Optimization of Settling Tank Design to Remove Particles and Metals
Publication: Journal of Environmental Engineering
Volume 134, Issue 11
Abstract
Mass reduction rates of particles and metals were simulated for a two-compartment settling tank composed of a storage compartment and a continuous flow compartment. Particle-size distribution, rainfall, and flow data from 16 storm events measured at three highway sites were used. The volume ratio (i.e., ratio of surface areas for a given depth) between storage and continuous flow compartment was optimized for a given design storm size to maximize total mass reduction rates of particles and heavy metals. Measured settling velocity profiles of runoff samples were used in the simulation. Simulation results showed that in a given total design storm, larger storage compartment fractions enhanced the removal of smaller particles and particulate phase metals, and even a small fraction of continuous flow compartment effectively removed larger particles . A volume fraction of 0.75 for the storage compartment is suggested to optimize annual reductions of particles and associated heavy metals.
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Acknowledgments
This study was supported in part by the California Department of Transportation (Caltrans), Division of Environmental Analysis. The writers are grateful for their continuous support.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 134 • Issue 11 • November 2008
Pages: 885 - 894
Copyright
© 2008 ASCE.
History
Received: Mar 5, 2007
Accepted: Mar 18, 2008
Published online: Nov 1, 2008
Published in print: Nov 2008
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