The idea of the carbon capture system is an idea that I came up with solely on my own. However I received help in the creation of the model of the carbon capture system from a fellow classmate called Wainaina Mary Wanjiku who also attends Pangani Girls High School.
The biochar-based carbon capture system is a chimney-integrated filter designed to reduce carbon dioxide emissions during combustion. Structurally, it consists of a heat-resistant outer housing containing a cartridge packed with biochar—a porous material with high surface area ideal for gas adsorption. As smoke rises, it enters the filter chamber where internal baffles slow and distribute the gas flow, increasing contact time with the biochar. Carbon dioxide molecules are physically adsorbed onto the surface of the biochar through van der Waals forces, effectively trapping them. The filtered smoke then exits through the outlet, now containing significantly less CO₂. A mesh screen prevents particle escape, while insulation protects the biochar from combustion. This modular system allows for easy replacement of saturated biochar and is ideal for stoves, kilns, or small-scale industries seeking low-cost, sustainable emission control.
To promote the biochar carbon capture system in my school and neighborhood, I would hold awareness sessions using posters, models, and demos to show how it reduces smoke and CO₂. I’d present during school events and local gatherings, and share simple guides on how to build the system. I’d also use social media and flyers to spread the message. To encourage adoption, I’d help install sample units in schools or homes. To check efficiency, I’d give out questionnaires asking users about smoke levels, ease of use, and air quality before and after using the system. I’d analyze the feedback and share results to inspire more people to use it.
Build a heat-resistant chamber to fit in a chimney. Add a mesh base inside to hold biochar pellets. Insert baffles to slow smoke and increase contact with the biochar. Add a mesh screen on top to stop particles escaping. Insulate the chamber and install it in the chimney. Make it removable for easy biochar replacement and maintenance.
