Developments in Backwashing of Granular Filters
Reasons for the renewed interest in granular filter backwashing are presented, especially the more difficult backwashing problem encountered in wastewater filtration. Water fluidization...

Determining Specific Deposit by Backwash Technique
A method has been investigated for measuring the specific deposit. Experimental data are presented and compared with the calculated values from four mathematical models. Results indicated...

Surface Shear Waves
Two examples of steep very large amplitude waves are described. One occurs on flows below weirs or sluices and is known as the wave hydraulic jump. A simple analysis is presented to describe...

Backwashing of Granular Water Filters
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...

Filter Backwashing Tests and Upflow Equalization
Suspended solids are determined in backwash samples collected every 15 sec at critical points in filters throughout the backwash operation. Eight plants were visited to observe some 23...

Filtration Through a Trimedia Filter
An historical review of existing filter theory indicates the advantages of filtering from coarse to fine media. A study was made of filtration through trimedia beds and the filtration...

Effect of Backwash on Filter Effluent Quality
The effect of backwash rate and backwash duration on the quality of water produced by sand filters has been investigated on a plant scale. The best water quality was produced following...

Filtration Through Size-Graded Media
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...

Theory of Water Filtration
The Kozeny equation of laminar flow through granular materials is extended to the transition region by means of a chart of the friction factor versus the Reynolds number. A chart of the...

 

 

 

 

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