Optimizing Hydraulic Efficiency of Anoxic Zones through Computational Fluid Dynamics Modeling and Residence Time Distribution Analysis

A combined approach of computational fluid dynamics (CFD) modeling and residence time distribution (RTD) analysis was utilized to optimize and validate the hydraulic efficiency of anoxic zones. Baseline CFD simulations satisfactorily assessed the hydraulic conditions of the anoxic zones, leading to the identification of areas requiring improvement. To address these identified issues, the CFD model explored various modification options, aiming to enhance volumetric efficiency and mixing efficiency. Through CFD simulations, cost-effective hydraulic improvement options were identified for each anoxic zone. Once the selected modifications are implemented, the performance of the modified system was verified through RTD analysis. This involved fitting a hydraulic model to the RTD data obtained from field tracer analysis, providing a comprehensive assessment of hydraulic performance before and after the modifications. The combined use of CFD modeling and RTD analysis presents numerous benefits, such as cost and time savings by avoiding costly trial-and-error installations, while ensuring dependable results.