A dynamic botanical air purifier (DBAP) with activated carbon root-bed for reducing indoor carbon dioxide levels

Abstract

Indoor Air Quality (IAQ), is important in buildings because it can affect an occupant's health and productivity. Carbon Dioxide (CO2) is a main indicator of IAQ. 4 decades ago, researchers discovered the potential for indoor plants to remediate indoor air pollutants via photosynthesis. This study investigates the CO2 removal rate when a Maranta Leuconeura is paired with activated carbon (AC), as well as a mechanical ventilation system that draws air into its root-bed making it an active system (DBAP). The results were compared to passive systems i.e plant with AC, potting soil etc. The study was conducted in a 0.7 m3 Plexiglas chamber with initial CO2 concentrations of 1500±100 ppm while initial temperatures ranged between 24 ± 2°C for a duration of 6 hours continuously. Results showed, the DBAP reduced CO2 levels by 40.90% while a passive plant with AC only, was able to lower CO2 levels by 15.20%. The other passive systems did not reduce CO2 levels. All systems were able to raise humidity and reduce temperature in the chamber, with the exception of the DBAP, which slightly increased the temperature in the chamber.