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

  • Removal of bromide and bromate from drinking water using granular activated carbon

    Granular activated carbon (GAC) was used to remove bromide (Br−) and bromate (BrO3−) from drinking water in both bench- and pilot-scale experiments. The present study aims to minimize BrO3− formation and eliminate BrO3− generated during the ozonation of drinking water, particularly in packaged drinking ...


    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 ...

  • Kurita chemical deal solves sales dilemma

    The Japanese company has drastically ramped up its presence abroad with its first foreign acquisition in 16 years. The European sales boost will see the overseas chemicals business streak ahead of the facilities division. Kurita Water Industries has made a crucial step away from a sluggish home market in Japan with its first overseas acquisition since buying Hansu Technical Service in 1998. It ...


    By Kurita

  • EDI for Power Plants -- Importance of silica

    Power plants use high purity water to drive steam turbines. Cogeneration plants are highly efficient, using both exhaust turbines and high pressure steam turbines. In the 1960's, boilers operated at 450C (840F) and 4MPa (40 atmospheres). Today's leading edge boilers operate at 620C (1150F) and 30MPa (300 ...


    By SnowPure Water Technologies

  • 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.

  • 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

  • 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

  • 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.

  • 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. ...

  • 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

  • Methods of Water Purification

    This article is excerpted from 'Pure Water Handbook' published by Osmonics®, Inc. of Minnetonka, Minnesota USA and is printed with permission of Osmonics, Inc. Water treatment can be defined as any procedure or method used to alter the chemical composition or natural 'behavior' of a water supply. Water supplies are classified as either surface water or groundwater. The majority of public or ...

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