WATER RESOURCES ENGINEERING
3rd Edition
ISBN: 9781119490579
Author: Mays
Publisher: WILEY
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Chapter 19, Problem 19.4.2P
To determine
The return period that maximizes the expected annual net benefits.
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Average sludge production reported by members of the National Association
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BOD₁ = UBOD (1− e−k₁t)
A) What is the rate constants k for cBOD?
B) What is the rate constants k for nBOD?
C) Why aren't nitrifiers prevalent in the raw wastewater?
Treatment ponds have long hydraulic residence times (HRTs), so nitrifiers
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E) Why does your curve have the shape you give it?
100
80
BOD, mg/L
60
60
40
40
20
20
0
0
10
20
30
40
40
Time, d
50
60
6-19 Determine the LRFD design strength and the ASD allowable strength of the section shown
if snug-tight bolts 3 ft on center are used to connect the A572-Grade 50 angles. The two
angles, 5×31/2 × 5/16, are oriented with the long legs back-to-back
(2 L5 × 31/2 × 5/16 LLBB) and separated by 3/8 inch. The effective length,
(Lc)x = (Lc)y = (Lc)z
=
14 ft. (Ans. 65.4 k LRFD; 43.5 k ASD)
Figure P6-19
x
x
2L5×32×5/16 LLBB
Chapter 19 Solutions
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