water pretreatment 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 ...

  • Advanced Oxidation Pretreatment

    The MIEX®DOC Technology was designed for the removal of dissolved organic carbon (DOC), a precursor to the formation of THMs and HAAs, from drinking water supplies. More recently, the MIEX® Technology is finding many more applications for the removal of a range of contaminants across many industries. Occasionally, there are waters where the removal of DOC or other dissolved organic compounds ...


    By IXOM Watercare

  • 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

  • Pretreatment Requirements for Membrane Bioreactors

    Adequate pretreatment including fine screening is essential to the stable, long-term operation of membrane bioreactors (MBR) used to treat municipal wastewater. The amount of screenings generated by a screen with 1-2 mm size openings ranges between 10-25 dry mg/L. The cost of fine screening represents less than 3% of the total investment cost for a MBR-based wastewater treatment facility. Case ...

  • Ozonation Pretreatment to MIEX® Process

    The MIEX®DOC process is a proven technology for the removal of dissolved organic carbon (DOC) from potable and wastewater sources. Occasionally, waters are found to contain an intractable fraction of organic carbon and in such instances, the performance of the MIEX®DOC technology can be enhanced with ozonation. Ozonation is believed to be effective in partially oxidizing organic material and ...


    By IXOM Watercare

  • A Membrane Pretreatment Technology

    Nearly all membrane systems, no matter what their raw water source, must utilize some form of pretreatment to remove unwanted organic and inorganic suspended solids. Bag and cartridge filters are efficient at removing suspended solids but must be replaced on a frequent and often costly basis. Some form of suspended solids removal system that cleans itself, maintains high flow rates and stays ...

  • Cottonwood power – ultrafiltration pretreatment of a problem water

    The Facility The Cottonwood Power Project is one of the first United States power plant projects for InterGen, a joint venture between Houstonbased firms Shell Oil Co. and Bechtel Corp. Located in Deweyville, Texas along the Texas-Louisiana border, the plant is a natural gas fired, four-unit combined cycle facility capable of producing 1,230 megawatts of power. The ...

  • Dependable Pretreatment for UF Membrane Water Treatment System

    Lake Forest is a small upper class community along the west shore of Lake Michigan about 35 miles north of downtown Chicago, IL. In 1890 a group of residents started the Lake Forest Water Company on the present site to provide water for the residents of the community. Prior to the spring of 2004, the Lake Forest Water Plant provided traditional water treatment. Coagulating chemicals were added to ...

  • Monitoring and Controlling Pretreated Liquid Waste

    Intelligent dataTaker System Handles All Data Collection CAS DataLoggers has just provided an intelligent data logger for a manufacturer facing stringent environmental regulations requiring them to continuously monitor and manage their effluent disposal. Before effluent is discharged from the facility, it had to be heavily ...


    By CAS DATALOGGERS

  • Case study: Innovative portable package wastewater treatment plants

    DEVISE ENGINEERING S.A. has designed, engineered and is currently producing a new series of State of the Art Portable Sewage Treatment Plants (PSTP), incorporating advanced Ultra-Filtration (MBR) technology. These Plants are used for multiple “emergency” & “short-term” purposes with the ability to re-use the treated effluent. The particular Portable STP can be easily ...


    By DEVISE ENGINEERING S.A.

  • Pretreatment option to ensure longer ro membrame life

    Much like death and taxes, reverse osmosis membrane fouling is inevitable. However, there are preventative measures that can be taken to minimize scaling and fouling that will ensure longer reverse osmosis membrane life. REVERSE OSMOSIS Reverse osmosis (RO) involves forcing water through a semi-permeable membrane under high pressure, leaving the dissolved salts and other solutes behind on ...


    By Eco-Tec Inc.

  • Benefits of a BaySaver Separation System for Wet Pond Pretreatment

    There are instances when a BaySaver Separation System may be used as a pretreatment device for a wet pond; when environmental regulations require it; or when a stand alone physical separator is not enough to meet an 80% removal efficiency using solely this product. There are cost benefits associated with using BaySaver products in conjunction with other Best Management Practices (BMPs). In the ...


    By BaySaver Technologies, Inc.

  • Membrane pretreatment and cleaning – mixed oxidants in practice

    The prevalence of membrane filtration is rapidly growing in both the municipal and industrial water sectors. As membrane chemistries improve, so too do operational capacities and process requirements. Two main activities that contribute to membrane efficiency and lifetime are membrane pretreatment and membrane maintenance. Maintenance may be further differentiated into periodic backwashing and ...


    By MIOX Corporation

  • Mixed oxidants aid in membrane pretreatment, cleaning

    The prevalence of membrane filtration is rapidly growing in both the municipal and industrial water sectors. As membrane chemistries improve, so do operational capacities and process requirements. Two main activities that contribute to membrane efficiency and lifetime are membrane pretreatment and membrane maintenance. Maintenance may be further differentiated into periodic backwashing and ...


    By MIOX Corporation

  • Impact of a natural coagulant pretreatment for colour removal on solar water disinfection (SODIS)

    Solar water disinfection (SODIS) is the process of treating microbiologically contaminated water in clear plastic bottles through exposure to sunlight. One of the major limiting factors of this treatment is source water quality. This work investigates the impact of source water colour on SODIS efficiency and evaluates a natural coagulant for colour removal. The ability of Moringa oleifera seed ...


    By IWA Publishing

  • An evaluation of MBR and conventional pretreatment for reverse osmosis for water reclamation

    Two wastewater polishing systems were compared in terms of their ability to protect downstream reverse osmosis (RO) processes. A conventional full-scale wastewater treatment system with primary and secondary treatment followed by rotating biological contactors (RBC) and sand filtration were compared in a side-by-side study with a pilot-scale membrane bioreactor (MBR). Effluent from the two ...


    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

  • Biofiltration of hydrophobic VOCs pretreated with UV photolysis and photocatalysis

    The effects of pretreatments on the biofiltration of gas phase α-pinene, a poorly water soluble Volatile Organic Compound (VOC), was evaluated in a controlled and long-term experimental investigation. Ultraviolet (UV) photolysis and photocatalysis were used and compared as pretreatment techniques. A control experiment involving biofiltration alone allowed for the direct evaluation of the coupled ...


    By Inderscience Publishers

  • 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

  • Self-Cleaning Filtration for Pretreatment of Membrane, UV and Ozone Water Treatment Systems

    Recent field data has shown the effectiveness of automatic self-cleaning filters in removing suspended solids down to less than 3 microns in size without flocculents, pre-coats or granulated media. Pre-treatment of ozone systems is often needed to remove organic solids that would utilize high amounts of ozone during oxidation leaving little for complete disinfection. Selfcleaning screen filters ...

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