Answered: The following dissolved-oxygen values…

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

23.23 The following dissolved-oxygen values were found after 5 days of incubation in 305-mL BOD bottles: 8.2, 8.0, and 8.1 in three blank samples and 7.4, 6.5, 4.9, 1.5, and 0.0 mg/L in bottles containing 0.5, 1, 2, 4, and 8 mL of sample, respectively. The 0-day dissolved oxygen of the sample was 6.5 mg/L. What is the 5-day BOD of the sample?

Why in the solution he did do only the two samples, 2 milliliters, and 4 milliliters?

And if you have another solution for the same question that would be great.

Now,
BL=
8.248.0 +8.1
= 8.1 mg/h
3
Do depletion in 0.5 and I'ml sample are sufficient (cmg/L)
Do remaing in 8 mL sample is too large.
ye only two sample.
BODS (2m²) = 8.1-4.9
(305)
= - 488 mg/L
= 503 mg/L
BOD5 (4ml) = 8.1-1.5
(3515)
using avessage of the two acceptable values.
:: BOD5
488 +503
2
BOD5
496 mg/L
: The 5-day BOD of the sample is [496 mg/L
=

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