Research Article
Dec 1971
Backwashing of Granular Water Filters
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VIEW THE REPLYAuthors: Thomas R. Camp, HM.ASCE, S. David Graber, AM.ASCE, and Gerard F. ConklinAuthor Affiliations
Publication: Journal of the Sanitary Engineering Division
Volume 97, Issue 6
Abstract
The grains of a rapid water filter are best cleansed by washing upward with water consistently at a rate sufficient to fluidize the entire bed and for a period sufficient to wash the dislodged floc particles out of the bed and into the wash water gutters. Effective washing cannot be accomplished in operation unless the means are provided in the design and construction of the filter plant. Mathematical relationships are developed for beds fluidized by water, beds fluidized by an air-water mixture, and fluidized multi-media beds. Experimental procedures and data are presented, which were used to develop and substantiate the mathematical relationships, or both, and provide useful design information. Suggestions are given for the design of the bed and filter bottom to achieve effective washing. The value of surface wash and air wash is analyzed. It is noted that when air is applied to a bed which is fluidized with water, the bed expansion is reduced.
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Published In
Journal of the Sanitary Engineering Division
Volume 97 • Issue 6 • December 1971
Pages: 903 - 926
Copyright
© 1971 American Society of Civil Engineers.
History
Published in print: Dec 1971
Published online: Feb 12, 2021
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Authors
Affiliations
Thomas R. Camp, HM.ASCE
Partner Emeritus, Camp, Dresser & McKee, Cons. Engrs., Boston, Mass.
S. David Graber, AM.ASCE
Project Engr., Camp, Dresser & McKee, Cons. Engrs., Boston, Mass.
Gerard F. Conklin
Research Asst., Camp, Dresser & McKee, Cons. Engrs., Boston, Mass.
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