Chlorine Dioxide Dosing Articles

  • Oxidized fulvic acid adsorption on activated carbon

    This study evaluates and compares the parameters of equilibrium adsorption from aqueous solutions of river fulvic acids (FA) and peat fulvic acids. Compared to peat FA, the river FA had lower biodegradable dissolved organic carbon (BDOC). We observed a tendency for correlation between change of Gibbs free energy of adsorption and BDOC value. A chlorination dose of 1.4 mg L−1 did not ...


    By IWA Publishing

  • Monochloramine and chlorine dioxide for controlling Legionella pneumophila contamination: biocide levels and disinfection by-product formation in hospital water networks

    Legionella colonization in hospital hot water distribution networks was evaluated following 36 months of continuous treatment with monochloramine and compared with chlorine dioxide. Nitrite, nitrate, chlorite, chlorate, bromide, trihalomethanes and haloacetic acids as well as the biocide concentration at sampled points were measured. Only 8/84 samples treated with monochloramine were found ...


    By IWA Publishing

  • Removal of APIs and bacteria from hospital wastewater by MBR plus O3, O3 + H2O2, PAC or ClO2

    The objective of this study has been to develop technologies that can reduce the content of active pharmaceutical ingredients (APIs) and bacteria from hospital wastewater. The results from the laboratory- and pilot-scale testings showed that efficient removal of the vast majority of APIs could be achieved by a membrane bioreactor (MBR) followed by ozone, ozone + hydrogen peroxide or ...


    By IWA Publishing

  • The synergistic effect of Escherichia coli inactivation by sequential disinfection with low level chlorine dioxide followed by free chlorine

    To the best of our knowledge, there was little information available on pathogen removal using low level disinfectant followed by free chlorine in sequential disinfection (SD). This study investigated Escherichia coli inactivation by four types of disinfection: single step disinfection (SSD), SD, traditional sequential disinfection (TSD) and mixed disinfectant disinfection (MDD). Results ...


    By IWA Publishing

  • Accidental releases analysis for toxic aqueous solutions

    Abstract As a result of the cluster rule for the control of the hazardous air pollutants, pulp and paper mills are in the process of further substituting chlorine with aqueous chlorine dioxide for their bleaching operations. In addition, ammonia aqueous solutions are applied by paper mills in various processes. An evaporation model including both heat and mass transfer for aqueous ...


    By Trinity Consultants

  • Correlations between surrogate nitrogenous organic precursors and C-, N-DBP formation

    Nitrosamines have been emerging as disinfection byproducts in drinking water using source water impacted with domestic wastewaters. Nitrogenous organic compounds are suggested as precursors of nitrosamines, but many of them have not been identified. This study investigated the correlations between nine selected nitrogenous organic compounds with different characteristics and corresponding ...


    By IWA Publishing

  • J555 gasless disinfection

    Detailed design, works manufacture and site installation of Sodium Hypochlorite dosing systems for conversion of 6 sites from Chlorine gas to liquid Sodium Hypochlorite Client: MWH Area: Hertfordshire WES Ltd were involved from early on in the project design stage in developing new Sodium Hypochlorite and Sodium Bisulphite dosing systems for Three Valleys ...


    By WES Ltd / Weschem Ltd

  • Grundfos Alldos Chlorine Dioxide System in Malaysia’s new Sepangar Bay submarine naval base

    Background At the Malaysia’s New Sepangar Bay Submarine Naval Base, Bacfree-Trident Water is selected to provide and retreat the direct potable water from municipal treated water for marine vessel applications. The source water is from the local municipal treated water supply source and is of excellent quality for most of the time. However, the water may be undesirable for direct ...


  • Simultaneous reduction of by-products of chlorine dioxide and chlorine using Fe(II)–Al(III) coagulant mixture

    Ferrous iron has been considered very useful for removal of chlorite, a by-product of chlorine dioxide. However, a serious problem can occur associated with high residual iron concentrations in water after Fe(II) treatment, especially at weak acidic condition (pH 6), having a higher capacity of chlorite reduction. Simultaneous removal of chlorite, dissolved iron, and humic acids was achieved with ...


    By IWA Publishing

  • Effect of the disinfection agents chlorine, UV irradiation, silver ions, and TiO2 nanoparticles/near-UV on DNA molecules

    Extracellular DNA in municipal wastewater and effluents from hospitals and R&D laboratories contains antimicrobial resistance and recombinant genes that are today considered as a new class of emerging contaminants. The objective of this research was to investigate the effect of disinfection agents on the integrity of DNA molecules by using real-time PCR. Escherichia coli cell suspensions and ...


