The discharge from a food processing plant is the only source of BOD in a river. The oxygensag curve shows a minimum DO concentration of 3.0 mg/L. The DO concentrationimmediately downstream of the discharge is at saturation (10.0 mg/L). Other characteristics ofthe system are as follows: u = 60 miles/day; kr = 0.80 days-1; kd = 0.20 days-1.a. Currently the food processing plant does not treat the waste. What percent removal ofthe BOD would be required to ensure that the DO of the river at any locationdownstream of the plant is always greater than 5.0 mg/L?b. How far downstream would the lowest DO levels occur?c. What ultimate BOD concentration of the mixture of the river and waste immediatelydownstream of the discharge would result in a minimum DO concentration of 5.0mg/L?
The discharge from a food processing plant is the only source of BOD in a river. The oxygen
sag curve shows a minimum DO concentration of 3.0 mg/L. The DO concentration
immediately downstream of the discharge is at saturation (10.0 mg/L). Other characteristics of
the system are as follows: u = 60 miles/day; kr = 0.80 days-1; kd = 0.20 days-1.
a. Currently the food processing plant does not treat the waste. What percent removal of
the BOD would be required to ensure that the DO of the river at any location
downstream of the plant is always greater than 5.0 mg/L?
b. How far downstream would the lowest DO levels occur?
c. What ultimate BOD concentration of the mixture of the river and waste immediately
downstream of the discharge would result in a minimum DO concentration of 5.0
mg/L?
Trending now
This is a popular solution!
Step by step
Solved in 5 steps with 3 images
