Environmental Engineering Reference
In-Depth Information
Input from
surface
Air-water
exchange
Wet and dry
deposition
Outflow
Air
Chemical/bio/photo reactions
Particle
transport
Sorption
Vertical &
Horizontal
mixing
Resuspension
Water
Sediment-water
exchange
Sedimentation
Sediment
FIGURE 6.14
Schematic of various fate and transport processes for a pollutant entering a
lake.
Q
0
C
A
(Atmosphere)
Q
0
C
A0
Reaction
Photolysis
Bioreactions
Mixing
Epilimnion
Hypolimnion
Sedimentation
(Sediment)
FIGURE 6.15
A CSTR one-box model for the epilimnion of a lake.
that the overall rates will be composed of the several first-order processes listed in
Figure 6.15.
r
tot
=
(k
voln
+
k
sed
+
k
rxn
+
k
photo
+
k
bio
)C
A
=
k
tot
C
A
.
(6.72)
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