Answered: A river is traveling at a velocity of…

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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A river is traveling at a velocity of 0.06 m/s. At x = 0 km, the river has a dissolved
oxygen content of 7.1 mg/L and a BOD5 of 25 mg/L. The deoxygenation rate constant is
0.2/day at 20°C. What is the concentration of organic matter at a distance 11 km downstream
in the river assuming the river stays at a constant temperature of 20°C.

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step 1

Introduction :

Biochemical oxygen demand (BOD) :

BOD is a measurement of the quantity of oxygen required by aerobic microorganisms to decompose waste organic matter in water (those bacteria that live only in an environment containing oxygen).

Given Data :

$\begin{array}{rcl} v e l o c i t y & = & 0.06 m / s \\ x & = & 0 k m \\ d i s s o l v e d o x y g e n D O & = & 7.1 m g / L \\ B O D_{5} & = & 25 m g / L \\ d e o x y g e n a t i o n r a t e & = & 0.2 / d a y \\ t e m p r a t u r e & = & 20 ° C \\ d i s \tan c e L & = & 11 k m \end{array}$

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