Colloidal fouling of nanofiltration membranes: A novel transient electrokinetic model and experimental study

Mamun, Abdullaha Al; Sadrzadeh, Mohtada; Chatterjee, Reeshav; Bhattacharjee, Subir; De, Sirshendu

doi:10.1016/j.ces.2015.08.022

Cited by 25 publications

(14 citation statements)

References 34 publications

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“…It also directly relates the cake volume fraction (

ϕ_{c}

) and zeta potential of particles ( ψ p ) to the electroviscous resistance. Our previous studies showed that the electroosmotic effect becomes significant for cake layers with higher cake volume fraction and zeta potential [23]. For

ϕ_{c}

~ 0.5 and ψ p ~ −30 mV in the present study, there would be no electroosmotic backflow and thus g * = 1 [23].…”

Section: Theoretical Background and Development Of Data Analysis Mmentioning

confidence: 54%

“…Our previous studies showed that the electroosmotic effect becomes significant for cake layers with higher cake volume fraction and zeta potential [23]. For

ϕ_{c}

~ 0.5 and ψ p ~ −30 mV in the present study, there would be no electroosmotic backflow and thus g * = 1 [23]. The expressions of A K and M c are given as follows:

A_{K} = \frac{1}{1 - \frac{9}{5} ϕ_{c}^{1 / 3} + ϕ_{c} - \frac{1}{5} ϕ_{c}^{2}}

M_{c} = ρ_{p} ϕ_{c} δ_{c} A_{m}

…”

Section: Theoretical Background and Development Of Data Analysis Mmentioning

confidence: 67%

“…The Kuwabara cell model [22] can be used to estimate the hydraulic resistance through the cake layer:

R_{c} = \frac{9 A_{K} M_{c}}{2 a^{2} g^{*} ρ_{p} A_{m}} = \frac{9 A_{K} δ_{c} false(1 - ε_{c} false)}{2 a^{2} g^{*}}

where ε c is the average cake layer porosity,

δ_{c}

is the thickness of cake layer (m), a is the particle diameter (m), A m is the effective membrane area (m 2 ), A K is the Kuwabara correction factor accounting for the effect of neighboring particles in the cake layer, and g * accounts for electroosmotic effect in swarm of charged colloidal particles [23]. The parameter g * quantifies this effect in terms of an electroviscous resistance, which is additional to the hydrodynamic resistance of the cake layer.…”

Section: Theoretical Background and Development Of Data Analysis Mmentioning

confidence: 99%

“…Tortuosity in the present work is also related to porosity by

ς = 1 - \ln ε_{c}^{2}

[17,24]. Hence, Equations (9) and (10) are both related to cake porosity (or cake volume fraction) which is calculated by setting these two equations equal [23]. After finding the cake porosity, CEOP is calculated using either of these equations.…”

Section: Theoretical Background and Development Of Data Analysis Mmentioning

confidence: 99%

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Colloidal Fouling of Nanofiltration Membranes: Development of a Standard Operating Procedure

et al. 2017

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Fouling of nanofiltration (NF) membranes is the most significant obstacle to the development of a sustainable and energy-efficient NF process. Colloidal fouling and performance decline in NF processes is complex due to the combination of cake formation and salt concentration polarization effects, which are influenced by the properties of the colloids and the membrane, the operating conditions of the test, and the solution chemistry. Although numerous studies have been conducted to investigate the influence of these parameters on the performance of the NF process, the importance of membrane preconditioning (e.g., compaction and equilibrating with salt water), as well as the determination of key parameters (e.g., critical flux and trans-membrane osmotic pressure) before the fouling experiment have not been reported in detail. The aim of this paper is to present a standard experimental and data analysis protocol for NF colloidal fouling experiments. The developed methodology covers preparation and characterization of water samples and colloidal particles, pre-test membrane compaction and critical flux determination, measurement of experimental data during the fouling test, and the analysis of that data to determine the relative importance of various fouling mechanisms. The standard protocol is illustrated with data from a series of flat sheet, bench-scale experiments.

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“…It also directly relates the cake volume fraction (

ϕ_{c}

ϕ_{c}

~ 0.5 and ψ p ~ −30 mV in the present study, there would be no electroosmotic backflow and thus g * = 1 [23].…”

Section: Theoretical Background and Development Of Data Analysis Mmentioning

confidence: 54%

“…Our previous studies showed that the electroosmotic effect becomes significant for cake layers with higher cake volume fraction and zeta potential [23]. For

ϕ_{c}

~ 0.5 and ψ p ~ −30 mV in the present study, there would be no electroosmotic backflow and thus g * = 1 [23]. The expressions of A K and M c are given as follows:

