Model GPRO - Low Pressure - Gas Diffusion System

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The gPRO Gas Diffusion System from Inventures Technologies employs the same technology and the ISOC . The system can be deployed in a number of application including: Active in situ bio and optimization of ETR systems. Oxygen for aerobic treatment. Oxygen and cometabolic substrates (alkane and alkene gases) for lower chlorinated compounds, 1,4-dioxane, NDMA. Hydrogen for reductive dechlorination of chlorinated solvents, denitrification and perchlorate reduction. Abiotic Geochemical Fixation of metals. pH adjustment with CO2. NAPL recovery enhancement with CO2 Saturated Water Injection (SWI).

  • More efficient mass transfer for cost effective bioremediation.
  • Higher dissolved gas levels at ambient pressure.
  • Reduced or virtually eliminated gas losses.
  • Lower power consumption.
  • Easily controlled.
  • Lower installation costs.
  • Use of 2-inch or larger diameter infusion wells.
  • Ability to move small, mobile gas in Fusion units

The gPRO LP system is totally unique in that the device is submerged in the body of water and directly infuses the dissolved gas. The fluid is pumped through an internal core of the gPRO LP fiber module and then passes over the large surface area of the gas-filled fibers.

The highly efficient mass transfer process dissolves large amounts of dissolved gas in the water. Typically for a gas such as oxygen, 25 to 100 mg/l of dissolved oxygen (DO), depending upon water retention time in a tank system or the depth of submersion of the gPRO unit in a well system and any backpressure induced by the well casings in which the gPRO LP can be placed. In essence, dissolved oxygen concentrations can be adjusted to suit site - specific conditions. Similarly, other gases such as hydrogen can be used depending upon the remediation required and the applicable site conditions.

The following remediation scenarios can be deployed with the gPRO LP system to dramatically enhance groundwater bioremediation. The system can be deployed for source remediation or as a plume cut off or remediation strategy or all of the foregoing dependent on the complexity of the bioremediation system design. The system can also be deployed as the bioremediation component in combination with other technologies.

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gPRO LP Tank System
The gPRO LP system can be used in an above ground tank to saturate water with a dissolved gas in batch or continuous operation. The gas-saturated water can then be introduced into the groundwater via injection wells at rates as prescribed by the remediation specialist.

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gPRO LP Single Screen In -Well System
The gPRO single screen in-well system deploys no packers. Operation creates very high dissolved gas concentration around the infusion well to be carried by advection and dispersion to the bioremediation zones.

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gPRO LP Dual Screen In –Well System (Deep to Shallow)
The gPRO is deployed in a dual screened well with a pump and packer. The pump is located above the packer and the gPRO bellow creating an upward circulation pattern around the well and an increased area of influence. Higher levels of gas concentrations can be achieved by partially closing the lower screened area thus creating increased pressure in the lower part of the well. The result is higher dissolved gas concentrations.

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gPRO LP Dual Horizontal Flow In -Well System
Utilizing two wells or a series or wells over a treatment zone, groundwater with enhanced levels of dissolved gases can be circulated within the zone. Strategic deployment of gPRO infusers with packers and riser shells can create a large treatment zone.

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gPRO LP Dual Screen In –Well System (Shallow to Deep)
The gPRO is deployed in a dual screened well with a pump, packer and riser shell. The pump and GPRO unit are located below the packer and the water flows upward through a riser shell creating a downward circulation pattern around the well and an increased area of influence. Higher levels of gas concentrations can be achieved by partially restricting the riser shell thus creating increased pressure in the lower part of the well. The result is higher dissolved gas concentrations.

gPRO LP In -Well Amended Groundwater Recharge System
The gPRO system is adding concentrated dissolved gas to the aquifer by supersaturating water from an outside source. The water can be from a potable supply or may be a re-injection well from a pump and treat system.

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Operations
The system performance is affected by five functions: water flow, pressure, inlet target gas content, other dissolved gases in the inlet water (e.g. nitrogen) and water temperature. The chart below is the oxygen performance chart for a 3-inch (75 mm) gPRO unit.

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