A granular media filter at a drinking water treatment plant treats clarifier effluent, and the filter run duration averages 3 days when the filtration rate is 3 gpm/ft2 and the turbidity of the water is 5 NTU (Nephelometric Turbidity Units). Filter runs are terminated when a given terminal head loss is reached, e.g., 7 ft. Estimate the filter run duration, for a constant terminal head loss, under the following conditions: a. Filtration rate increases to 5 gpm/ft2 while the turbidity remains 5 NTU. b. Turbidity increases to 10 NTU while the filtration rate remains 3 gpm/ft2 c. Filtration rate increases to 4 gpm/ft2 and turbidity increases to 8 NTU
A granular media filter at a drinking water treatment plant treats clarifier effluent, and the filter run duration averages 3 days when the filtration rate is 3 gpm/ft2 and the turbidity of the water is 5 NTU (Nephelometric Turbidity Units). Filter runs are terminated when a given terminal head loss is reached, e.g., 7 ft. Estimate the filter run duration, for a constant terminal head loss, under the following conditions: a. Filtration rate increases to 5 gpm/ft2 while the turbidity remains 5 NTU. b. Turbidity increases to 10 NTU while the filtration rate remains 3 gpm/ft2 c. Filtration rate increases to 4 gpm/ft2 and turbidity increases to 8 NTU
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A granular media filter at a drinking water treatment plant treats clarifier effluent, and the filter
run duration averages 3 days when the filtration rate is 3 gpm/ft2 and the turbidity of the water is
5 NTU (Nephelometric Turbidity Units). Filter runs are terminated when a given terminal head
loss is reached, e.g., 7 ft. Estimate the filter run duration, for a constant terminal head loss, under
the following conditions:
a. Filtration rate increases to 5 gpm/ft2 while the turbidity remains 5 NTU.
b. Turbidity increases to 10 NTU while the filtration rate remains 3 gpm/ft2
c. Filtration rate increases to 4 gpm/ft2 and turbidity increases to 8 NTU
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