reverse osmosis membrane Articles

  • Evaluating impact of fouling on reverse osmosis membranes performance

    Abstract Membrane fouling is commonly defined as an undesirable formation of deposits on mem- brane surfaces and it is considered a major problem in most brackish, seawater, and waste water reclamation applications. Depending on nature of the scale and foulant, fouling pro- cesses will lead to decreased membrane fluxes, increased pressures needs, and/or increased permeate conductivity. ...

  • Innovations in the inhibition of reverse osmosis membrane scaling and fouling

    Abstract: Scaling and fouling of membranes is an on-going performance issue for most plants. There are continual improvements in membrane technology and plant design which increase efficiency, water quality and utilise different raw water supplies to produce clean pure water. This presentation outlines innovations in laboratory services and speciality chemicals designed to inhibit membrane ...

  • CSM fouling resistant reverse osmosis membranes

    This paper particularly deals with new fouling resistant RO membranes which are made more hydrophilic and less changed or charged with the same charge as the foulants to reduce hydrophobic interaction and charge attraction or to increase charge repulsion, respectively. The fouling resistant membranes manufactured by Woongjin Chemical in Korea are coated with hydrophilic monomers followed by ...


    By Toray Chemical Korea

  • Modification of a polyamide reverse osmosis membrane by heat treatment for enhanced fouling resistance

    The use of heat treatment to improve solute rejection and fouling resistance of a polyamide reverse osmosis (RO) membrane was investigated in this study. Heat treatment was carried out by immersing the membrane samples in Milli-Q water at 70 °C for a specific duration. Heat treatment (24 h) reduced the pure water permeability from 4.1 to 2.8 L/m2hbar but improved conductivity rejection ...


    By IWA Publishing

  • Control of metal oxide fouling in reverse osmosis

    High levels of iron and manganese, along with large quantities of dissolved gases in the wells created concern for the viability of a conventional desalination design for the proposed City of Camarillo groundwater desalination facility. To identify viable pre-treatment process(es) for the control of metal oxide fouling in reverse osmosis, a 12-month pilot study was undertaken. The pilot study ...


    By Toray Chemical Korea

  • Electronic Water Treatment Reduces Fouling In Reverse Osmosis

    Reverse Osmosis (RO) is used in processes requiring high-quality, purified water, such in semi-conductor processing or biochemical applications and can be used to treat boiler feed water, industrial wastewater or process water. A water purification technique, it reduces the quantity of dissolved solids in solution. RO uses waterline pressure together with energy consuming pressurizing pumps that ...

  • Control of metal oxide fouling in reverse osmosis

    High levels of iron and manganese, along with large quantities of dissolved gases in the wells created concern for the viability of a conventional desalination design for the proposed City of Camarillo groundwater desalination facility. To identify viable pre-treatment process(es) for the control of metal oxide fouling in reverse osmosis, a 12-month pilot study was undertaken. The pilot study ...


    By Toray Chemical Korea

  • Forward osmosis membrane fouling and cleaning for wastewater reuse

    Membrane fouling properties and different physical cleaning methods for forward osmosis (FO) and reverse osmosis (RO) laboratory-scale filtration systems were investigated. The membrane fouling, with respect to flux reduction, was lower in FO than in RO when testing an activated sludge effluent. Cross-flow velocity, air-scouring, osmotic backwashing and effect of a spacer were compared to ...


    By IWA Publishing

  • Biological filtration of poor quality brackish water reducing Reverse Osmosis membrane fouling

    Abstract A primary limitation in applying Reverse Osmosis (RO) is loss of performance caused by membrane fouling resulting from compounds that bacteria can use as energy or nutrient sources. When these compounds enter RO membranes, they are capable of sustaining extensive bacterial growths on the membrane sheets as well as within feed channel spacers. This leads to the entrapment of ...


    By Filtralite - Leca Norge As

  • Effects of tannic acid on membrane fouling and membrane cleaning in forward osmosis

    The fouling behavior during forward osmosis (FO) was investigated. Tannic acid was used as a model organic foulant for natural organic matter analysis since the main characteristics are similar, and calcium ions were added at different concentrations to explore the anti-pollution capability of FO membranes. The initial permeate flux and calcium ions strength were varied in different operating ...


