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“Carbon sink”: producing green energy while reducing greenhouse gases


Developed by SUEZ and Fermentalg, the “carbon sink” solution aims to purify air and produce green energy, transforming CO2 into a resource. It was presented for the first time at the COP21 Solutions exhibition at the Grand Palais. Explanations.

The carbon sink is an innovation that operates based on the principle of capturing CO2 through photosynthesis. It consists of a water-filled tank in which microalgae are cultivated. These microalgae have the capacity to fix CO2: a carbon sink with 1 cu.m of water can fix the same quantity of CO2 as 100 trees.
Within the sink, the microalgae multiply continuously and form a biomass, which is evacuated via the waste network to the treatment plant. At the treatment plant, this biomass can be recovered as biomethane, a green energy that can be used to supply city gas networks.

Set up in urban or industrial environments, the carbon sink, depending on how it is used, can absorb 1 to 10,000 tons of CO2. It will enable local municipalities to effectively respond to the issues involved with climate change, while being fully aligned with a circular economy approach.

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