A_{K} = \frac{1}{1 - \frac{9}{5} ϕ_{c}^{1 / 3} + ϕ_{c} - \frac{1}{5} ϕ_{c}^{2}}

M_{c} = ρ_{p} ϕ_{c} δ_{c} A_{m}

…”

Section: Theoretical Background and Development Of Data Analysis Mmentioning

confidence: 67%

“…The Kuwabara cell model [22] can be used to estimate the hydraulic resistance through the cake layer:

R_{c} = \frac{9 A_{K} M_{c}}{2 a^{2} g^{*} ρ_{p} A_{m}} = \frac{9 A_{K} δ_{c} false(1 - ε_{c} false)}{2 a^{2} g^{*}}

where ε c is the average cake layer porosity,

δ_{c}

Section: Theoretical Background and Development Of Data Analysis Mmentioning

confidence: 99%

“…Tortuosity in the present work is also related to porosity by

ς = 1 - \ln ε_{c}^{2}

Section: Theoretical Background and Development Of Data Analysis Mmentioning

confidence: 99%

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Colloidal Fouling of Nanofiltration Membranes: Development of a Standard Operating Procedure

et al. 2017

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“…The bar chart in Figure 3(a) shows that the initial flux decline for the NF270 membrane was lower than the other NF membranes. Fouling is mainly affected by the feed properties (e.g., pH, ionic strength, and concentration) [43], operating conditions (e.g., pressure and cross-flow velocity) [44], and the physicochemical properties of the membrane (e.g., hydrophilicity and charge) [25].…”

Section: Treatment Of Wls Inlet Water By Various Nf Membranesmentioning

confidence: 99%

Nanofiltration for the Treatment of Oil Sands-Produced Water

Sadrzadeh¹,

Pernitsky²,

McGregor³

2018

Nanofiltration

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This chapter summarizes nanofiltration (NF) studies focused on the treatment of thermal in-situ steam-assisted gravity drainage (SAGD)-produced water streams in the Alberta, Canada, oil sands industry. SAGD processes use recycled produced water to generate steam, which is injected into oil-bearing formations to enhance oil recovery. NF has potential applications in the produced water recycling treatment process for water softening, dissolved organic matter removal, and partial desalination, to improve recycle rates, reduce make-up water consumption, and provide an alternative to desalination technologies (thermal evaporation and reverse osmosis). The aim of this study was to provide proofof-concept for NF treatment of the following produced water streams in the SAGD operation: warm lime softener (WLS) inlet water, boiler feed water (BFW), and boiler blowdown (BBD) water. Commercial NF membranes enabled removal of up to 98% of the total dissolved solids (TDS), total organic carbon (TOC), and dissolved silica, which is significant compared to the removal achieved using conventional SAGD-produced water treatment processes. More than 99% removal of divalent ions was achieved using tight NF membranes, highlighting the potential of NF softening for oil sands-produced water streams. The NF process configurations studied provide feasible process arrangements suitable for integration into existing and future oil sands and other produced water treatment schemes.

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Aquaporin‐Based Biomimetic Membranes for Low Energy Water Desalination and Separation Applications

Azarafza

Islam

Golpazir-Sorkheh

et al. 2023

Adv Funct Materials

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The emergence of biomimetic materials developed using nature's inspiration and biological domains can drive a paradigm shift in the design and operation of future‐generation materials in separation applications. In recent years, biomimetic membranes have drawn interest of many researchers for water treatment applications. Among the biomimetic membranes, protein‐based membranes, specifically those synthesized by aquaporin, have received much attention in recent years due to their high osmotic water permeability and excellent ability to remove small molecules, thereby overcoming the trade‐off between the water flux and the contaminant's rejection. The separation efficiency and fouling properties are significantly improved by taking advantage of the strategies evolved in nature. This review provides a comprehensive overview of the state‐of‐the‐art aquaporin‐based biomimetic membranes (ABMs), mainly focusing on their synthesis, characterization, and performance as selective layer in composite membranes for reverse osmosis, nanofiltration, and forward osmosis for water desalination. Fabrication methods and characterization techniques of ABMs and their performance in water desalination are also reviewed, while the main obstacles for their successful commercial viability in wastewater treatment are provided. The applications of ABMs in various separation processes other than water desalination and their potential market are presented to inspire future researchers in this versatile area.

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Colloidal fouling of nanofiltration membranes: A novel transient electrokinetic model and experimental study

Cited by 25 publications

References 34 publications

Colloidal Fouling of Nanofiltration Membranes: Development of a Standard Operating Procedure

Colloidal Fouling of Nanofiltration Membranes: Development of a Standard Operating Procedure

Nanofiltration for the Treatment of Oil Sands-Produced Water

Aquaporin‐Based Biomimetic Membranes for Low Energy Water Desalination and Separation Applications

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