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What is hydrothermal gasification?

Hydrothermal gasification consists in treating wet or water-miscible organic waste (sludge, agricultural and food residues, agricultural and industrial effluents, etc.) at high temperature, between 360°C and 700°C, and at very high pressure, between 210 and 350 bar.

This thermochemical conversion process is used to transform organic matter into synthetic
gas, also known as syngas, which contains high levels of methane and hydrogen. It can also
be used to separate and recover from metals, minerals (phosphorous, potassium, etc.),
nitrogen and clear water. Recyclable elements from other industries, in particular for
irrigation and agricultural fertilisation.

During the hydrothermal gasification process, more than 85% of waste can be converted into
syngas. It is then combined with hydrogen by methanation to produce synthetic methane.

This high growth potential sector should undergo an industrialisation by 2027, ensuring an
estimated production capacity of 50 TWh/year by 2050.*

*Source : Panorama des gaz renouvelables 2023 publié en avril 2024

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