[Digestion] What happens to CO2 when scrubbed out of biogas?

[Lou Dobb]

Okay, I'm a bit of a lay man, but I wonder what happens to the CO2 if it is scrubbed out of biogas by water washing.

And, importantly, wouldn't it be possible to store this CO2 underground (as in carbon capture and storage systems; in depleted oil fields)? This would make biogas carbon-negative.

In principle you could make ultra-clean biogas near a carbon sequestration site (independently of power plants), store the carbon there, and export the carbon-negative biomethane which is now upgraded to natural gas quality.

You would get a premium for this carbon-negative gas (carbon currently costs €20 per ton, but this is expected to increase significantly).

So has anyone thought about coupling biogas production to CCS?

       
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