Nanofiltration membranes review: Recent advances and future prospects

Mohammad, Abdul Wahab; Teow, Yeit Haan; Ang, Wei Lun; Chung, Ying Tao; Oatley-Radcliffe, Darren L.; Hilal, Nidal

doi:10.1016/j.desal.2014.10.043

Cited by 1,644 publications

(720 citation statements)

References 272 publications

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“…Zeolite membrane test which used at 5 Nanoparticles membrane has been largely used in some cases because increasing in membrane hydrophilicity. The same study shown by Mohammad et al [9]. According Amoudi and Lovitt [10], nanofiltration membranes flux decline due to fouling pores because the colloidal particles contained in wastewater.…”

Section: Effect the Wastewater Concentration To The Flux Value In Lausupporting

confidence: 54%

The Performance Operation of Zeolite as Membrane with using Laundry Waste Water

Damayanti

Sari²,

Afifah³

et al. 2016

J Membra Sci Technol

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hours to precipitate KCl crystals formed. The precipitate is removed; the solution is taken, filtered, and dried. Results zeolite that has been purified white powdery substance. Preparation of membranePreparation of membrane is divided into two steps. The first step is to weigh as much as 3 grams and 6 grams of powdered zeolite. Zeolite powder put in a centrifuge bottle and then added 35 ml of 2-propanol. The mixture was then centrifuged for 10 minutes at a speed of 600 rpm. After that, the supernatant liquid on a white precipitate was removed and put in a glass beaker containing a mixture of 3.5 g NH 4 Cl and 200 ml of distilled water. The mixture is then stirred using a magnetic stirrer for 1 hour.The next stage is the mixing of sediment mixing zeolite with NH 4 Cl solution, distilled water, PVA (poly vinyl alcohol) and PEG (polyethylene glycol). The solution is heated until all ingredients are mixed with smooth and thickened. After the solution has thickened then printed using a small petri dish and left for 30 hours to dry. Dry membranes are browned and available for use. Membrane test in crossflow reactorIn this research, we used three variations concentration of AbstractZeolites are used as raw material to make nanofiltration membrane because they are easily obtained and cheap. The used of zeolite membranes can be an alternative wastewater treatment. One of the potential alternatives for wastewater treatment is nanofiltration membranes with pore size of 0.001 µm filtered high organic content of laundry which contained high turbidity and phospate. The content of turbidity and phosphate in the laundry wastewater is needed to treat before being discharged into river. The purpose of this study is to determine the value of rejection and flux for each variation of concentration. Variation of concentration that used were pure wastewater which dilluted with tap water in ratio 100%, 75%, and 50%. Based on this research, the characteristics of laundry waste water before filtration process are turbidity parameters showed for 100%, 75% and 50% are 151 NTU, 146 NTU, 143 NTU and for phosphate parameters are 31.30 mg/L, 25.8 mg/L and 11.49 mg/L. After filtration process, the highest rejection value of turbidity for each dilluted concentrations 100%, 75%, 50% are 88.46%, 87.82%, 87.58%. The highest flux value for each dilluted concentrations 100%, 75% and 50% are 7,22 L/m

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Section: Effect the Wastewater Concentration To The Flux Value In Lausupporting

confidence: 54%

The Performance Operation of Zeolite as Membrane with using Laundry Waste Water

Damayanti

Sari²,

Afifah³

et al. 2016

J Membra Sci Technol

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“…Nanofiltration (NF) is a pressure driven membrane-based desalination technique. The pore sizes of NF membranes are between that of reverse osmosis (RO) and ultrafiltration (UF) membranes [2] [3] [4] [5] [6] . NF has the unique capability to preferentially remove multivalent ions [7] [8].…”

Section: Significance Of Nanofiltration For Elevated Feed Temperaturesmentioning

confidence: 99%

Effect of temperature on ion transport in nanofiltration membranes: Diffusion, convection and electromigration

2017

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Nanofiltration performance as a function of feed temperature is relevant to several industrial settings including pretreatment for scale control in thermal desalination. Understanding of solute transport as a function of temperature is critical for effective membrane and system design. In this study, nanofiltration is modeled at 22, 40 and 50 o C using the Donnan Steric Pore Model with dielectric exclusion (DSPM-DE).This modeling includes the temperature dependence of the three modes of solute transport, namely the convective, electromigrative, and diffusive modes, and the three mechanisms of solute exclusion, namely Donnan, steric, and dielectric exclusion. The effect of temperature is captured through the variation of membrane parameters and solvent and ionic mobilities with temperature. We compare the most abundant ionic compound in natural water, sodium-chloride with magnesium-chloride to portray how the salt passage and rejection change for a 1:1 salt compared to a 2:1 salt, and we analyze Arabian Gulf seawater to understand how rejection of scale-forming ions, such as Mg 2+ and Ca 2+ , is affected by feed temperature.In all cases, solute transport increases with temperature, attributed predominantly to the cumulative effect of membrane parameters and only to a small extent (up to 5%) to the solvent viscosity and ion diffusivity together.Keywords: Nanofiltration, Temperature, Ion transport, Desalination

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“…demonstrates the surging interest in the environmental applications of NF, which surpassed any other areas, from membrane fabrication to economics and design, based on the number of publications since 2008 [11].…”

Section: Introductionmentioning

confidence: 99%

Fundamentals of low-pressure nanofiltration: Membrane characterization, modeling, and understanding the multi-ionic interactions in water softening

Labban

Liu

Chong

et al. 2017

Journal of Membrane Science

153

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Recently, a novel class of low-pressure nanofiltration (NF) hollow fiber membranes, particularly suited for water softening and desalination pretreatment have been fabricated in-house using layer-by-layer (LbL) deposition with chemical crosslinking. These membranes can operate at exceedingly low pressures (2 bar), while maintaining relatively high rejections of multivalent ions. In spite of their great potential, our understanding as to what makes them superior has been limited, demanding further investigation before any large-scale implementation can be realized. In this study, the Donnan-Steric Pore Model with dielectric exclusion (DSPM-DE) is applied for the first time to these membranes to describe the membrane separation performance, and to explain the observed rejection trends, including negative rejection, and their underlying multi-ionic interactions. Experiments were conducted on a spectrum of feed chemistries, ranging from uncharged solutes to single salts, salt mixtures, and artificial seawater to characterize the membrane and accurately predict its performance. Modeling results were validated with experiments, and then used to elucidate the working principles that underlie the low-pressure softening process. An approach based on sensitivity analysis shows that the membrane pore dielectric constant, followed by the pore size, are primarily responsible for the selectively high rejections of the NF membranes to multivalent ions. Surprisingly, the softening process is found to be less sensitive to changes in membrane charge density. Our findings demonstrate that the unique ability of these membranes to exclusively separate multivalent ions from the solution, while allowing monovalent ions to permeate, is key to making this low-pressure softening process realizable.

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Nanofiltration membranes review: Recent advances and future prospects

Cited by 1,644 publications

References 272 publications

The Performance Operation of Zeolite as Membrane with using Laundry Waste Water

The Performance Operation of Zeolite as Membrane with using Laundry Waste Water

Effect of temperature on ion transport in nanofiltration membranes: Diffusion, convection and electromigration

Fundamentals of low-pressure nanofiltration: Membrane characterization, modeling, and understanding the multi-ionic interactions in water softening

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