Many of our remediation projects are going through a biological phase, in which the core is removed and the remaining contamination in the plume is broken down in a biological manner. Depending on the nature and the seriousness of the residual contamination, the decomposition is stimulated by injecting oxygen and/or carbon sources together with nutrients. We stimulate both anaerobic and aerobic decomposition processes.
We do our own planning and monitoring for the decomposition processes. In some cases, the products are broken down in a natural way, leaving us with not much else but monitoring the decomposition process.
We are using the following techniques:
- Bio venting the unsaturated zone.
- Air sparging the saturated zone.
- Shock load injections (one-off injections of nutrients).
- Continuous injections via extraction and infiltration of groundwater with nutrients.
Biological techniques can be a suitable and affordable alternative, especially in plume areas or as a biological barrier.