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Three-dimensional computational fluid dynamic modelling of a facultative lagoon

Salter, HE, Ta, CT, Ouki, SK and Williams, SC (2000) Three-dimensional computational fluid dynamic modelling of a facultative lagoon Water Science and Technology, 42 (10-11). pp. 335-342.

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Abstract

A series of facultative lagoons operated by Thames Water treating industrial wastewater in Thailand were found to be performing poorly, particularly with respect to the removal of biological oxygen demand (BOD). A review of the design parameters for the site found that all the lagoons are of a sufficient area for the flow and BOD load. However, observations of the lagoons suggested that there may be significant hydraulic short-circuiting. Computational fluid dynamics (CFD) modelling was therefore carried out on one of the lagoons to establish the hydraulic regime. Two-consecutive simulations were carried out, both with and without baffles; the first to establish steady flow conditions, and the second using a chemical species transport model to obtain the residence time distribution (RTD). The results of the modelling indicate that the lagoons do currently suffer from significant short-circuiting, and large dead-zones are present. The installation of baffles in the CFD model improved the plug-flow characteristics of the lagoons, substantially reducing the short-circuiting and the size of the dead-zones. It has therefore been concluded that the installation of baffles in the lagoons will lead to an improvement in their performance, by increasing the retention time of the system.

Item Type: Article
Authors :
NameEmailORCID
Salter, HEUNSPECIFIEDUNSPECIFIED
Ta, CTUNSPECIFIEDUNSPECIFIED
Ouki, SKs.ouki@surrey.ac.ukUNSPECIFIED
Williams, SCUNSPECIFIEDUNSPECIFIED
Date : 1 December 2000
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:33
Last Modified : 17 May 2017 15:11
URI: http://epubs.surrey.ac.uk/id/eprint/839648

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