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Both industries and municipalities are facing a combination of major environmental, regulatory, social, economic and operational challenges. As a result, they have begun to look beyond simple service solutions in search of a truly creative partner able to innovate. This is the kind of ongoing challenge at which Veolia excels.

Zero liquid discharge at the world’s largest gas-to-liquid plant

Veolia has developed a unique process for recycling water generated during the gas-to-liquid transition so it can be fully reused on site.

Shell Qatar



The Pearl Gas-to-Liquid (GTL) complex in Ras Laffan, Qatar, is the largest plant of its kind in the world. Each day it produces 140,000 barrels of oil equivalent, of which 120,000 barrels are converted into liquefied natural gas and ethane. Shell and its partner, Qatar Petroleum, were looking to operate a model facility that would have zero liquid discharge as part of a closed-loop system.


As part of a joint venture that included Italy’s Saipem and the Qatari firm Al Jaber, Veolia was selected to design and build an effluent treatment facility that uses a biological process, followed by ultrafiltration, reverse osmosis and evaporation/crystallization, to treat 45,000 cubic meters of water a day. The water is then reused in the plant’s production process; no liquid effluent is discharged into the environment.

Thierry Froment

Thierry Froment
Executive Vice President - Oil & Gas, Veolia Water Solutions & Technologies


“Veolia is the only company in the world with the in-house technology to provide a guarantee of ‘Zero Liquid Discharge’ at a facility of this size.”

Map Qatar

100% of water is treated and reused on site

Smaller environmental footprint

Customer benefits

  • Strict regulatory compliance
  • Smaller environmental footprint
  • Greater community acceptance 


  • “Zero liquid discharge” effluent treatment and recycling: engineering-design and construction