A greenhouse operator in Vienna has introduced one of Europe’s first carbon capture systems designed specifically for agricultural use, transforming CO2 from a heating boiler into a valuable fertilizer for crops. Local tomato grower Martin Merschl recently replaced his natural gas heater with a modern biomass system that not only warms his greenhouses but also supplies carbon dioxide to boost plant growth.
Merschl explained that the process begins with burning wood chips to generate heat for the greenhouse. Instead of allowing the resulting CO2 to escape into the air, the system captures it and channels it into the greenhouse where it supports plant development. He said that while carbon dioxide is a concern when released into the atmosphere, inside a controlled environment it can significantly increase vegetable yields.
To make this possible Merschl installed a network of plastic tubes that carry the captured CO2 directly from the heating system to the tomato plants. However the gas cannot be used immediately. Merschl noted that CO2 produced by burning wood is not clean and must undergo treatment. A complex filtering system removes impurities from the flue gas before it reaches the plants.
The exhaust from the biomass boiler passes through tanks designed to remove sulfite and other harmful substances. Once processed the system produces about twelve tonnes of purified CO2 every day which is then piped into the greenhouse. The tomato plants absorb most of the gas during photosynthesis although the carbon eventually returns to the atmosphere once the tomatoes are consumed and digested. Even so the project demonstrates the growing potential of carbon capture technology in agriculture.
Energy engineering expert Tobias Pröll of BOKU University said the most innovative aspect of the system is the filtering process. Flue gas typically contains only around ten percent carbon dioxide making it challenging to extract efficiently. The new system manages to concentrate this into nearly pure CO2 which he described as an important technological step toward long term climate goals. Pröll said such advancements will be essential if societies aim to achieve net zero emissions in the future.
The system required a substantial investment of about fourteen million dollars. Merschl admitted that the cost was high but said the benefits make it worthwhile. He pointed out that natural gas supplies have been unpredictable in recent years causing uncertainty for farmers who depend on stable heating. With the new biomass based system he now has a reliable energy source along with healthier and more productive tomato crops.
The project highlights how innovative engineering and sustainable farming can work together and suggests a possible path for future greenhouse operations looking to reduce emissions while improving yields.
