What is natural attenuation?
Natural attenuation relies on natural processes to decrease or “attenuate” concentrations of contaminants in soil and groundwater. The entire process is called “monitored natural attenuation” or “MNA.” Natural attenuation occurs at most contaminated sites.
What is monitored natural attenuation?
Monitored natural attenuation (MNA) is an in situ remediation technology that relies on naturally occurring and demonstrable processes in soil and groundwater which reduce the mass and concentration of the contaminants.
What is engineered bioremediation?
Engineered bioremediation: A type of remediation that increases the growth and degradative activity of microorganisms by using engineered systems that supply nutrients, electron acceptors, and/or other growth-stimulating materials.
What are MNA parameters?
Monitored natural attenuation (MNA) can be an effective and low-cost approach for remediation of contaminated sites. MNA includes physical, chemical and biological processes that reduce contaminant mass or concentration in soil or groundwater under intrinsic condtions.
What is the difference between Biosparging and Bioventing?
Bioventing is the aeration of the unsaturated vadose zone to stimulate aerobic biodegradation. Biosparging is the injection of air into the groundwater to provide oxygen for groundwater remediation.
What are 2 different types of bioremediation?
What are the Different Types of Bioremediation?
- Microbial bioremediation uses microorganisms to break down contaminants by using them as a food source.
- Phytoremediation uses plants to bind, extract, and clean up pollutants such as pesticides, petroleum hydrocarbons, metals, and chlorinated solvents.
What is MNA process?
Where is bioventing used?
Bioventing is most often used at sites with mid-weight petroleum products (i.e., diesel fuel and jet fuel), because lighter products (i.e., gasoline) tend to volatilize readily and can be removed more rapidly using SVE.
What is the role of Biosparging in bioremediation?
Biosparging is an in-situ remediation technology that uses indigenous microorganisms to biodegrade organic constituents in the saturated zone. In biosparging, air (or oxygen) and nutrients (if needed) are injected into the saturated zone to increase the biological activity of the indigenous microorganisms.
