Hydrophilic polymer-based membrane for oily wastewater treatment: A review

Ismail, Nor Hafiza; Salleh, Wan Norharyati Wan; Ismail, Ahmad Fauzi; Hasbullah, Hasrinah; Aziz, Farhana; Jaafar, Juhana

doi:10.1016/j.seppur.2019.116007

Cited by 345 publications

(122 citation statements)

References 122 publications

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“…Thus, the membrane-based process has emerged as an attractive option for treating oil/water emulsion [ 1 ]. Despite its advantages, such as high separation efficiency, less energy usage, smaller footprint, etc., membrane separation often experiences membrane fouling due to strong interaction between oil droplets and the membrane surface, and unfavorable pore structure and morphology [ 8 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…Studies reported that plain polymeric membranes such as polyvinylidene fluoride (PVDF) pose hydrophobic properties and thus increase the membrane fouling propensity, which deteriorates the hydraulic performance [ 10 , 13 ]. Membrane fouling also leads to a severe decline in flux as well as impeding long-term operation of a membrane process [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

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Polyvinylidene Fluoride Membrane Via Vapour Induced Phase Separation for Oil/Water Emulsion Filtration

et al. 2021

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Membrane-based technology is an attractive option for the treatment of oily wastewater because of its high oil removal efficiency, small footprint and operational simplicity. However, filtration performance is highly restricted by membrane fouling, especially when treating oil/water emulsion as a result of strong interaction between oil droplets and the hydrophobic property of the membrane. This study explores the fabrication of polyvinylidene fluoride (PVDF)-based membrane via the vapour induced phase separation (VIPS) method while incorporating polyvinyl pyrrolidone (PVP) as a hydrophilic additive to encounter membrane fouling issues and improve membrane filterability. The resulting membranes were characterized and tested for oil/water emulsion filtration to evaluate their hydraulic, rejection and anti-fouling properties. Results show that the changes in membrane morphology and structure from typical macrovoids with finger-like substructure to cellular structure and larger membrane pore size were observed by the prolonged exposure time from 0 to 30 min through the VIPS method. The enhanced clean water permeability is attributed to the addition of PVP–LiCl in the dope solution that enlarges the mean flow pore size from 0.210 ± 0.1 to 7.709 ± 3.5 µm. The best performing membrane was the VIPS membrane with an exposure time of 5 min (M-5), showing oil/water emulsion permeability of 187 Lm−2 h−1 bar−1 and oil rejection of 91.3% as well as an elevation of 84% of clean water permeability compared to pristine PVDF developed using a typical non-solvent induced phase separation (NIPS) method. Despite the relatively high total fouling, M-5 was able to maintain its high permeability by water flushing as a simple operation for membrane fouling control. The performance was achieved thanks to combination of the large mean flow pore size and hydrophilic property from residual PVP in the membarne matrix. Overall, the results demonstrate the potential of the optimum VIPS method in the presence of PVP and LiCl additives for oil/water emulsion treatment.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polyvinylidene Fluoride Membrane Via Vapour Induced Phase Separation for Oil/Water Emulsion Filtration

et al. 2021

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“…La presencia de hidrocarburos en aguas residuales, que son vertidas a cuerpos de agua o al suelo, causa graves daños ambientales y problemas a la salud de los seres vivos incluyendo a los humanos. Los derivados de hidrocarburos como la gasolina, el kerosene, el Gasoil, los aceites lubricantes, el asfalto, entre otros, generan contaminación del agua al ser vertidos en ella (Ismail et al, 2020). Dicha contaminación afecta las condiciones fisicoquímicas de agua al producir una disminución de oxígeno disuelto por reducción del intercambio de oxígeno entre la fase atmósfera -agua, así mismo, impiden la entrada de luz al medio, lo que inhibe el crecimiento de ciertas especies y disminuye la fijación de nutrientes (Velásquez, 2017).…”

Section: Introductionunclassified

Untitled

2021

Tecnol. cienc. agua

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“…However, the presence of emulsion in oily wastewater essentially requires a demulsification for its effective treatment. There are several technologies that have been used for separating oil and water, such as various physical (e.g., gravitational settling, thermal treatment, membrane separation, flotation, ultrasonic), biological (bioaugmentation, biostimulation), and chemical (e.g., solidifiers, demulsifiers, sorbents) processes [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. Chemical demulsification using various demulsifiers is one of the reliable methods which has been widely used in industries for breaking emulsions [ 15 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Application of Ionic Liquids for Chemical Demulsification: A Review

Hassanshahi

2020

Molecules

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In recent years, ionic liquids have received increasing interests as an effective demulsifier due to their characteristics of non-flammability, thermal stability, recyclability, and low vapor pressure. In this study, emulsion formation and types, chemical demulsification system, the application of ionic liquids as a chemical demulsifier, and key factors affecting their performance were comprehensively reviewed. Future challenges and opportunities of ionic liquids application for chemical demulsification were also discussed. The review indicted that the demulsification performance was affected by the type, molecular weight, and concentration of ionic liquids. Moreover, other factors, including the salinity of aqueous phase, temperature, and oil types, could affect the demulsification process. It can be concluded that ionic liquids can be used as a suitable substitute for commercial demulsifiers, but future efforts should be required to develop non-toxic and less expensive ionic liquids with low viscosity, and the demulsification efficiency could be improved through the application of ionic liquids with other methods such as organic solvents.

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Hydrophilic polymer-based membrane for oily wastewater treatment: A review

Cited by 345 publications

References 122 publications

Polyvinylidene Fluoride Membrane Via Vapour Induced Phase Separation for Oil/Water Emulsion Filtration

Polyvinylidene Fluoride Membrane Via Vapour Induced Phase Separation for Oil/Water Emulsion Filtration

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Application of Ionic Liquids for Chemical Demulsification: A Review

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