Synergistic effect of air Sparging in Direct Contact Membrane Distillation to Control Membrane Fouling and Enhancing Flux

2021 ◽  
pp. 118681
Author(s):  
Mitun Chandra Bhoumick ◽  
Sagar Roy ◽  
Somenath Mitra
Keyword(s):  
Synergistic Effect ◽  
Membrane Fouling ◽  
Direct Contact ◽  
Membrane Distillation ◽  
Air Sparging ◽  
Direct Contact Membrane Distillation

scholarly journals Organic Fouling Impact in a Direct Contact Membrane Distillation System Treating Wastewater: Experimental Observations and Modeling Approach

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 493
Author(s):  
Amine Charfi ◽  
Fida Tibi ◽  
Jeonghwan Kim ◽  
Jin Hur ◽  
Jinwoo Cho
Keyword(s):  
Particle Size ◽  
Membrane Fouling ◽  
Direct Contact ◽  
Feed Solution ◽  
Membrane Distillation ◽  
Mixed Solution ◽  
Permeate Flux ◽  
Direct Contact Membrane Distillation ◽  
Organic Fouling ◽  
Specific Cake Resistance

This study aims to investigate the effect of operational conditions on organic fouling occurring in a direct contact membrane distillation (DCMD) system used to treat wastewater. A mixed solution of sodium alginate (SA) and bovine serum albumin (BSA) was used as a feed solution to simulate polysaccharides and proteins, respectively, assumed as the main organic foulants. The permeate flux was observed at two feed temperatures 35 and 50 °C, as well as three feed solution pH 4, 6, and 8. Higher permeate flux was observed for higher feed temperature, which allows higher vapor pressure. At higher pH, a smaller particle size was detected with lower permeate flux. A mathematical model based on mass balance was developed to simulate permeate flux with time by assuming (i) the cake formation controlled by attachment and detachment of foulant materials and (ii) the increase in specific cake resistance, the function of the cake porosity, as the main mechanisms controlling membrane fouling to investigate the fouling mechanism responsible of permeate flux decline. The model fitted well with the experimental data with R2 superior to 0.9. High specific cake resistance fostered by small particle size would be responsible for the low permeate flux observed at pH 8.

Influence of humic acid on the long-term performance of direct contact membrane distillation

2018 ◽  
Vol 30 (1) ◽  
pp. 109-120 ◽  
Author(s):  
Dong-Wan Cho ◽  
Gihoon Kwon ◽  
Jeongmin Han ◽  
Hocheol Song
Keyword(s):  
Humic Acid ◽  
Membrane Fouling ◽  
Coalbed Methane ◽  
Direct Contact ◽  
Membrane Surface ◽  
Membrane Distillation ◽  
Permeate Flux ◽  
Direct Contact Membrane Distillation ◽  
High Level

In this study, the influence of humic acid on the treatment of coalbed methane water by direct contact membrane distillation was examined with bench-scale test unit. During short-term distillation (1000 min), high level of humic acid above 50 ppm resulted in significant decrease in permeate flux, while low level of humic acid (∼2 ppm) had little influence on the flux. For the long-term distillation (5000 min), the flux decline began at 3400 min in the presence of 5 ppm humic acid and 5 mM Ca2+, and decreased to ∼40% of initial flux at 5000 min. The spectroscopic analysis of the membrane used revealed that the surface was covered by hydrophilic layers mainly composed of calcite. The membrane fouling effect of humic acid became more significant in the presence of Ca2+ due to more facile calcite formation on the membrane surface. It was demonstrated that humic acid enhanced CaCO3 deposition on the membrane surfaces, thereby expediting the scaling phenomenon.

Influence of Feed Composition on Distillate Flux and Membrane Fouling in Direct Contact Membrane Distillation

2010 ◽  
Vol 45 (7) ◽  
pp. 967-974 ◽  
Author(s):  
Tung-Wen Cheng ◽  
Chih-Jung Han ◽  
Kuo-Jen Hwang ◽  
Chii-Dong Ho ◽  
William J. Cooper
Keyword(s):  
Membrane Fouling ◽  
Direct Contact ◽  
Membrane Distillation ◽  
Feed Composition ◽  
Direct Contact Membrane Distillation

Concentrating primary reverse osmosis concentrate by direct contact membrane distillation

2010 ◽  
Vol 10 (3) ◽  
pp. 403-410 ◽  
Author(s):  
Dan Qu ◽  
Jun Wang ◽  
Deyin Hou ◽  
Zhaokun Luan ◽  
Baoqiang Wang
Keyword(s):  
Reverse Osmosis ◽  
Membrane Fouling ◽  
Direct Contact ◽  
Tap Water ◽  
Membrane Distillation ◽  
Feed Water ◽  
Membrane Process ◽  
Direct Contact Membrane Distillation ◽  
Thermally Driven ◽  
Module Efficiency

