Assume that the Urcaguary wastewater (Problem 9–35) also contains 3.0 mg · L−1 of ammonia nitrogen with a stream deoxygenation rate of 0.900 day−1 at 12°C. What is the amount of ultimate carbonaceous BOD (in kg · day−1), that Urcaguary can discharge and still meet the DO level of 4.00 mg · L−1 at a point 8.05 km downstream? Assume also that the theoretical amount of oxygen will ultimately be consumed in the nitrification process.
Assuming that the mixed oxygen deficit (Da) is zero and that the ultimate BOD (Lr) of the Manco Capac River above the wastewater outfall from Urcaguary is zero, calculate the amount of ultimate BOD (in kg · day−1) that can be discharged if the DO must be kept at 4.00 mg · L−1 at a point 8.05 km downstream. The stream deoxygenation rate (kd) is 1.80 day−1 at 12°C, and the reaeration rate (kr) is 2.20 day−1 at 12°C. The river temperature is 12°C. The river flow is 5.95 m3 · s−1 with a speed of 0.300 m · s−1. The Urcaguary wastewater flow is 0.0130 m3 · s−1.
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