nanofiltration Articles
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Preparation of three-bore hollow fiber charged nanofiltration membrane for separation of organics and salts
Three-bore hollow fiber charged nanofiltration (NF) membrane was prepared by interfacial polymerization (IP). The results showed that the flux and rejection of NF membrane prepared in this study increased with the increasing in the operating pressure. The water flux decreased and rejection for obvious dyes increased as the solute concentration increased. The separation factor for mixture of ...
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Effect of solution chemistry and operating conditions on the nanofiltration of acid dyes by a nanocomposite membrane
A composite nanofiltration membrane was developed by a poly(acrylic acid) in situ ultraviolet (UV) graft polymerization process using an ultrafiltration polysulfone membrane as a porous support, by a phase inversion method. SEM images showed that the PSf membranes had numerous finger-like pores. Atomic force microscopy (AFM) showed that the roughness of the surface was reduced by an increase in ...
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Synthesis and characterization of composite polysulfone membranes for desalination in nanofiltration technique
Composite nanofiltration (NF) membrane was developed polyacrylic acid (PAA) in situ UV graft polymerization process using ultrafiltration (UF) polysulfone (PSF) membrane as porous support. FT-IR spectra indicated that grafting was performed and it show peaks at 1,732 cm−1 and 3,396 cm−1 region for CO and OH starching bond of acrylic acid (AA) monomer, respectively. AFM microscopy showed the ...
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Treatment of dairy wastewater by two-stage membrane operation with ultrafiltration and nanofiltration
Treatment of dairy wastewater by a two-stage membrane process with ultrafiltration (UF) and nanofiltration (NF) was investigated. The results showed that the flux of UF was higher at pH = 4.6 than that at pH = 8 because the resistance of the fouling membrane was lower at the isoelectric point of protein (pH = 4.6) in UF operation. Protein rejection exceeded 99% by UF + NF operation. Lactose ...
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NF Membrane Technology
Nanofiltration (NF) or nanofiltration membrane technology is a relatively recent membrane filtration process used most often with low total dissolved solids water such as surface water and fresh groundwater, with the purpose of softening (polyvalent cation removal) and removal of disinfection by-product precursors such as natural organic matter and synthetic organic matter. The membranes are ...
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NF Membrane Technology
Nanofiltration (NF) or nanofiltration membrane technology is a relatively recent membrane filtration process used most often with low total dissolved solids water such as surface water and fresh groundwater, with the purpose of softening (polyvalent cation removal) and removal of disinfection by-product precursors such as natural organic matter and synthetic organic matter. The membranes are key ...
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Nanofiltration Ceramic Membrane Element
Ceramic Nanofiltration membrane is relatively recent membrane filtration system, with the purpose of softening and removal of disinfection by-product precursors such as natural organic matter and synthetic organic matter. More ultrafiltration membrane system details here! CHARACTERISTICS OF NANOFILTRATION CERAMIC MEMBRANE ELEMENT Chemical, mechanical and thermal stability Ability of steam ...
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Membrane technology for the future treatment of paper mill effluents: chances and challenges of further system closure
The pressure on the European paper industry to further close its water circuits has increased significantly during the past decade. Since the technologies of the past can no longer meet the requirements of the future, new water treatment methods have become necessary. A constant rise in the interest in membrane technology expressed by the European paper industry confirms that in the future this ...
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Membrane technology for the future treatment of paper mill effluents: chances and challenges of further system closure
The pressure on the European paper industry to further close its water circuits has increased significantly during the past decade. Since the technologies of the past can no longer meet the requirements of the future, new water treatment methods have become necessary. A constant rise in the interest in membrane technology expressed by the European paper industry confirms that in the future this ...
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Concentrate of surfactant-based draw solutions in forward osmosis by ultrafiltration and nanofiltration
The exploration of coupling surfactants with highly charged phosphate as novel draw solutions for forward osmosis (FO) to minimize salt leakage and enhance draw solute recovery at low energy is presented for the first time. In this work, anionic (sodium dodecyl sulfate (SDS)), cationic (cetyltrimethylammonium bromide) and non-ionic (polyethylene glycol tert-octylphenyl ether, TX-100) ...
