3. Problem 6.4 (modified), Masters and Ela, Introduction to Environmental Engineering and Science, 3rd Ed.: a. What is the terminal settling velocity of a particle with a specific gravity of 1.47 and a diameter of 0.015 mm in 20 °C water? b. Would particles of the size in part (a) be completely removed in a settling basin with a width of 8.0 m, a depth of 6.0 m, a length of 40 m and a flow rate of 3,500 m³/day? c. What is the smallest diameter particle of specific gravity 1.47 that would be removed in the sedimentation basin described in part (b)?
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- 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.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.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. Design a rectangular sedimentation tank to treat 2.4 million litres of raw water per day. Thedetention period may be assumed to be 3 hours. [5]b. Discuss any three types of particle settling in the sedimentation tank. [6]c. Discuss one mechanism of controlling particulate matter. [3]d. Discuss three reasons what determine the location of manholes.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) )The discharge of water collected from a constant head permeameter in a period of 15 minutes is 500 ml. The internal diameter of the permeameter is 5 cm and the measured difference in head between two gauging points 15 cm vertically apart is 40 cm. Calculate (a) the coefficient of permeability (mm/s), (b) If the dry weight of the 15-cm long sample is 4.86 N and the specific gravity of the solids is 2.65, calculate the seepage velocity (mm/s).
- You are evaluating the performance of a settling basin within a drinking water treatment plant. (a) What is the terminal settling velocity of a particle with a specific gravity of 1.4 and a diameter of 0.010 mm in 20 ̊C water?(b) Would particles of the size in part a be completely removes in a settling basin with a width of 10.0 , a depth of 3.00 m, a length of 30.0 m, and a flow rate of 7,500 m3/d? Answer yes or no, and prove with calculations. (c) What is the smallest diameter particle (in micrometers) of specific gravity 1.4 that would be removed in the sedimentation basin described in part b?Silt-containing wastewater flowing at a rate of 24.2x103 m3/day was fed to a sedimentation tank with dimensions L= 39 m, W= 8m, H=3m The SG of the particles is 2.68. What would be the smallest particle size (in µm) that can be removed from this operation? Assume flow is within Stokes region and that the particles are spherical. The density and viscosity of water is 1000 kg/m3 and 0.001 kg/m-s, respectively.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.A water treatment plant processes 21,000 cubic meters of water per day. Assume two types of flocculated particles enter the basin. You are asked to evaluate the performance of a rectangular sedimentation basin that has dimensions of depth=4 m, width= 6 m, and length= 40 m. The first type of particles has a settling velocity of 0.5 m/hr and the other type has a settling velocity of 1.8 m/hr. What percent of particles are removed for each of the two types of particles?Q In a cell with upper and lower bounds that are 1.4 m and 1.2 m above the datum, determine the average water content. The following criteria apply to it: n =1.5, α = 0.06, zt = 2 m, zWT = 1 m, θs = 0.45, and θr = 0.08.