5. You are asked to design a single media filtration system for a drinking water facility. The design flow rate is 20 mgd (million gallons per day). The ideal filter velocity for your system is 8 m/hr. You design a set of filters to be used in parallel. Each filter box has a surface area of 50 m². a. How many filters do you need to construct? b. Estimate the (clean-filter) head loss in kPa? c. What mass removal (filter efficiency) would you expect for an influent stream that contains equal parts (by mass) of 1, 10 and 100 um particles? You can assume an adhesion efficiency a = 0.7. Sand Effective Size (mm) 0.8 Uniformity Grain Coefficient Density (g/cm³) 2.6 1.2 Porosity 0.4 Layer Thickness (m) 1.5

5. You are asked to design a single media filtration system for a drinking water facility. The design flow rate is 20 mgd (million gallons per day). The ideal filter velocity for your system is 8 m/hr. You design a set of filters to be used in parallel. Each filter box has a surface area of 50 m². a. How many filters do you need to construct? b. Estimate the (clean-filter) head loss in kPa? c. What mass removal (filter efficiency) would you expect for an influent stream that contains equal parts (by mass) of 1, 10 and 100 um particles? You can assume an adhesion efficiency a = 0.7. Sand Effective Size (mm) 0.8 Uniformity Grain Coefficient Density (g/cm³) 2.6 1.2 Porosity 0.4 Layer Thickness (m) 1.5

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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Question

5. You are asked to design a single media filtration system for a drinking water facility. The
design flow rate is 20 mgd (million gallons per day). The ideal filter velocity for your
system is 8 m/hr. You design a set of filters to be used in parallel. Each filter box has a
surface area of 50 m².
a. How many filters do you need to construct?
b. Estimate the (clean-filter) head loss in kPa?
c. What mass removal (filter efficiency) would you expect for an influent stream
that contains equal parts (by mass) of 1, 10 and 100 um particles? You can
assume an adhesion efficiency a = 0.7.
Sand
Effective
Size
(mm)
0.8
Uniformity
Coefficient
1.2
Grain Porosity
Density
(g/cm³)
2.6
0.4
Layer
Thickness
(m)
1.5

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Step 1: Mention the given data.

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Step 2: (a) Determine the required number of filters.

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Step 3: (b) Determine the head loss.

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Step 4: (c) Determine the filter efficiency.

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