Structural Analysis, SI Edition
6th Edition
ISBN: 9780357030981
Author: Aslam Kassimali
Publisher: Cengage Learning US
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Chapter 7, Problem 4P
To determine
Calculate the horizontal deflection and vertical deflection at joint B.
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Estimate the required air flow rate for the new activated sludge plant at Pea Ridge (Problems
23-223-723-10, and 23-13). The flow rate is 8,450 m³/day, the concentration
of bCOD going into the system (So) is 137 mg/L, the concentration of bCOD leaving the
system (S) is 16.3 mg/L, and the mass of cells produced per day (Pxvss) is 277.4 kg/d. Use the
following assumptions to estimate the required air flow rate:
. Clean water correction, a = 0.50
. Salinity correction, B = 0.95
Fouling factor = 0.9
Wastewater temperature = 12°C
Atmospheric pressure = 101.325 kPa
.Elevation 500 m
.
Depth of aerator = 5.6 m
Operating DO 2.0 mg/L
Percent oxygen leaving aeration tank - 19%
■ Manufacturer's SOTR = 535 kg/d
Manufacturer's air flow rate at standard conditions 50 m³/d - aerator
Express your answer with the units of m³/d and round to the nearest integer.
Determine the required solids retention time (SRT) of a completely mixed
activated sludge aeration tank for a conventional activated sludge system
treating a design flow rate of 34,560 m³/d, where the effluent standards are
30.0 mg/L for BODs and 30.0 mg/L for total suspended solids (TSS). Assume
that the BOD5 of the effluent TSS is 70% of the TSS concentration. Assume the
BODs concentration leaving the primary clarifier is 128 mg/L that the MLVSS
concentration (X₂) is 2,500 mg/L. Assume the following values for the growth
constants:
Ks 100 mg/L BODS
⚫ Hm - 2.5 d 1
kd = 0.050 d 1
Y = 0.50 mg VSS/mg BODs removed
Express your answer in days and round to the nearest 0.1.
Q1: Figure below shows loaded beam with its cross-section area, (A) Draw shear force and
bending moment diagrams, stating the main values, (B) Find central slope and deflection, (C)
Sketch the distribution of shear stress at left support, (D) Find maximum tensile and compressive
bending stresses set up in beam at right support. E-205GN/m²
P1
P2
P3
W1
W2
Lin Lin
#
A
Length in (m) and loads in kN
3a
a
2a
2a
(Cross-section area, All dimensions in (mm))
Chapter 7 Solutions
Structural Analysis, SI Edition
Ch. 7 - Prob. 1PCh. 7 - Prob. 2PCh. 7 - Prob. 3PCh. 7 - Prob. 4PCh. 7 - Prob. 5PCh. 7 - Prob. 6PCh. 7 - Prob. 7PCh. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - Prob. 10P
Ch. 7 - Prob. 11PCh. 7 - Prob. 12PCh. 7 - Prob. 13PCh. 7 - Prob. 14PCh. 7 - Prob. 15PCh. 7 - Prob. 16PCh. 7 - Prob. 17PCh. 7 - Prob. 18PCh. 7 - Prob. 19PCh. 7 - Prob. 20PCh. 7 - Prob. 21PCh. 7 - Prob. 22PCh. 7 - Prob. 23PCh. 7 - Prob. 24PCh. 7 - Prob. 25PCh. 7 - Prob. 26PCh. 7 - Prob. 27PCh. 7 - Prob. 28PCh. 7 - Prob. 29PCh. 7 - Prob. 30PCh. 7 - Prob. 31PCh. 7 - Prob. 32PCh. 7 - Prob. 33PCh. 7 - Prob. 34PCh. 7 - Prob. 35PCh. 7 - Prob. 36PCh. 7 - Prob. 37PCh. 7 - Prob. 38PCh. 7 - Prob. 39PCh. 7 - Prob. 40PCh. 7 - Prob. 41PCh. 7 - Prob. 42PCh. 7 - Prob. 43PCh. 7 - Prob. 44PCh. 7 - Prob. 45PCh. 7 - Prob. 46PCh. 7 - Prob. 47PCh. 7 - Prob. 48PCh. 7 - Prob. 49PCh. 7 - Prob. 50PCh. 7 - Prob. 51PCh. 7 - Prob. 52PCh. 7 - Prob. 53PCh. 7 - Prob. 54PCh. 7 - Prob. 55PCh. 7 - Prob. 56PCh. 7 - Prob. 57PCh. 7 - Prob. 58PCh. 7 - Prob. 59PCh. 7 - Prob. 60PCh. 7 - Prob. 61PCh. 7 - Prob. 62PCh. 7 - Prob. 63PCh. 7 - Prob. 64PCh. 7 - Prob. 65PCh. 7 - Prob. 66PCh. 7 - Prob. 67PCh. 7 - Prob. 68PCh. 7 - Prob. 69P
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