A single-medium rapid sand filter has a uniform grain size of 0.22cm and a porosity (ԑ) of 0.40. The specific gravity of the sand is 2.65. The bed will be fluidized during backwashing when the bed will be expanded by 15%. Determine the backwash rate in liter /s-m2 to fluidize the bed.

A single-medium rapid sand filter has a uniform grain size of 0.22cm and a porosity (ԑ) of 0.40. The specific gravity of the sand is 2.65. The bed will be fluidized during backwashing when the bed will be expanded by 15%. Determine the backwash rate in liter /s-m2 to fluidize the bed.

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.17P

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Problem 7.17
soil هفصشبكطودذؤ
A sand sample of 35m cm^2 cross sectional area and 20cm long was tested in a constant head permeameter. Under a head of 60 cm, the discharge was 120 ml in 6min. The dry weight of sand used for the test was 1120 g, and Gs= 2.68 A. Determine the hydraulic conductivity in cm/sec. B.Determine the discharge velocity in cm/sec. C. Determine the seepage velocity in cm/sec.
THIS IS SOIL SCIENCE THAT IS NEED TO SOLVE AND HAVE A SOLUTION
D. Law,