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Computational fluid dynamics?based modeling and optimization of flow rate and radiant exitance for 1,4-dioxane degradation in a vacuum ultraviolet photoreactor

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Title: Computational fluid dynamics?based modeling and optimization of flow rate and radiant exitance for 1,4-dioxane degradation in a vacuum ultraviolet photoreactor
Authors: Shi, Gang Browse this author
Nishizawa, Shota Browse this author
Matsushita, Taku Browse this author →KAKEN DB
Kato, Yuna Browse this author
Kozumi, Takahiro Browse this author
Matsui, Yoshihiko Browse this author →KAKEN DB
Shirasaki, Nobutaka Browse this author →KAKEN DB
Keywords: Advanced oxidation process
Radiation efficiency
Issue Date: 1-Jun-2021
Publisher: Elsevier
Journal Title: Water research
Volume: 197
Start Page: 117086
Publisher DOI: 10.1016/j.watres.2021.117086
Abstract: 1,4-Dioxane is one of the most persistent organic micropollutants in conventional drinking-water treatment processes. Vacuum ultraviolet (VUV) treatment is a promising means of removing micropollutants such as 1,4-dioxane from source water, but this approach has not yet been implemented in a fullscale water treatment plant, partly because the operating parameters for pilot and full-scale VUV photoreactors have not been optimized. Here, we developed a computational fluid dynamics & ndash;based method for optimizing VUV photoreactor performance through energy-based analyses that take into account the effects of two important operating parameters & mdash;flow rate and radiant exitance. First, we constructed a computational fluid dynamics model and determined the sole parameter required for the model, the pseudo-first-order rate constant for the reaction of 1,4-dioxane, by simple batch experiment. Then, we validated the model by using a pilot-scale flow-through annular photoreactor. Finally, we used the validated model to examine the effects of flow rate and radiant exitance on the efficiency of 1,4-dioxane degradation in a virtual annular photoreactor. Radiation efficiency, which was defined as the ratio of the logarithmic residual ratio of 1,4-dioxane to the theoretical minimum logarithmic residual ratio (best possible performance) under the given operating conditions, was calculated as an energy-based index of cost-effectiveness. Radiation efficiency was found to increase with increasing flow rate but decreasing radiant exitance. An electrical energy per order (EEO) analysis suggested that VUV treatment under laminar flow was most economical when low-power lamps and a high flow rate were used. In contrast, VUV treatment under turbulent flow was suggested to be most economical when high-power lamps were used at a high flow rate.
Rights: © <2021>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松下 拓

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