3.Using the settling curve provided and given information, a)Determine the solids loading in kg/m²/d. b) Calculate the overflow rate inm³/m²/d. c) Find the thickener surface area required in m². d) Determine thesettling velocity of the particles (Ah/t). Assume that initial concentration is1,500 mg/L, thickened concentration is 10,000 mg/L and flow of 2,500 m³/d.Interface height (m)0.70.650.6Settling Curve0.550.50.450.40.350.30.250.20.150.10.05001020203040Time (min)50508.60708880

To solve this problem, we'll use the settling curve provided along with the given information. Let's…

Answered: 3. Using the settling curve provided…

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter5: Soil Improvement And Ground Modification

Section: Chapter Questions

Problem 5.11P

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A silt particle with a density of 2500 kg/m3 and terminal settling velocity (vs) of 1.9 m/hr is entering a rectangular sedimentation basin which has a depth (H) of 4 m. The entire flow rate of 21000 m3/day has to flow through the basin. The temperature of operation is 20C and the density of water at this temperature is 998 kg/m3 and the viscosity is 0.001 kg m-1 s-1. Note: Volume of a rectangular basin = L x W x H.1) What is the size of the particle?2) What will be the volume of the rectangular sedimentation basin needed to remove the particle from the water, assuming 100% removal?
The result of the liquid limit tests where N is the no of blows and w is the water content in % are given as follows: Trial 1 N=11 w=53.9; Trial 2 N=15 w=50.6; Trial 3 N=23 w=48.1; Trial 4 N= 30 w= 46; Trial 5 N= 46 w=43.3; Trial 6 N= 53 w=41. The PL= 25 and the in situ moisture content is 50%. Determine the liquidity index. a.0.91 b.1.25 c.0.56 d.0.59 With FBD if necessary
A slurry flowing at a rate of 8000 m3 /d is fed to a rectangular sedimentation tank to separate the sand particles (SG=2.65) from water (ρ=1000 kg/m3 , µ=1 cP). The critical settling velocity was chosen to be that of a particle with a diameter of 0.02 mm. Calculate the minimum detention time required (in h) and the dimensions of the tank (in m). Assume that the depth is 3.5 m and the L:W is 3:1.
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A rectangular sedimentation tank has dimensional proportions of 10:1:3 (L:W:H). If sedimentation is done in batch, the tank can cater 1080 m^3 in one hour, while the detention time for a continuous settling is 15 minutes on the same tank. a) During batch sedimentation, how many batches is done in an hour? b) Solve the dimensions of the tank. c) If the critical settling velocity is 0.003m/s, how many percent of the solids will be settled down? d) If the influent has a solids concentration of 230 mg/L and the effluent is 90% of the influent, compute the solids concentrations both at the underflow and the overflow. e) Determine the filter area if the filter loading rate is 2.3 gal/d.ft.
The result of the liquid limit tests where N is the no of blows and w is the water content in % are given as follows: Trial 1 N=11 w=53.9; Trial 2 N=15 w=50.6; Trial 3 N=23 w=48.1; Trial 4 N= 30 w= 46; Trial 5 N= 46 w=43.3; Trial 6 N= 53 w=41. The PL=25 and the in situ moisture content is 45%. Determine the liquid limit. O a. 41 O b. 47 O c. 43 O d. 50
1a. Calculate the terminal settling velocity of a 15 μm clay mineral particle with a density of 2.65 g / cm3 in 20 ˚C water.1b. 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).1c. What is the smallest diameter clay mineral particle that can be removed in the settling basin for the conditions above?1d. 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.
A column analysis of a flocculating suspension is run in the apparatus shown below. Theinitial solids concentration is 320 mg/L. The resulting matrix is shown below. What willbe the overall removal efficiency of a settling basin which is 2.5 m deep with a detentiontime of 2 hr?
A falling head permeability test was run on a soil sample 11.9cm in diameter and 11.3cm long. The head at the start of the test was 95cm and falss to 77cm after 36.5mins. The diameter of the standpipe was 1.44cm. Determine the flow rate. (cm^3/min) through the soil. Use head loss method. Use stored value. Answer in 5 decimal places.
Q- If a soil has a voids ratio of 0.68 and water percolating through it has a discharge velocity of 1.35*10-2cm/s. Calculate its seepage velocity.
A treatment plant has a horizontal flow sedimentation basin with a depth of 5 m, width of 7.5m, length of 45 m, and process flow rate of 450 m3 /h. What removal percentage should be expected for particles that have settling velocities of 1.0 and 2.5 m/h? What is the minimum size of particles that would be completely removed? Assume the particle density is 2650 kg/m3.The water temperature is 15 oC.

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