Stormwater Symposium

Oral

397783 - Is the Treatment Response of Manufactured Unit Operations to Urban Drainage Loads Portable?

Wednesday, June 6
2:00 PM - 3:30 PM
Location: Greenway AB
Co-Authors: John Sansalone, Gainesville, FL – University of Florida

Hydrodynamic separators and clarifiers, as unit operations (UOs) for particulate matter (PM) separation, are common small footprint best management practices (BMP). Testing protocols and physical model results for such UOs are often assumed to only be applicable by city, state or region due to variations in climactic and environmental conditions, leading to regulatory and implementation challenges. The presented study examined four specific parameters with the potential to alter UO behavior: 1. hydrograph unsteadiness, 2. PM particle size distribution (PSD), 3. PM specific gravity, and 4. water temperature. UO behavior as PM separation efficiency (ßPM), was normalized for each parameter to examine if UO results can be ported across a series of urban environs. To generate normalized ßPM results computation fluid dynamics (CFD) models were applied for seven flow rates, three levels of specific gravity and three temperatures over a hetero-disperse PSD from 1 to 2000 µm. These CFD models were validated within 10% of physical model results for measured events. Additionally, these parameters were analyzed with normalized ßPM results to model three hydrographs loading the studied UOs. Results indicate the greatest impact on UO behavior is influent PSD while specific gravity and hydrograph characteristics have significant but less pronounced impacts. Temperature has a minor impact. Results demonstrate the normalized ßPM approach for a specific UO accounts for the variability of these common parameters examined and thus UO behavior can be portable across geographic locations. Results further suggest the potential of a more unified physical model testing protocol for UO certification and the deployment of validated CFD models to support physical testing.
This presentation is adapted from: Spelman, D., Sansalone, J. (in press, 2017). “Is the Treatment Response of Manufactured BMPs to Urban Drainage PM Loads Portable?” ASCE J. Environ. Eng.

David W. Spelman, PhD

Assistant Professor
Bradley University

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