ultrafiltration membrane Articles

  • Factors affecting coagulation as a pretreatment to ultrafiltration membranes

    Low pressure membranes can be effective in treating various types of water, but are subject to fouling. In this work, chemical coagulation was studied as a pretreatment to ultrafiltration (UF), with the goal of mitigating fouling while maintaining high permeate water quality. Alum and ferric chloride were evaluated, as well as two polyaluminum chloride (PACl) products of different basicities ...


    By IWA Publishing

  • Effect of enhanced coagulation by KMnO4 on the fouling of ultrafiltration membranes

    Pre-coagulation enhanced by KMnO4 before ultrafiltration (KCUF) was compared with normal pre-coagulation by alum (CUF) in the ultrafiltration of water from the Songhua River, China. The trans-membrane pressure (TMP) with KCUF was much lower than that when alum alone was used. With KCUF a slower increment of TMP occurred, even under conditions of high river water turbidity. The results also showed ...


    By IWA Publishing

  • 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 ...


  • Development of antifouling ultrafiltration membranes by surface modification

    Poly(vinylidene fluoride) (PVDF) membranes were prepared by phase inversion technique. The effects of polystyrene (PS) concentrations on the blend membrane performance were investigated. The membranes were characterised in terms of shrinkage ratio, pure water flux, and porosity. The hydrophobicity of the membrane was modified by poly(vinyl alcohol) (PVA) through adsorption and crosslinking. The ...


    By Inderscience Publishers

  • Effect of functionalisation on polysulfone-based ultrafiltration membranes

    Polysulfone membranes possess excellent mechanical, biological and chemical stability but they suffer from fouling which leads to flux decline. Fouling can be minimised by functionalisation. In an attempt to overcome this limitation, the polysulfone was both sulphonated and carboxylated. The presence of sulphonic and carboxylic groups was confirmed through IR and NMR studies. Incorporation of ...


    By Inderscience Publishers

  • 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

  • Membrane fouling remediation in ultrafiltration of latex contaminated wastewater

    The current study aimed to remediate membrane fouling by latex effluent by altering membrane surface charge or ionic strength of the effluent. Hydrophilic polysulfone and Ultrafilic flat membranes, with molecular weight cutoff (MWCO) of 60,000 and 100,000, respectively, and hydrophobic polyvinylidene difluoride membrane (PVDF; MWCO 100,000) were used under a constant flow rate and in ...


    By IWA Publishing

  • Predictability of fouling-potential of raw water for ultrafiltration membranes

    The public drinking water supply of southern Germany is characterized by a rather decentralized network. Due to the hydrogeological setting in these parts of Germany many of the small water works with an average capacity of 50 m3/h have to treat raw water extracted from karstic or cliffy aquifers. These raw waters tend to be contaminated with particles and pathogens acquired during snowmelt or ...


    By IWA Publishing

  • MIEX® Pretreatment to Micro & UltraFiltration

    There are currently (in 2006) four full-scale membrane plants in operation where the MIEX® Process pre-treats water prior to the membrane process. Two plants use Microfiltration (MF) and two use Ultrafiltration (UF). This technical note highlights the benefits of MIEX® Treatment prior to MF and UF based on operating data and experience at these facilities. In particular, data is provided from the ...


    By IXOM Watercare

  • Membrane foulants and fouling mechanisms in microfiltration and ultrafiltration of an activated sludge effluent

    Membrane fouling in microfiltration (MF) and ultrafiltration (UF) of an activated sludge (AS) effluent was investigated. It was found that the major membrane foulants were polysaccharides, proteins, polysaccharide-like and protein-like materials and humic substances. MF fouling by the raw effluent was governed by pore adsorption of particles smaller than the pores during the first 30 minutes of ...


    By IWA Publishing

  • A pilot-scale study of backwashing ultrafiltration membrane with demineralized water

    This study investigates the effectiveness of different backwash waters on ultrafiltration (UF) fouling control on a pilot-scale setup. Surface water and ion exchange (IEX) pretreated surface water were used as feed water. Three backwash waters were tested: demineralized water, UF permeate and nanofiltration (NF) permeate. Results show that backwashing with demineralized water substantially ...


