membrane failure Articles

  • Problems of operation and main reasons for failure of membranes in tertiary treatment systems

    Abstract This paper presents and discuss the results of the long term operation and monitoring of membrane fouling at several full-scale MF/RO water recycling facilities operated by Agbar in Spain. It was demonstrated that membranes are very reliable treatment enabling the production of high-grade recycled water, well disinfected and with the removal of all priority substances. The ...

  • South Africa`s fuel cell plan risks failure without support

    An ambitious strategy to create fuel cell products for export will need incentives and cross-government backing to bear fruit, says Radhika Perrot. South Africa's Department of Science & Technology (DST) has been laboriously pushing for the development of hydrogen fuel-cell technology through an ambitious ...


    By SciDev.Net

  • Results from 99 seawater ro membrane autopsies

    Abstract This paper presents results from 99 sea water reverse osmosis (SWRO) membrane autopsies carried out by the Genesys laboratory in Madrid from 2002 and outlines the technical issues surrounding fouling and scaling of sea water membranes. The authors discuss historical results of membrane autopsies and link recent trends and changes in plant design to potential fouling and ...

  • Chlorination Disinfection Requirements for Membrane Bioreactor Permeate

     ABSTRACT The membrane bioreactor (MBR) process is typically designed and operated to produce a fully nitrified, high quality effluent (permeate) that makes it possible to use free chlorine for disinfection. In California, regulations (Title 22) require a minimum CT value of 450 mg-min/L or 5-log virus inactivation when chlorine is used to produce “disinfected tertiary effluent.” In ...

  • Suitability of cationic flocculants for RO membranes performance improvement

    Abstract As it has already been published and demonstrated, one of the main causes of membranes failures is related to a poor plant pre-treatment. Data from more than 600 autopsies demonstrated that both biofilm and colloidal matter are the most common components on RO (reverse osmosis) membranes fouling, therefore, main lack on membranes pre-treatment is related to disinfection and ...

  • Removing biofilm from membranes – a practical approach

    Abstract Within the lifetime of most reverse osmosis (RO) systems some fouling will adversely affect membrane performance.One of the major foulants identified on lead membranes during a decade of membrane autopsy at the Genesys Membrane laboratory is biological fouling (biofouling). All raw water sources contain microorganisms such as algae, bacteria and fungi. They also contain ...

  • New treatment plant to feature ceramic membranes

    The Parker Water and Sanitation District (PWSD) in Colorado has contracted for a membrane treatment system for its Rueter-Hess water treatment plant project. The new plant will treat water from the Rueter-Hess Reservoir (RHR), which is being built three miles southwest of downtown Parker on Newlin Gulch, which is a tributary drainage of Cherry Creek. The reservoir and associated treatment plan ...


    By PennWell Corporation

  • Application of Membrane Technology for the Recovery and Reuse of Water

    Abstract As water and sewer costs are expected to increase over the next decade, membrane technology will continue to be a viable and economical option in the recovery and reuse of water. This paper describes the mechanism of membrane effected separation (specifically reverse osmosis, ultrafiltration and microfiltration), membranes commercially available, membrane element configurations, and how ...


  • A study of the physical and chemical damage on reverse osmosis membranes detected by autopsies

    Abstract Water treatment by reverse osmosis technology has as main aim to reject the maximum percentage of ions from raw water, giving as much treated water flow as possible. When there is a loss in these two parameters performance, it is essential to find the source of the failure, in order to use the necessary tools for its recovery. At this point, membrane autopsies are a very ...

  • Application of chlorine resistant polyamide RO membrane for household water filtration device

    Chlorine attacks the polyamide RO membrane to cause membrane failure as measured by enhanced passage of both salt and water. For this reason, activated carbon pre-filters that remove chlorine are typically placed ahead of RO membranes in home drinking water treatment RO system. A general home drinking water treatment system employing RO is composed of preliminary sediment filter, activated carbon ...


