2. Find the threshold particle size that will be completely removed by a settling basin that has an overflow velocity of

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2 Find The Threshold Particle Size That Will Be Completely Removed By A Settling Basin That Has An Overflow Velocity Of 1 (10.13 KiB) Viewed 13 times

2 Find The Threshold Particle Size That Will Be Completely Removed By A Settling Basin That Has An Overflow Velocity Of 2 (31.78 KiB) Viewed 13 times

2. Find the threshold particle size that will be completely removed by a settling basin that has an overflow velocity of V. -0.25 mm/s. The particles are spherical (0 - 1) with specific gravity SG - 1.4 and water has a temperature of T=22°C. What will be the detention time in the basin if it has a depth H - 3.0 m. Resolve the problem if V, -0.10 m/s.
7. Design the inlet (influent) structure of problem 6(Q -0,105 m'/). Let the inlet structure consists of i) a tapered influent channel that runs across the entire width of the tank with an average velocity of 0.3 m/s, water depth of 0.4 m and total depth of 0.6 m; ii) Twelve (12) submerged square orifices of size 0.12 0.12 m made on the inside wall of the influent channel to distribute the flow uniformly into the settling tank; and illa baffle wall at a distance of 0.8 m from the orifices, 0.56 m deep below the invert of the influent channel and its top end is 0.05 m below the water surface in the tank to spread out the flow evenly and thereby prevent direct currents. Find the tapered influent channel width, bead loss across the influent structure, velocity under the baffle. Draw a plan and longitudinal section for the influent structure 8. Design the outlet (effluent) structure of problem 6 6 (-0,105 m'/). Let the outlet structure consists of i) an effluent channel that runs across the entire width of the tank with an average velocity of 0.3 m/s, water depth of 0.4 and depth below the launder bottom is 0.6 m; and ii) 90' V-notch weirs with x.-0.2 m center to center apart, attached from both sides to 3 launders extended along the basin with width bt. - 0,3 m, length L - 6,6 m spacing X 4.0 m apart. The top edge of the weirs plate must be at least 0.03 m above the water level in the basin and the crests of the weirs must be at least 0.1 m above the front water depth in the launder. Determine the number of weirs and water depth hw above their crests, the water depth at the front and end of the launder and its cross section dimensions; and the effluent channel width and height. Draw the plan and longitudinal section of the effluent structure.