A wastewater treatment plant discharges water into a river, and each flow has th

Question

A wastewater treatment plant discharges water into a river, and each flow has the following characteristics:

Parameter/Wastewater/River: [Flow (m3/s)/ 0.3/ 0.9] [Ultimate BOD (mg/L)/ 80.0/ 0] [DOinit (mg/L)/ - /6.0] [kd (day-1)/ - /0.2] [kr (day-1)/ - /0.37] [Speed (m/s)/ - /0.065] [DOsat (mg/L)/ 8.0/ 8.0]

a. Graph DO (in mg/L) as a function of distance in miles. Print out the graph and attach it to your homework (with the proper information in the heading (name, course, etc.)). (Hint: you must account for dilution when considering your ultimate BOD).

b. Using your graph, find minimum downstream DO value that would be expected. (Answer = 2.2 mg/L)

c. How far downstream (in km) would the minimum DO value occur?

Explanation / Answer

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