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Contact tank design impact on process performance

Angeloudis, Athanasios, Stoesser, Thorsten, Gualtieri, Carlo and Falconer, Roger Alexander 2016. Contact tank design impact on process performance. Environmental Modeling & Assessment 21 (5) , pp. 563-576. 10.1007/s10666-016-9502-x

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Abstract

In this study three-dimensional numerical models were refined to predict reactive processes in disinfection contact tanks (CTs). The methodology departs from the traditional performance assessment of contact tanks via hydraulic efficiency indicators, as it simulates directly transport and decay of the disinfectant, inactivation of pathogens and accumulation of by-products. The method is applied to study the effects of inlet and compartment design on contact tank performance, with special emphasis on turbulent mixing and minimisation of internal recirculation and short-circuiting. In contrast to the conventional approach of maximising the length-to-width ratio, the proposed design changes are aimed at addressing and mitigating adverse hydrodynamic structures, which have historically led to poor hydraulic efficiency in many existing contact tanks. The results suggest that water treatment facilities can benefit from in-depth analyses of the flow and kinetic processes through computational fluid dynamics, resulting in up to 38 % more efficient pathogen inactivation and 14 % less disinfection by-product formation.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Engineering
Water Research Institute (WATER)
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
Publisher: Springer
ISSN: 1420-2026
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 2 February 2016
Last Modified: 08 May 2019 02:39
URI: http://orca.cf.ac.uk/id/eprint/87604

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