The BOD just downstream from awastewater pipe is 12.9 mg/L and theDO (dissolved oxygen) is 8.6 mg/L. Thesaturated value of dissolved oxygen is9.6 mg/L, the deoxygenation constant(kd) is 0.21/day, the reaeration constant(kr) is 0.42. Find the time where oxygendeficit is at a maximum and find theminimum value of DO.

Answered: The BOD just downstream from a…

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 BOD just downstream from a
wastewater pipe is 12.9 mg/L and the
DO (dissolved oxygen) is 8.6 mg/L. The
saturated value of dissolved oxygen is
9.6 mg/L, the deoxygenation constant
(kd) is 0.21/day, the reaeration constant
(kr) is 0.42. Find the time where oxygen
deficit is at a maximum and find the
minimum value of DO.

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Step 1

Given,

$\begin{array}{rcl} B O D j u s t d o w n s t r e a m f r o m w a s t e w a t e r p i p e, L & = & 12.9 m g / l \\ D O a t j u s t d o w n s t r e a m f r o m w a s t e w a t e r p i p e & = & 8.6 m g / l \\ I n i t i a l o x y g e n d e f i c i t, D_{o} & = & (12.9 - 8.6) m g / l = 4.3 m g / l \\ S a t u r a t e d v a l u e o f d i s s o l v e d o x y g e n, D O_{s a t} & = & 9.6 m g / l \\ D e o x y g e n a t i o n c o n s \tan t, k_{d} & = & 0.21 / d a y \\ R e a e r a t i o n c o n s \tan t, k_{r} & = & 0.42 / d a y \end{array}$

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