HW: Design a rectangular sedimentation tankthat will treat 1500 m³/d, the smallest particle tobe 100% removed is 0.03 mm in diameter. Thedetention time is 3 hrs, inlet flow velocity is 96m/d, knowing that p of water =1000 kg/m³, μ ofwater =1*10-³ N.s/m², S.G =1.65. Find:(1) Dimensions of the tank.(2) Volume of the settled solid (m³/d) if theconcentration of the suspended solids in the flowis 500 mg/l.

Problem StatementFlow rate (Q): 1500 m3/daySmallest particle size to be 100% removed: 0.03…

Answered: HW: Design a rectangular sedimentation…

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter8: Seepage

Section: Chapter Questions

Problem 8.11P

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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.
I want the solution in less than 15 minutes
Q1) The following data are available for a certain water treatment plant: t=30 min, t=1min, (-120 min, G- 70s, Q 10000 m'/d,, G-2000 s.p=1.002×10 kg/m.s. a) The required rapid mixer power in (kW). b) The required power of slow mechanical mixer in (kW). c) The dimensions of the sedimentation basin of rectangular surface area with (L-4W) and the water depth is 5 m.
3. A sediment laden water is to be treated in a sedimentation tank with Type I settling characteristics. The tank is 35 m. long and 20 m. wide with a depth of 5 m. A controlled constant flow rate of 3.5 m³/s passes through the tank. A particle size analysis has been made and the results are listed in the table below: Dp (m) 0.00005 0.00007 0.00009 0.0001 0.0002 Mass Concentration (mg/L) 100 200 300 200 100 Assume that the particle densities are all 2,000 kg/m³ and the dynamic viscosity of water is 0.001 Ns/m². (a) Determine the effluent particle size distribution and the effluent sediment concentration by using a spreadsheet or writing a QuickBASIC program. (b) Determine the particle removal efficiency (%) of the tank.
Q2: A column analysis for an activated sludge suspension yielded the following: MLSS Conc (mg/l) Settling velocity m/h 1000 2.8 2000 3000 1.2 0.4 4000 0.2 5000 Question 0.1 6000 0.06 The influent MLSS concentration is 2000 mg/l and the flow rate is 4200 m³/d. Determine the size of the clarifier that will thicken the solids to 8000 mg/l.
QUESTION 4 A settling analysis is run on a Type 1 suspension in a laboratory column with a port of 1.9m below the suspension surface. The data obtained are shown below. Time (min) TSS (conc,mg/L) 0 220 3 116 5 98 10 75 20 35 40 10 60 2 What is the theoretical removal efficiency in a settling basin for an overflow of 440 m2/m.day?
Q1:) A circular coagulation basin has a diameter of 2.5 m and it's depth equal to 1.60 m. If the following data are available: Gt=27000, t-30 s, μ-1.003× 10³ kg/m.s,alum dosage=50 mg/l, determine: a) The required mixing power in unit of (kW). b) The daily quantity of alum added in unit of (kg/d). Q2:) The flow described in (Q1) above is to be flocculated in a basin having four flocculators with transverse paddle units. The basin may be a maximum of 6 m wide and 4 m deep to connect to the settling basin. Determine: (1) Basin dimensions: (2) power requirements. μ= 1.002× 10³ kg/m.s The best Gt value for the system has been found to be 5 x 104, and the G value is 40 s¹.
Plz write neat
A sand sample of 35m cm^2 cross sectional area and 20cm long was tested in a constant head permeameter. Under a head of 60 cm, the discharge was 120 ml in 6min. The dry weight of sand used for the test was 1120 g, and Gs= 2.68 A. Determine the hydraulic conductivity in cm/sec. B.Determine the discharge velocity in cm/sec. C. Determine the seepage velocity in cm/sec.
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 -
Round off answer to two decimal places unless otherwise stated in the problem
2. For discrete settling, the experimental data of a wastewater settlement are as follows: the initial concentration of suspended solids Co-400mg/L, the effective water depth H=1.2m. Calculate the total removal rate of particles when Uo=4.0cm/min. Sampling time/min SS concentration mg/L 400 15 208 30 184 45 160 60 132 90 108 120 88

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