Entreprise réalisant: Bioremédiation: bioaugmentation sur site

Type d'installation: Entreprise fictive

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Description:

Stimulating bioremediation by addition of micro organisms (e.g., fungi, bacteria, and other microbes) and/ or nutrients (e.g. oxygen, nitrates) to the subsurface environment to accelerate the natural biodegradation process by the naturally occurring microorganisms of the soil. Bioremediation can take place under aerobic or anaerobic conditions.

There are four major processes, briefly described below.

Bio-Stimulation:

· Gaseous Nutrient Injection In this case, nutrients are fed to contaminated groundwater and soil via wells to encourage and feed naturally occurring microorganisms.

· Oxygen Enhancement with Hydrogen Peroxide as an alternative to pumping oxygen gas into groundwater.

· Nitrate Enhancement A solution of nitrate is sometimes added to the groundwater to enhance anaerobic biodegradation.

Bio-augmentation Sometimes acclimated microorganisms are added to the soil to increase biological activity. However, the efficiency of this technique is not as well proven as the bio-stimulation.

The first three methods are preferred because they stimulate the naturally occurring indigenous micro-organisms, already adapted to the environment.

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