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.
****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
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
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 Problem: For a falling head permeability test, the following are given: Length of Soil Specimen - 200mm Area of Soil Specimen - 1000mm^2 Area of Stand pipe - 40mm^2 Head Difference at time t = 0 min - 500mm Head Difference at time t = 3 min - 300mm A.) Compute hydraulic conductivity of the soil in cm/sec B.) Compute the seepage velocity if the porosity is 0.25 in cm/sec C.) What is the head difference at time t = 100 sec in mm
Afalling-head permeability test is performed on a fine-grained soil. The soil sample has a length of 120 mm and a cross-sectional area of 600 mm2. The water in the standpipe flowing into the soil is 0.60 m above the top of the sample at the start of the test. It falls 50 mm in 30 minutes. The standpipe has a cross-sectional area of 200 mm2. (a) Make a sketch of the described conditions. (b) What is the coefficient of permeability in millimeters per second? (c) What is the coefficient of permeability in feet per minute? (d) On the basis of the calculated value for khyd, what is the probable soil type?
A water filtration unit is made of uniform-size sand particles of 0.4 mm diameter with shape factor of 0.84 and specific gravity of 2,55. The depth of the filter bed is 0.70 m and the porosity is 0.35. The filter bed is to be expanded to a porosity of 0.65 by hydraulic backwash. If the terminal settling velocity of sand particles during during backwash is 4.5 cm/s, the required backwash velocity is
A cylindrical soil sample 50 mm in diameter and 200 mm in height is used as thepermeameter in a falling head permeability test setup. In one minute of observation, thehydraulic head in the 10 mm diameter standpipe through which test water went reducedfrom 900mm to 500 mm. During that time, 1.5 liters of water were collected in the graduate. Calculate the soil sample's permeability coefficient in cm/s.
X1
2.28. A groundwater is being considered for use as a domestic supply. The water has a temperature 15°C and the following chemical analysis: CONCENTRATION, CONSTITUENT Ca+? 190 Mg*2 Na* Fe*2 84 75 0.1 0.2 Cd+2 HCO, So, 260 64 CO,-2 30 440 NO,- 35 a. Use an anion-cation balance to determine if the sample analysis is reasonable. b. What is the hardness of the water?
Problem 2 Assume a clay liner with the following properties: thickness is 0.9 m, hydraulic conductivity of the liner is 1 x 107 cm/sec, diffusion coefficient is 5 x 106 cm²/sec, and porosity of 0.45. The leachate head on the liner is 30 cm o o For R = 1, 2, 4 Determine the solute concentration ratio (C/Co) at: 0.6 m at day 10, 100, 200, 300, 400. (Make plots) W R=1, 2, 4, Determine the concentration ratio at the bottom of the liner after: 200 days

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