Answer the following questions regarding the ideal settling tank and particle settling[Pertinent data: water and particle densities are 1 and 1.2 g/cm3, respectively. Waterviscosity is 0.01 g cm-1 sec-1.], assume the sedimentation is in laminar regime.(a) How long does it take for a particle with 60 μm diameter to settle for 3 meters ofvertical distance?(b) If the settling tank has an design overflow rate of 25 m3/(m2 day), will theparticle in part (a) be definitely removed, partially removed, or not removed?Why?(c) How do you increase the removal efficiency of a settling tank?

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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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Problem Set 2: 5. A cubical sample of San Francisco Bay mud (a soft marine silty clay) has been prepared for testing in a true triaxial device. The dimensions of the sample are 76 mm by 76 mm by 76 mm. The sample has a moisture content (w) of 68.5% and a moist density (r) of 1.44 g/cm³. The average specific gravity of solids (G,) is 2.55. Determine (a) the void ratio (e) and degree of saturation (S), (b) the moist density (g) and moisture content (w) if the soil becomes saturated at the same total volume, and (c) the density (p) of the soil if all pore fluid is dried off with no change in total volume. Provide the Phase Diagram.
Q- A suspension of sand like particles in water with particles of diameter 0.10 mm and below is flowing into a settling tank at 0.10 m³/s. Assume g=9.81 m/s², specific gravity of particles=2.65, and kinematic viscosity of water=1.0105x102 cm²/s. Find the minimum surface area (in m²) required for this settling tank to remove particles of size 0.06 mm and above with 100% efficiency.
soil هفصشبكطودذؤ
Example 5.2: - Formation water sample with solids concentrations of calcium (Ca) = = 460 ppm, sulfate (SO4) = 1,400 ppm, and Na plus Cl = 19,000 ppm. %3D Find Equivalent NaCl solution in ppm.
PART IV: PERMEABILIT Y PROBLEM A For a constant head laboratory test on a fine sand, the following are the given values : • Length of the specimen • Di ameter of the specimen 14.0 inches 3.25 inches He ad difference 25.0 inches Water collected in 2.50 mins Void ratio A. Compute for the hydraulic conductivity of the soil in in/sec. B. Determine the discharge velocity through the soil in in/sec. c. Determine the seepage velocity in in/sec. 0.065 cubic inches 0.45
****PROVIDE STEP BY STEP SOLUTION SOLVING H1 AND H2 VALUES in part B***** A constant head permeability test is performed on soil that is 2 cm x 2 cm square, and 2.5cm long. The head difference applied during the test is 20 cm and 7 cm3 is collected over a time of 100 sec. Provide step by step solution. a) Compute the permeability based on these test conditions and results. b) A falling head test is conducted on the same soil specimen at the same time (t1 – t2 = 100 sec), and the standpipe diameter is 0.8 cm. If the average head during the test should be 18 cm, what are h1 and h2 values, provide step by step solution solving h1 and h2 values.
Which of the following is not a mode of field flow fractionation? a. Viscosity b. Sedimentation c. Flow d. Thermal
• Q-3. Settling characteristics of a conceritrated suspension C = 3000 mg/t were deterrmined in a laboratory study. The suspension was settled in a colurmn 100-centimeters high, aind thé height of the interface h, was recorded with tirme Time, minutes 100 79 60 10 15 38 20 25 23 15 30 12 35 40 50 7.5 Calculate the area required to achieve clarification and to yield a thickeried sludge concentration of 25,000 mg/f- for an inıfluent flow rate of 5 mgd.
Show calculation on how to determine the average coefficient of permeability of the sand sample at 20°C. Also show calculations on how to determine the discharge the K1 and Average K1
2. A constant head laboratory permeability test an o fines and gives the following values Length of specimen - 254 mm Diameter of specimen -63.5 mm Head difference=457 mm Water collected in 2 min -0.51 cm^3 Determine these values o. Hydraulic conductivity, k, of the soil (cm/sec) b. Discharge velocity (cm/sec) c. Seepoge velocity (cm/sec) The void ratin of the soil specimen is 0.46.
1. Determine the effective size (d10, in mm) and the uniformity coefficient (UC) for the sand filter media characterized by the sieve analysis results presented in the following table. Sieve opening size (mm) 1.41 1.19 1.00 0.84 0.71 0.59 0.50 0.42 0.35 0.30 % Weight Passing 100 100 94 83 63 35 18 11 8 0
Problem: For a constant laboratory permeability test on a fine sand, the following data are given: Length of specimen - 16 cm Diameter of specimen - 9.6 cm Constant head difference - 50 cm Volume of water collected in 4 min - 420 cc Void ratio of the soil specimen - 0.55 A.) Determine the hydraulic conductivity of the soil in cm/sec B.) Determine the discharge velocity in cm/sec C.) Determine seepage velocity in cm/sec

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