Water inflow to the sedimentation tank is 0.1X m³/sec, water retention time is 1X0 min and depth of the tank is 2.X m. What is the volume and surface area of the tank? What is the overflow rate of tank in m³/day.m² and what is a removal efficiency of particles with the sedimentation velocity 0.0003m/s.X=6 Hand written solution only

Water inflow to the sedimentation tank is 0.1X m³/sec, water retention time is 1X0 min and depth of the tank is 2.X m. What is the volume and surface area of the tank? What is the overflow rate of tank in m³/day.m² and what is a removal efficiency of particles with the sedimentation velocity 0.0003m/s.X=6 Hand written solution only

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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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 hydrometer test has the following result: Gs = 2.65, temperature of water = 26 C, and L = 10.4 cm at 45 minutes after the start of sedimentation (see Figure 2.25). What is the diameter D of the smallest-size particles that have settled beyond the zone of measurement at that time (that is, t = 45 min)? Figure 2.25 ASTM 152H type of hydrometer placed inside the sedimentation cylinder (Courtesy of Khaled Sobhan, Florida Atlantic University, Boca Raton, Florida)
1. You are trying to remove 10.0 um diameter particles in a water treatment plant. The water is at 15°C, and the particle density is 1.35 g/mL. The plant treats 0.100 m³/s of water. It is proposed to use a 3 m deep, rectangular sedimentation tank with a length to width ratio of 6:1. a. What is the minimum required width of the basin? b. What would be the minimum required width if the water in this problem was 25°C, instead of 15°C? omil novig c. If you designed the system for 15°C (as in part a) and then the plant received 30°C water, what percent of particles would be removed by the system, assuming no change to the particles themselves?
Determine overall removal obtained for a sedimentation tank having following data: 32.6 m/day Surface overall rate 1 G 1.2 dyanic viscosity 1.027 centipoise Pw 0.997 g/cm³ Particle size 0.1 mm 0.08. m 0.07 mm 0.06 0.04 0.02 0.01 Weight fraction 10% 15% 40% 70% 93% 99% 100% greater in size Use Stoke's law to find out the settling velocity.
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.
Lecturer: Roozbeh Safaeian Amoly Duration: 90 minutes 1. A soil sample 15 cm in diameter is placed in a tube 3 m long. A constant supply of water is allowed to flow into one end of the soil at A, and the outflow at B is collected by a beaker as shown in the figure. Determine (a) hydraulic gradient, (b) flow rate, (c) average velocity, (d) seepage velocity if e 0.7, and (e) hydraulic conductivity, if the average amount of water collected is 3 cm for every 20 seconds. 10 kPa 1.4 m F 1 5m-- 15m-- 1sm-l- 1.5m-| B A Soil 2m Exit Datum 1.75 m 15m
Еxample A rectangular sedimentation tank with W=25m, L=50m and h=3m. The flow rate = 1500 m/h, and the influent particles concentration = 2000mg/l. The following table shows the percentage of particles as a function of his diameter: Volume of particle (mm) 0.001 10 0.005 20 0.01 15 0.015 15 0.02 20 0.025 20 Find: 1) Settling velocity, if particles density = 2650 kg/ m’ 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/ m³ 4) Effluent concentration particles
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?
5. A permeameter of 8 cm diameter contains a sample of length 35 cm. Attachments are made it to enable conducting either constant head test or falling head test. The stand pipe used for conducting falling head test has a diameter of 2.5 cm. When constant head test was conducted the loss of head was 100 cm measured on a length of 25 cm. If the rate of flow was 2.7 cc/sec, calculate the coefficient of permeability of soil. If a falling head test is conducted on the same sample in the permeameter find the time taken for head to fall from 150 cm to 100 cm.
SITUATION 2: From the following data of a given sieve analysis: Sieve No. # 4 Opening Percent (mm) 4.76 2.38 2.0 0.71 0.25 0.149 0.074 passing 90 #8 #10 #25 # 60 #100 # 200 64 58 30 22 10 4 9. Determine size(D10). а. 0.20 с. 2.0 10. Determine Cu. а. 10 C. 20 the effective grain b. 0.15 d. 0.09 b. 15 d. 5
Lecturer: Roozbeh Safaeian Amoly Duration: 90 minutes 1. A soil sample 15 cm in diameter is placed in a tube 3 m long. A constant supply of water is allowed to flow into one end of the soil at A, and the outflow at B is collected by a beaker as shown in the figure. Determine (a) hydraulic gradient, (b) flow rate, (c) average velocity, (d) seepage velocity if e 0.7, and (e) hydraulic conductivity, if the average amount of water collected is 3 cm' for every 20 seconds. 10 kPa ttt 1.4 m 1.5m- 15m- 15m-- 1.5m- B Soil C. Exit Datum 2m 1-5 m 15m 11:00 口 4) 2.06.2021
III. Using Atterberg's Plasticity Determination Method Determinethe following; a) Plot the Flow Curve and b) Determine the Flow Index c) Computethe Liquid Limit d) and if the Plastic Limit wa. uetermined as PL = 17.545 % what is the Plasticity Index ? Number of Blows Moisture Content,% 15 38.589 20 35.712 29 28.556 32 24.670