    By IWA Publishing

  • Controlling biofouling of reverse osmosis membranes through surface modification via grafting patterned polymer brushes

    Thin film composite (TFC) polyamide membranes are extensively used as selective barriers in reverse osmosis processes. The major challenge faced with TFC membranes is significant fouling on the surface, which restricts the overall purification performance. To address the fouling problem, we developed novel fouling-resistant surface coatings via polyelectrolyte [poly(allylamine ...


    By IWA Publishing

  • Effect of pH level and acid type on total ammoniacal nitrogen (TAN) retention and fouling of reverse osmosis membranes processing swine wastewater

    Wastewaters fed to reverse osmosis (RO) membranes sometimes need to be acidified to prevent inorganic fouling and increase total ammoniacal nitrogen (TAN) retention. In this project, the effect of pH level (6.5–7.1) and acid type (HCl vs. H2SO4) on membrane fouling and cleaning as well as permeate flux and quality during the processing of swine wastewater with a spiral-wound RO membrane ...


    By IWA Publishing

  • Optimization of direct-osmosis–high-salinity cleaning for reverse osmosis fouling control in water reuse

    This paper focuses on the systematic approach adopted towards optimizing the salt consumption when using direct-osmosis–high-salinity (DO-HS) cleaning method for RO membranes in water reuse application. Trials were carried out on a pilot RO system with a capacity of 50 m3/day. Initially, proof of concept for the DO-HS method in water reuse application was established wherein the profile of ...


    By IWA Publishing

  • Study of fouling in two-stage reverse osmosis desalination unit operating without an inlet pH adjustment: diagnosis and implications

    In the current work, the diagnosis of a reverse osmosis desalination unit is reported. Over the two last decades, the studied desalination unit was supplying a 1,200 bed hotel. The feed water was driven from a well near the sea. The desalination unit has two stages giving an average recovery equal to 81%. The behaviour of all water streams with respect to aggressiveness and scaling tendency ...


    By IWA Publishing

  • Preliminary study on novel backwash cleaning for reverse osmosis fouling control in water reuse

    We have demonstrated a novel backwash cleaning technique of direct osmosis (DO)-high salinity (HS) for reverse osmosis (RO) fouling control in water reuse. An UF-RO pilot system was continuously (24-h) operated on site with the secondary effluent as the feed over 4 months. The RO plant was run at 75% recovery and at the membrane flux of 17 l m−2 h−1 (LMH) to simulate the full scale NEWater ...


    By IWA Publishing

  • RO Pretreatment Hydrocarbon Engineering - Optimisations of Osmosis

    Desalination by reverse osmosis (RO) is a fast growing technology, which is gaining more and more market share in the field of desalination applications. RO plants are able to produce extremely pure water with minimal impurities, even if they are charged with highly contaminated feed water. Based on the fact that the RO membranes themselves are able to separate the smallest ions out of the raw ...


    By Kurita

  • Application of the membrane fouling simulator to determine biofouling potential of antiscalants in membrane filtration

    In treatment of groundwater with reverse osmosis, the applied antiscalant can significantly contribute to the formation of biofouling, especially when legislation enforces the use of biodegradable, phosphorous-free products. As an alternative to extensive piloting, the use of the membrane fouling simulator (MFS) is proposed here to assess the biomass growth potential of different antiscalants. ...


    By IWA Publishing

  • Real-Time Membrane Fouling Monitoring

    The Port Hueneme Water Agency (PHWA) has been operating a municipal drinking water treatment plant designed to be a Brackish Water Reclamation Demonstration Facility. The facility consists of 3 separate side-by-side full scale systems or trains, each representing a major membrane separation process: nanofiltration (NF), reverse osmosis (RO) and electro dialysis reversal (EDR). Both the NF and RO ...


    By MASAR Technologies, Inc.

  • 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 ...


  • Software warns of early membrane fouling

    A software system known as MASAR – Membrane Alarm System and Automated Reporter, is proving to be a valuable tool for monitoring and optimizing membrane – based water purification and desalination plants. It can detect the early development of membrane fouling/scaling in RO, NF, UF and MF systems by monitoring performance and measuring an early-warning parameter called the Fouling ...


    By MASAR Technologies, Inc.

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