Question

BOD is naturally consumed in rivers. A stream (flowing at 3 MGD with no BOD) has...

BOD is naturally consumed in rivers. A stream (flowing at 3 MGD with no BOD) has a point source of pollution (untreated sewage outfall) flowing at 2 MGD that has 300 mg/l of BOD. How will this affect the stream quality? Answer the questions below. You will need to use both mass balance and kinetic equations. Also: stream velocity = distance / time (= 3 miles / hr). Show all work.

Determine the flow rate of the stream downstream of the outfall - My answer is  5 MGH

Determine the BOD concentration of the stream just downstream of the outfall - My answer is 120 Mg/L

Using the data below, determine if the natural rate of BOD consumption is a zero, 1st or 2nd order reaction rate - My answer is 1st order with a line slope of 0.1067.

How much BOD will be left in the stream after it has flowed for 24 hours (assume no more dilution)? Please explain the formal to figure out the answer. Thanks for the help.

Data

BOD

t(hr)

mg/l

0

120

5

75

10

40

15

25
Engineering   Civil-Engineering   
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