34 Articles found

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  • Long Term Experience with Hollow Fibre Membrane Bioreactors

    Long Term Experience with Hollow Fibre Membrane Bioreactors

    Abstract The membrane bioreactor (MBR) technology has been proven as a single step process to treat wastewater and produce an outstanding effluent quality suitable for reuse, either directly or as a pretreatment to reverse osmosis. While it is ...

    Andrew Benedek and Pierre Côté

  • Reuse of Municipal/Industrial Secondary Eflluent for Water Reuse

    Reuse of Municipal/Industrial Secondary Eflluent for Water Reuse

    Abstract This paper presents results from pilot and demonstration studies conducted over the past two years at various locations around the world. All studies were conducted on municipal secondary effluent. Data includes: feed water quality, ...

    Doug Thompson, P.E., Diana Mourato, Ph.D., Cory Schneider, P.E.

  • Immersed Ultrafiltration Membranes for Treatment of Organically Laden Surfice Water

    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 ...

    S. Rambié, B. Sc. (Eng); G. Best, P. Eng.; S. Kroll

  • Membrane and System Design Considerations in Producing High Purity Water

    Membrane and System Design Considerations in Producing High Purity Water

    The use of membrane technology to produce water of greater and greater purity is rapidly evolving under the pressure of new product quality specifications, including those of the pharmaceutical and beverage industries. Membrane technology is well ...

    Nancy Mulhern

  • A Discussion on Ozone Chemistry

    A Discussion on Ozone Chemistry

    MEMBRANE AND APPLICATION DEVELOPMENT 1.0 INTRODUCTION The ability of ozone to effectively treat wastewater is dependent on the nature of contaminant in question. For example, ozone will readily remove color from a dye solution, but has much more ...

    Steven D. Kloos

  • Advanced Water Treatment Technologies May Bring Purified Water to San Diego

    Advanced Water Treatment Technologies May Bring Purified Water to San Diego

    `In four years, half of San Diego may be filling its glasses with tap water that once ran through its toilets,` reported the San Diego Union-Tribune recently. A plan to mix `repurified water` with the City`s raw drinking water reservoir could become ...

    Inge Bisconer

  • Chloramines

    Chloramines

    OVERVIEW When chlorine is added to a water supply containing certain organics, the formation of halogenated organics occurs. Called `trihalogenated methanes` (THM`s) these reaction products are suspected carcinogens and maximum allowable limits in ...

    Gerard J. Gash

  • Chlorine

    Chlorine

    Due to the complexity of chlorine chemistry, the activity and forms of chlorine is not well understood. Its reactions are not always `predictable` and are somewhat unique. This memo is intended to provide some simple insight of the most common forms ...

  • A Case for Point-of-Use RO Ultrapure Water Systems

    A Case for Point-of-Use RO Ultrapure Water Systems

    ULTRAPURE WATER CRITERIA - AN OVERVIEW `Pure water` is a relative term. Practically speaking, no water, naturally occurring or treated by man, consists solely of H2O molecules. Forever in pursuit of achieving equilibrium with its surroundings, ...

    Gerard J. Gach; David J. Paulson; D. Dean Spatz

  • Basic Principles of Microfiltration

    Basic Principles of Microfiltration

    Microfiltration can be defined as the separation of particles of one size from particles of another size in the range of approximately 0.01 µm through 20 µm. The fluid may be either a liquid or a gas. Microfiltration media are available in a wide ...

  • Memtrex-PC Polycarbonate Cartridge Filter

    Memtrex-PC Polycarbonate Cartridge Filter

    Producing the Membrane The polycarbonate track-etch (PCTE) membrane filters are precision, two-dimensional microporous screens. As in the case of other screens, particle capture takes place on the surface. Compare this to ordinary cast membrane ...

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

    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 ...

    David Paulson; Kenneth Jondahl

  • Water Recovery from an Aluminum Can Manufacturing Process Using Spiral-Wound Membrane Elements

    Water Recovery from an Aluminum Can Manufacturing Process Using Spiral-Wound Membrane Elements

    Abstract A waste treatment unit has been designed to recover water and various components from an aluminum can manufacturing process. Due to the scarcity of water in the Middle East and its inherent cost, water recovery is both necessary and cost ...

  • Immersed Membrane Technology for Advanced Wastewater Treatment & Water Reuse

    Immersed Membrane Technology for Advanced Wastewater Treatment & Water Reuse

    A significant segment of the North American population is unserviced by municipal wastewater systems and, with the seemingly, unending growth of residential communities, commercial complexes, industrial parks and support infrastructure, this ...

    James W. Hotchkies

  • Explore the capabilities of nanofiltration and ultrafiltration. Filters have similar looks, different applications

    Explore the capabilities of nanofiltration and ultrafiltration. Filters have similar looks, different applications

    Introduction Even if you’re an expert in reverse osmosis (RO) membrane technology, you may be overlooking some applications using often neglected cousins of RO: nanofiltration (NF) and ultrafiltration (UF). Although virtually identical in looks ...

    Inge Bisconer

  • Understanding Pump Cavitation

    Understanding Pump Cavitation

    Cavitation is a major problem in the chemical industry because it affects a basic tool, the centrifugal pump. A sudden increase in the velocity of the pumped liquid reduces the inlet pressure, sometimes below the vapor pressure.The result is ...

    W.E. Nelson

  • Ozone Brings Better Bottled Water

    Ozone Brings Better Bottled Water

    The proliferation of bottled beverages worldwide and an increased awareness of consumer health issues have beverage bottlers rethinking how to keep their liquids safe for consumption. One problem they face is the need to deliver a product that is ...

    John Overby; John Overby

  • Pharmaceutical: a Practical Approach to Controlling Microbial Growth in USP

    Pharmaceutical: a Practical Approach to Controlling Microbial Growth in USP

    The control of microbial growth in systems for producing United States Pharmacopeia (USP) Purified Water is of critical importance to pharmaceutical manufacturers. It is also of critical importance to the United States Pharmacopeial Convention Inc. ...

    Angela Weitnauer

  • Reverse Osmosis for WFI and PW

    Reverse Osmosis for WFI and PW

    The United States Pharmacopeial Convention Inc. (USP) has proposed new specifications for Water for Injection (WFI) and Purified Water (PW). These specifications will include quantitative conductivity, and total organic carbon (TOC) measurements ...

    Angela Weitnauer; Lee Comb

  • Drinking Water Aesthetics Improve with Ozone Treatment

    Drinking Water Aesthetics Improve with Ozone Treatment

    High quality water sources for municipal use are dwindling, forcing utilities to seek alternate water sources. Many times, aesthetics are the only problem preventing the use of these alternate water sources for potable purposes. Although typically ...

    Paul Overbeck