(a)Sketch a typical Streeter-Phelps oxygen-sag curve and state its limitations.dD(b)The rate of change of the dissolved oxygen deficit, ", is the net effect of the rate ofdtre-aeration, given as – k D, and the rate of oxygen utilization, given as k,Le ,where ko, ka and Lo are the re-aeration rate constant, the decay constant, and theultimate BOD, respectively.Write the expression for the rate of change of the dissolved oxygen deficit. Then arguewhy the maximum deficit, De, occurring at the critical time, to, is given by:ka LeD.k.

Limitations: The model ignores BOD removal by sedimentation, the conversion of suspended BOD to a…

(a) Sketch a typical Streeter-Phelps oxygen-sag curve and state its limitations. (b) dD ,is the net effect of the rate of dt The rate of change of the dissolved oxygen deficit, re-aeration, given as-k,D, and the rate of oxygen utilization, given as k,Le, where ka, ka and Lo are the re-aeration rate constant, the decay constant, and the ultimate BOD, respectively.

(a) Sketch a typical Streeter-Phelps oxygen-sag curve and state its limitations. (b) dD ,is the net effect of the rate of dt The rate of change of the dissolved oxygen deficit, re-aeration, given as-k,D, and the rate of oxygen utilization, given as k,Le, where ka, ka and Lo are the re-aeration rate constant, the decay constant, and the ultimate BOD, respectively.

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Analysis and Procedures for Material Selection

The term material selection means to select the right material for various engineering applications. There are various engineering materials available and each has different individual properties. Thorough knowledge of the material properties and behavior is crucial in the design process. For instance, a structural member, such as a beam, is used to support vertical shear loads by the building itself. To withstand such loads, the material of the beam must possess adequate strength and stiffness to resist any deformation that might lead to the formation of cracks.

Question

(a)
Sketch a typical Streeter-Phelps oxygen-sag curve and state its limitations.
dD
(b)
The rate of change of the dissolved oxygen deficit, ", is the net effect of the rate of
dt
re-aeration, given as – k D, and the rate of oxygen utilization, given as k,Le ,
where ko, ka and Lo are the re-aeration rate constant, the decay constant, and the
ultimate BOD, respectively.
Write the expression for the rate of change of the dissolved oxygen deficit. Then argue
why the maximum deficit, De, occurring at the critical time, to, is given by:
ka Le
D.
k.

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