2. A cross flow horizontal shaft, paddle wheel tapered flocculation basin with 3 compartments square in profile having equal depths are to be designed for a flow of 6.5 MGD. Each horizontal shaft will have 4 paddle wheels and each paddle will have 6 blades each having a width of 6 inch and length of 10 ft. 12in space will be left between each blade. Detention time is 50 min. The G values determined from lab. tests for 3 compartments are; G1=50sec-1, G2-25 sec-1, G3-15 sec-1. These give an average G value of 30 sec-l. The compartments are to be separated by baffle fences. The basin should be 50ft in width. The speed of blades relative to the water is 3 quarters of the peripheral blade speed. Determine: a) The Gt value, b) The basin dimensions, c) The paddle-wheel design,
2. A cross flow horizontal shaft, paddle wheel tapered flocculation basin with 3 compartments square in profile having equal depths are to be designed for a flow of 6.5 MGD. Each horizontal shaft will have 4 paddle wheels and each paddle will have 6 blades each having a width of 6 inch and length of 10 ft. 12in space will be left between each blade. Detention time is 50 min. The G values determined from lab. tests for 3 compartments are; G1=50sec-1, G2-25 sec-1, G3-15 sec-1. These give an average G value of 30 sec-l. The compartments are to be separated by baffle fences. The basin should be 50ft in width. The speed of blades relative to the water is 3 quarters of the peripheral blade speed. Determine: a) The Gt value, b) The basin dimensions, c) The paddle-wheel design,
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:2. A cross flow horizontal shaft, paddle wheel tapered flocculation basin with 3
compartments square in profile having equal depths are to be designed for a
flow of 6.5 MGD. Each horizontal shaft will have 4 paddle wheels and each
paddle will have 6 blades cach having a width of 6 inch and length of 10 ft.
12in space will be left between each blade. Detention time is 50 min. The G
values determined from lab. tests for 3 compartments are; GI=50sec-1, G2=25
sec-1, G3=15 sec-1. These give an average G value of 30 sec-I. The
compartments are to be separated by bafle fences. The basin should be 50ft in
width. The speed of blades relative to the water is 3 quarters of the peripheral
blade speed.
Determine:
a) The Gt value,
b) The basin dimensions,
c) The paddle-wheel design,
d) Power to be imparted to the water in each compartment,
e) The rotational speed of cach horizontal shaft in rpm
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