Environmental Engineering Reference
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Fig. 19.6
Sequential degradation of toluene through different TEAPs: (
a
) temporal concentration
profiles of electron donor, electron acceptors, metabolic by-products and a conservative tracer; (
b
)
computed reaction rates of the different TEAPs determining a temporal redox zonation
model strictly following the energetic yield of the redox reactions allowing very lit-
tle overlapping between the different processes. The decreasing trend in the toluene
concentration results from biodegradation with the sequential utilization of the
different electron acceptors (Fig.
19.6a
). Dissolved oxygen and nitrate are con-
sumed first, followed by the solid species MnO
2
and Fe(OH)
3
producing dissolved
manganese and iron. Subsequently, sulfate starts to be depleted and finally methano-
genesis takes place. The sequential order of the TEAPs can be effectively visualized
by plotting the transient reaction rates of the different processes (Fig.
19.6b
).
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