what is the detention time (days) for a tank 50 ft high and 40 ft diameter and flow of 0.5 MGD? a. 9 days D. 1.25 days c. 0.94 days d. 2.5 days e. 0.24 MGD

A municipal wastewater treatment plant uses a circular clarifier. It receives 12 million gallons per day of wastewater. The clarifier radius is 25 ft and the depth is 29 ft. What is the detention time in the clarifier? What is the overflow rate? (1 cubic foot = 7.48 gallons)

A company is trying to build a new plant in a location near to a stream. You been asked to find out the impact of the discharged wastewater from the proposed plant on that stream that has characteristics shown in the Table below. The expected plant effluent data is shown in the same Table. Considering K₁=0.23 d¹ and K₂= 0.4 d, what is the DO in the critical point Variable Flow rate (m³/s) Ultimate BOD (mg/L) Stream 0.50 Plant 0.15 19 30 7.84 3.00 (20 20 b) 3.62 mg/L c) 4.86 mg/L d) 5.61 mg/L Dissolved oxygen (mg/L) Temperature (°C) a) 2.53 mg/L

Can you please solve step by step I can't seem to understand it.