ro membrane Articles

  • Membrane Bioreactors for RO Pretreatment

    ABSTRACTCurrently, treated municipal wastewater is typically discharged to the environment in most parts of the world. It is, however, a potential water resource from which high quality water for reuse can be produced. Reuse applications include both non-potable applications such as irrigation and production of industrial process water, and indirect potable reuse including aquifer recharge. For ...

  • Death, Taxes . . . and RO Membrane Fouling

    Membrane fouling in reverse osmosis (RO) systems is as all pervasive and inevitable as the common cold. Avoidance is just as hit-or-miss: wash your hands, don't get your feet wet and hope for the best. The many unseen factors influencing whether a person becomes ill parallel the many variables that determine the onset and severity of fouling in a membrane system. Design, operation, and ...


  • INNOVATIVE CHEMICALS FOR DETERIORATED RO MEMBRANES

    The new rejuvenation chemical treatment is introduced in this paper. This chemical treatment repairs the deteriorated RO membranes, and recovers the salt rejection ratio immediately. In the past, such kind of rejuvenation methods have been developed and reported only with table test basis and pilot plant test basis as seen in the IVREFERENCES ...


    By Kurita

  • Self-Cleaning Pre-Filtration for RO Membrane Systems

    ABSTRACT A few years ago physical processes could only remove suspended solids from a water stream. Recent advances in technology now allow the removal of selected molecules and ions from a water stream by physical means using membranes. The membrane process has recently become very efficient and economically feasible for many industrial, commercial, municipal and even residential customers. ...

  • 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 ...

  • Safe use of microbubbles for removal of RO membrane fouling

    Abstract The authors have shown a dramatic improvement in cleaning efficiency when effervescent cleaning reagents are used in conjunction with bubbles created using a specially designed microbubble generator. One potential problem associated with this new technique is that the bubbles will cause damage to the delicate polyamide layer and other structures in the RO element. In order to ...

  • YWP Weinrich perspective on RO membrane biofouling reduction

    Seawater desalination using reverse osmosis is an important part of a community’s water portfolio in coastal areas experiencing water scarcity. However, desalination using RO is expensive in part because of the costly challenges that arise from fouling on the RO membranes. Specifically, biological fouling emerged as the most poorly managed of the different types of fouling. My literature ...


    By IWA Publishing

  • 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 ...

  • Efficiency of RO/NF membranes at the removal of veterinary antibiotics

    The production of pharmaceuticals has increased rapidly during the last several decades as they have been used for the health of both humans and animals. Routes of environmental exposure include the release of treated wastewater, the land disposal of livestock manures and municipal biosolids (i.e. sewage sludge), as well as the use of medicated aquaculture feed. This study deals with application ...


    By IWA Publishing

  • Genairclean RO membrane cleaning - Case Study

    Trial Period September 2013 to May 2014 Site Water Reuse system, UK Background A Brackish Water Reverse Osmosis (BWRO) system with a history of rapid and consistent membrane fouling was selected to trial the new ‘Genairclean’ micro-bubble multi-mechanism RO membrane cleaning method. The plant reclaims process ...

  • RO Feedwater: Treat It Right

    Summary Crossflow membrane filtration systems, such as reverse osmosis (RO), nanofiltration (NF) or ultrafiltration (UF), are good alternatives to traditional filtration and chemical treatment. However, to get the best performance from them, careful attention must be paid to feedwater conditions. Pretreating feedwater can lengthen the life of membrane elements, improve the quality of the ...

  • Principle of Reverse Osmosis (RO)

    Osmosis  Osmosis is a phenomenon where pure water flows from a dilute solution through a semi permeable membrane to a higher concentrated solution. Semi permeable means that the membrane will allow small molecules and ions to pass through it but acts as a barrier to larger molecules or dissolved substances. To illustrate this, assume that a semi permeable membrane is placed between two ...


    By Toray Membrane Europe

  • Features of Reverse Osmosis (RO)

    1. Removal of dissolved salts  Reverse osmosis can stably and effectively remove dissolved salts, dissolved organic substances (trihalomethane, its precursors, agricultural chemicals, etc.), and micro fine particles (living germs, dead germs, and many other micro fine particles) from water. Thus it is ideal for a wide area of applications ranging from production of ultra pure water to ...


    By Toray Membrane Europe

  • RO membrane cleaning past, present, future - innovations for improving RO plant operating efficiency

    Abstract This paper reviews current thinking on reverse osmosis (RO) membrane cleaning. It challenges preconceptions and describes novel approaches for the removal of foulants and scale deposits from membrane surfaces. Applying membrane cleaning early in the fouling process before deposits can become compressed is advocated. Waiting until membranes are so fouled that they have a drop ...

  • Alternative water supply and treatment solutions in Durban (SA)

    As a result of persistent drought conditions in South Africa a customer (an international consumer goods producer with a production facility in Durban) experiences the pressure of limited availability of water. The ever dropping dam levels currently result in higher risk for intermittent water supply resulting in unplanned and forced production stops in case no water is available. Aquest Colsen ...


    By Colsen International b.v.

  • 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

  • Self-Cleaning Pre-Filtration for RO and Other Membrane Systems

    Abstract A few years ago physical processes could only remove suspended solids from a water stream. Recent advances in technology now allow the removal of selected molecules and ions from a water stream by physical means using membranes. The membrane process has recently become very efficient and economically feasible for many industrial, commercial, municipal and even residential customers. ...

  • High performance RO membranes for desalination and wastewater reclamation and their operation results

    Reverse osmosis (RO) membrane is one of the most powerful tools for solving the global water crisis, and is used in a variety of water treatment scenes such as drinking water purification, waste-water treatment, boiler feed water production, ultra pure water production for semiconductor industry, etc. The desired performance of RO membrane varies according to quality of feed water being treated, ...


    By IWA Publishing

  • Organic fouling development in a long channel RO membrane cell

    This study was to experimentally investigate organic fouling development in a 1-m long RO membrane channel using alginate as a model organic compound. Five parallel local permeate fluxes with a distance interval of 20 cm along the channel were monitored continuously during the organic filtration tests. It was found that organic fouling became more severe towards the outlet of the channel. This ...


    By IWA Publishing

  • Microbubble RO membrane cleaning reduces fouling on WWRO plant.

    Over the last ten years there have been significant developments in new devices for energy recovery, new membrane materials, and new sizes and orientations of reverse osmosis (RO) plants, all designed to reduce costs and improve efficiency. The fundamental issue of keeping membrane surfaces clean to ensure efficient RO plant operation has seen relatively few recent developments. This is ...

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