1. A flocculation basin is to be designed for a water treatment plant, and the design flow is 49,200 m³/day. The basin is to be a cross-flow horizontal-shaft paddle-wheel type with a detention time of 45 min and a Gt value between 50,000 and 100,000. Tapered flocculation is to be provided, and three compartments of equal depth in series are to be used. The compartments are to be separated by slotted, redwood baffle fences, and the basin floor is level. The G values are to be 50, 20 and 10 s¹. The flocculation basin is to have a width of 27.43 m to adjoin the settling basin. There are to be four paddle boards per arm (and two arms per wheel), and the boards should have a clear spacing of 850 mm. Determine: a. The basin dimensions. b. The paddle-wheel design. c. The power to be imparted to the water in each compartment and the total power required for the basin. d. The range in rotational speed for each compartment if 1:4 variable speed drives are employed.

1. A flocculation basin is to be designed for a water treatment plant, and the design flow is 49,200 m³/day. The basin is to be a cross-flow horizontal-shaft paddle-wheel type with a detention time of 45 min and a Gt value between 50,000 and 100,000. Tapered flocculation is to be provided, and three compartments of equal depth in series are to be used. The compartments are to be separated by slotted, redwood baffle fences, and the basin floor is level. The G values are to be 50, 20 and 10 s¹. The flocculation basin is to have a width of 27.43 m to adjoin the settling basin. There are to be four paddle boards per arm (and two arms per wheel), and the boards should have a clear spacing of 850 mm. Determine: a. The basin dimensions. b. The paddle-wheel design. c. The power to be imparted to the water in each compartment and the total power required for the basin. d. The range in rotational speed for each compartment if 1:4 variable speed drives are employed.

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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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.

Question

1. A flocculation basin is to be designed for a water treatment plant, and the design flow
is 49,200 m³/day. The basin is to be a cross-flow horizontal-shaft paddle-wheel type
with a detention time of 45 min and a Gt value between 50,000 and 100,000. Tapered
flocculation is to be provided, and three compartments of equal depth in series are to
be used. The compartments are to be separated by slotted, redwood baffle fences, and
the basin floor is level. The G values are to be 50, 20 and 10 s¹. The flocculation
basin is to have a width of 27.43 m to adjoin the settling basin. There are to be four
paddle boards per arm (and two arms per wheel), and the boards should have a clear
spacing of 850 mm. Determine:
a. The basin dimensions.
b. The paddle-wheel design.
c. The power to be imparted to the water in each compartment and the total
power required for the basin.
d.
The range in rotational speed for each compartment if 1:4 variable speed
drives are employed.

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