3.A completely mixed pond of volume, V, has an influent steady-state flow, Q, entering with aBOD, concentration of L, and a dissolved oxygen (D.O.) concentration of C, (see theillustration below). Assume a first-order BOD decay constant, k,, and a first-order reaerationcoefficient of k, as indicated:Q = 107 L/dayk2Co= 0.23 day4 mg/L D.O.%3DV = 2 x 108 liters0.20 day%3DC* =10 mg/L D.O. (saturation level of D.O.)Lo.6V.C.La) What would be the allowable maximum influent BOD, concentration (L) in order tomaintain the steady-state dissolved oxygen concentration in the pond (C) above 2 mg/L D.O.?b) If the initial BOD, concentration in the pond (at time 0) is 5 mg/L what will the BOD,concentration be three days after the waste input is begun (with L equal to the amount youarrive at in part (a))?

Answered: Image /qna-images/answer/cc8e635e-38f1-4650-b8d8-95a5ea298d22.jpg

A completely mixed pond of volume, V, has an influent steady-state flow, Q, entering with a BOD, concentration of L, and a dissolved oxygen (D.O.) concentration of C, (see the illustration below). Assume a first-order BOD decay constant, k,, and a first-order reaeration coefficient of k, as indicated: Q = 107 L/day V = 2 x 108 liters 0.20 day k2 0.23 day %3D Co 4 mg/L D.O. %3D C* =10 mg/L D.0. (saturation level of D.O.) %3D do V.C,L Lo.6 Q L, C a) What would be the allowable maximum influent BOD, concentration (L) in order to maintain the steady-state dissolved oxygen concentration in the pond (C) above 2 mg/L D.O.? b) If the initial BOD, concentration in the pond (at time 0) is 5 mg/L what will the BOD, concentration be three days after the waste input is begun (with L equal to the amount you arrive at in part (a))?

A completely mixed pond of volume, V, has an influent steady-state flow, Q, entering with a BOD, concentration of L, and a dissolved oxygen (D.O.) concentration of C, (see the illustration below). Assume a first-order BOD decay constant, k,, and a first-order reaeration coefficient of k, as indicated: Q = 107 L/day V = 2 x 108 liters 0.20 day k2 0.23 day %3D Co 4 mg/L D.O. %3D C* =10 mg/L D.0. (saturation level of D.O.) %3D do V.C,L Lo.6 Q L, C a) What would be the allowable maximum influent BOD, concentration (L) in order to maintain the steady-state dissolved oxygen concentration in the pond (C) above 2 mg/L D.O.? b) If the initial BOD, concentration in the pond (at time 0) is 5 mg/L what will the BOD, concentration be three days after the waste input is begun (with L equal to the amount you arrive at in part (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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Question

3.
A completely mixed pond of volume, V, has an influent steady-state flow, Q, entering with a
BOD, concentration of L, and a dissolved oxygen (D.O.) concentration of C, (see the
illustration below). Assume a first-order BOD decay constant, k,, and a first-order reaeration
coefficient of k, as indicated:
Q = 107 L/day
k2
Co
= 0.23 day
4 mg/L D.O.
%3D
V = 2 x 108 liters
0.20 day
%3D
C* =10 mg/L D.O. (saturation level of D.O.)
Lo.6
V.C.L
a) What would be the allowable maximum influent BOD, concentration (L) in order to
maintain the steady-state dissolved oxygen concentration in the pond (C) above 2 mg/L D.O.?
b) If the initial BOD, concentration in the pond (at time 0) is 5 mg/L what will the BOD,
concentration be three days after the waste input is begun (with L equal to the amount you
arrive at in part (a))?

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