Research Article
Dec 1980
Declining-Rate Versus Constant-Rate Filtration
Publication: Journal of the Environmental Engineering Division
Volume 106, Issue 6
Abstract
The study conclusively showed the benefits of the declining rate system. Both systems were operated at the average filtration rates at a municipal lime softening plant. The declining-rate filter system produced an average filtrate turbidity which was consistently and substantially better than the constant-rate filter at all three filtration rates studied. The average filter run length for the declining-rate system was substantially affected by the amount of turbulent piping head losses in the system and the maximum filtration rate allowed on the newly backwashed filter. When operated to the same head loss increase in the filter media, the constant-rate filter run length was substantially shorter than the run length obtained for the declining-rate filter system. The filtration rates in the individual filters of the declining-rate system remained constant between backwashings and declined in a stepwise fashion after each backwash was completed.
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Information
Published In
Journal of the Environmental Engineering Division
Volume 106 • Issue 6 • December 1980
Pages: 1023 - 1041
Copyright
© 1980 American Society of Civil Engineers.
History
Published in print: Dec 1980
Published online: Feb 11, 2021
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Authors
Affiliations
Luiz Di Bernardo, AM.ASCE
Asst.-Doctor Prof. Dept. of Hydr. and Sanitation, School of Engrg. of Sao Carlos, Univ. of Sao Paulo, Sao Carlos, Brazil; formerly, Post-Doctoral Fellow, Dept. of Civ. Engrg, Iowa State Univ., Ames, Iowa
John L. Cleasby, M.ASCE
Prof. Dept. of Civ. Engrg., Iowa State Univ., Ames, Iowa
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.