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a 7. Design the inlet (influent) structure of problem 6 (Q = 0.105 m/s). 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 iii) a 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, head loss across the influent structure, velocity under the baffle. Draw a plan and longitudinal section for the influent structure.
6. Design one unit of plain rectangular sedimentation tanks for a water treatment plant. The unit receives 0 – 0.1 m/s 5% out of this amount is waste (w = 0.05) used to remove the sludge. Assume detention time T. - 4 hr, and the tank has a length 4 times the width with very good performance - 1/8 and bed friction coefficient is f-0.022. The water dynamic viscosity v - 101 mm/s and minimum fraction to be removed by the tank R -0.75 for particles with diameter d = 0.018 mm and specific gravity SG-2.65. Draw a sketch for the linam in the tank
8. Design the outlet (effluent) structure of problem 6 6(Q -0.105 m/s). 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 in) 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 bu=0.3 m, length LL - 6.6 m spacing xi 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 h, 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 efluent structure, the outlet structure