Patent ID: 6503395
Filing Date: 2003-01-07
Classification: B09C,E21B,Y10S

Abstract:
A method for in situ remediation of an aquifer having a treatment zone through which passes water contaminated with at least one chemical contaminant which method comprises:a) delivering to the treatment zone a microbial culture capable of degrading at least one chemical contaminant present in said aquifer; and b) injecting, by at least two conduits, an oxygen-containing gas at a pressure of at least 5 psig above the hydrostatic pressure at injection points with injection frequency and volume at each injection point having the relationship according to the following equation: e[(âˆ’VÃ—FÃ—NÃ—H)/(WÃ—BÃ—Q)]>0.50 Wherein: e=natural exponential V=volume of gas injected at each injection point (ft3) F=frequency of injections (number of injections per day) N=number of gas injection points W=width of the treatment zone perpendicular to groundwater flow path (ft) B=vertical thickness of treatment zone (ft) Q=specific discharge of groundwater to the treatment zone (ft/day) H=Henry's Constant for contaminant of interest ((mg/L-water)/(mg/L-air)).