    By Toray Chemical Korea

  • Treatment of kraft evaporator condensate using a thermophilic submerged anaerobic membrane bioreactor

    The feasibility of using a thermophilic submerged anaerobic membrane bioreactor (SAnMBR) for kraft evaporator condensate treatment was studied at 55±1°C over 6.5 months. Under tested organic loading rate of 1–7 kg COD/m3 day, a soluble COD removal efficiency of 85–97% was obtained. The methane production rate was 0.35±0.1 L methane/g COD and the produced biogas was of excellent fuel quality with ...


    By IWA Publishing

  • Integration of nitrification and denitrification by combining anoxic and aerobic conditions in a membrane bioreactor

    A membrane bioreactor (MBR) was developed to achieve nitrogen removal by combining nitrification and denitrification conditions in one reactor. The activated sludge was alternated between aerobic and anoxic conditions using peristaltic pump. The biomass concentration and floc morphological properties were observed to be similar in anoxic and aerobic compartments. However, the homogeneous ...


    By IWA Publishing

  • Membrane filtration of municipal wastewater effluents for implementing agricultural reuse in southern Italy

    Membrane filtration was investigated at field scale in order to assess its effectiveness for reusing municipal effluents in agriculture. The study was started on April 2002 and ended on September 2007, as part of a national R&D project (AQUATEC). Preliminary results, which we already reported elsewhere, concerned the first two project years while this paper refers to the subsequent period. Three ...


    By IWA Publishing

  • Mechano-chemical ageing of PES/PVP ultrafiltration membranes used in drinking water production

    In water treatment by microfiltration and ultrafiltration, a major concern is the integrity loss or failure of membrane induced by onsite operations, potentially leading to permeate water contamination. This study aims to provide a better understanding of the phenomena responsible for membrane damage by analyzing its causes and effects. The role of sodium hypochlorite exposure conditions and the ...


    By IWA Publishing

  • Conception and optimization of a membrane electrode assembly microbial fuel cell (MEA-MFC) for treatment of domestic wastewater

    A membrane electrode assembly (MEA) for microbial fuel cells (MEA-MFC) was developed for continuous electricity production while treating domestic wastewater concurrently. It was optimized via three upgraded versions (noted α, β and γ) in terms of design (current collectors, hydrophilic separator nature) and operating conditions (hydraulic retention time, external resistance, aeration rate, ...


    By IWA Publishing

  • Puraflex Design and Installation Instructions

    In order to produce an effective barrier to contamination, any membrane must be installed properly by personnel familiar with the material.  Any defects in jointing or preparation of the sub-base could damage the integrity of the lining system and ultimately lead to barrier failure. ITP LTD's Design and Installation Guide describes the quality control measures, earthworks/ground preparation, ...

  • Nanofiltration: properties and uses

    Untitled Document Koch Membrane Systems' Henia and Jorge Yacubowicz outline the uses and benefits of nanofiltration. ...

  • KLa Slot Injector™ Aeration System Expands the Capacity of an SBR at a Landfill Leachate Treatment Facility

    The Challenge A landfill had an existing single basin SBR plant to process the leachate which is notable for its high nitrogen load. The original system was installed with a fine pore diffuser aeration system and due to the chemical/biological composition of the mixed liquor it was prone to diffuser fouling and premature membrane failure Over time this was detrimental to the biological process ...


    By KLa Systems, Inc.

  • Dallas eastside water treatment plant, Dallas, Texas

    In 1996, consulting engineers under con-tract to the City of Dallas contacted Soil Stabilization Products Company Inc. (SSPCo) to discuss solutions for chronic problems caused by more than a dozen sliding failures per year on the outer slopes of a water treatment facility's lagoon. The facility, administered by Dallas Water Utilities, consisted of a series of water retention lagoons enclosed ...


    By Presto Geosystems

  • Reverse Osmosis Technology – KURIVERTER RC - Case Study

    Summary Applications using Reverse Osmosis membrane technologies are everywhere in our lives – from tiny under counter units polishing our drinking water through industrial units preparing water for processes or purifying effluents for reuse and massive seawater desalination plants producing thousands of m³ of drinking and irrigation water every day. The membranes used in this ...


    By Kurita

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