Full-scale Modelling of an Ozone Reactor for Drinking Water Treatment

BIOMATH, Department of Applied Mathematics, Biometrics and Process Control, Ghent University, Coupure Links 653, 9000 Gent, Belgium
The Chemical Engineering Journal (Impact Factor: 4.32). 03/2010; 157(2-3):551-557. DOI: 10.1016/j.cej.2009.12.051


In 2003, the Flemish Water Supply Company (VMW) extended its drinking water production site in Kluizen (near Ghent, Belgium) with a combined ozonation and biological granular activated carbon (BGAC) filtration process. Due to this upgrade, biostability increased, less chlorination was needed and drinking water quality improved significantly. The aim of this study was to describe the full-scale reactor with a limited set of equations. In order to describe the ozonation process, a model including key processes such as ozone decomposition, organic carbon removal, disinfection and bromate formation was developed. Kinetics were implemented in WEST® and simulation results were compared to real data. The predicting performance was verified with a goodness-of-fit test and key parameters were determined through a local sensitivity analysis. Parameters involving optical density (both rate constants and stoichiometric coefficients) strongly affect model output. Some parameters with respect to bromate and bacteria showed to be only, but to a large extent, sensitive to their associated concentrations. A scenario analysis was performed to study the system's behavior at different operational conditions. It was demonstrated that the model is able to describe the operation of the full-scale ozone reactor, however, further data collection for model validation is necessary.

Download full-text


Available from: Wim T.M. Audenaert
  • Source
    • "Drinking water is crucial to human life. Producing clean drinking water that is free of bacteria and most pollutants requires the application of some physical, chemical, and biological treatment methods (Broséus et al. 2009; Audenaert et al. 2010; Benner et al. 2013). "
    [Show abstract] [Hide abstract]
    ABSTRACT: The effect of ozonation on the microbial activities of domestic well drinking water was investigated, and the influence of the treatment conditions such as pH, temperature, ozone dose, and contact time was elucidated by comparing removal efficiencies. The results revealed that the disinfection of the microorganisms was related to an increase in contact time and thereby increases in Ct values with ozone. Higher ozone doses led to a large amount of microbial inactivation. The addition of hydroxyl and hydronium ions contributed greatly to the destruction of any microorganism in both acidic and basic mediums, achieving 25–88% efficiencies.
    Full-text · Article · Jul 2015 · Ozone Science and Engineering
    • "-N were calculated as 0.30, 0.40, 0.09 and 0.09, respectively. The TIC was usually used to evaluate the goodness-of-fit between experimental and simulated values , and when a value of the TIC lower than 0.3 indicates a good agreement with measured data [61] [62] the results suggested that the substrate removal efficiency is well predicted. Because of the underestimation of the NO − 2 -N concentration, a somewhat lower agreement is obtained with the effluent concentrations. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Anammox has shown its promise and low cost for removing nitrogen from high strength wastewater such as landfill leachate. A reactor was inoculated with nitrification-denitrification sludge originating from a landfill leachate treating waste water treatment plant. During the operation, the sludge gradually converted into red Anammox granular sludge with high and stable Anammox activity. At a maximal nitrogen loading rate of 0.6 g N l(-1) d(-1), the reactor presented ammonium and nitrite removal efficiencies of above 90%. In addition, a modified Stover-Kincannon model was applied to simulate and assess the performance of the Anammox reactor. The Stover-Kincannon model was appropriate for the description of the nitrogen removal in the reactor with the high regression coefficient values (R2 = 0.946) and low Theil's inequality coefficient (TIC) values (TIC < 0.3). The model results showed that the maximal N loading rate of the reactor should be 3.69 g N l(-1) d(-).
    No preview · Article · May 2014 · Environmental Technology
  • Source
    • "The first-order ozone decay constant seemed to be less important. Audenaert et al. (2010) performed a local sensitivity analysis (SA) on a simple model that was used to predict residual ozone, bromate formation, DOM oxidation and disinfection . In that study, parameters related to DOM were found to be of major importance. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Ozone decomposition in real water is often empirically modelled due to the system complexity. Mechanistic models, however, can be of great value in view of engineering applications. The high number of model parameters often restricts their applicability. In this study, sensitivity analyses were used to determine the most important elementary reactions from a kinetic model and to understand the reaction mechanism. Only seven of the twenty-eight rate constants showed to impact ozone and hydroxyl radical concentrations. Mass-transfer related parameters were of major importance. Ozone decomposition was extremely sensitive to parameters involving dissolved organic matter (DOM) at very low scavenger levels implying that even in “ultrapure” water systems impurities should be considered. To increase the applicability of mechanistic ozonation models, simplification of the elementary radical scheme combined with a more detailed description of reactions involving DOM is needed.
    Full-text · Article · May 2013 · Ozone: Science and Engineering
Show more