Estimate the removal efficiencies for particles of 0.030mm and 0.015mm, respectively, in thesedimentation tank with an overflow of 2m/m²-h. Discrete settling is assumed for the particles.Furthermore, Stokes' law is assumed to be valid in the determination of the settling velocity (tosimplify the calculation). It is known the specific gravity of the particle is 2.65. The gravityaccelerate rate is 9.8m/s and the water kinematic viscosity is 1×10m?/s. [Stokes' law v =d²(s=1)º118yIf the weight fractions of the 0.030mm and 0.015mm particles in the waster are 30% and 70%,respectively, calculate the total removal efficiency (TRE) of these particles by this tank.

Stokes law for 0.03 mm particles: v=d2S-1g18vfor 0.03 mm particles: d=0.03 mm =…

Answered: Estimate the removal efficiencies for…

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 No. 3 A sedimentation tank with 600 m surface area is designed to treat 1100 m'/day of water with influent suspended solid of 150 mg/l. Determine the effluent suspended solids, Due to population increase, the quantity of water increased to 2500 m'/day and it is intended to install another sedimentation tank in parallel with the existing one, determine the surface area of the second tank. The mass fraction remains and corresponding settling velocities of water sample is illustrated in the following table: percent 100 70 50 30 15 Vx 10 m/min 3.0 2.0 1.5 1.0 0.5
QUESTION 1 For the hydrometer test results after 60 minutes from the beginning of the sedimentation is 42.50 Obtained test results as follows: Gs=2.65 • Temperature, T = 26°C •L = 10.8cm Determine the size (Diameter, D) of the smallest-size particles that have settled beyond the zone of measurement at the time of 60 min?
( Example / A sedimentation tank has width of 20m and height of 3m The Velocity of flow is 5mmls and the Settling Velocity of Smallest particles at Peak Flow rate is 0.38 mm/s Find the volume of tank
-1 (a) (b) The results shown in Table QA1 were obtained by a group of students during a laboratory experiment using a standard Proctor test on granular material. Table QA1 Bulk density Water content (Mg/m³) (%) 2 5 6 8 9 1.91 2.24 2.31 1.99 1.4 Using the data in Table QA1, plot the corresponding compaction curve and determine the air content corresponding to the optimum water content and maximum dry density for this soil. Is the air content within the range normally specified when at optimum values? (Note you may Assume: Gs = 2.7 and pw = 1 Mg/m³) Explain why and when it is essential to determine soil density on construction sites.
2. Determine the efficiency of removing particles of size 50 μm and density 1,100 kg/m², settling in a horizontal sedimentation tank of depth 2m, length 10 m and length to width ratio of 3:1. The flow into the sedimentation tank is 2000 m³/d. The dynamic viscosity (u) can be taken as 1.002 x 10* Pa.S.
A 15 μm clay mineral particle has terminal settling velocity of 0.202 mm with a density of 2.65 g / cm3 in 20 ˚C water.a. Would these particles be completely removed in a rectangular settling basin that has a 10-m width, a 30-m length and a 4-m depth given a flow rate of 2 MGD (million gallons day).b. What is the smallest diameter clay mineral particle that can be removed in the settling basin for the conditions above?c. What is the smallest diameter clay mineral particle that can be removed in the settling basin for winter conditions when the water temp is 5 ˚C
Which of the following are standard procedures used for determining the field unit weight of compaction?I. Sand Cone MethodII. Rubber Balloon MethodIII. Nuclear MethodIV. Falling Head Test Method
3. Using the settling curve provided and given information, a) Determine the solids loading in kg/m²/d. b) Calculate the overflow rate in m³/m²/d. c) Find the thickener surface area required in m². d) Determine the settling velocity of the particles (Ah/t). Assume that initial concentration is 1,500 mg/L, thickened concentration is 10,000 mg/L and flow of 2,500 m³/d. Interface height (m) 0.7 0.65 0.6 Settling Curve 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 0 10 20 20 30 40 Time (min) 50 50 8. 60 70 88 80
Determine the terminal settling velocity (cm/s) of a particle of diameter 0.171 mm and density 1.83 g/cm³. At the water temperature of 12 C, the water density and viscosity may be taken as 1.0 g/cm³ and 1.235 mPa-s, respectively.
Q1) The data in the table below used to design a sedimentation tank with depth=4m and detention time=2hr, the influent flow is 2000L for each minute. 0.004 0.01 0.02 0.03 0.04 0.05 0.063 0.085 0.12 Settling Velocity(cm/sec) Weight fraction 98 95 Greater than size % 8 6 4 3 2 1 0.5 Determine the overall removal efficiency for this tank, s.g. of particle=1.2 u=0.89x10-³N.s/m². Use Ax=0.1. Q2) For the above question find the depth of sludge for each day if the influent solid concentration is 3000mg/L and percentage of solid=8% and sludge density =1.2 ton/m³.
A water treatment plant has a flow rate of 0.6 m³/s. The settling basin at the plant has effective settling volume dimensions of length 20 m, depth 3 m and width 6 m. What % of the particles having a settling velocity of 0.004 m/s is removed?

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