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A New Fast Acting Low PH Cleaner Paves the Way for a New Cleaning Philosophy for Integrated Membrane Systems
Abstract For many years ultrafiltration/microfiltration (UF/MF) has been replacing multi-media filtration as a seawater reverse osmosis (RO) or nanofiltration (NF) pre-treatment system. Initially the systems were treated as individual unit operations and optimized as such. However, the similarity in the flux maintenance requirements of the particle removal membranes and the desalination ...
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Membrane treatment of the bleaching plant (EPO) filtrate of a kraft pulp mill
The objective of this study was to evaluate the use of membrane technology to treat oxygen and peroxide-reinforced extraction stage (EPO) filtrate from a kraft pulp mill bleach plant. Three different types of tubular membranes were tested in a pilot plant: (i) tight ultrafiltration (UF); (ii) open UF followed by nanofiltration (UF + NF); and (iii) nanofiltration (NF). According to the ...
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Comparison of sand and membrane filtration as non-chemical pre-treatment strategies for pesticide removal with nanofiltration/low pressure reverse osmosis membranes
Pilot plant investigations of sand and membrane filtration (microfiltration (MF)/ultrafiltration (UF)/nanofiltration (NF)/low pressure reverse osmosis (LPRO)) have been performed to treat groundwater polluted with pesticides. The results show that simple treatment, with use of aeration and sand filtration or MF/UF membranes, does not remove pesticides. However, by reducing the content of key ...
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Ideal treatment of laundry wastewater with ultrafiltration installations
Treatment of very dirty work clothing also produces heavily polluted, oily/greasy wastewater. It is the aim of laundry wastewater treatment to reduce fresh water consumption and to minimise the volume of residuals. At the same time, adherence to the limit values according to appendix 55 of the General provisions on hydrocarbon, heavy metal and AOX contamination in wastewater must be guaranteed. ...
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Analyzing the spatial and temporal characteristics of membrane fouling
Fouling characteristics of crossflow flat-sheet membranes for two Nanofiltration (NF), one Ultrafiltration (UF), and one Microfiltration (MF) membranes were analyzed using 12.5 parts per million (mg/L) FeCl3 solution and 350 mg/L copper nanofluid. FeCl3 solution represents dissolved contaminant whereas copper nanofluid simulates particulate contaminant. The spatial and temporal fouling ...
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Nano this and Nano that?
Several terms, each with the prefix “nano-”, are now in use in the fields of filtration and its related separation processes, and it is important to be able to differentiate among their nuances of meaning. Firstly, there is nanometer itself, from which the others derive, and which is precise, measuring one thousandth of a micrometer or one millionth of a millimeter. It is thus a very ...
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Recent operational experiences of FILMTEC™ NF270 membrane in Europe
Nanofiltration (NF) is an attractive technology for potable and industrial water treatment because NF operates between ultrafiltration (UF) and reverse osmosis (RO) membranes. NF is designed to remove a high percentage of organic contaminants (humic acids, pesticides, color bodies) while passing a medium to high percentage of salt. Compared to UF membranes, the NF product water quality is ...
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Nanofiltration for enhanced removal of disinfection by-product (DBP) precursors in swimming pool water–retention and water quality estimation
Three nanofiltration (NF) membranes with a chlorine tolerance ≥ 1 mg L-1 were applied to reduce DBPs and their precursors in swimming pool water. A lab scale plant with crossflow modules was installed in by-pass at the sand filter outlet of a swimming pool for a period of several weeks. The chlorine tolerances of the membranes SB90 and NP030 were found to be adequate for filtration under swimming ...
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VSEP filters mine tailing pond effluent with no pre-treatment required
New Logic International installed its Vibratory Shear Enhanced Processing (VSEP) system in March, 1998 at a major California rare earth mining and manufacturing facility. The VSEP is used for treatment of mine tailing pond effluent at this facility with no pretreatment required. The VSEP system uses nanofiltration followed by ultrafiltration membrane modules and is able to treat the mine tailing ...
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Shandong Linyi Chemical Plant Chemical Wastewater - Case Study
Application: Chemical wastewater Scale: 20 tons / hour * 2 Process: UF-MTNF-MTNF, UF-MTRO-MTRO Time: 2015 INTRODUCTION In the treatment of high-salt, high-temperature, high-pH chemical production wastewater, Jiarong uses a tubular ultrafiltration membrane plus two-stage nanofiltration membrane treatment process to separate the different salts in the wastewater, and produce water and ...
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