    By IWA Publishing

  • Biofilm formation and permeate quality improvement in Gravity Driven Membrane ultrafiltration

    The effects of biofilm development on ultrafiltration membranes with regard to permeate stability and permeation rates were investigated using Gravity Driven Membrane (GDM) filtration. The first part of the study aimed at evaluating the influence of the biofilm on permeate flux quality and quantity with regard to Assimilable Organic Carbon (AOC) degradation. In addition, two types of biological ...


    By IWA Publishing

  • PREFILTERS IN ULTRAFILTRATION PROCESSES

    AZUD HELIX AUTOMATIC filters are excellent protecting Ultrafiltration membranes. Their operation is based in the disc filtration technology, which supplies an in-depth filtration. The installation of AZUD HELIX AUTOMATIC filtration equipments as prefilters is one of its commonest applications. The installation of AZUD HELIX AUTOMATIC filtration equipment prior to the cartridge filters permits: ...


    By Sistema Azud, S.A.

  • Polyethersulfone/polyacrylonitrile blended ultrafiltration membranes: preparation, morphology and filtration properties

    Polyethersulfone (PES)/polyacrylonitrile (PAN) membranes have been paid attention among membrane research subjects. However, very few studies are included in the literature. In our study, asymmetric ultrafiltration (UF) membranes were prepared from blends of PES/PAN with phase inversion method using water as coagulation bath. Polyvinylpyrrolidone (PVP) with Mw of 10,000 Da was used as pore ...


    By IWA Publishing

  • Ceramic membrane ultrafiltration of natural surface water with ultrasound enhanced backwashing

    Ultrafiltration membrane cleaning with ultrasound enhanced backwashing was investigated with two ceramic membrane systems in parallel. One of them was subjected to ultrasound during backwashing, the other acted as a reference system. The feed water was directly taken from a creek with a sedimentation process as only pre-treatment. The cleaning performance was improved with ultrasound but after 3 ...


    By IWA Publishing

  • Evaluation of the efficiency of polysulfone ultrafiltration membrane-based water purifiers for microbiological decontamination

    Indigenously developed polysulfone Ultrafiltration (UF) membrane-based domestic and industrial water purification units were evaluated for their ability to filter bacteria and viruses from water. Escherichia coli (105 cfu/ml) and P1 phage (106 pfu/ml) were filtered through a Domestic Water Purifier (DWP) (dead-end UF unit) and a large-scale spiral water purifier (cross-flow UF unit) and the ...


    By Inderscience Publishers

  • QUA`s Q-SEP Ultrafiltration Membranes Utilized at Hinduja Power Plant

    Overview Visakhapatnam (also known as Vizag) is a city located in the state of Andhra Pradesh in India that has a growing need for a wider electricity network to serve its citizens and industrial activity. To address this need, Hinduja Power decided to build a 1040 MW coal fired power plant to provide power not only to Visakhapatnam, but also throughout the state and to other states in ...


    By QUA Group LLC

  • Immersed Ultrafiltration Membranes for Treatment of Organically Laden Surfice Water

    ABSTRACT Ultrafiltration membranes are becoming increasingly prevalent in potable water treatment applications. This trend can be attributed to the improved cost effectiveness of membrane systems as compared to conventional treatment technologies and to progressively more stringent water quality regulations. In particular, increased awareness related to the formation of disinfection ...

  • 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 ...


    By IWA Publishing

  • Fouling analysis of polysulfone ultrafiltration membranes used for drinking water treatment

    Natural organic matter (NOM) plays a significant role in the fouling of ultrafiltration membranes in drinking water treatment processes. For a better understanding of the interaction between fractional components of NOM and polysulfone (PS) ultrafiltration membranes used for drinking water treatment, fouling and especially the physically irreversible fouling of natural organic matter were ...


    By IWA Publishing

Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you