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Mechanism of Rapid Filtration in a Uniform Filter Bed
Author(s) -
Craft T. F.,
Eichholz G. G.
Publication year - 1970
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr006i002p00527
Subject(s) - anthracite , filtration (mathematics) , materials science , particle (ecology) , vermiculite , van der waals force , particle size , range (aeronautics) , filter (signal processing) , mechanics , mineralogy , porous medium , geotechnical engineering , composite material , chemistry , porosity , coal , geology , physics , mathematics , statistics , oceanography , organic chemistry , molecule , computer science , computer vision
A radiotracer study has been carried out with cesium‐137 labeled vermiculite particles to study the pattern of removal in a deep sand filter under rapid flow conditions. Sized sand and anthracite were used as bed media, and suspended particles were sized between 1 and 120 microns. By comparing the activity ratios in the upper bed levels, curves were obtained relating the filter coefficient to particle size and bed pore sizes. By analyzing the curves in relation to the various theories proposed to account for filter action, it was shown that interstitial sieving was the dominant mechanism down to a nominal pore‐particle ratio of 4. Below this ratio, van der Waals forces were shown to be adequate to explain residual removal effects, and the effective range of these forces was calculated.