Negative Pressure Membrane Distillation for Excellent Gypsum Scaling Resistance and Flux Enhancement

2021 ◽  
Author(s):  
Yongjie Liu ◽  
Thomas Horseman ◽  
Zhangxin Wang ◽  
Hassan A. Arafat ◽  
Huabing Yin ◽  
...  
Keyword(s):  
Negative Pressure ◽  
Membrane Distillation ◽  
Flux Enhancement ◽  
Gypsum Scaling ◽  
Scaling Resistance

scholarly journals Distillate Flux Enhancement of Direct Contact Membrane Distillation Modules with Inserting Cross-Diagonal Carbon-Fiber Spacers

Membranes ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 973
Author(s):  
Chii-Dong Ho ◽  
Luke Chen ◽  
Jun-Wei Lim ◽  
Po-Hung Lin ◽  
Pin-Tsen Lu
Keyword(s):  
Carbon Fiber ◽  
Direct Contact ◽  
Pure Water ◽  
Water Productivity ◽  
Membrane Distillation ◽  
Design Parameters ◽  
Countercurrent Flow ◽  
Flux Enhancement ◽  
Direct Contact Membrane Distillation ◽  
Theoretical Predictions

A new design of direct-contact membrane distillation (DCMD) modules with cross-diagonal carbon-fiber spacers of various hydrodynamic angles in flow channels to promote turbulence intensity was proposed to enhance pure water productivity. Attempts to reduce the temperature polarization coefficient were achieved by inserting cross-diagonal carbon-fiber spacers in channels, which create wakes and eddies in both heat and mass transfer behaviors to enhance the permeate flux enhancement. A simplified equation was formulated to obtain the theoretical predictions of heat transfer coefficients in the current DCMD device. The permeate fluxes and temperature distributions of both hot and cold feed streams are represented graphically with the inlet volumetric flow rate and inlet temperature of the hot saline feed stream as parameters. The higher distillate flux of countercurrent-flow operations for saline water desalination was accomplished as compared to the concurrent-flow operations of various hydrodynamic angles. The results show that the agreement between the theoretical predictions and experimental results is reasonably good. The effects of countercurrent-flow operations and inserting carbon fiber spacers have confirmed technical feasibility and device performance enhancement of up to 45%. The influences of operating and design parameters on the pure water productivity with the expense of energy consumption are also discussed.

Scaling resistance by fluoro-treatments: The importance of wetting states

2022 ◽  
Author(s):  
Li Liu ◽  
Laura Charlton ◽  
Yanqing Song ◽  
Tao Li ◽  
Xue-Mei Li ◽  
...  
Keyword(s):  
High Salinity ◽  
Membrane Distillation ◽  
Separation Process ◽  
Porous Membranes ◽  
Thermally Driven ◽  
Scaling Resistance

Membrane distillation is a thermally driven separation process using hydrophobic, porous membranes. Among various problems faced by membrane distillation, scaling remains an unresolved challenge in treating streams of high salinity....

Distillate flux enhancement in the air gap membrane distillation with inserting carbon-fiber spacers

2017 ◽  
Vol 52 (18) ◽  
pp. 2817-2828 ◽  
Author(s):  
Chii-Dong Ho ◽  
Luke Chen ◽  
Mei-Chih Huang ◽  
Jing-Yuan Lai ◽  
Yu-An Chen
Keyword(s):  
Carbon Fiber ◽  
Membrane Distillation ◽  
Air Gap ◽  
Flux Enhancement ◽  
Air Gap Membrane Distillation

scholarly journals Material gap membrane distillation: A new design for water vapor flux enhancement

2013 ◽  
Vol 448 ◽  
pp. 240-247 ◽  
Author(s):  
Lijo Francis ◽  
Noreddine Ghaffour ◽  
Ahmad A. Alsaadi ◽  
Gary L. Amy
Keyword(s):  
Water Vapor ◽  
Membrane Distillation ◽  
Water Vapor Flux ◽  
Vapor Flux ◽  
Flux Enhancement

scholarly journals Effect of on the Membrane Distillation of PVDF Membrane Material Enhanced by Gas-Liquid Two-Phase Flow

2018 ◽  
Vol 2 (1) ◽  
Keyword(s):  
Membrane Surface ◽  
Threshold Level ◽  
Membrane Distillation ◽  
Permeate Flux ◽  
High Concentration ◽  
Two Phase ◽  
Flux Enhancement ◽  
Membrane Performance ◽  
Flux Decline ◽  
Sweeping Gas

This study investigates the membrane performance and fouling control in the bubble-assisted sweeping gas membrane distillation with high concentration saline (333 K saturated solution) as feed. The results show that longer bubbling interval (3 min) at a fixed bubbling duration of 30s can most efficiently increase the the flux enhancement ratio up to 1.518. Next, the flux increases with the gas flowrate under a relatively lower level, but tends to a plateau after the threshold level (1.2 L•min-1). Compared to non-bubbling case, the permeate flux reaches up to 1.623 fold at a higher bubble relative humidity of 80 %. It was also found that greater flux enhancement can be achieved and meanwhile dramatic flux decline can be delayed for an intermittent bubbling system with a smaller nozzle size. These results accord well with the observations of fouling deposition in situ on the membrane surface with SEM.

Gypsum scaling in membrane distillation: Impacts of temperature and vapor flux

Desalination ◽  
2022 ◽  
Vol 525 ◽  
pp. 115499
Author(s):  
Kofi S.S. Christie ◽  
Thomas Horseman ◽  
Ruoyu Wang ◽  
Chunlei Su ◽  
Tiezheng Tong ◽  
...  
Keyword(s):  
Membrane Distillation ◽  
Vapor Flux ◽  
Gypsum Scaling
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