The sedimentation tank is due for cleaning and its volume will be drained into half. The tank has a uniform cross-section area of 10m by 10m and currently filled at depth of 6 meters. If the orifice drainer has a coefficient of 0.90 and diameter of 5 centimeters, how much time in seconds would it take to reach the desired level for cleaning?
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The sedimentation tank is due for cleaning and its volume will be drained into half.
The tank has a uniform cross-section area of 10m by 10m and currently filled at depth of 6 meters.
If the orifice drainer has a coefficient of 0.90 and diameter of 5 centimeters, how much time in seconds would it take to reach the desired level for cleaning?
The correct answer has a margin of 10 seconds from the exact answer.
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- A water treatment plant treats 6000 m³ of water per day. As a part of the treatment process, discrete particles are required to be settled in a clarifier. A column test indicates that an overflow rate of 1.5 m per hour would produce the desired removal of particles through settling in the clarifier having a depth of 3.0 m. The volume of the required clarifier, (in m³, round off to 1 decimal place) would beA city is planning to install a new settling tank as an upgrade to their existing water treatment plant. Design a settling tank to remove 65% of the influent suspended solids from their design flow of 0.5 m /s. A batch-settling test using a 2.0 m column and coagulated water from their existing plant yielded the following data: Percent removal as a function of time and depth Sampling time, min Depth, m 5 10 20 40 60 90 120 0.5 41 50 60 67 72 73 76 1.0 19 33 45 58 62 70 74 2.0 15 31 38 54 59 63 71A drainage pipe became completely blocked during/ a storm by a plug of sand, 1.5 m long, followed by another plug of a mixture of clays, silts and sands, 0.5m long, as shown in the attached figure. When the storm was over, the water level above ground was 1 m. The coefficient of permeability of the sand is 2x that of the mixture of clays, silts and sands. a. Calculate the pore water pressure at the center of the sand plug in kPa
- (a) A particular soll sample was run thru a stack a sieves and the data shown below was obtained. Find the hydraulic conductivity in (1) gpd/12 (2) m/day (b) This method of estimating K is sufficient for some purposes, but does not glve an accurate figure of the soll's true hydraulic conductivity, even when weighing errors and graphing errors are considered. 10. Why? Cumulative Cumulative weight in grams Pan # # 6 # 8 8. # 12 54 # 16 99 # 20 166 # 40 215 #70 224 Pan 2382. Please design a Type II settling tank that receives a 1000 m3/day of a waste stream, after flocculation, that displays the following settling behavior. The initial concentration for this test is 500 mg/L. Time (min) 5 10 20 30 40 50 60 75 1 meters 481 418 331 270 225 193 154 133 2 meters 490 456 425 361 325 279 240 198 3 meters 495 483 463 413 369 333 290 259 Concentrations are in mg/L If the required removal rate is 50%, how large should the tank be?A drainage pipe became completely blocked during/ a storm by a plug of sand, 1.5 m long, followed by another plug of a mixture of clays, silts and sands, 0.5m long, as shown in the attached figure. When the storm was over, the water level above ground was 1 m. The coefficient of permeability of the sand is 2x that of the mixture of clays, silts and sands. a. Calculate the pore water pressure at the center of the sand plug in kPa.Calculate the pore water pressure at the center of the mixture of clays, silts and sands in kPa. Find the average hydraulic conductivity in the sand. Find the average hydraulic conductivity in the mixture of clays, silts and sands
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- Design a sedimentation basin for a water treatment plant with the following specifications assuming it is required to supply a city with a population of 50,000 people: Rectangular or square basin • Depth: 7-18 ft ● . • Width: 10-50 ft Detention time: 4-8 hours Flow through velocity: <0.55 ft/min Overflow rate: 400-1,100 gal/day-ft² Draw a figure to show calculated dimensions. You may consider to use SI units in calculations. ● ● Hint: Overflow rate is Flow/Surface Area; Detention time is Volume of tank/Flow rate; and Depth= Volume/Surface areaA 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?Search for reliable sources and identify how the water sample can beclassified in terms of its hardness. Discuss its implications in terms of waterquality.