Removal of bacteria and fungi in indoor air using various structures of porous catalytic materials

• Main Authors: Yu-Chieh Weng, 翁郁絜
• Other Authors: Chu-Chin Hsieh
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/72591310811259993169

碩士 === 國立雲林科技大學 === 環境與安全衛生工程系碩士班 === 101 === Indoor air quality (IAQ) is a growing national problem. The Legislative Yuan has approved an “Indoor air quality law” on November 8, 2011. Moreover, the Legislative Yuan announced standards of Indoor air pollutants on November 23, 2012. A major factor of poor IAQ in hospitals occurs when mold, bacterial, and fungi multiply. Therefore, the major objective of this research is inventing a material which is inexpensive and is effective as an antibiotic for cleaning indoor air. We experimented with five various components or exteriors porous catalytic materials（Z / AlNaO6Si2, Z / Al3O2, ZH / AlNaO6Si2, ZH / Al3O2 and CH）and tested their pressure loss on different air flow or height of materials. Materials were modified by loading onto them antiseptics, Ag and I2. All of the antiseptic materials were tested for antibiotic effect in a hospital and evaluated for the effectiveness of each material. Most of the highest concentrations of bacteria and fungi in this research were higher than acceptable standards. The experiments showed that the exteriors of the antiseptic materials were ineffective in removing bacteria, but were effective in removing fungi. The reasons were the different conformations and reproductive capacities between bacteria and fungi. Whenever granulous or honeycombed materials existed, the antibiotic effect were Z / Al3O2＞Z / AlNaO6Si2＞CH. Moreover, both Ag and I2 have well established antibiotic effects. Therefore, the characteristic analytic show that I2 decreased after experiment. For this reason, Ag is superior to I2. The air flow and height of materials experiments showed that those with honeycombed materials had low pressure loss. They could lower energy operating costs; however, they also decreased the elapse time. It can decrease operating energy, but also decrease elapsed time. And Moreover, when applying the pressure loss formula of active carbon to antiseptic materials in this research, we were able to calculate the pressure loss of antiseptic materials accurately. The pressure loss formula for antiseptic materials can be applied to design more efficient air conditioner systems in the future. Finally, we calculated the quality required for each material or ventilation system to evaluate effectiveness. It supposed that the concentrations of bacteria and fungi were 2,250 CFU/m3 and 6,750 CFU/m3 at the start, while they were 1,500 CFU/m3 and 1,000 CFU/m3 in the end. The computation showed that if the outflow is higher, and the quality required is higher, then the better antiseptic materials were Z / Al3O2-Ag and ZH / Al3O2-Ag, because their required qualities were less than the others. The requiring quality of ZH / Al3O2-Ag and Z / Al3O2-Ag to remove bacteria is 1,040 g and 1,588 g, and to remove fungi it is 9,026 g and 6,159 g in an air-cleaning machine system. ZH / Al3O2-Ag has not only lower energy operating costs, but it also is a more effective antibacterial as well. Z / Al3O2-Ag is also an effective antibiotic for cleaning indoor air. Both of them can be used to clean indoor air in the future.