Blog: From waste to liquid CO2

Your residual waste serves as a source for the production of liquid CO2. This may sound complicated. That is why we are all too happy to explain how we capture CO2 and recycle waste.

Impressie CO2 afvang

We are currently in the midst of a resource and energy transition. In the future, energy will have to be generated almost completely sustainably. Raw materials will have to be used sparingly and reused as much as possible. Twence is trying to bring as much waste as possible back into the cycle, making an important contribution to the circular economy. However, there is always certain residual and business waste that cannot be recycled and which is therefore processed in our Waste-To-Energy Plant (WTE).

Waste is a source of energy
Twence mainly generates energy from non-reusable residual waste and industrial waste processed in the WTE. Twence is the largest producer of sustainable energy in Overijssel. Twence produces 502 GWh of sustainable heat and 290 GWh of sustainable electricity annually. That is enough to supply 65,600 households with heat and around 150,000 households with electricity for a year. What used to be regarded as waste is now a source of energy.

CO2 from flue gases in 3 stages
During the combustion process in the WTE, flue gases are generated. Flue gases contain CO2. This CO2 is extracted from the flue gases in three stages. During the first stage, the flue gases are cooled together with the CO2. In the second stage, the CO2 is absorbed from the flue gases using solvent. The flue gases without CO2 are returned to the WTE. In the third stage, the flue gases with CO2 are separated as pure gas from the solvent by boiling it with residual heat from the WTE. However, in order to transport it, the CO2 must be liquid.

Under pressure, everything liquefies
The gaseous CO2 is captured, dried, further purified and liquefied by pressurizing and cooling it. The CO2 is then stored for subsequent transportation to the end user.

Closing loops

Your residual waste is not only a source of energy. As demonstrated, we also extract raw materials such as liquid CO2 to make greenhouse farming more sustainable. And so this closes the loop, enabling us to make a great contribution to the circular economy together!

Capturing 100,000 tonnes of CO2
Twence is currently constructing a large-scale CO2 capture plant that will be able to capture up to 100,000 tonnes of CO2. The plant is expected to be operational by the end of 2023.

Would you like to know more? Please visit our website.

Together towards a sustainable region.