The ultimate BOD of a river at the confluence of the river and a sewage outfall is 50 mg/L and the DO is at the saturation value of 9.0 mg/L after mixing. The deoxygenation (or decay) rate coefficient (Ka) is 0.3 d' and the reaeration rate coefficient (K;) is 0.9 d''. The river is flowing at a velocity of 48 miles/day and the only source of BOD is from the sewage discharge. Find the critical distance downstream (in miles) at which DO is a minimum. b. Find the minimum DO (in mg/L). c. If a wastewater treatment plant is to be built, what fraction of the BOD would have to be removed from the sewage to assure a minimum of 5.0 mg/L everywhere downstream? а.

The ultimate BOD of a river at the confluence of the river and a sewage outfall is 50 mg/L and the DO is at the saturation value of 9.0 mg/L after mixing. The deoxygenation (or decay) rate coefficient (Ka) is 0.3 d' and the reaeration rate coefficient (K;) is 0.9 d''. The river is flowing at a velocity of 48 miles/day and the only source of BOD is from the sewage discharge. Find the critical distance downstream (in miles) at which DO is a minimum. b. Find the minimum DO (in mg/L). c. If a wastewater treatment plant is to be built, what fraction of the BOD would have to be removed from the sewage to assure a minimum of 5.0 mg/L everywhere downstream? а.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.

Question

The ultimate BOD of a river at the confluence of the river and a sewage outfall is 50 mg/L and
the DO is at the saturation value of 9.0 mg/L after mixing. The deoxygenation (or decay) rate
coefficient (Ka) is 0.3 d-' and the reaeration rate coefficient (K,) is 0.9 d-'. The river is flowing at
a velocity of 48 miles/day and the only source of BOD is from the sewage discharge.
Find the critical distance downstream (in miles) at which DO is a minimum.
b. Find the minimum DO (in mg/L).
If a wastewater treatment plant is to be built, what fraction of the BOD would have to be
removed from the sewage to assure a minimum of 5.0 mg/L everywhere downstream?
d. Develop a plot of the DO sag curve for the original condition (parts a & b) and for part c.
You can develop this plot by hand or use a computer program but you must show enough
points to capture the entire sag curve.
а.
с.

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