Last month’s European carbon dioxide (CO2) supply shortage sent shockwaves through food and beverage markets as a combination of factors left manufacturers desperate for product.
“The CO2 shortage made us experience that the bubbles in our fizzy drinks are an exhaust gas from chemical plant,” says Climeworks’ Marketing Manager Valentin Gutknecht.
“I hope that this has also raised awareness that cleaner and more reliable alternatives for CO2 supply are also available.”
One of these alternatives is Direct Air Capture (DAC) technology.
Switzerland-based Climeworks pioneered and launched the world’s first commercial-scale direct air capture (DAC) plant in 2017, featuring a patented technology that filters CO2 from ambient air. The CO2 captured by Climeworks can be used to carbonate beverages or produce climate-neutral fuels and other materials.
Capturing CO2 locally for industrial uses enables customers to reduce their emissions and lessen their dependence on fossil fuels, as currently most industrial CO2 is transported from fossil point sources via truck to industries on site. It could also help some end-users like beverage bottling plants to avoid the worst effects of such CO2 supply shortages, by providing a level of self-sufficiency in their operations.
“We certainly don’t claim that we are an immediate solution to the whole industry’s problems, as building up capacities to delivers millions of tons of CO2 takes time,” explains Gutknecht. “We do, however, offer a real alternative to bottling companies who are looking for a cleaner and more reliable source of CO2.”
In comparison to other carbon capture technologies, a modular Climeworks plant can be employed almost anywhere. Direct air capture technology is capable of capturing CO2 from ambient air wherever atmospheric air is available and the gas is needed, Gutknecht says.
“We certainly don’t claim that we are an immediate solution to the whole industry’s problems…We do, however, offer a real alternative to bottling companies who are looking for a cleaner and more reliable source of CO2”
Climeworks has been developing the technology since 2009 and commissioned its first industrial-scale CO2 capture unit in late 2014 dubbed the ‘CO2 Collector’, which captures 50 tonnes of CO2 per year. Its plants capture atmospheric carbon with a filter; air is drawn into the plant and the CO2 within the air is chemically bound to the surface of a sorbent (the filter). Once the filter is saturated with CO2 it is heated (using mainly low-grade heat as an energy source) to around 100°C. The CO2 is then released from the filter and collected as concentrated CO2 gas, which can then be purified and delivered as high purity CO2 for carbonating beverages, for example.
“Our system is therefore especially attractive wherever both CO2 is needed and sources of low-grade heat are available,” enthuses Gutknecht.
Now patented, the technology has continued to develop in the last half-decade and Climeworks launched its first commercial plant in Hinwil, Switzerland back in 2017.