Question

environmental engineering wastewater treatment. waste water treatment.

1- In a 2 steps cascade aeration, each step increases oxygen concentration from 10 % to 30 % of saturation level. If the initial oxygen concentration is 20 % of saturation level and minimum oxygen is required to be 5 mg/L at the end of aeration, is the system efficient or not? Show your calculations. Inlet water temperature is 15 C (Cs = 10.2 mg/L)

2- Design flocculation tanks (2 tanks, 5 compartments for each) for the flow rate of 600 m3/hour.

-Select & control G&T values.

-Calculate dimensions (width-length-depth)

water treament.

water treatment

Answer 1

1.sincequestion number was not mentioned i solved 1st question

minimum oxygen concentration after end of aeration is 4.08mg/L<5mg/L

Not efficient