Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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Chapter 10, Problem 17P
To determine
Find the force in each member of the truss using structural symmetry.
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You are an engineer designing an aeration tank for a wastewater treatment plant receiving municipal
waste. The activated sludge system (aeration tank and secondary clarifier) you design needs to remove
85% of the incoming BODs from the primary effluent, giving a final concentration of 30.0 mg BODs/L
exiting the system. Your design will maintain a concentration of 2500 mg VSS/L and F/M ratio of 0.5 g
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What volume (in m³) will the aeration tank need to be?
Write out all equations and state any assumptions as needed.
Primary
effluent:
Q. Xo, So
Aeration tank
V, X, S
Secondary
Secondary
clarifier
effluent:
Qe, X, S
O
RAS line: Q, X., S
Activated sludge control volume
WAS line:
Qwx, S
b)
Workers in a 1000 m³ processing room in a plastics factory are exposed to vinyl chloride (C2H3CI) gas,
which is emitted when the plastic pellets are heated to make the final products.
a)
If the air change rate in the room is 0.21/h and the source strength of C2H3Cl is 68 mg/h, what is
the steady state concentration of C2H3Cl (in mg/m³ and in ppmv) in the room at 25°C and 1 atm?
Assume that C2H3Cl is conservative and that the concentration of the gas in the ambient air is zero.
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1) The reaction for the coagulation of water with alum is shown below.
a. Balance the equation.
Al2(SO4)3.18H2O +
Aluminum
sulfate (alum)
HCO3- ←→ __AI(OH)3 +
CO₂+
_H2O+
SO2-
Bicarbonate
precipitate
ion
b. If 125 mg/L of bicarbonate is in the water and the plant treats 432,000 L/d, how much aluminum
hydroxide precipitate will the treatment plant operator need, to dispose of daily (in kg/d)?
Chapter 10 Solutions
Structural Analysis
Ch. 10 - Prob. 1PCh. 10 - Prob. 2PCh. 10 - Prob. 3PCh. 10 - Prob. 4PCh. 10 - Prob. 5PCh. 10 - Prob. 6PCh. 10 - Prob. 7PCh. 10 - Prob. 8PCh. 10 - Prob. 9PCh. 10 - Prob. 10P
Ch. 10 - Prob. 11PCh. 10 - Prob. 12PCh. 10 - Prob. 13PCh. 10 - Prob. 14PCh. 10 - Prob. 15PCh. 10 - Prob. 16PCh. 10 - Prob. 17PCh. 10 - Prob. 18PCh. 10 - Prob. 19PCh. 10 - Prob. 20PCh. 10 - Prob. 21PCh. 10 - Prob. 22PCh. 10 - Prob. 23PCh. 10 - Prob. 24PCh. 10 - Prob. 25PCh. 10 - Prob. 26PCh. 10 - Prob. 27PCh. 10 - Prob. 28PCh. 10 - Prob. 29PCh. 10 - Prob. 30P
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