Cornelsen Umwelttechnologie GmbH

Model GPRO - High Pressure - Gas Diffusion System

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The groundwater Pressurized Remediation Optimizer (gPRO) High Pressure (HP) system, based on inVentures patented Gas inFusion technology, inFuses higher stabilized concentrations of dissolved gas into water compared to any other technology. For superb bioremediation results, inFusion is accomplished without additives such as hydrogen peroxide, ozone or other agents with potentially harmful side effects.

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The gPRO HP is a simple to use, low energy, low maintenance bioremediation system that will treat a multitude of contaminants aerobically or anaerobically (depending upon the gas infused):

Aerobic

  • Hydrocarbons (Oxygen)
  • MTBE (Oxygen)
  • CAH (VC) (Oxygen)
  • CAH (TCE, DCE) (Oxygen and Alkane Gas)
  • 1,4 Dioxane (Oxygen andAlkane Gas)
  • Ammonia (Oxygen)

Anaerobic

  • CAH (Hydrogen)
  • Nitrate (Hydrogen)
  • Perchlorate (Hydrogen)
  • Chrome 6 (Hydrogen or Hydrogen Sulfide)

gPRO HP can also be utilized with carbon dioxide or ammonia for pH adjustment

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  • Lower power consumption and installation costs;
  • Use of 1/2 inch or larger diameter wells
  • Inject treated discharge water or freshwater
  • Simple controls
  • Infuses ANY miscible gas into water
  • Drastically reduces Pump and Treat times
  • Higher dissolved gas levels at ambient pressure
  • Increased biological degradation rates
  • No gas loss or off gassing or risk of vapour intrusion
  • No preferential pathways
  • No gas entrapment leading to mounding
  • Automatic controls shut down and start up the
  • System when necessary
  • An oxygen generator (for oxygen applications)
  • can be integrated, in place of oxygen cylinders

The gPRO HP comprises both production and delivery processes:

The gPRO HP production process entails delivering gas through the hollow fibres into pressurised water flowing past the fibres modules. Mass transfer occurs transferring gas into the high pressured water. For a gas such as oxygen 25-150 mg/l of dissolved oxygen can be produced. Dissolved gas concentrations can be adjusted to suit to suit specific conditions. Typically the process is used to infuse gas into abstracted and treated groundwater.

The gPRO HP then delivers the gas infused water via a distribution header back to groundwater. Pressure is regulated in order to ensure that the dissolved gas does not come out of solution prior to re-injection. The gPRO HP is best suited to enhance existing groundwater pump and treat systems coupled with groundwater re-injection.

For the past two years systems similar to the gPRO HP system have been successfully used in several other market applications including aquaculture, hydroponics and industrial processes. inVentures has tested and continues testing gPRO HP systems in groundwater remediation applications.

The gPRO HP system is made up of two essential parts: gPRO production, and gPRO delivery. In the production, the delivered gas fills the microporous hollow fiber inside the gPRO infusers, while the pressurized water flows past this fiber. The highly efficient mass transfer process dissolves large amounts of dissolved gas in the water under pressure. Typically for a gas such as oxygen, 25 to 250 mg/l of dissolved oxygen (DO) would be produced depending on pressure and flow conditions desired for specific applications. The DO levels can be adjusted to suit site – specific conditions. Similarly, other gases can be used depending upon the remediation required and the applicable site conditions.

The gPRO HP system delivery for groundwater water enhancement applications involves the deployment of the gPRO distribution header and any number of lines to groundwater infusion wells. The pressure of the system is regulated to insure that essentially all of the dissolved gas maintained in a virtually bubble-less condition at ambient pressure. It is important that gases do not evolve and block flow pathways within the saturated soil.

This unique, patented production and delivery process creates a supersaturated stream containing hundreds of mg/l (ppm) of dissolved gas, depending on flow conditions. This dissolved gas is not lost to atmosphere like conventional processes, but remains in solution significantly longer for biological consumption. No other technology or process in the world can equal this.

The gPRO HP system is elegant in its simplicity with automatic controls Tied to water and gas supply. If gas or water is interrupted, the system shuts down and waits for pressure to be re-established. When normal operation resumes, the system returns full automatic operation. For oxygen applications, an oxygen generator and pressure booster can be integrated with the gPRO, which eliminates the requirement for oxygen cylinders. Not needing gas cylinders eliminates the needs for accessing the site, transporting and handling the cylinders and changing them out. The oxygen is extracted from the ambient air using a pressure swing adsorption technology to generate oxygen at 95% purity. An oxygen compressor then compresses the generated oxygen and stores it in a compression tank at 90 psi (620 kPa) to be used as the gas supply to the gPRO HP modules. For other gas applications, cylinders will generally be required.

The small size of the gPRO HP system equipment allows a trailer or truck-mounted setup to be used to move from one set of injection points to another on the same site. For permanent setups, the unit can be housed in a small shed or in a ground vault similar to those used for transformers. A unit capable of oxygenating 40 USGPM (150 lpm) and transferring approximately 20 pounds of oxygen per day (8.8 x 106 mg) into the groundwater will have an oxygen concentration of approximately 45 mg/l depending upon the initial concentration of inlet water. This would cause no concern with respect to off gassing in the subsurface saturated zone. A gPRO HP system with an integrated oxygen generator and pump weighs about 500 lbs (225 kg) and has a footprint of 2 feet (60 cm) by 4 feet (120 cm).

The system performance is affected by five functions: water flow, pressure, inlet oxygen content, dissolved gases in the inlet water (e.g. nitrogen) and water temperature. Interestingly, as the temperature rises, the solubility of oxygen in water goes down. However, simultaneous with a temperature increase is a substantial increase in the oxygen diffusion coefficient. A gPRO HP system can actually transfer approximately 25% more gas at 30 degrees C (86 degrees F) than 10 degrees C (50 degrees F).

  • DO1 = Dissolved oxygen content in the influent fluid
  • DO2 = Dissolved oxygen content in the exiting fluid
  • DO3 = Dissolved oxygen within the system
  • P1 = pressure of the incoming fluid
  • P2 = pressure of the fluid leaving system
  • P1 - P2 = System head losses

  • Length: 48” (120 cm)
  • Width: 24” (60 cm)
  • Height: 48” (120 cm)
  • Weight: 500 lb. (225kg)
  • Pump: Model dependent
  • Water: 54 F (12 C)
  • Power: 230 V - 5.1 amps
  • Phase: Single
  • Housing Requirements for indoors use. Air quality should be clean and dry, naturally ventilated. Nitrogen from the oxygen generator exhausted outside to prevent nitrogen build up.
  • Weight includes an oxygen generator and pump. Without the generator and pump the gPRO HP 8 weighs 125 lb (55 kg).

The gPRO HP system is primarily used with some form of hydraulic control. The unit will infuse various gases to promote high bioremediation activities. The system can cut pump and treat times by a factor of 5. In some cases, the gPRO HP can be used without hydraulic control where some plume migration is not detrimental.

The gPRO HP system is primarily used with some form of hydraulic control. The unit will infuse various gases to promote high bioremediation activities. The system can cut pump and treat times by a factor of 5. In some cases, the gPRO HP can be used without hydraulic control where some plume migration is not detrimental.

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