Design the structural components * of a rapid sand filter for the village of Waffle. The maximum day flow rate is 8,700 m3/d. The design criteria and sand analysis are given below. Assume a 375 mm diameter pipe from the gullet is to carry the wash water at a velocity of 1.2 m/s. Verify that the sand meets the GLUMRB recommendations for E and U. Adjust the grain size distribution if the sand does not meet the specification.
The following is to be provided to complete this portion of the filter design:
Clean bed headloss
Backwash velocity
Depth of expanded bed
Number of filter beds
Area of an individual filter bed
Plan dimensions
Backwash trough layout
Maximum backwash water trough flow rate
Backwash trough dimensions
Backwash trough weir elevation above undisturbed bed
Gullet dimensions
Backwash water volume
Backwash tank volume
Maximum allowable filtration headloss
Depth of filter box
Backwash tank low water elevation
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