A flocculator that is 100 ft long, 50 ft wide, and 20ft deep houses four, horizontal paddlewheels. Each paddlewheel has four symmetrical arms with fibre glass boards, 6.5 ft from the shaft to the centre of the board rotating at 1.5 rpm. Paddles are 42 ft long and 8 inches wide. The water treatment plant processes 25 MGD of water. Assume that the mean water velocity is 25% of lb-s² the paddle velocity and Co equals 1.8 and μ and p are equal to 2.735 x 10-5 13 and 1.936 ft² respectively. Determine: a) Velocity of paddle blades (ft/s). b) Total power input (hp). c) Velocity gradient (s:¹). d) Detention time (min) e) G₂

A flocculator that is 100 ft long, 50 ft wide, and 20ft deep houses four, horizontal paddlewheels. Each paddlewheel has four symmetrical arms with fibre glass boards, 6.5 ft from the shaft to the centre of the board rotating at 1.5 rpm. Paddles are 42 ft long and 8 inches wide. The water treatment plant processes 25 MGD of water. Assume that the mean water velocity is 25% of lb-s² the paddle velocity and Co equals 1.8 and μ and p are equal to 2.735 x 10-5 13 and 1.936 ft² respectively. Determine: a) Velocity of paddle blades (ft/s). b) Total power input (hp). c) Velocity gradient (s:¹). d) Detention time (min) e) G₂

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

A flocculator that is 100 ft long, 50 ft wide, and 20ft deep houses four, horizontal paddlewheels.
Each paddlewheel has four symmetrical arms with fibre glass boards, 6.5 ft from the shaft to
the centre of the board rotating at 1.5 rpm. Paddles are 42 ft long and 8 inches wide. The water
treatment plant processes 25 MGD of water. Assume that the mean water velocity is 25% of
lb-s²
the paddle velocity and Co equals 1.8 and μ and p are equal to 2.735 x 10-5 ¹3 and 1.936¹
ft²
respectively. Determine:
a) Velocity of paddle blades (ft/s).
b) Total power input (hp).
c) Velocity gradient (s-¹).
d) Detention time (min)
e) G₂

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Step 1 Flocculator design

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Step 2 Calculate Velocity of blades

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Step 3 Calculate the Total power input

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Step 4 Calculate the Velocity gradient

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Step 5 Calculate the Detention time

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