American Society of Civil Engineers

CFD As Applied to the Development of a Hydrodynamic Vortex Mixer

by J. Fink, (No affiliation information available.) and R. Y. G. Andoh, (Hydro International, 94 Hutchins Drive, Portland, ME 04101)
Section: Emerging and Innovative Technologies, pp. 1472-1483, (doi:

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Document type: Conference Proceeding Paper
Part of: World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability
Abstract: Faced with the challenge of retrofitting a new sludge mixing and blending system into their wastewater treatment plant, the Middle Basin WWTP chose to adapt a non-powered vortex mixing technology typically used for CSO treatment. The resulting Hydrodynamic Vortex Mixer was analyzed to be fit for purpose using CFD simulations before it was fabricated, installed and tested. This paper outlines the development process for this custom "vortex mixer" from initial concept through preliminary CFD to the ultimate testing of the actual constructed unit. Assumptions made during the modeling process and how those assumptions were challenged during the testing phase of the project are described. As predicted by the engineering analysis, the unit worked as designed, creating a homogeneous mixture in a compact and energy efficient system. This highlights the flexibility of advanced hydrodynamic vortex systems within the field of urban water management including wastewater as well as CSO applications.

ASCE Subject Headings:
Wastewater management
Computational fluid dynamics technique