0.5QCSTRCSTRQQPFR0.5QPFRFigure 1 (a). Reactors in parallelFigure 1 (b). Reactors in series You are considering available options to meet new effluent quality standards for a particularcontamination being treated at your plant. Currently you are operating with two reactors connected inparallel as shown in Figure 1(a). One reactor is a plug flow reactor (PFR), the other is a completelystirred tank reactor (CSTR). The following information is available:Design flow, Q:60 L/minInfluent concentration, Co:10 mg/LOrder of reaction:1st OrderDecay constant, k:0.25 min!Volume of PFR, Vp:360 LVolume of CSTR, Vc:2280 LUsing 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 effluentstandard of 0.25 mg/L to be met. You are therefore proposing the new configuration for the reactorsshown in Figure 1(b)Determine whether the plant will be able to meet the effluent standards.

Answered: Image /qna-images/answer/1fb98b4d-0787-45a3-a06a-971405f69f93.jpg

Answered: CSTR CSTR Q Q PFR PFR

Engineering

Civil Engineering

CSTR CSTR Q Q PFR PFR

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Pressure and Stress

Question

0.5Q
CSTR
CSTR
Q
Q
PFR
0.5Q
PFR
Figure 1 (a). Reactors in parallel
Figure 1 (b). Reactors in series

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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