4. (10 points) An oxygenation study was conducted on tap water at 20°C with the results in the table below. Determine th

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4 10 Points An Oxygenation Study Was Conducted On Tap Water At 20 C With The Results In The Table Below Determine Th 1 (143.46 KiB) Viewed 56 times

4. (10 points) An oxygenation study was conducted on tap water at 20°C with the results in the table below. Determine the approximate Kia for the aerator. What would be the DO at 25 minutes? If this aerator achieves a steady state DO = 2 mg/L in tests using wastewater, calculate the respiration rate of the microbes in the tank (assume a=0.8, B=0.95). Using this respiration rate, a wastewater flow rate of 9,000 m3/d, and tank volume of 2250 m3 what mass of oxygen transfer is required per day for respiration by the biomass? Calculate the rate of oxygen transfer required to increase the DO of the influent from 0.2 mg/L to the operating concentration of 2 mg/L. Calculate the power required (in W) to supply enough oxygen for the wastewater if this type of aerator transfers oxygen at an energy efficiency of 0.8 kg O2/kw-h. Time (min) DO (mg/L) 0 0 2 1.79 5 3.84 10 6.06 15 7.34 20 8.07 30 8.75 45 9.02 60 9.07 120 9.08 240 9.08