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Water is flowing with a velocity of 0.5 m/s in a pipeline having uniform cross sectional areaand a length of (90+N) km, calculate the water retention time in the pipe line. (4 Points)
(a) If (1.5+N*0.1) mg/L chlorine concentration is maintained for 1 hour, then what is theCT value? (b) If one has to reduce the time of exposure to (25+N) min, what should be thechlorine concentration to achieve the same CT value? (c) If you have 105organisms per mL and if you achieve 3 log removal, how many organisms will remain in water? (9 Points)
There are two different suspended particles with settling velocities of 0.1 and 0.2 mm/s.The particles are present at 60:40 ratio with an overflow rate of (15+N*0.2) m/d. What isthe overall removal efficiency of the system? (6 Points)
Determine the volume of a flocculation tank and the required power input using thefollowing parameters: Water retention time is 15 minutes, water flow rate is (110+N*2)litre/sec, water temperature is 200 C. Assume the tank has equal length, width and depth. (5Points)
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