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Author      Title/Abstract      

Evaluation of Primary Sedimentation Tanks Performance By Integrating Mathematical Modeling With Field Testing
Author: Hany Gerges, Eric J. Wahlberg, Tim Block, Harold Voth
Date: 10/99
Presented at WEF 72nd Annual Conference and Exposition, New Orleans, Louisiana, October 9-13, 1999

A new methodology for re-rating and evaluating the performance of primary sedimentation tanks (PSTs) in wastewater treatment plants was developed. The methodology was based on the integration of mathematical (numerical) modeling with field-testing. A high accuracy clarifier model (HACM) was used to simulate the flow field in the PSTs. A new approach for estimating the settling velocity distribution of the influent suspended solids was developed. The distribution was then used as an input to the model. The model was used to estimate the total removal efficiency of the suspended solids under different flow rates.