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Problem 3: Livestock facilities produce unpleasant odors, including those due to ammonia
and hydrogen sulfide. Due to neighborhood complaints, a livestock manager is now required
to decrease the concentration of ammonia discharged to the air to 1000 ug/m'. She wants to
remove ammonia (NH3) from two air waste streams by adsorption and reaction in a well-
mixed reactor (volume = 2m').
Homework 4 (assigned September 29, 2019)
N. B. Saleh
Due Friday, October 04, 2019
Consider the following treatment system, where T-30 C and P=1 atm.
C1= 5 ppmv
Q1 = 0.009 m'/min
Adsorption: 20 ug NH,/min
Reaction: 1x10# mg NH3/(m's)
Cout- ? ug/m'
Qout = ? m'/min
Reactor Volume=2m'
C2=3000 ug/m'
Q2 = 0.001 m'/min
a. Circle the control volume that you will use to write mass balances on air and NH3.
b. Write the steady state mass balance for air. What is Qout (m'/min)?
c. Write the non-steady state mass balance for NH3. When will the air leaving the reactor
be in compliance with the local ammonia regulation (1000 ug/m')? Assume that the
initial concentration of ammonia in the reactor is 3000 ug/m'. Express the time in

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