Bundle: Sustainable Energy, 2nd + Mindtap Engineering, 1 Term (6 Months) Printed Access Card
2nd Edition
ISBN: 9781337896535
Author: Richard A. Dunlap
Publisher: Cengage Learning
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Chapter 1, Problem 15P
To determine
Find the rotational speed of the solid disk in rpm.
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Average sludge production reported by members of the National Association
of Clean Water Agencies is 0.7 tons of sludge TS per MG wastewater
treated.
Assume that the organic matter (VS) in the sludge contains 10% N and that
the ratio of VS/TS in sludge is 0.85.
A) How many mg/L of N are removed from the wastewater due to
assimilation?
B) If the raw wastewater contained 50 mg/L total N, what percent was
removed via assimilation?
C) Why is this a disappointing result in terms of nutrient recovery and reuse
goals?
The two-part curve is from a BOD bottle test conducted over 50 days (i.e.,
ultimate UBOD). The nitrifying bacteria numbers grew to significance by
Day-8.There is a lower cBOD curve and an upper nBOD curve.
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
are a significant part of the microbiome.
D) Sketch a 50-d BOD curve similar to the above, but for a pond effluent
sample. The sum of the c and n BODs at 50 days is 30 mg/L.
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 1 Solutions
Bundle: Sustainable Energy, 2nd + Mindtap Engineering, 1 Term (6 Months) Printed Access Card
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