Eco-friendly water treatment solution for the Fos-Cavaou LNG carrier terminal

Reducing the environmental impact of the Fos-Cavaou LNG terminal with a biodegradable, biobased water treatment process

The processes used to liquefy and regasify methane use a lot of water, which then has to be treated before being released back into the environment. Elengy has developed a bio-based and biodegradable solution for this treatment. It commissioned Artelia to design and build an “injection skid” to diffuse this marine biopolymer in the water treatment system at the Fos-Cavaou terminal. This solution is a world first, and set to be rolled out at other LNG carrier terminals.


Implemented by Elengy in partnership with Polymaris and ENGIE Lab Crigen, this new regasification water treatment process is based on the injection of a natural product called marine biopolymer into the seawater circuit. This solution limits organic and mineral deposits in the pipes (biofouling) while significantly reducing the use of chlorine (by up to 90% depending on the season), and therefore its impact on the quality of the water discharged. This process offers a number of other environmental benefits: a 100% biodegradable biopolymer digested by the marine environment, no ecotoxicity (BIOCIDE, REACH, endocrine disruptors, etc.) and lower energy consumption (400 MWh/year saved). This fully biodegradable solution is a world first and is set to be rolled out at other LNG carrier terminals in France.

Artelia was commissioned by Elengy to design and build an injection skid with a polymer chassis, including product injection pumps and storage equipment. Our teams were responsible for carrying out the civil engineering, infrastructure works (roads, networks and distribution), piping, boiler making and EIA (electricity, instrumentation and automation), and then commissioning the facilities.