| Summary: | 碩士 === 明志科技大學 === 環境與資源工程研究所 === 100 === Gaseous organic pollutants in the air, the removal techniques, including: adsorption, photocatalyst and ozonation, etc., However, because of its treatment effectiveness or side effects to the environment still different hazards or disadvantages, therefore, the application is limited and can’t be universal. This study intends to adopt VUV lamps produce 253.7nm and 185nm wavelength characteristics, so that in the humid air play "O3/UV/H2O" synergistic effects, the use of hydroxyl radical to degradation formaldehyde contamination of indoor air in order to improve the poor performance at low concentrations, while high concentrations harmful to the environment such as missing in the traditional ozone oxidation. In addition, it can be reduce the high cost of materials and maintenance costs for treatment technology of adsorption and photocatalyst. Expect to be a favorable choice as an alternative for the effective removal of organic pollutants in indoor air.
In this study, "purify indoor air quality simulation test box" was designed in the laboratory, test cabinets installed in the vacuum ultraviolet, using its advanced oxidation technologies of "O3/UV/H2O" synergistic effects. For different airflow velocity (0.1m/s, 0.5m/s, 1m/s), different initial concentrations of pollutants (1ppm, 5ppm, 10ppm), the number of different lamps (6, 12, 24) as well as different arrangement may Lamp (radial horizontal, perpendicular to the radial, axial) and other conditions, a series of experiments were conducted to investigate the removal or degradation of performance of formaldehyde.
Preliminary research results are as follows: (1)When the energy is insufficient for purification equipment, VUV lamp for formaldehyde degradation rate α(%), degradation β(mg/m3s), unit energy consumption degradation rate η(mg/m3W) and other performance is not related with different initial concentrations of pollutants, different flow rate, lamp test parameters such as different arrangement. (2)When purification equipment capable of handling capacity, UV lamp for formaldehyde degradation rate α(%), degradation β(mg/m3s) and other performance is low-relationship with lamp different arrangement. (3)VUV lamp for formaldehyde degradation rate α(%) is negative correlation with different initial concentrations of pollutants and different air velocity, and at a certain flow velocity(0.5m/s) conditions, VUV lamp for formaldehyde degradation β(mg/m3s) is positively related to response with different flow rate. (4)At a certain flow velocity(≦0.5m/s) under the conditions, handling the initial concentration of 1ppm formaldehyde contamination, 12 VUV lamp unit energy consumption degradation rate η(mg/m3W) is better than 24 VUV lamps, and when the processing of the initial concentration of 5ppm formaldehyde contaminants, 24 VUV lamp unit energy consumption degradation rate η(mg/m3W) is better than 12 VUV lamps. (5)The air flow velocity of 1m/s under the conditions, from the views of different initial concentrations of pollutants, the number of different lamps and other lamps different arrangement, VUV lamp is almost impossible to play the formaldehyde degradation effect, shows "O3/UV/H2O" synergy promoting effect, if applied to pipe purge, it will affect the flow rate control is an important factor in the effectiveness of the degradation.
Keywords：Vacuum ultraviolet light (VUV), indoor air quality, formaldehyde.
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