uf membrane characterization Articles

  • Practical Characterization of NF/UF Membranes

    Introduction Membrane separations in the ultrafiltration (UF) and especially the nanofiltration (NF) regions of the filtration spectrum are governed by a complex combination of both steric exclusion and surface force interactions. UF and NF membranes bearing formal surface charges display unusual selectivity behavior not predicted on the basis of physical pore size alone. Therefore, practical ...

  • Effects of Surface Force Interactions on an NF/UF Membrane

    Summary Appreciation of a membrane's surface chemistry and steric exclusion character is needed to truly understand and predict membrane performance for specific industrial separations. The interpreter of membrane characterization data must consider both factors in the assessment of separation potential. The test conditions employed will strongly influence the separation data outcome, as will ...


  • Novel Separations by a Charged NF/UF Membrane

    Introduction Separation characteristics of a novel, thin-layer composite (TLC®) membrane bearing an anionic surface charge are elucidated using three distinct approaches. These include solute challenges to demonstrate apparent molecular weight cut-off (MWCO), affinity chromatography to demonstrate surface force interactions between solute and membrane, and pilot scale operations using industrial ...


  • Ageing and Characterization of PES Ultrafiltration Membranes Exposed to Hypochlorite

    Polyethersulfone (PES) ultrafiltration (UF) hollow fibers are widely used for drinking water production. During onsite operation, backwashing (brief, high occurrence, low concentration in free chlorine: 10 ppm to 20 ppm) and chemical washing (longer, less frequent, high concentration in free chlorine: 200 ppm to 400 ppm) are applied to PES fibers to ensure their proper functioning. Impact of ...


    By IWA Publishing

  • 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 ...


    By IWA Publishing

  • The productive environmental laboratory: BSK Labs boosts efficiency with Metrohm IC

    BSK Labs runs a number of environmental laboratories and service centers along the west coast of the US. A total of 70 employees – including microbiologists, chemists, lab technicians, and support staff – make sure that the 200 to 350 samples that come in every week are analyzed. BSK Labs specializes in potable water chemistry, ground water monitoring, storm water runoff, solid waste ...


    By Metrohm AG

  • Influence of Operating Parameters on Ultrafiltration Membrane Dextran Rejection

    Abstract The Membrane Technologist today has a wide variety of ultrafiltration (UF) available as a repertoire for applications development. The concept of molecular weight cut-off (MWCO) can be arbitrary. The consequences of non-standard characterization protocols, differences in membrane morphology, generic polymer composition and the chemical nature of the MWCO test solute all ...


  • Contribution of different effluent organic matter fractions to membrane fouling in ultrafiltration of treated domestic wastewater

    In the present work, effluent organic matter (EfOM) in treated domestic wastewater was separated into hydrophobic neutrals, colloids, hydrophobic acids, transphilic acids and neutrals and hydrophilic compounds. Their contribution to dissolved organic carbon (DOC) was identified. Further characterization was conducted with respect to molecular size and hydrophobicity. Each isolated fraction was ...


    By IWA Publishing

  • Assessing irreversible fouling behavior of membrane foulants in the ultrafiltration of natural water using principal component analysis of fluorescence excitation-emission matrices

    Natural river water is comprised of different foulant components such as natural organic matter and colloidal/particulate matter. Both individual and combined contributions of these foulant components results in different fouling behaviour. The ability to characterize these contributions that lead to reversible and irreversible membrane fouling would be beneficial for the implementation of ...


    By IWA Publishing

  • Water Recovery from an Aluminum Can Manufacturing Process Using Spiral-Wound Membrane Elements

    Abstract A waste treatment unit has been designed to recover water and various components from an aluminum can manufacturing process. Due to the scarcity of water in the Middle East and its inherent cost, water recovery is both necessary and cost effective. The manufacturing process generates: 1) an 11,356 L/hr (50 gpm) aqueous stream contaminated with hydrofluoric acid, dissolved aluminum, and ...

  • Behaviour of Bulk and Trace Organics in a Full Scale Membrane Bioreactor for Landfill Leachate Treatment

    ABSTRACTLandfill leachates are generally highly pollutant wastewaters which have percolated through a deposit of solid waste. In many states it is now required to collect and treat landfill leachates to avoid contamination of surface and groundwater bodies. A state of the art technology for landfill leachate treatment uses membrane bioreactor technology prior to potential polishing with dense ...

  • Evaluating Spiral-wound Separator Performance

    Introduction The recent evolution of spiral-wound membrane element (sepralator) design brings an increased need to understand the intricacies of testing, operating and predicting performance of this most popular crossflow membrane design. After over a decade of stagnant development, the last five years have produced several innovations, which diversify and expand the applications as well as ...


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