Natural Bioremediation

• Also known as natural attenuation, natural bioremediation is a method of ISB that uses microorganisms indigenous to the contaminated area to degrade the contaminant. This process is monitored to ensure the microbes naturally degrade the contamination and that procedures are in place to prevent the migration of the contaminants.
  
  

In Situ Biostimulation

• When conditions are not favorable for the growth of the bacteria being used to degrade contaminates, in situ biostimulation is implemented. The soil is manipulated through aeration to provide increased oxygen. Depending on the type of microorganism being used, nutrients may also be added to stimulate growth.
  
  

Bioaugmentation

• The process of bioaugmentation consists of the introduction of either a genetically altered microorganism or a foreign cultured species. Another form of bioaugmentation is performed by isolating an indigenous microbial consortium, infusing it with nutrients and then reintroducing it to the contaminated site.
  
  

Bioventing

• By inducing oxygen flow into the contaminated area, bioventing enhances microbial activity. Bioventing is done either through the delivery of oxygen by an electric blower to subsurface wells or through a natural air exchange.