Wastewater of 30ft°/s with a biochemical oxygen demand (BOD) of 55mg/I, and dissolved oxygen (DO) of 3.3mg/l enters a river where the flow is 125ft/s with an ultimate BOD of 7.0 mg/l, and DO of 6.8mg/l. The downstream has an average velocity of 0.8ft/s. Calculate the minimum DO level and its distance in miles downstream using the oxygen sag equation. Assume kı = 0.046 per day and k2 = 0.304 per day. The saturation DO = 8.5mg/l. (1 mile = 5280ft) ii At what distance downstream would the DO level of the river be equal to 6.10 mg/l? How much should the wastewater DO be increased to maintain a minimum DO of 4.8mg/l anywhere along the river. Assuming that the BOD of the wastewater and the river flow remains the same?

Wastewater of 30ft°/s with a biochemical oxygen demand (BOD) of 55mg/I, and dissolved oxygen (DO) of 3.3mg/l enters a river where the flow is 125ft/s with an ultimate BOD of 7.0 mg/l, and DO of 6.8mg/l. The downstream has an average velocity of 0.8ft/s. Calculate the minimum DO level and its distance in miles downstream using the oxygen sag equation. Assume kı = 0.046 per day and k2 = 0.304 per day. The saturation DO = 8.5mg/l. (1 mile = 5280ft) ii At what distance downstream would the DO level of the river be equal to 6.10 mg/l? How much should the wastewater DO be increased to maintain a minimum DO of 4.8mg/l anywhere along the river. Assuming that the BOD of the wastewater and the river flow remains the same?

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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Question

Wastewater of 30ft°/s with a biochemical oxygen demand (BOD) of
55mg/I, and dissolved oxygen (DO) of 3.3mg/l enters a river where the
flow is 125ft/s with an ultimate BOD of 7.0 mg/l, and DO of 6.8mg/l.
The downstream has an average velocity of 0.8ft/s.
Calculate the minimum DO level and its distance in miles
downstream using the oxygen sag equation. Assume kı =
0.046 per day and k2 = 0.304 per day. The saturation DO =
8.5mg/l. (1 mile = 5280ft)
ii
At what distance downstream would the DO level of the river
be equal to 6.10 mg/l?
How much should the wastewater DO be increased to
maintain a minimum DO of 4.8mg/l anywhere along the river.
Assuming that the BOD of the wastewater and the river flow
remains the same?

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