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The treatment process at the City of Woodland's Water Pollution Control Facility (WPCF) is being enhanced to improve nitrogen removal. The existing oxidation ditches will be converted to a once through treatment process. Computational fluid dynamics (CFD) modeling was used to evaluate mixing of solids with the converted tank, using a solids transport equation within the computation. The type, location, and orientation of mixers in anoxic regions were evaluated to ensure solids remained in suspension and well mixed. The aerated zone mixing was evaluated with a multi-phase model to verify the injected air would mix the complete trapezoidal cross section, including through a 180-degree bend.

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