Research Article
Jun 1965
Filtration Through Size-Graded Media
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VIEW THE REPLYPublication: Journal of the Sanitary Engineering Division
Volume 91, Issue 3
Abstract
Existing theory for filters containing media of one size has been extended to filtration through size-graded media. This theory demonstrates the advantages of filtering into the coarsest media first, then through subsequently finer media. This is the reverse of present (1965) practice in sand filters. Experiments compared down-flow (normal) with upflow (reverse) filtration, showing the operating advantages of the latter. Washing upflow filters gave practical difficulties. An experimental three-layer filter of coarse anthracite, on medium-size sand, on fine garnet sand, enabled filtration to proceed downwards but through the correct grading sequence suggested by the theory. This filter produced considerably lower head losses for comparable filtrate quality as compared with a normal sand filter with equivalent grain sizes. The three-layer format remained stable after several upflow backwashings that fluidized the media.
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Information & Authors
Information
Published In
Journal of the Sanitary Engineering Division
Volume 91 • Issue 3 • June 1965
Pages: 89 - 116
Copyright
© 1965 American Society of Civil Engineers.
History
Published in print: Jun 1965
Published online: Feb 12, 2021
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Authors
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Ernest W. J. Diaper
Senior Civ. Engr., Glenfield & Kennedy Ltd., London, England
Kenneth J. Ives, M.ASCE
Reader in Civ. and Municipal Engrg., Univ. Coil., London, England
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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.
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