Patent ID: 7704389

Claim:
An apparatus for in situ groundwater decontamination within a subsurface region of earth comprising: a first conduit for passing a liquid feed stream therethrough; a second conduit; a gas port for injecting a treatment gas into at least one member of the group consisting of the first conduit and a second conduit; an orifice restriction located at a lower end of the first conduit for vertically discharging the liquid feed stream downwardly from the first conduit through the orifice restriction into the second conduit to form a confined plunging liquid jet gas and liquid contact zone in a vertically oriented upstream end portion of the second conduit to dissolve at least a portion of the treatment gas into the liquid feed stream in the contact zone to form an enhanced gas concentration liquid stream; and the second conduit in direct or indirect fluid communication with the subsurface region of earth, and wherein the first conduit is closed between the first conduit upstream end and contact zone except at the gas inlet port.