Enhanced Performance of Thin Film Composite Forward Osmosis Membrane by Chemical Post-Treatment

Liu, Zheng; Chen, Jiangrong; Cao, Zhen; Wang, Jian; Guo, Chuigen

doi:10.1088/1755-1315/108/2/022023

Cited by 2 publications

(4 citation statements)

References 9 publications

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“…No visible differences were seen when analyzing the polyamide layer images at different magnifications after alcohol treatments. Previous AFM studies have reported changes in the polyamide layer morphology by contacting it with ethanol [8,33]. Therefore, we believe that the vacuum-dry conditions of the SEM measurements do not allow for visualization of these changes, indicating that internal water content in hydrated layers can be the origin of the morphology changes seen by AFM.…”

Section: Resultsmentioning

confidence: 89%

“…The results show that the average membrane surface roughness increases after contact with short-chain alcohols, except in the case of IPA, in which the average change was 0%. Liu and coworkers [8] also observed an increase in membrane surface roughness after contact with ethanol for 5 min. However, they also obtained an increase in roughness using a 50% IPA aqueous solution.…”

Section: Resultsmentioning

confidence: 90%

“…Due to the hydrophobic nature of the porous support layer [4], some suggest soaking membranes in a short-chain alcohol to ensure wetting prior to use [5,6,7]. Alcohols used for wetting are often ethanol and 2-propanol (or isopropyl alcohol, IPA), and contact times range from minutes to days [5,7,8,9,10,11,12,13]. However, the water permeance and salt rejection properties of TFC membranes can change after contact with these alcohols [5,7,8,9,10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Short-Term Contact with C1–C4 Monohydric Alcohols on the Water Permeance of MPD-TMC Thin-Film Composite Reverse Osmosis Membranes

et al. 2019

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In this paper, we discuss the effect of alcohol contact on the transport properties of thin-film composite reverse osmosis membranes. Five commercial membranes were studied to quantify the changes in water permeance and sodium chloride rejection from contact with five C1–C4 monohydric, linear alcohols. Water permeance generally increased without decreasing rejection after short-term contact. The extent of these changes depends on the membrane and alcohol used. Young′s modulus measurements showed decreased stiffness of the active layer after contacting the membranes with alcohol, suggesting plasticization. Data analysis using a dual-mode sorption model identified positive correlations of the initial water permeance, as well as the change in free energy of mixing between water and the alcohols, with the increase in water permeance after alcohol contact. We suggest that the mixing of water with the alcohols facilitates alcohol penetration into the active layer, likely by disrupting inter-chain hydrogen bonds, thus increasing the free volume for water permeation. Our studies provide a modeling framework to estimate the changes in transport properties after short-term contact with C1–C4 alcohols.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Effect of Short-Term Contact with C1–C4 Monohydric Alcohols on the Water Permeance of MPD-TMC Thin-Film Composite Reverse Osmosis Membranes

et al. 2019

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“…Modules were shipped and stored in a 20% ethanol solution per the manufacturer's recommendations, which causes swelling of the membrane [48][49][50]. Ethanol swelling has been shown to increase membrane performance.…”

Section: Forward Osmosis With Pretreated Pwmentioning

confidence: 99%

Pretreatment Techniques for Produced Water with Subsequent Forward Osmosis Remediation

Liden

Hildenbrand

Schug

2019

Water

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Unconventional oil and gas extraction is on the rise across the United States and comprises an integral component in meeting the nation’s energy needs. The primary by-product of this industrious process is produced water, which is a challenging matrix to remediate because of its complex physical and chemical composition. Forward osmosis is a viable option to treat high-salinity produced water; however, fouling has been an issue. This study aimed to treat produced water before using forward osmosis as a remediation option. Trials consisted of a series of five experiments in order to evaluate the performance of the membrane. Samples were treated by centrifugation, activated carbon, filtration, ferric chloride, as well as coagulants and a polymer. It can be concluded that forward osmosis can be used to extract water from high-salinity oil field brines and produced water, and that pretreating the produced water decreased the tendency for fouling. The pretreatment with the overall best performance was activated carbon, which also yielded the lowest total organic carbon concentrations of 1.9 mg/L. During remediation trials using produced water pretreated with activated carbon as the feed solution, there was a 14% decrease in flux over the course of the 7 h trials. The membrane performance was restored after washing.

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Enhanced Performance of Thin Film Composite Forward Osmosis Membrane by Chemical Post-Treatment

Cited by 2 publications

References 9 publications

Effect of Short-Term Contact with C1–C4 Monohydric Alcohols on the Water Permeance of MPD-TMC Thin-Film Composite Reverse Osmosis Membranes

Effect of Short-Term Contact with C1–C4 Monohydric Alcohols on the Water Permeance of MPD-TMC Thin-Film Composite Reverse Osmosis Membranes

Pretreatment Techniques for Produced Water with Subsequent Forward Osmosis Remediation

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