Page 163 - Materials Chemistry, Second Edition

146 Practical Design Calculations for Groundwater and Soil Remediation

Use Equation (4.20) to find the effluent concentration from each
reactor:

1
C 1
Reactor 1: =
+
1,800 1(0.1)(50)
C = 300 mg/kg
1
1
C 1
Reactor 2: =
1,800 1(0.1)(150)
+
C = 112.5 mg/kg
2
Use Equation (4.31) to find the concentration of the combined
effluent:

2(300)2(112.5)+
C f = = 206 mg/kg
22+

C = 206 mg/kg for both reactors (The combined final effluent
out
exceeds the cleanup level.)
(d) The residence time of the first reactor = 1 m /(0.01 m /min)
3
3
= 100 min
The residence time of the second reactor
= 1 m /(0.04 m /min) = 100 min
3
3
Q/4, C 0 Q/4, C 1
1 m 3
Q, C 0 Q, C f
3Q/4, C 0 3Q/4, C 2
3 m 3

Use Equation (4.20) to find the effluent concentration from each
reactor:

C out C out 1
= =
+
C in 1,800 1(0.1)(100)
C = 164 mg/kg for both reactors (The combined final effluent
out
exceeds the cleanup level.)