1. Water is flowing with a velocity of 0.5 m/s in a pipeline having uniform cross sectional area
    and a length of (90+N) km, calculate the water retention time in the pipe line. (4 Points)
  2. (a) If (1.5+N*0.1) mg/L chlorine concentration is maintained for 1 hour, then what is the
    CT value? (b) If one has to reduce the time of exposure to (25+N) min, what should be the
    chlorine concentration to achieve the same CT value? (c) If you have 105
    organisms per mL and if you achieve 3 log removal, how many organisms will remain in water? (9 Points)
  3. 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 is
    the overall removal efficiency of the system? (6 Points)
  4. Determine the volume of a flocculation tank and the required power input using the
    following 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. (5
    Points)

Sample Solution

This question has been answered.

Get Answer