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03-10a

# 03-10a - Announcements Office Hours o Deborah Mondays:1 4pm...

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Announcements • Office Hours: o Deborah – Mondays:1– 4pm; and Wednesdays: 2 – 5pm • Prelim Review Session most likely on Monday…

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0 5 10 15 20 25 30 35 40 0 1 2 3 4 5 6 7 8 9 10 11 Time (days) BOD(L) (mg/L) L 5 = 16 mg/L BOD 5 20 = Y 5 = 40 – 16 = 24 mg/L Ultimate BOD (L) = L 0 = 40 mg/L ∆ DO (mg) = Y 5 × V = 24 (mg/L) × 0.2 (L) = 4.8 mg Quiz 3 Ultimate BOD (L) -- L 0 = 30 0 C 20 0 C
Practice Problem A small pond that was ice-covered during the winter months is to be used a temporary storage area for an aquaculture facility. During the winter months biological activity has caused the DO to drop to zero. In an attempt to get the pond ready for aquaculture production the influent stream to the pond is saturated with oxygen at 9.2 mg/L (C*) as soon as the ice cover is gone. The pond is located on a hill top where there is a fairly steady wind blowing across its surface. The average wind speed is 10 km/hr. The pond volume is 3500 m 3 . Inflow and outflow rate equals 20 m

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03-10a - Announcements Office Hours o Deborah Mondays:1 4pm...

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