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CFD Model Proves to be Useful Tool for Anoxic Channel Modifications at MWRD

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Increasingly stringent nutrient limits for wastewater discharge is requiring many facilities to incorporate upgrades for increased nutrient removal. Increased nutrient removal typically involves the use of anoxic or anaerobic reactors to provide a selective environment for organisms capable of accumulating or removing nutrients. Anoxic and anaerobic reactors can be negatively impacted by return flows containing dissolved oxygen. Many return flows are kept in suspension by air mixing systems, which entrain dissolved oxygen. In converting existing systems to incorporate anoxic or anaerobic reactors, it is beneficial to provide mixing and suspension of return flows without the use of air. Design of mixing systems without the use of air, is greatly enhanced by the use of Computational Fluid Dynamic (CFD) modeling. CFD models allow an economic means of assessing the geometries and energy requirements of specifically designed fluid mixing systems. This paper provides an overview of the design, construction, and operation of a unique anoxic mixing system installed at Metro Wastewater Reclamation District' s (MWRD), Robert W. Hite Treatment Facility (RWHTF), North Secondary Complex, which facilitated combining return flows of Return Activated Sludge (RAS) and Primary Effluent (PE) while minimizing dissolved oxygen impacts to their nutrient removal process.
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Keywords: CFD; anaerobic; anoxic; biological nutrient removal; conversion; dissolved oxygen; mixing; modeling; suspended solids; velocity

Document Type: Research Article

Publication date: 2011-01-01

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