Research Article
Dec 1980
Upgrading Lagoon Effluents with Rock Filters
Publication: Journal of the Environmental Engineering Division
Volume 106, Issue 6
Abstract
Rock filtration is an effective, low-cost unit process for removing algae from effluents and correspondingly upgrading lagoon treatment. Sedimentation is the primary mechanism of algal removal within rock filter. A mathematical model of the sedimentation mechanism indicated that total suspendedsolids (TSS) removal efficiency is a function of the distribution of algal settling velocities, the hydraulic retention time, and the effective settling distance in the rock filter. Weekly average effluent biochemical oxygendemand (BOD5) and TSS from the Veneta, Ore, lagoon-rock filter treatment facility did not exceed 20 mg/L over a 1-yr study period. Settling rates of algae from the Veneta lagoon averaged about 0.05 my. A linear relationship between TSS removal efficiency and hydraulic loading rate was demonstrated.
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Published In
Journal of the Environmental Engineering Division
Volume 106 • Issue 6 • December 1980
Pages: 1111 - 1129
Copyright
© 1980 American Society of Civil Engineers.
History
Published in print: Dec 1980
Published online: Feb 11, 2021
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Authors
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Gregory R. Swanson, AM.ASCE
Grad. Student Oregon State Univ., Corvallis, Oreg.
Kenneth J. Williamson, AM.ASCE
Assoc. Prof. Oregon State Univ., Corvallis, Oreg.
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