CSTR CSTR Q Q PFR PFR
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:0.5Q
CSTR
CSTR
Q
Q
PFR
0.5Q
PFR
Figure 1 (a). Reactors in parallel
Figure 1 (b). Reactors in series

Transcribed Image Text:You are considering available options to meet new effluent quality standards for a particular
contamination being treated at your plant. Currently you are operating with two reactors connected in
parallel as shown in Figure 1(a). One reactor is a plug flow reactor (PFR), the other is a completely
stirred tank reactor (CSTR). The following information is available:
Design flow, Q:
60 L/min
Influent concentration, Co:
10 mg/L
Order of reaction:
1st Order
Decay constant, k:
0.25 min!
Volume of PFR, Vp:
360 L
Volume of CSTR, Vc:
2280 L
Using the above information, determine:
a. The residence time, t, in each reactor;
b. The effluent concentration from the PFR;
C.
The effluent concentration from the CSTR.
d. The resulting effluent quality with the two reactors in parallel.
You want to investigate whether operating these reactors in series will allow the required effluent
standard of 0.25 mg/L to be met. You are therefore proposing the new configuration for the reactors
shown in Figure 1(b)
Determine whether the plant will be able to meet the effluent standards.
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