In the present work, a thermally driven membrane process-direct contact membrane distillation was investigated for concentrating the primary reverse osmosis concentrate to minimize the water loss. The primary reverse osmosis concentrate used in the work was obtained from the RO process of the direct drinking water preparation system designed for the 29th Olympic Games with 50% recovery. The feed water was Beijing tap water. Membrane fouling during the DCMD process was discussed, and acidification and accelerated precipitation softening was used as the pretreatment method to control the calcium scaling. Experimental results showed that acidification can alleviate and even eliminate CaCO3 scaling, but CaSO4 crystallization still occurred and led to a sharp decline of module efficiency. Accelerated precipitation softening enabled a high removal efficiency of Ca2 + , so both the CaCO3 and CaSO4 scaling was efficiently controlled. After proper pretreatment to control calcium scaling, the primary reverse osmosis concentrate could be concentrated 40 times and then the whole recovery was enhanced to 98.8%.

scholarly journals Enhanced Performance of Carbon Nanotube Immobilized Membrane for the Treatment of High Salinity Produced Water via Direct Contact Membrane Distillation

Membranes ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 325 ◽  
Author(s):  
Madihah Saud Humoud ◽  
Sagar Roy ◽  
Somenath Mitra
Keyword(s):  
Carbon Nanotube ◽  
Membrane Fouling ◽  
Direct Contact ◽  
Produced Water ◽  
High Salinity ◽  
Membrane Surface ◽  
Membrane Distillation ◽  
Vapor Flux ◽  
Ptfe Membrane ◽  
Direct Contact Membrane Distillation

Membrane distillation (MD) is a promising desalination technology for the treatment of high salinity water. Here, we investigated the fouling characteristics of produced water obtained from hydraulic fracturing by implementing a carbon nanotube immobilized membrane (CNIM) via direct contact membrane distillation. The CNIM exhibited enhanced water vapor flux and antifouling characteristics compared to the pristine membrane. The normalized flux decline with the polytetrafluoroethylene (PTFE) membrane after 7 h of operation was found to be 18.2% more than the CNIM. The addition of 1-Hydroxy Ethylidene-1, 1-Diphosphonic acid (HEDP) antiscalant was found to be effective in reducing the membrane fouling. The salt deposition on the membrane surface was 77% less in the CNIM, which was further reduced with the addition of HEDP in the feed by up to 135.4% in comparison with the PTFE membrane. The presence of carbon nanotubes (CNTs) on the membrane surface also facilitated the regenerability of the membrane. The results indicated that the CNIM regained 90.9% of its initial water flux after washing, whereas the unmodified PTFE only regained 81.1% of its initial flux after five days of operation.

scholarly journals Mechanical Vibration for the Control of Membrane Fouling in Direct Contact Membrane Distillation

Symmetry ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 126 ◽  
Author(s):  
Frank Huang ◽  
Carolyn Medin ◽  
Allie Arning
Keyword(s):  
Packing Density ◽  
Membrane Fouling ◽  
Direct Contact ◽  
Mechanical Vibration ◽  
Water Flux ◽  
Similar Rate ◽  
Membrane Distillation ◽  
Membrane Performance ◽  
Direct Contact Membrane Distillation ◽  
Flux Decline

One of the biggest challenges for direct contact membrane distillation (DCMD) in treating wastewater from flue gas desulfurization (FGD) is the rapid deterioration of membrane performance resulting from precipitate fouling. Chemical pretreatment, such as lime-soda ash softening, has been used to mitigate the issue, however, with significant operating costs. In this study, mechanical vibration of 42.5 Hz was applied to lab-scale DCMD systems to determine its effectiveness of fouling control for simulated FGD water. Liquid entry pressure and mass transfer limit of the fabricated hollow fiber membranes were determined and used as the operational constraints in the fouling experiments so that the observed membrane performance was influenced solely by precipitate fouling. Minimal improvement of water flux was observed when applying vibration after significant (~16%) water-flux decline. Initiating vibration at the onset of the experiments prior to the exposure of foulants, however, was promising for the reduction of membrane fouling. The water-flux decline rate was reduced by about 50% when compared to the rate observed without vibration. Increasing the module packing density from 16% to 50% resulted in a similar rate of water-flux decline, indicating that the fouling propensity was not increased with packing density in the presence of vibration.

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