Removal of carbon dioxide in the indoor environment with sorption-type air filters

Abstract

Carbon dioxide in an indoor environment is one of the air pollutants monitored by the Indoor Air Quality Ordinance of Taiwan. It is necessary for people and the air-conditioning industry to take appropriate measures to minimize the emission and prevent creating an unacceptable indoor air quality (IAQ). This study presents the performance of sorption-type air filters to help people and the air-conditioning industry to understand and apply the best practical control to prevent CO2 emissions from causing IAQ problems. The adsorption of CO2 with a sorption-type filter with activated carbon before and after impregnating treatment has been investigated. It has been found that impregnation treatment with MgO and CaO can promote the adsorption of CO2 on a sorption-type filter, with MgO being the better of the two.