Experimental and mathematically simulated data demonstrate the profound influences of feed salinity and membrane scaling on water flux at various operating temperatures. Feed salinity exerted significant impacts on water flux at high operating temperatures because of aggravated polarization effects. Membrane scaling and the subsequent membrane cleaning efficiency were also strongly affected by operating temperatures. Indeed, membrane scaling was more severe and occurred at a lower water recovery when operating at 60-50 °C (feed-coolant temperature) compared to that at 35-25 °C. Moreover, membrane cleaning with fresh water and vinegar was less effective for the membrane scaled at 60-50 °C compared to 35-25 °C. Finally, membrane cleaning using vinegar was much more efficient than fresh water. Given the availability of vinegar at household level, vinegar cleaning can potentially be a low cost and readily accessible approach for MD maintenance for small scale seawater desalination applications in remote coastal communities.

scholarly journals Mitigation of Membrane Wetting by Applying a Low Temperature Membrane Distillation

Membranes ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 158 ◽  
Author(s):  
Marek Gryta
Keyword(s):  
Sea Water ◽  
Membrane Surface ◽  
Membrane Distillation ◽  
Water Desalination ◽  
Salt Crystallization ◽  
Membrane Cleaning ◽  
Membrane Wetting ◽  
Feed Temperature ◽  
Long Term Studies

The formation of deposits on the membrane surface during membrane distillation is considered as one of the main reasons for membrane wetting. To assess the intensity of this phenomenon, long-term studies were performed comparing the membrane wettability with non-fouling feed (NaCl solutions) and feeds containing various foulants (lake and Baltic Sea water). The polypropylene membranes used were non-wetted by NaCl solutions during several hundred hours of water desalination. However, the occurrence of CaCO3 or other salt crystallization caused the membranes to be partially wetted, especially when periodical membrane cleaning was applied. The scaling intensity was significantly reduced by lowering the feed temperature from 353 to 315 K, which additionally resulted in the limitation of the degree of membrane wetting.

Effect of the membrane potential on the performance of ultrafiltration membranes

1986 ◽  
Vol 51 (3) ◽  
pp. 539-544 ◽  
Author(s):  
Hans-Hartmut Schwarz ◽  
Vlastimil Kůdela ◽  
Jaromír Lukáš ◽  
Jiří Vacík ◽  
Volker Gröbe
Keyword(s):  
Membrane Potential ◽  
Concentration Polarization ◽  
Ultrafiltration Membranes ◽  
Membrane Cleaning ◽  
Gel Layer ◽  
Charged Membrane ◽  
Protein Molecules ◽  
Polysulfone Membranes ◽  
Pressure Driven

In the pressure driven process the performance of membranes for ultrafiltration can be changed by incorporating charged groups into the membranes. sulfonation of polysulfone membranes the membrane potential is varied. On interaction of the negatively charged membrane with positively or negatively charged protein molecules the formation of a concentration polarization gel layer proceeds at different rate. Thus, the performance of the membrane can be controlled by the membrane potential. The dependence of the performance on the potential is discussed and procedures for membrane cleaning are suggested.

scholarly journals Triple-Layer Nanocomposite Membrane Prepared by Electrospinning Based on Modified PES with Carbon Nanotubes for Membrane Distillation Applications

Membranes ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 15 ◽  
Author(s):  
Mohamed R. Elmarghany ◽  
Ahmed H. El-Shazly ◽  
Saeid Rajabzadeh ◽  
Mohamed S. Salem ◽  
Mahmoud A. Shouman ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Vinylidene Fluoride ◽  
Bulk Material ◽  
Total Porosity ◽  
Surface Hydrophobicity ◽  
Membrane Distillation ◽  
Nanocomposite Membrane ◽  
High Porosity ◽  
Triple Layer ◽  
Layer Membrane

In this work, a novel triple-layer nanocomposite membrane prepared with polyethersulfone (PES)/carbon nanotubes (CNTs) as the primary bulk material and poly (vinylidene fluoride-co-hexafluoro propylene) (PcH)/CNTs as the outer and inner surfaces of the membrane by using electrospinning method is introduced. Modified PES with CNTs was chosen as the bulk material of the triple-layer membrane to obtain a high porosity membrane. Both the upper and lower surfaces of the triple-layer membrane were coated with PcH/CNTs using electrospinning to get a triple-layer membrane with high total porosity and noticeable surface hydrophobicity. Combining both characteristics, next to an acceptable bulk hydrophobicity, resulted in a compelling membrane for membrane distillation (MD) applications. The prepared membrane was utilized in a direct contact MD system, and its performance was evaluated in different salt solution concentrations, feed velocities and feed solution temperatures. The results of the prepared membrane in this study were compared to those reported in previously published papers. Based on the evaluated membrane performance, the triple-layer nanocomposite membrane can be considered as a potential alternative with reasonable cost, relative to other MD membranes.

Anti-oil-fouling hydrophobic-superoleophobic composite membranes for robust membrane distillation performance

2019 ◽  
Vol 696 ◽  
pp. 133883 ◽  
Author(s):  
Min Tang ◽  
Deyin Hou ◽  
Chunli Ding ◽  
Kunpeng Wang ◽  
Dewu Wang ◽  
...  
Keyword(s):  
Composite Membranes ◽  
Membrane Distillation ◽  
Oil Fouling

scholarly journals Membrane Distillation Provides a Dual Barrier for Coronavirus and Bacteriophage Removal

2021 ◽  
Author(s):  
Mukta Hardikar ◽  
Luisa A. Ikner ◽  
Varinia Felix ◽  
Luke K. Presson ◽  
Andrew B. Rabe ◽  
...  
Keyword(s):  
Membrane Distillation
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