Environmental engineering Q1 A wastewater treatment plant a

Environmental engineering

Q1:. A wastewater treatment plant a clarifier treating 0.04 m\'/s of water. The 5 m wide, 25 m long and 3.5 m deep. Determine: a) b) e) The detention time Surface Overflow Rate Weir loading rate assuming the weir length is 2.5 times the clarifier width. Q2:. An aerobis oxidation nond has a vot

Solution

Amount of water, clarifier treats = 0.04 m³/s

Width of the clarifier = 5m

Length of the clarifier = 25m

Depth of the clarifier = 3.5m

a) Detention time (T) = Volume the clarifier/Discharge

=437.5/0.04

=10937.5 sec

=10937.5/3600

= 3.04 hrs

b) Surface over flow rate (SOR) = Discharge/ Cross sectional area of clarifier

= 0.04/125

= 3.2 * 10^-4 m³/m²/s

Weir length = 2.5* clarifier width =12.5 m

c) Weir loading rate = Discharge/ weir length

=0.04/12.5

=3.2*10^-3 m³/m/s