Enhanced Nanofiltration Process of Thin Film Composite Membrane Using Dodecyl Phenol Ethoxylate and Oleic Acid Ethoxylate for Oilfield Calcite Scale Control

This research studied the enhancing effect on the nanofiltration composite (TFCNF) membrane of two non-ionic surfactants on a thin-film composite nanofiltration membrane (TFCNF) for calcite scale (CaCO3) inhibition in oilfield application to develop a multifunctional filtration system: nanofiltration, antiscalant, and scale inhibitors. The effectiveness of dodecyl phenol ethoxylate (DPE) and oleic acid ethoxylate (OAE) as novel scale inhibitors were studied using the dynamic method. Scaling tests on the membrane were performed to measure the scaling of the inhibited membrane with and without scale inhibitors for salt rejection, permeability, and flux decline. The results revealed that the TFCNF membrane flux decline was improved in the presence of scale inhibitors from 22% to about 15%. The rejection of the membrane scales increases from 72% for blank membranes, reaching 97.2% and 88% for both DPE and OAE, respectively. These confirmed that scale inhibitor DPE had superior anti-scaling properties against calcite deposits on TFCNF membranes. Inhibited scaled TFCNF membrane was characterized using environmental scanning electron (ESEM), FTIR, and XRD techniques. The results of the prepared TFCNF membrane extensively scaled by the calcite deposits were correlated to its morphology.

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Influences of Combined Organic Fouling and Inorganic Scaling on Flux and Fouling Behaviors in Forward Osmosis

Membranes ◽

10.3390/membranes10060115 ◽

2020 ◽

Vol 10 (6) ◽

pp. 115

Author(s):

Youngpil Chun ◽

Kwanho Jeong ◽

Kyung Hwa Cho

Keyword(s):

Thin Film ◽

Bovine Serum Albumin ◽

Calcium Ions ◽

Forward Osmosis ◽

Underlying Mechanism ◽

Layer Formation ◽

Film Composite ◽

Thin Film Composite ◽

Flux Decline ◽

Organic Fouling

This study investigated the influence of combined organic fouling and inorganic scaling on the flux and fouling behaviors of thin-film composite (TFC) forward osmosis (FO) membranes. Two organic macromolecules, namely, bovine serum albumin (BSA) and sodium alginate (SA), and gypsum (GS), as an inorganic scaling agent, were selected as model foulants. It was found that GS scaling alone caused the most severe flux decline. When a mixture of organic and inorganic foulants was employed, the flux decline was retarded, compared with when the filtration was performed with only the inorganic scaling agent (GS). The early onset of the conditioning layer formation, which was due to the organics, was probably the underlying mechanism for this inhibitory phenomenon, which had suppressed the deposition and growth of the GS crystals. Although the combined fouling resulted in less flux decline, compared with GS scaling alone, the concoction of SA and GS resulted in more fouling and flux decline, compared with the mixture of BSA and GS. This was because of the carboxyl acidity of the alginate, which attracted calcium ions and formed an intermolecular bridge.

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Incorporation of oleic acid-modified Ag@ZnO core-shell nanoparticles into thin film composite membranes for enhanced antifouling and antibacterial properties

Journal of Membrane Science ◽

10.1016/j.memsci.2020.117956 ◽

2020 ◽

Vol 602 ◽

pp. 117956

Author(s):

Xiujing Huang ◽

Yingbo Chen ◽

Xianshe Feng ◽

Xiaoyu Hu ◽

Yufeng Zhang ◽

...

Keyword(s):

Thin Film ◽

Oleic Acid ◽

Antibacterial Properties ◽

Composite Membranes ◽

Core Shell ◽

Shell Nanoparticles ◽

Film Composite ◽

Thin Film Composite ◽

Core Shell Nanoparticles

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Performance of Acacia Gum as a Novel Additive in Thin Film Composite Polyamide RO Membranes

Membranes ◽

10.3390/membranes9020030 ◽

2019 ◽

Vol 9 (2) ◽

pp. 30 ◽

Cited By ~ 1

Author(s):

Yehia Manawi ◽

Viktor Kochkodan ◽

Ahmad Ismail ◽

Abdul Mohammad ◽

Muataz Ali Atieh

Keyword(s):

Thin Film ◽

Interfacial Polymerization ◽

Water Flux ◽

Arabian Gulf ◽

Film Composite ◽

Thin Film Composite ◽

Acacia Gum ◽

Flux Decline ◽

Scanning Electron ◽

Reduced Surface

Novel thin film composite (TFC) polyamide (PA) membranes blended with 0.01–0.2 wt.% of Acacia gum (AG) have been prepared using the interfacial polymerization technique. The properties of the prepared membranes were evaluated using contact angle, zeta potential measurements, Raman spectroscopy, scanning electron microscopy, and surface profilometer. It was found that the use of AG as an additive to TFC PA membranes increased the membrane’s hydrophilicity (by 45%), surface charge (by 16%) as well as water flux (by 1.2-fold) compared with plain PA membrane. In addition, the prepared PA/AG membranes possessed reduced surface roughness (by 63%) and improved antifouling behavior while maintaining NaCl rejection above 96%. The TFC PA/AG membranes were tested with seawater collected from the Arabian Gulf and showed higher salt rejection and lower flux decline during filtration when compared to commercial membranes (GE Osmonics and Dow SW30HR). These findings indicate that AG can be used as an efficient additive to enhance the properties of TFC PA membranes.

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Fouling Is the Beginning: Upcycling Biopolymer-Fouled Substrates for Fabricating High-Permeance Thin-Film Composite Polyamide Membranes

10.26434/chemrxiv.12121896 ◽

2020 ◽

Author(s):

Ruobin Dai ◽

Hongyi Han ◽

Tianlin Wang ◽

Jiayi Li ◽

Chuyang Y. Tang ◽

...

Keyword(s):

Thin Film ◽

High Pressure ◽

End Of Life ◽

Water Purification ◽

Low Pressure ◽

Polymeric Membranes ◽

Membrane Recycling ◽

Film Composite ◽

Thin Film Composite ◽

First Time

Commercial polymeric membranes are generally recognized to have low sustainability as membranes need to be replaced and abandoned after reaching the end of their life. At present, only techniques for downcycling end-of-life high-pressure membranes are available. For the first time, this study paves the way for upcycling fouled/end-of-life low-pressure membranes to fabricate new high-pressure membranes for water purification, forming a closed eco-loop of membrane recycling with significantly improved sustainability.

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