Carbon capture, nature-based solutions and other sinks
Point 5 of 7 — Renewable Energy Sources, Green Hydrogen and Climate AdaptationQuestion bank: 0 questions (0 with pictures)
05 Carbon capture, nature-based solutions and other sinks
Post-combustion capture: flue gas is bubbled through an amine solution that chemically binds CO₂; the solvent is then regenerated by heating and the CO₂ is compressed.
Oxy-fuel combustion: burning in pure oxygen gives a flue gas of almost only CO₂ and water, easy to condense and capture.
Pre-combustion: the fuel is gasified first and the CO is shifted to CO₂ before combustion — used with IGCC plants and hydrogen production.
Direct air capture: solid sorbents or alkaline solutions take CO₂ straight from ambient air; expensive because the CO₂ is only about 0.04% of the air.
Mineralisation and utilisation: CO₂ into carbonated aggregates, urea, methanol or plastics; permanent storage in deep saline aquifers under an impermeable cap rock, monitored for leakage.
Nature-based solutions: mangroves, seagrass and salt marshes store blue carbon in their waterlogged soils at rates far above terrestrial forest; soils, peatlands and forests are the other major sinks. Protecting what exists is cheaper than rebuilding it.
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