Environmental Engineering Reference
In-Depth Information
Figure 15.16a.
Diagram of the in situ biodegradation process (unsaturated zone)
Figure 15.16b
Diagram of the in situ biodegradation process (saturated zone)
The most critical aspects in the system's design are the flow of subterranean
water. Indeed, subterranean water flow must be sufficient to provide the required
quantities of nutrients and oxygen in a reasonable time. Moreover, water flow
should entirely sweep the sector requiring treatment. In the case of the active
system, it is important that the wells can capture subterranean water to prevent
migration of the contaminants outside the treatment zone. In order to make sure that
adequate control of subterranean water is maintained, only part of the recovered
subterranean water is generally reinjected. The other part is discharged using an
acceptable method.
