Crowdly

Water flow is stopped

Gas flow rate

increases suddenly

CO₂ outlet

concentration stabilises over time

In an experiment, the

CO₂ inlet concentration is 10% (v/v), and the outlet concentration at steady

state is 2% (v/v). Assuming a dilute system, what is the CO₂ capture efficiency?

90%

20%

60%

80%

In the lab setup, the inlet CO₂ concentration is controlled by adjusting the flow rates of pure air and pure CO₂. If the air flow rate is 900 mL/min and the CO₂ flow rate is 100 mL/min, what is the inlet CO₂ concentration (v/v %)?

15%

20%

10%

If the lab system has an energy penalty of 0.8 kWh/kg CO₂ compared to another system with 1.2 kWh/kg CO₂, how much more efficient is the lab system in terms of energy penalty?

25% lower

50% lower

40% lower

33.3% lower

To calculate power consumption per kg of CO₂ captured, which two measurements are essential?

Total experiment

duration and voltage drop

Total energy consumed

and amount of CO

₂ absorbed

Flow rate of water and inlet pressure

CO₂ concentration and liquid pH

How can we produce effective policy frameworks for CCUS projects? Select all the correct answers.

Engineering aspects should be considered.

Legal liability in leakages of carbon storage projects must be accounted for.

Financial assurance mechanisms are needed.

The policies should be aligned with national climate strategies.

How does the public perception drive CCUS projects? Select all the correct answers.

The social licence of CCUS projects depends on public perception.

The general public determines the suitable carbon dioxide-based products in CCUS projects.

The general public understands the suitable carbon storage sites in the local area.

Otherwise, the CCUS project will be delayed.

In countries where the economies are heavily dependent on fossil fuels, what is the negative impact on the environmental aspects of CCUS?

Extensive CCUS helps such countries in the short to medium term.

Using fossil fuels with CCUS could capture significant amounts of carbon emissions.

The usage of fossil fuel could be extended even without CCUS.

Renewable energy development can be carried out in parallel.

When energy is used to capture carbon dioxide from various carbon emissions, what would be the correct environmental impact?

Energy penalty is relatively low, and thus, the carbon footprint can be neglected.

Energy penalty reduces the environmental benefits gained by CCUS.

Energy penalty is lowest in DAC and thus supports the environmental aspects of CCUS.

Energy penalty does not affect the generated power output, and thus, there are no net effects on the environmental aspects of CCUS.

If CCUS is carried out without policy support from the governments:

The CCUS projects will be profitable with carbon storage projects.

The private companies will get tax credits for their CCUS projects.

The CCUS projects will be reduced with carbon storage.

More private companies will carry out CCUS projects.