Physical Modeling Reveals Secrets, and Identifies Modifications to Improve Hydraulic Performance

A scaled physical model of the high purity oxygen process at the Sacramento Regional Wastewater Treatment Plant was used to evaluate the flow distribution problems and identify potential fixes. A comprehensive field testing program was implemented to collect data needed for calibrating and verifying the physical model. The calibrated physical model was then used to determine possible solutions to improve hydraulic distribution. Minor modifications such as installation of vanes and baffles were found effective in improving flow distribution among individual tanks under certain flow conditions. Major modification such as widening a mixed liquor channel was identified as a possible solution to improve the flow balance between the south and north sides of the oxidation tank facility and increase hydraulic capacity the treatment plant.