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.
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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.
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- 3-A circular radial-flow tank has a settling zone depth of 3 m and a settling zone area of 500 m2. What is the retention time necessary to remove organic particles with settling velocities of 0.3 mm/s and greater? What flow rate is required through the tank?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.4. A water treatment plant has a sedimentation basin with a width of 10.0 m a depth of 3.0 m, a length of 50.0 m, and a flow rate of 4,000 m³/day. a. What is the terminal settling velocity of a particle with a density of 2.4 g/cm³ and a diameter of 0.010 mm in 20°C water? b. What is the percent removal of the particles in part a) for this basin? ( c. What is the smallest diameter particle (mm) with a density of 2.4 g/cm³ that would be removed by this sedimentation basin?
- 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. ANSWER D AND E I PROVIDED SOME INFORMATION THANK YOU!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.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?
- A settling tank has an overflow rate of 100,000 gal/ft^2 •d. Water carrying sediment of varioussizes enters the tank. The sediment has the following distribution of seIling velocities. What is the gravimetric percentage of sediment particles completely removed? (A) 32%(B) 39%(C) 47%(D) 55%1. You are to design four sedimentation basins which operate in parallel. The total flow influent, coming from the flocculation basin is 24 MGD. Each basin is 30 ft. wide, 240 ft. long and has an effective settling depth of 10 ft. The dynamic viscosity of water is 2.73 E-5 lb/sec/ft2 at 50 degrees Fahrenheit. The kinematic viscosity of the water is 1.41 E-5 ft2/sec. The specific gravity of the particles to be settled is 1.60. a. What is the nominal detention time for sedimentation? b. What is the overflow rate in gal/day/ft2. c. What is the settling velocity (ft/sec) of the smallest discrete particle that will be 100% removed? d. According to Stokes law what is the diameter (ft) of the smallest discrete particle that will be 100% removed? e. What is the horizontal water velocity (ft/min) in the sedimentation basin?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.
- 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.Problem No. 3 A sedimentation tank with 600 m surface area is designed to treat 1100 m'/day of water with influent suspended solid of 150 mg/l. Determine the effluent suspended solids, Due to population increase, the quantity of water increased to 2500 m'/day and it is intended to install another sedimentation tank in parallel with the existing one, determine the surface area of the second tank. The mass fraction remains and corresponding settling velocities of water sample is illustrated in the following table: percent 100 70 50 30 15 Vx 10 m/min 3.0 2.0 1.5 1.0 0.52. 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.