Volumetric Clarifying Filtration of Urban Source Area Rainfall Runoff
Publication: Journal of Environmental Engineering
Volume 135, Issue 8
Abstract
Volumetric clarification is a common storm-water unit operation for hydrologic attenuation that couples particulate matter (PM) separation. Recent volumetric clarification can also include integrated filtration. This study examines the unsteady hydraulic and head loss response of a volumetric clarifying filter (VCF) system to urban source area hydrologic loadings in Baton Rouge, La for 19 fully captured events. The rainfall-runoff response of the paved watershed is examined as a direct VCF loading. Watershed responses yielded two classes of behavior; high volume events with an equilibrium volumetric runoff coefficient from 0.6–0.8 while low volume events were 0.4–0.6. Runoff PM as suspended sediment concentration (SSC) yielded coarse heterodisperse influent particle-size distributions (PSDs); transformed to finer and more monodisperse PSDs after treatment. While event-mean head loss is less than 25 mm, instantaneous values up to 200 mm were dependent on instantaneous flow to the filters. Without backwashing, filter ripening head loss is small due to the coarse uniform filter media and radial filter configuration, with a loss of 2% porosity across the series of 19 events. Despite filter ripening an Ergun model was capable of predicting head loss across the entire flow rate range. Head loss and flow frequency distributions were exponential. Results indicate that a volumetric clarifier, filter geometry, and engineered media combination are capable of reducing effluent SSC to through serial mechanisms of sedimentation followed by filtration.
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Acknowledgments
The writers acknowledge the support of Louisiana Transportation and Development (LADOTD), Louisiana Water Resources Research Institute (LWRRI), and Florida Department of Environmental Protection (FDEP).
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 135 • Issue 8 • August 2009
Pages: 609 - 620
Copyright
© 2009 ASCE.
History
Received: Aug 19, 2008
Accepted: Jan 12, 2009
Published online: Jul 15, 2009
Published in print: Aug 2009
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