3. A settling tank has an overflow rate of 100,000 gal/ft2.d. Water carrying sediment of various sizes enters the tank. The sediment has the following distribution of settling velocities. Settling velocity (ft/min) Mass fraction remaining 10.0 0.54 5.0 0.45 2.0 0.35 1.0 0.20 0.75 0.10 0.50 0.03 What is the gravimetric percentage of sediment particles completely removed? (A) 32% (B) 39% (C) 47% (D) 55%

3. A settling tank has an overflow rate of 100,000 gal/ft2.d. Water carrying sediment of various sizes enters the tank. The sediment has the following distribution of settling velocities. Settling velocity (ft/min) Mass fraction remaining 10.0 0.54 5.0 0.45 2.0 0.35 1.0 0.20 0.75 0.10 0.50 0.03 What is the gravimetric percentage of sediment particles completely removed? (A) 32% (B) 39% (C) 47% (D) 55%

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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3. A settling tank has an overflow rate of 100,000 gal/^2 d. Water carrying sediment of various sizes enters the tank. The sediment has the following distribution of settling velocities. Settling velocity (ft/min) 10.0 5.0 2.0 1.0 0.75 0.50 Mass fraction remaining 0.54 0.45 0.35 0.20 0.10 0.03 I What is the gravimetric percentage of sediment particles completely removed? In percent %
A 1800 ft³ sedimentation tank with a water depth of 12 feet is used to remove sand particles from water by settling. The specific gravity of the sand particles is 2.65 and the diameter of the particles is 0.001 cm. The temperature of the water is 60°F (15.6 °C). Adjust both the kinematic viscosity and the density of water accordingly. a. Calculate the settling velocity (m/hr). b. Assuming this settling velocity is the overflow rate, calculate the hydraulic residence time (hr)
A settling tank has an overflow rate of 100,000 gal/ft^2 •d. Water carrying sediment of varioussizes enters the tank. The sediment has the following distribution of seIling velocities. What is the gravimetric percentage of sediment particles completely removed? (A) 32%(B) 39%(C) 47%(D) 55%
A settling basin is designed with a loading rate of 25 m³ /m².day. The depth of basin is 2 m deep, Determine the overall removal obtained for a suspension for data are shown below. Time (min) 80 100 130 200 240 420 F 111 78 27 The specific gravity of the particles is 1.2 and water = 0.997, and µ= 1.027. 0 60 Concentration (ppm) 300 189 180 168 156
Estimate the settling velocity of sediment particles parameter 0.05 mm and of specific gravity 2.65, when settling in water medium with v = 1x10-°m2 / sec.
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A glass container with pervious bottom containing fine sand in loose state (void ratio = 0.8) is subjected to hydrostatic pressure from underneath until quick condition occurs in the sand. If the specific gravity of sand particles = 2.65, area of cross-section of sand sample= 10 cm2 and height of sample = 10 cm, compute the head of water in cm required to cause quicksand condition. a.9.17 b.0.45 c.7.29 d.0.9
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Problem H: For Problem 28 to 29. In a constant head permeability test the following are given L= 250 mm and A=105 cm?. If the value of k = 0.014 cm/secand flow rate of 120 cm³/min which isto be maintained. %3D 28) What is the head difference, hin the specimen? a) 44 cm b) 24 cm c) 33.75 cm d) 34.0 cm 29) Determine the dischargevelocity in cm/sec? a) 0.017 b) 0.009 c) 1.019 d) 0.019
6. The sludge hopper of a sedimentation tank is approximated as a truncated square prism provided with an orifice of 100 mm dia. at its bottom as shown in the figure. The sludge is being discharged through the orifice Determine the time taken for emptying the hopper. Assume Cd=0.62. 2m 1m E im -
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