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This question was created from CVG 2132-Lec 13 - Water Quality - Editted.pptx


Example: The only source of BOD in a river is untreated wastes that are being
discharged from a food processing plant. The resulting oxygen sag curve has a
minimum DO value of 3.0 mg/L somewhere downstream of the discharge. The DO of
the food processing waste is sufficiently high and the DO of the river at the discharge
location remains at saturation. The water temperature of the mixed stream is 15.5 C.
(a) Find the location of the lowest DO value downstream of the discharge. The
reaeration coefficient is equal to 0.80/day and the deoxygenation coefficient is
0.20/day. The average velocity of the stream is 96,560 m/d.
(b) What is the ultimate BOD at the point of mixing between the stream and the
(c) What is the ultimate BOD at the point of mixing between the stream and the
discharge that is required for the DO to remain above 5 mg/L and enable a
"healthy" aquatic community to be maintained through the entire stream.
(d) What level of wastewater treatment plant (primary, secondary or tertiary) is
required to treat this waste?

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