The flow rate of the Madison River is about 500 cubic feet per second (CFS). The Madison River has an ultimate BOD value of 6 mg/L and DO of 4 mg/L. The Madison Wastewater Treatment Plant (WWTP) discharges 10 million gallons per day (MGD) of treated wastewater with an ultimate BOD of 20 mg/L and DO equal to 9 mg/L. [1 cubic foot = 7.48 gal]
What will be an ideal response?
a. What is the BOD [mg/L] immediately downstream of the discharge?
b. What is the DO [mg/L] immediately downstream of the discharge?
c. If the temperature for the mixed water at the point of discharge is 20ºC, what is the initial oxygen deficit in mg/L?
d. If the deoxygenation constant is 0.8 day–1 and the re-aeration rate is 1.4 day–1, what is the critical time [days]?
e. What would the minimum dissolved oxygen concentration in the river be in mg/L?
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