An Enhanced Backwashing Technique FOR IMPROVED FILTER RIPENING

The increased passage of particles through granular media filters immediately following backwashing is commonly known as the filter‐ripening period, and several strategies have been developed through the years to reduce the effect of this vulnerable period of the filtration cycle on finished water q...

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Bibliographic Details
Published inJournal - American Water Works Association Vol. 95; no. 12; pp. 81 - 94
Main Authors AMBURGEY, JAMES E., AMIRTHARAJAH, APPIAH, BROUCKAERT, BARBARA M., SPIVEY, NEAL C.
Format Journal Article
LanguageEnglish
Published Denver, CO American Water Works Association 01.12.2003
Subjects
Applied sciences
Backwash
Charged particles
Chemistry
Coagulants
Compliance
Drinking water and swimming-pool water. Desalination
Effluents
Exact sciences and technology
filteration
Filtration
Flow velocity
Pollution
Regulations
Ripening
Turbidity
Utilities
Water filtration
Water Quality
Water supply
Water treatment
Water treatment and pollution
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Summary:The increased passage of particles through granular media filters immediately following backwashing is commonly known as the filter‐ripening period, and several strategies have been developed through the years to reduce the effect of this vulnerable period of the filtration cycle on finished water quality. A new filter‐backwashing strategy aimed at reducing particle passage into the effluent water—the extended terminal subfluidization wash—has been developed and evaluated on both pilot‐ and full‐scale filters at a direct biological filtration plant. The filter‐ripening sequence (FRS) is described with new clarity based on the interpretation of experimental results. The numerous mechanisms and stages of the FRS are described in detail and may benefit future attempts to model the entire filtration cycle from a fundamental perspective.
ISSN:0003-150X
1551-8833
DOI:10.1002/j.1551-8833.2003.tb10513.x