(Enhanced) natural attenuation, anaerobic

(Enhanced) natural attenuation, anaerobic

Description technique

The potential of naturally present bacteria to degradate the contamination in a (near) anoxic environment is stimulated by optimizing the conditions for degradation. In an anoxic environment degradation takes place mainly by reduction of the contamination. To stimulate this degradation process an electron donor is added to the soil. If there is a shortage of nutrients (nitrogen and phosphorus) they are also added. If the required bacteria are not in sufficient numbers present, they can also be added to the soil. In practice, stimulated degradation is mainly applied for the remediation of CVOC. Reductive dechlorination of CVOC occurs because specific bacteria break down organic matter (oxidation) and use the contamination as electron acceptor.

Applicability
Enhanced biological anaerobic degradation can be applied for volatile chlorinated hydrocarbons (CVOC), HCH, mono-and dichlorobenzene, TEX and some pesticides. The technique can be applied in the saturated zone where the contamination is degraded in the soil and / or groundwater. A poor to well permeable soil is required. The technique is applicable to both the source and plume. The addition of the necessary compounds is often combined with pump & treat.
Comments
The duration of this technique depends on the size and type of contamination ranging from years to decades. Disturbance of the site is low. Infiltration takes place through injection filters or "direct push".
Related cases and HIP-pilots
Related cases: , , , , , , , , , , , , , , , , , , , ,
2017-10-22T12:37:31+00:00