Carrier Gas Extraction

Carrier Gas Extraction (CGE™) for Desalination and Brine Concentration: Transform the most difficult wastewater into the highest quality fresh water with Gradiant’s flagship desalination product

Our patented humidification and dehumidification (HDH) technology produces high-quality freshwater (500 ppm or less, if required) and highly concentrated brine solutions from high-TDS wastewater at costs lower than traditional alternatives.


The Technology

CGE is a low temperature, ambient pressure technology for high recovery desalination of industrial wastewater to create pure freshwater. The technology employs a humidification – dehumidification process that uses a carrier gas like air, nitrogen or helium to extract fresh water from high-TDS wastewaters. Water is separated from the dissolved impurities by humidifying the carrier gas, and purified water is recovered in a subsequent dehumidification process, using a unique multi-stage bubble column heat and mass exchanger.


Gradiant was awarded Global Water Intelligence’s “Technology Idol” in 2013 for this groundbreaking technology.

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Case Study

Texas Produced Water Treatment Plant for Fresh Water,
Clean Brine and Concentrated Brine.


Location: Texas, USA


Gradiant Technology: Carrier Gas Extraction (CGETM) & Selective Chemical Extraction (SCETM)


Customer: Independent Oil & Gas company with $20+B market capitalization based out of Texas, USA


Customer Requirement: Provide water requirement for field development according to the drilling and completions schedule in a safe, reliable and cost effective manner through a produced water treatment and re-use program (Design-build-own-operate-maintain)


Capacity: 12,000 BPD influent and delivering 2,000 BPD Fresh, 9,000 BPD Clean Brine, 1,000 BPD 10-lb Brine with the ratio varying with the changes in influent water

Treatment Requirement:

  • Clean Brine:De-oiling, Disinfection, Solids and Turbidity control, Hardness and Scaling Control, pH adjustment
  • Fresh Water:Total Dissolved Solids (TDS) Removal

Operational Metrics

  • Fresh Water Recovery @ 100k mg/L TDS > 60%, Fresh Water Recovery @ 150k mg/L TDS > 40%
  • Water quality statistically monitored to be within prescribed effluent limits at all times
  • Solid waste disposed at appropriate landfill
  • All effluent re-used within oil and gas operations
  • Utilized natural gas as energy source

Influent Fresh Water Heavy Brine Units
Total Suspended Solids 200 - 1,600 ND mg/l
Oil & Grease 40 - 200 ND mg/l
Calcium 2,000 - 4,000 <5 mg/l
pH 6 to 8 7 to 9 STD Units
Total Dissolved Solids 80,000 - 150,000 <50 >269,000 mg/l
Chloride 40,000 - 90,000 <25 mg/l
Sodium 30,000 - 45,000 <10 mg/l
Hardness as Calcium Ion 4,000 - 10,000 <10 mg/l

Download Full Case Study Here