    By IWA Publishing

  • Cleaning mold containing surfaces

    Once a determination is made that a moldy surface can be cleaned instead of removed or demolished, what cleaning agents are effective in removing or killing the mold? Many factors influence the selection of a cleaning agent. 1). The type of surface to be cleaned: Is it porous? Hard such as cement or sheetrock? Soft, such as cloth, fabric or wallpaper? Absorbent and thick such as rugs, ...

  • Catalytic oxidation and spectroscopic analysis of simulated wastewater containing acid chrome blue K by using chlorine dioxide as oxidant

    An activated carbon-MnO2 catalyst was prepared by the dipping-calcination method using activated carbon as catalyst support. The catalyst was used for the catalytic oxidation of simulated acid chrome blue K wastewater. The COD removal efficiency and decolor efficiency by catalytic oxidation are 72.0% and 87.8%, respectively, at the condition of wastewater's COD is 2,418 mg/L, the optimum pH value ...


    By IWA Publishing

  • Using RuO2 anode for chlorine dioxide production in an un-divided electrochemical cell

    Chlorine dioxide is a well known powerful disinfectant. Although there are several chemical and electrochemical methods developed for on-line chlorine dioxide generation, the details are mostly confined as patents. We studied in this work the electrochemical generation of dissolved chlorine dioxide from an un-buffered solution of sodium chlorite and sodium chloride mixture in an un-divided ...


    By IWA Publishing

  • Optimized hygiene in the beverage filling process - Case Study

    The company Teutoburger Christinenbrunnen GmbH & Co. in Bielefeld has realized and implemented new options in the area of the filling hygiene in a short term. In June 2008 a filling line in the plant Bielefeld was upgraded, so that during the running production the required hygiene status is kept during the whole filling time. With this technology beverages can be filled in their native form ...


    By Aquadron

  • Advanced technology for water purification by heterogeneous photocatalysis

    The TiO2 photocatalytic degradation of 2,4-dichlorophenol (2,4-DCP) and pentachlorophenol (PCP) was examined using a prototype photoreactor fabricated by Nulite. The degradation of both pollutants proved very efficient as in 12 min it was possible to bring the concentration of 2,4-DCP from 10 to 0.5 p.p.m. and in a separate experiment the concentration of PCP from 100 to 0.5 p.p.b. The effect of ...


    By Inderscience Publishers

  • Blue-White's Flex-Flo A3 Peristaltic pumps in sodium hypochlorite applications

    The use of peristaltic pumps as the most effective method to pump sodium hypochlorite in water treatment plant applications.   Tube life averages 7000-7500 hours in this low pressure application illustrated below: The quality of life for Americans was greatly enhanced in the early 1900’s due to the introduction of chlorinated drinking water throughout the United States water ...


  • Outbreak of Giardiasis and Cryptosporidiosis Associated with a Neighborhood Interactive Water FountainFlorida, 2006

    An outbreak of giardiasis and cryptosporidiosis was identified in central Florida in September 2006. Environmental and epidemiological investigations indicated the likely source was a neighborhood interactive water fountain in a large upscale urban neighborhood. Forty-nine cases meeting the case definition were identified, of which 38 were giardiasis, nine were cryptosporidiosis, and two were ...

  • Effect of gaseous chlorine dioxide on indoor microbial contaminants

    Traditional and modern techniques for bioaerosol enumeration were used to evaluate the relative efficiency of gaseous chlorine dioxide (ClO2) in reducing the indoor microbial contamination under field and laboratory conditions. The field study was performed in a highly microbially contaminated house, which had had an undetected roof leak for an extended period of time and exhibited large areas of ...

  • Waterworks city of Toulouse

    Two chlorine dioxide plants with very high capacities are in operation in order to supply the city of Toulouse with drinking water. Absolute safety in distribution of the decontaminated water to the households is required. During pre-chlorination and during post-chlorination of the water, the second system is in stand-by operation and is automatically switched on at a possible failure. The ...


  • From Gas to Liquid: Large-Scale Chlorination System Conversion

    Abstract A number of wastewater treatment facilities using gas disinfection have decided to convert to liquid disinfection for several reasons including safety, regulatory, security, and economic factors. An optimal technology plan should be developed to facilitate the conversion. This presentation provides a case study of a large chlorine disinfection system, and demonstrates key issues of ...

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