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.

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.

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter16: Soil Improvement And Ground Modification

Section: Chapter Questions

Problem 16.10P

See similar textbooks

Similar questions

A rectangular sedimentation tank is designed with a depth of 3.5 mand a detention time of 1 h. Is the design suffcient to achieve complete removal of particles with a diameter of 0.01 mm? Specifc gravity of the particles is 2.65. The fow rate and temperature of waterare 10,000 m3/d and 20°C, respectively. At 20°C, density of water is998 kg/m3 and dynamic viscosity of water is 10–3 kg/m·s. State anyassumptions you make to calculate your results.
Design a circular type sedimentation tank: A city must treat about 20,000 m^3/d of water and analysis indicate that an overflow rate of 25m/d will produce satisfactory removal at a depth of 5.0m. Determine the size of required settling tank. please be fast
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.
Determine the overflow rate, hydraulic detention time and the size of spherical sand particle (2.6g/cm3) which is 100% removed by 10 primary sedimentation tanks that operate in parallel to treat a flow of 0.7 m3/s with the following dimensions Length = 70m, width = 12 m and depth=3m. Assume 20°C for the water temperature.
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?
A batch test on the sedimentation of slurry containing 200kg / m (C.) is carried out experimentally where the initial height of sediment zone is 900mm (h.). The following data are assumed as follows: Underflow concentration- 1200kg / m Feed flow rate-3m / min The relation between setting velocity (u) and height of sediment zone (h.) Can be represented by the following equation: u (mm / min) -0.0178 * h - 3.22 Where the h have taken the values: 700,300,260,200 and 180 mm. Graphically, find the critical rate of sedimentation then the cross section area of tank.
For a flocculent suspension, determine the removal efficiency for a basin 3.0 m deep with an overflow rate of 0.05 m/min using the laboratory settling data presented in the following table.
Design a rectangular sedimentation tank (L/W is 4) for a max weekly flow with a hydraulic retention time of 3 hours, and a surface overflow rate of 50 m3/m2.d for a town with a population of 250,000 and average daily water demand is 450 L/capita. The monthly, weekly, and daily factors are 1.2, 1.4, and 1.8, respectively. The area of each tank should be limited to 8000 m2. Determine the tank dimensions (L,W, and D) and the number of tanks needed. What is the horizontal flow-through velocity in the rectangular basin
If the settling velocity of a particle is 0.70 cm/s and the overflow rate of a horizontal flow clarifier is 0.8 cm/s, what percent of the particles are retained in the clarifier?
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?
During the design storm, a detention basin receives a flow rate of 0.2 m3/s. Assuming a sediment specific gravity of 2.65, determine :a) the surface area needed to capture particles 0.10 mm in diameter and larger, and b) the resulting overall trapping efficiency of the basin given the sediment distribution listed below: Size Range (mm) Representative Diameter (mm) Fractional Content 0.001-0.010 0.006 0.25 0.010-0.100 0.055 0.40 0.100-0.500 0.300 0.35
The town of Parit Raja has an existing horizontal-flow sedimentation tank with an overflow rate of 18.5 m3 /d.m2 . It is required to remove particles that have settling velocities of 0.15 mm/s, 0.18 mm/s, and 0.5 mm/s. Determine the percentage of removal that should be expected for each particle in an ideal sedimentation tank.