Indigenous micro-organisms naturally break down the organic contaminants found in LNAPLs and DNAPLs through a process sometimes known as bio-remediation. Bio-remediation systems take advantage of this process by encouraging micro-organism behavior through the injection of specially-selected gases and fluids.
Typically, the micro-organisms capable of degrading the components of LNAPLs thrive in aerobic (oxygen-rich) environments. Consequently, bio-remediation systems targeting LNAPLs will slowly inject air or pure oxygen into the contaminated zone to encourage the natural processes.
Some micro-organisms, including those capable of breaking-down DNAPLs, require anaerobic (oxygen-deficient) conditions. Bio-remediation systems can inject a variety of fluids to achieve these conditions, including molasses and vegetable oil.
Considerations in the design of bio-remediation system include the contaminant of concern, the required fluid or gas flow rate, and the number of injection wells.
Please follow the links to view the various types of equipment used in bio-remediation systems.
