Hydraulic and earth engineering – Soil remediation – With treatment
Reexamination Certificate
2006-09-19
2006-09-19
Kreck, John (Department: 3673)
Hydraulic and earth engineering
Soil remediation
With treatment
C405S128500, C435S262500, C210S747300
Reexamination Certificate
active
07108455
ABSTRACT:
A method for removing volatile and semi-volatile contaminants from groundwater in which the contaminants are stripped from the groundwater by sparging with an inert carrier gas and the stripped contaminants are transported into a bioactive zone into which at least one gaseous oxidant and at least one nutrient are independently injected, thereby stimulating at least one microbial culture associated with the bioactive zone to remove the stripped contaminants from the bioactive zone. By decoupling the sparging of the groundwater from the introduction of oxidants and nutrient feed gases into the bioventing bioactive zone of the subsurface, the oxygen and nutrient inputs to the bioactive zone can be adjusted (or carbureted) and controlled independently from the hydrocarbon input to the bioactive zone to achieve good kinetic performance in the bioactive zone while avoiding the problems of plugging of groundwater sparging due to biofilm and precipitate formation.
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Fejer Mark E.
Gas Technology Institute
Kreck John
LandOfFree
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