Patent ID: 7252986
Filing Date: 2007-08-07
Classification: B09C

Abstract:
1. A process for biodegradation of hazardous hydrocarbon and/or ether wastes present in subsurface soil, said process comprising: admixing a proppant, sodium percarbonate coated with polyvinylidine chloride, and water to form a slurry; injecting the slurry into the subsurface soil at a hydraulic pressure sufficient to form fractures in the subsurface soil, the proppant serving to hold open the fractures; and establishing colonies of bacteria within the fractures, the bacteria having the capability of digesting and degrading the contaminants and the encapsulated sodium percarbonate serving as a solid oxygen source for supplying oxygen to the bacteria; and injecting additional oxygen and/or solid oxygen source into the subsurface soil with an interval of at least ten months between injections.