Modeling Analysis on Removal of Gaseous Formaldehyde by Planting and TiO2 Photocatalyst for Improving Indoor Air Quality

• Main Authors: Ming Wei-Lin, 林明煒
• Other Authors: Yew Khoy-Chuah
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/uu7pcf

博士 === 國立臺北科技大學 === 冷凍空調工程系所 === 105 === With the development of industrialization and urbanization, the indoor air quality is receiveing attention for people in modern life.Formaldehyde is the most common volatile organic compounds (VOCs) emitted from household materials and is associated with many health risks, including sick building syndrome. Human exposure to VOCs indoors is receiving increasing attention. In this study, a simple box model was developed and applied to help understand the fate and degradation mechanisms of formaldehyde in the indoor environment. The model was validated using observations from an air handling system under different conditions. Three parameters, temperature, relative humidity, and circulation wind speed, were investigated for their effects on the performance of the air handling system. Our results show that the operation mode of the air handling system has a greater effect on the removal of formaldehyde than any of the air conditioning parameters. From a kinetic perspective, the removal of gaseous formaldehyde from a constant-volume box clearly represents a zero-order reaction. After photocatalytic biodegradation for 2 hours, the removal efficiency of gaseous formaldehyde increases to approximately 90%. While the natural dissipation, photodegradation and photocatalytic oxidation decomposition accounted for 12%, 30% and 58% of the total formaldehyde removal A novel emitting source of volatile pollutants was applied on the air quality monitoring experiment to mimic the non-ventilated workplace. A potted Hedera helix was used as an air purifier to remove the gaseous formaldehyde. The environmental conditions and the pollutants concentrations in air were measured in real time and the monitoring data would be uploaded on a cloud storage media by wireless technique. Our results demonstrate that the 70% decrease of required time to achieve 1.0 ppm of gaseous formaldehyde was performed by the biological purifier, compared with the natural dissipation. And, the effect of photo-regulation was not significant in the planting to remove gaseous formaldehyde. Our results have implications for reducing indoor air pollution and reducing stress on air conditioning systems. A platform was demonstrated for the public to determine if the health risks of VOCs represent a significant reduction in their building. Meeting these goals is beneficial for human health and energy conservation in modern society.