The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 19, 2006
Filed:
May. 10, 2005
Thomas D. Hayes, Schaumburg, IL (US);
Thomas D. Hayes, Schaumburg, IL (US);
Gas Technology Institute, Des Plaines, IL (US);
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.