Smart Evaporator

Carrier Gas Extraction (CGE™) - The Elegant Alternative to Conventional Evaporation

Say good-bye to traditional evaporators.


Our patented humidification / dehumidification technology mimics the hydrologic cycle to produce freshwater at costs up to 50% lower than traditional evaporators. The system’s smart controls make operation simple, even for variable feed conditions.


The Technology

Our award-winning evaporator alternative, the Carrier Gas Extraction (CGE) system,  is a low temperature, ambient pressure solution to achieve high recovery desalination of industrial wastewater to create fresh water.


The technology employs a humidification/ dehumidification process that uses a carrier gas to extract fresh water from high total dissolved solids (TDS) waste waters. Water is separated from the dissolved impurities by humidifying the carrier gas. Purified water is recovered in a subsequent dehumidification process, using a unique multi-stage bubble column heat and mass exchanger.


What is the gas? Typical applications use ambient air, while some may use nitrogen or helium.


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

image of Carrier Gas Extraction

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