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Carbon Capture, Utilization, and Storage (CCUS)

Carbon Capture, Utilization, and Storage (CCUS) is a suite of technologies aimed at mitigating climate change by preventing large quantities of carbon dioxide (CO₂) from entering the atmosphere. It involves capturing CO₂ emissions from sources like power plants and industrial facilities, and either storing it underground or utilizing it in various industrial processes. CCUS is increasingly recognized as a crucial component of achieving net-zero emissions goals globally.

How CCUS Works: A Three-Step Process

CCUS isn’t a single technology, but rather a process with three main stages:

1.Capture

The first step involves separating CO₂ from other gases produced in industrial processes. There are three primary capture methods:

• Post-Combustion Capture: This is the most common method, capturing CO₂ from flue gases after fuel is burned. It typically uses solvents to absorb the CO₂. IEA Report on CCUS
• Pre-Combustion Capture: This method converts the fuel into a mixture of hydrogen and CO₂ before combustion. The CO₂ is then separated, and the hydrogen is used as fuel.
• Oxy-Fuel Combustion: This involves burning fuel with pure oxygen instead of air,resulting in a flue gas that is primarily CO₂ and water vapor,making CO₂ capture easier.

2. Transport

Once captured, the CO₂ needs to be transported to a storage or utilization site. This is typically done via pipelines, but can also involve ships or trucks, especially for smaller volumes or remote locations. Pipeline transport is generally the most cost-effective option for large-scale CO₂ transfer. U.S. Department of Energy – Carbon Transport

3. Utilization or Storage

This is the final stage,where the captured CO₂ is either permanently stored or used in a beneficial way.

CO₂ Utilization: Turning Waste into Resources

CO₂ utilization, also known as carbon recycling, involves using captured CO₂ as a feedstock to create valuable products. Examples include:

• Enhanced Oil Recovery (EOR): Injecting CO₂ into oil reservoirs to increase oil production. While this generates revenue, it’s often debated due to the continued reliance on fossil fuels.
• Building Materials: CO₂ can be used to create stronger and more sustainable concrete and other building materials. Carbon Leadership Forum – Concrete
• Chemicals and Fuels: CO₂ can be converted into various chemicals, such as methanol and ethanol, and even synthetic fuels.
• Food and Beverage Industry: CO₂ is used for carbonating beverages and in food packaging.

CO₂ Storage: Permanent Underground Disposal

Geological storage involves injecting CO₂ deep underground into porous rock formations, such as depleted oil and gas reservoirs or saline aquifers. These formations are capped by impermeable layers of rock that prevent the CO₂ from escaping. Long-term monitoring is crucial to ensure the CO₂ remains safely stored. EPA – Geologic Sequestration of CO₂

The Role of CCUS in Climate Change Mitigation

CCUS is considered a vital technology for achieving ambitious climate goals, especially in sectors where emissions are difficult to eliminate through other means, such as cement and steel production. The Intergovernmental Panel on Climate Change (IPCC) highlights CCUS as a key technology in many scenarios for limiting