Answered: Distance (miles) 30 60 90 120 150 180…

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

A wastewater treatment plant discharges its effluent into a river at time 0 days as shown in the figure below.
a) What is the initial DO deficit? Show your work.
b) What is the critical DO concentration and the critical time?
c) If the DO concentration of the river was at saturation before the effluent was discharged into it, and the DO concentration in the river after mixing is 8.0 mg/L as shown in the figure, what was the DO concentration of the wastewater treatment plant effluent. The flowrate of the river is 80 cfs downstream of the mixing point, and the flowrate of the effluent discharge

Distance (miles)
30
60
90
120
150
180 210
240
DO sat
9.0
6.0
2.0
1
2
3
4
Time (days)
DO (mg/L)

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