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Improvements in Mixing Operations of Water Treatment Plants by Use of a Stable Finite Element Model

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Abstract:

This work shows improvements made in mixing operations at water treatment plants, as a result of the hydrodynamic analysis of the mixing processes carried out by the use of a Finite Element Model. The code, developed in the Civil Engineering Department of the University of La Coruña, Spain, solves the Navier-Stokes equations that rule viscous incompressible flow by using a Streamline Upwind/Petrov-Galerkin (SUPG) stabilization technique. The incorporation of the SUPG formulation leads to obtaining stable solutions for Reynolds numbers of a moderate order in connection with meshes that are not very refined. Some water treatment units present significant deficiencies in their design. The numerical evaluation of the flow avoids the high expenses of the trial-and-error processes involved in installing and removing the mixing mechanisms and those derived from the need to halt the water treatment processes. As a result, an optimum design of the treatment plant is obtained at a low cost.

Keywords: Finite Element Method; Navier-Stokes; Streamline Upwind/Petrov-Galerkin; agitation; mixing; water treatment

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143006X136757

Affiliations: 1: Dpto. de Métodos Matemáticos y de Representación, Universidad de La Coruña, Spain. , Dpto. de Métodos Matemáticos y de Representación, E.T.S. de Ingenieros de Caminos, Canales y Puertos, Universidad de La Coruña, Campus de Elvira, 15071 La Coruña, Spain; vellando@iccp.udc.es. 2: Dpto. de Métodos Matemáticos y de Representación, Universidad de La Coruña, Spain. 3: Dpto. de Tecnología de la Construcción, Universidad de La Coruña, Spain.

Publication date: June 1, 2007

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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