Please answer 4 and 5Consider the design of granular media filters for a water treatment plant with a design flow of 40 MGD.For a filtration hydraulic loading of 5 gpm/ft2 determine the total filter area required for filtration (in square ft). Next, select the number of parallel filters needed, and their length and width (even foot increments), if each filter is square with area of 400 square feet.You choose a filter consisting of 36 inches of sand with an ES of 0.55 mm. The porosity is 0.4. Determine the superficial filtration velocity and the pore velocities in the sand layer.Calculate the detention time (in minutes) through the entire depth of the filterCalculate the clean bed head loss (in feet) for the filter using the Carmen-Kozeny equation. Assume a water temperature of 68 ºF and the design hydraulic loading rate. Use the media effective size for media diameter in the calculation.Estimate the filtration efficiency for a particle that is 4 microns in diameter.

Answered: Consider the design of granular media…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Please answer 4 and 5

Consider the design of granular media filters for a water treatment plant with a design flow of 40 MGD.

1. For a filtration hydraulic loading of 5 gpm/ft2 determine the total filter area required for filtration (in square ft). Next, select the number of parallel filters needed, and their length and width (even foot increments), if each filter is square with area of 400 square feet.
2. You choose a filter consisting of 36 inches of sand with an ES of 0.55 mm. The porosity is 0.4. Determine the superficial filtration velocity and the pore velocities in the sand layer.
3. Calculate the detention time (in minutes) through the entire depth of the filter
4. Calculate the clean bed head loss (in feet) for the filter using the Carmen-Kozeny equation. Assume a water temperature of 68 ºF and the design hydraulic loading rate. Use the media effective size for media diameter in the calculation.
5. Estimate the filtration efficiency for a particle that is 4 microns in diameter.

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