Research Article
Dec 1980
Hydraulic Considerations in Declining-Rate Filtration
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VIEW THE REPLYPublication: Journal of the Environmental Engineering Division
Volume 106, Issue 6
Abstract
Flow control through granular filters is an important factors in filter performance in both water and wastewater treament. Declining-rate filtration plants operate without effluent rate control devices on each filter. All the filters in the plant operate at the same water level and the same head loss. Therefore, the cleanest filter operates at the highest filtration rate and the dirtiest filter operates at the lowest rate. The filters decline in rate as each filter is backwashed in succession. Declining-rate filtration plants produce better water quality and require less head loss than constant-rate or constant water level filters. The design of declining-rate plants has been hampered by the absence of rational approaches to several hydraulic questions which are answered in the paper as follows: What total head loss is required? How can excessive filtration rates be prevented without the use of rate controllers? How can the water level variations in the filter be predicted and how are they affected by the number of filters in the plant? How does the plant respond to imposed load variations
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Published In
Journal of the Environmental Engineering Division
Volume 106 • Issue 6 • December 1980
Pages: 1043 - 1055
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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John L. Cleasby, M.ASCE
Prof. Dept. of Civ. Engrg., Iowa State Univ., Ames, Iowa
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
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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.