Ultrapure Water Articles

  • Improving vacuum-UV (VUV) photolysis of organic compounds in water with a phosphor converted xenon excimer lamp emitting at 193 nm

    A novel vacuum ultraviolet excimer lamp emitting light at 193 nm was used to investigate the degradation of organic micropollutants in ultrapure water and wastewater treatment plant (WWTP) effluent. Overall, light at 193 nm proved to be efficient to degrade the investigated micropollutants (diclofenac, diatrizoic acid, sulfamethoxazole). Experiments with WWTP effluent proved the ability of ...


    By IWA Publishing

  • Recovery rate of multiple enteric viruses artificially seeded in water and concentrated by adsorption–elution with negatively charged membranes: interaction and interference between different virus species

    Viral concentration method by adsorption–elution with negative membranes has been widely employed for concentrating viruses from environmental samples. In order to provide an adequate assessment of its recovery efficiency, this study was conducted to assess viral recovery rates for viral species commonly found in water (HAdV-5, EV, RV, BAdV and CAV-2), quantifying viral genomes at the end of ...


    By IWA Publishing

  • Bulk nutritional supplements blended in pharmaceutical grade rotary mixer

    Daily Manufacturing, Inc. (www.daily-mfg.com) is a small, family oriented business committed to producing high quality nutritional products from natural sources such as vitamins and minerals, digestive aids ranging from activated charcoal to probiotics, herbs and special combinations of these ingredients. Founded in 1979 by James and Mary Jo Daily, the company ...

  • Electrodeionization - Ultrapure water

    Continuous Electrodeionization Process The continuous electrodeionization process (CEDI),  is a system that uses ion exchange resins and electricity  for the production of ultrapure deionized water without chemical processes and without production stops. SIMPEC uses modular systems for the electrodeionization processes. The CEDI modules are installed at the exit ...


    By SIMPEC S.r.l.

  • Experimental study of the degradation of 2,4-D induced by vacuum-UV radiation

    Vacuum-UV (VUV) photoinduced degradation of the herbicide 2,4-D was studied. A flow-through VUV photoreactor was used (i) in batch mode to study the kinetics of degradation and (ii) in continuous mode under steady state to analyze the potential utilization of this process in commercial applications. In both cases, the reactants were recycled to minimize diffusive resistances. Experimental results ...


    By IWA Publishing

  • Water matrix effect on UV photodegradation of perfluorooctanoic acid

    The widespread detection of perfluorinated compounds (PFCs) in the water environment has been a concern for the last several years, while effluents from wastewater treatment facilities are the major sources of these compounds. Even advanced oxidation technologies (AOTs) are not useful for mineralization of the compounds due to their very high stability. Photochemical techniques using particularly ...


    By IWA Publishing

  • Add polish to high purity water

    Electrodeionization (EDI) has recently gained widespread acceptance by water treatment companies and end users alike for almost all applications requiring high-purity water. EDI has proven to be a reliable, cost-effective solution for both end users and water treatment companies. End users purchasing capital equipment can eliminate on-site chemical regeneration. Water treatment companies selling ...


    By Agape Water Solutions, Inc.

  • Spiral wound electrodeionization

    Electrodeionization (EDI) is typically used in combination with RO systems to produce pure or ultrapure water, continuously and without chemicals. This combination eliminates the need for regeneration chemicals and the inherent cost, safety and inconveniences of storage, handling, treatment and discharge associated with ion exchange systems. Power plants, electronics manufacturers and ...


    By Agape Water Solutions, Inc.

  • Ultrapure Water: World Markets Report

    Provides continually updated analyses and forecasts of ultrapure water systems and a number of specific components and consumables such as resins for power, pharmaceutical, semiconductor, and other industries. Click here for ...


    By The McIlvaine Company

  • Water, Wastewater, and Filtration: World Markets Report

    Forecasts of the $183 billion market for water and wastewater treatment and filtration products and services including outsourcing. Also included are world forecasts for chemicals, cartridges, macro filtration, membranes, sedimentation, centrifugation, and ultrapure water ...


    By The McIlvaine Company

  • Analysis of impurities in ultrapure water by dynamic reaction cell ICP-MS

    Ultrapure Water (UPW) is used for the cleaning of instruments and containers in trace analysis and for dilution of samples. The analysis of impurities in UPW requires increasingly lower levels of detection and higher instrument productivity. SEMI Standard F63-03091 specifies a maximum contamination for metals of 0.02-0.1 ppb for each element for ultrapure water used in semiconductor processing. ...


    By PerkinElmer, Inc.

  • River water is filtered for use in an electronic disk manufacturing facility in Hokkaido, Japan

    New Logic International installed its Vibratory Shear Enhanced Processing (VSEP) Phase I system in July, 1997, and the Phase II system in August 1998 at a major international electronic disk manufacturing facility at Hokkaido Island located in Northern Japan. The VSEP is used for treatment of river water for ultrapure water production at this facility. The VSEP system uses an ultrafiltration ...


    By New Logic Research, Inc.

  • A high-performance electropositive filter

    Reverse osmosis (RO) membranes have become the industry standard for purification of any feed water source. They are used extensively for producing high-purity, low-conductivity process water. They are also used for producing ultrapure water from fresh water because RO is presumed to be the ultimate purifier. Because RO filters are readily fouled by colloidal particles and biofilms, some method ...


    By Argonide Corporation

  • UltraPure water: systems for microelectronics

    The burgeoning electronics industry Electronics are the heartbeat of the products and services of many industries – including aerospace, communications, entertainment, defence, and health – and, as a consequence, the global electronics market is valued at US$1 trillion worldwide. ...


  • Counting the whole life cycle cost of pure water production

    In this article we define various grades of pure water, review technologies available for its production, and describe two systems where various process combinations have been used to generate pure water for pharmaceutical and power generation applications. We ask Dr John Hutcheson, a specialist consultant in pure water systems, what costs are involved in pure water production and what ...


    By Clarity Authoring

  • The fundamental conductivity and resistivity of water

    Pure water has a very low. but not quite zero, electrical conductivity. This conductivity provides a probe into fundamental properties of water, including the electrochemical mobility of the hydrogen and hydroxide ions. Deviation from this value is a measure of trace ionic impurities. Ultrapure water (UPW). with impurities at or below the sub-parts-per-billion range, is used extensively in many ...


    By SnowPure Water Technologies

  • Meeting water quality specifications for 300 mm processing

    Abstract This paper reviews the historical ultrapure water specifications and compares them to the specifications for state of the art ...


  • 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, water has unique characteristics that result in its ability to dissolve most matter. This property of water to dissolve and transport materials is ...

  • 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 municipal supplies are imposed by the U.S. Environmental Protection Agency (EPA). To reduce the potential for the formation of THM's, many U.S. ...

  • Ultrapure water – The standard for resistivity measurements of Ultrapure water - Case Study

    Abstract For years, resistivity/conductivity2 instrumentation has been used as a reliable indicator of ionic water quality, especially for ultrapure water (UPW). Traditionally, the instrumentation is procured, installed, powered up, and perhaps connected to a PLC, strip chart recorder, or a LAN. After that, the instrument and sensor receive no attention until a problem arises. Today, ...


    By SnowPure Water Technologies

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