Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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Question
Chapter 9, Problem 19P
To determine
Find the absolute maximum shear in a 60 ft long simply supported beam.
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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
BOD/g VSS d in the aeration tank. In an effort to keep the waste activated sludge low in water, only
about 0.1% of the primary effluent flow (Q) exits the WAS line. The secondary effluent has a flow rate of
9990 m³/d.
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.
What is the concentration of vinyl chloride gas (in ppmv) in the same room 6 hours after all the
machines are turned off at the end of the day?
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)?
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