Minimizing Site Layout While Improving Screening and Self Cleaning Pump Stations with CFD Modeling

摘要

The footprint of two recently constructed headworks screen and influent pump station (IPS) facilities for the Cities of Turlock and San Leandro, CA, were minimized using Computational Fluid Dynamics (CFD) modeling. Both facilities had parallel coarse screen channels, followed by self-cleaning trench style wet wells. The Turlock IPS used vertical turbine solids handling pumps with flows up to 40 mgd in a single self-cleaning trench type wet well. The San Leandro IPS used submersible pumps with a flow range of 2.7 to 27.5 mgd in parallel self-cleaning trench type wet wells. In both cases influent sewers entering the headworks area at a 90-degree angle leading to a non-standard approach condition. Conventional spacing between bends and equipment would result in a very large facility footprint. The CFD model was used to understand and improve the screen approach conditions, pump intake conditions, and self-cleaning operation of the wet wells.