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Effect of backwash on filter effluent quality
Effect of backwash rate and backwash duration on quality of water produced by sand filters has been investigated on plant scale; best water quality was produced following backwash rates of 16.7 gpm/sq ft in filters with sand of effective size of 0.64 mm, even though average sand expansion was only 17%; this observation is supported by theoretical evaluation of forces acting on sand during backwash; early idea that 50% expansion is required for good backwashing is not supported by research.
Effect of backwash on filter effluent quality
Effect of backwash rate and backwash duration on quality of water produced by sand filters has been investigated on plant scale; best water quality was produced following backwash rates of 16.7 gpm/sq ft in filters with sand of effective size of 0.64 mm, even though average sand expansion was only 17%; this observation is supported by theoretical evaluation of forces acting on sand during backwash; early idea that 50% expansion is required for good backwashing is not supported by research.
Effect of backwash on filter effluent quality
ASCE -- Proc (J Sanitary Eng Div)
Johnson, R.L. (author) / Cleasby, J.L. (author)
1966
14 pages
Article (Journal)
English
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