iSOC Passive Gas inFusion System

iSOC®, in situ Submerged Oxygen Curtain, is an oxygen delivery technology that when suspended in existing monitoring wells infuses high levels of oxygen into groundwater. The proprietary structured polymer used in iSOC® contains hydrophobic microporous hollow fiber. These fibers provide approximately 7,000 square feet of interface area per cubic feet of fiber for the mass transfer of oxygen into groundwater.

iSOC Passive Gas inFusion System

Most conventional technologies, however, waste most of their oxygen because the bubbles rise to the top of the groundwater table and escape before they have a chance to dissolve or to be utilized by naturally occurring hydrocarbon degraders.


Features and Benefits


  • Delivers 40-200 PPM DO depending on groundwater characteristics and iSOC® depth;
  • Uses existing 2-inch monitoring wells for installation;
  • Connects to standard oxygen cylinder;
  • No power, off-gases, pumps, hazardous by-products, or permit; and
  • Small, simple, efficient, predictable, easy to use, and very low maintenance.


  • Use to treat source, polish off sites or to stop off-site migration;
  • Will infuse any gas (oxygen, propane, methane, hydrogen and ethane); and
  • Can be used for cometabolic treatment (with alkane gases).


  • No moving parts and no electricity; and
  • Easily moved to a new injection point or new site.


  • Annual cost of oxygen for 3- iSOC®s is less than $250.00 a year;
  • Lowest annual O & M of any competitive technology;
  • True pay-for-performance technology for cleaning up sites; and
  • Installs in a few hours and is extremely easy to use.
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iSOC®, which stands for in situ Submerged Oxygen Curtain technology, is a groundwater bioremediation delivery system for introducing supersaturated oxygen or other gaseous substrates into groundwater.

Developed by inVentures Technologies, the patented Gas infusion technology contains over 700 hydrophobic microporous hollow fibers that supersaturate the groundwater with low decay DO. Made of stainless steel (1.62 inches/ 41mm in diameter and 12.5 inches/ 318 mm in length) the iSOC® probe is placed in a series of monitoring or treatment wells to create a curtain of high concentration dissolved gas.
The iSOC® unit transfers gases directly to groundwater in a treatment well without sparging. Each unit is connected to a source of pressurized oxygen or other substrate gases with polyurethane tubing and gas delivery is managed with a control panel that includes a gas flow meter and pressure gauges. The top of the iSOC® unit is equipped with a barbed fitting to accommodate 0.17" or 4 mm ID inch diameter polyurethane tubing and a filter system that accommodates the corresponding tubing OD of either 0.25' or 6 mm. A lifting eye is also installed on the top of the unit for attaching a lifting/security wire for placement in the well.

iSOC® is a low cost technology for supersaturating the ground water to enhance natural attenuation. The technology supersaturates the ground water with low decay D.O. At concentrations ranging from 40 to 200 ppm depending on aquifer conditions and depth of injection. The technology has no moving parts and does not require electricity. The technology can be easily moved to a new injection point or new site.

The iSOC® can achieve a radius of influence of 15 – 20 feet (4.6 – 6.1 m) or greater around a treatment well. The unit is typically installed up gradient of the source or monitoring well. Although the technology is primarily dependent on ground water velocity and the oxygen demands of the aquifer, molecular dispersion will also play a key role in tight soils.

The unit will work in a 2-inch (51mm) monitoring well or larger and the oxygen transfer efficiency is nearly a 100%. Polyurethane tubing is used to connect the iSOC® unit to the filter and oxygen canister. The internal flow controller on the iSOC® is set at 16 cc/min and will automatically compensate for various depths of water. One iSOC® unit will use 1 cubic feet (28 liters) of oxygen per day. A typical 1,5 m3 cylinder will last approximately 53-54 days.

The iSOC® technology is installed at hundreds of petroleum and chlorinated solvent sites in the USA, Canada, Europe and Asia. The technology can be used as a primary remediation strategy, for polishing or for control of off-site migration.


Major Applications

  • Hydrocarbons
  • Vinyl Chloride
  • Ammonia
  • 1,4-Dioxane

Groundwater Remediation Applications

ContaminantGasElectron DonorCarbon SourceProcess
Hydrocarbons O2 Contaminant Contaminant Aerobic
Hydrocarbons O2 + Alkane Alkane + Contaminant Alkane + Contaminant Aerobic
MTBE O2 Contaminant Contaminant Aerobic
MTBE O2 + Alkane Alkane + Contaminant Alkane + Contaminant Aerobic
CAH H2 H2 In situ Organic Anaerobic
CAH H2 H2 + Organic Added Organic Anaerobic
CAH Alkane Alkane Alkane Anaerobic
CAH O2 + Alkane Alkane Alkane Aerobic
CAH O2 Alkane In situ Organic (natural Methane) Aerobic
CAH (Vinyl Chloride) O2 Contaminant Contaminant Aerobic
CAH (Vinyl Chloride) O2 + Alkane Ethene + Contaminant Ethene + Contaminant Aerobic
Ammonia O2 Ammonia In situ organic or CO2 Nitrification
Nitrate H2 +/- CO2 H2 In situ organic or CO2 Denitrifcation
Perchlorate H2 +/- CO2 H2 organic or CO2 In situ organic or CO2 Dissimilatory Reduction (Anaerob)
1,4-Dioxane O2 + Propane Propane In situ or Added Organics Aerobic

CAH - Chlorinated Aliphatic Hydrocarbons
MTBE - Methyl Tertiary Butyl Ether