ExampleA rectangular sedimentation tank with W=25m, L=50m and h=3m The flowrate = 1500 mh, and the influent particles concentration = 2000mg/1. Thefollowing table shows the percentage of particles as a function of his diameter:Volume of particle (mm)0.0010.0051020150.010.0150.020.025152020Find:1) Settling velocity, if particles density = 2650 kg/ m² and viscosity of water= 1.002*10*N.s/m2) Percentage removal for each particle and total percentage removal3) Sludge depth, if the tank is cleaned one time per month. If percentage ofsolide = 8% and sludge density = 1150 kg/ m4) Effluent concentration particles

Example A rectangular sedimentation tank with w-25m, L-50m and h-3m The flow rate 1500 mh, and the influent particles concentration - 2000mg/1. The following table shows the percentage of particles as a function of his điameter Volume of particle (mm) 0.001 0.005 0.01 0.015 10 20 15 15 0.02 0.025 20 20 Find: 1) Settling velocity, if particles density = 2650 kg/ m² and viscosity of water - 1.002 10*N.s/m 2) Percentage removal for each particle and total percentage removal 3) Sludge depth, if the tank is cleaned one time per month. If percentage of solide - 8% and sludge density = 1150 kg/ m² 4) Effluent concentration particles

Example A rectangular sedimentation tank with w-25m, L-50m and h-3m The flow rate 1500 mh, and the influent particles concentration - 2000mg/1. The following table shows the percentage of particles as a function of his điameter Volume of particle (mm) 0.001 0.005 0.01 0.015 10 20 15 15 0.02 0.025 20 20 Find: 1) Settling velocity, if particles density = 2650 kg/ m² and viscosity of water - 1.002 10*N.s/m 2) Percentage removal for each particle and total percentage removal 3) Sludge depth, if the tank is cleaned one time per month. If percentage of solide - 8% and sludge density = 1150 kg/ m² 4) Effluent concentration particles

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter2: Origin Of Soil And Grain Size

Section: Chapter Questions

Problem 2.14P: A hydrometer test has the following result: Gs = 2.65, temperature of water = 26 C, and L = 10.4 cm...

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Question

Example
A rectangular sedimentation tank with W=25m, L=50m and h=3m The flow
rate = 1500 mh, and the influent particles concentration = 2000mg/1. The
following table shows the percentage of particles as a function of his diameter:
Volume of particle (mm)
0.001
0.005
10
20
15
0.01
0.015
0.02
0.025
15
20
20
Find:
1) Settling velocity, if particles density = 2650 kg/ m² and viscosity of water
= 1.002*10*N.s/m
2) Percentage removal for each particle and total percentage removal
3) Sludge depth, if the tank is cleaned one time per month. If percentage of
solide = 8% and sludge density = 1150 kg/ m
4) Effluent concentration particles

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(ii) Consider a primary sedimentation tank (PST) in a water treatment plant with surface overflow rate of 4000 litres/hr/m². What percentage of particles of diameter: (a) 0.05 mm (b) 0.02 mm will be removed in this tank at 20°C? [Assume Stoke's law is valid] Assume at 20°C: Density of water 1000 kg/m³. Density of particle = 2650 kg/m³. g = 9.81 m/s². kinematic viscosity of water (v) = 1.10 × 10-6 m²/s.
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.
A sedimentation basin in a water treatment plant has a length = 50 m, width = 10 m, and depth = 4 m. Particle density = 1.1x10 kg/m'; water density = 10' kg/m2; and dynamic viscosity = 1.307x10-3 N.sec/m2. What is the flow rate, Q, that would remove 70% of particles with a diameter of 0.4 mm?
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
Problem 2.61
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
Please solve example 2 and 1
A primary clarifier is to be designed to treat a municipal wastewater. The influent to the clarifier has a flow rate of 7570 m³/d and a total suspended solids concentration of 320 mg/L. A laboratory settling test was performed with the following results: Suspended Solids Concentration (mg/L) at Given Depths Sampling Depth (m) Time (min) 0.61 1.22 246 2.44 272 243 1.83 3.05 10 230 262 282 20 157 195 230 253 30 115 160 211 221 230 45 90 134 163 179 195 60 48 102 131 154 170 90 29 58 86 115 141 (a) Determine the design overflow rate and detention time assuming 65% of the suspended solids are to be removed. Use typical scaling/safety factors as appropriate. (b) Determine the required diameter (to the nearest 0.1 m) and the required depth (to the nearest 0.01 m) for the clarifier.
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.
Please answer all 1. List the three corrections which should be applied to the hydrometer readings. 2. Why is it important to remove the hydrometer from the measuring cylinder between readings? 3. A hydrometer test has the following results; Gs = 2.70, temperature = 240C, and L = 92 mm at 60 minutes after the start of sedimentation. Calculate the diameter of the smallest-size particles that have settled beyond the zone of measurement at that time (use the table in the lab manual to find, A=0.0128). D(mm) = A sqrt( L(cm) / t(min) )
Settling column analysis of flocculation particles: A column analysis of a flocculating suspension is run in the apparatus shown below.the initial solids concentration is 250mg/L.the resulting matrix is shown below.what will be the overall removal efficiency of a settling basin which is 3m deep with a detention time of 1 h and 45 min? Time of sampling.min Depth (m) 30 60 90 120 150 180 0.5 133* 83 50 38 30 23 1.0 180 125 93 65 55 43 1.5 203 150 118 93 70 58 2.0 213 168 135 110 90 70 2.5 220 180 145 123 103 80 3.0 225 188 155 133 113 95 *Result of suspended solids test on sampel C,mg/L N 寸|n