| Summary: | 碩士 === 雲林科技大學 === 環境與安全工程系碩士班 === 98 === After SARS broke out in 2003, the indoor air quality demand by
compatriot''s requirement are rigid, air purification equipments and systematic
circulation of air conditioners are main methods used for indoor air purification
currently, however, the efficiency is very limited. The environmental protection
administration had modified the proposing value of indoor air quality standard
in 2005, the permit proposing value of formaldehyde is 0.1 ppm, the bacterium
proposing value are 500 and 1000 CFU/m3 in category 1 location and category
2 location accordingly, the fungus proposing value is 1000 CFU/m3.
Zeolite is a porous material with advantages of large surface areas and
high selectivity, it can remove different pollutants and also to be combined
with metals to form the catalyst zeolite; For example, zeolite combined with
platinum can efficiently oxidize propane. Moreover, the efficiency of
bactericidal metals can be increased by combining with zeolite, for instance,
zeolite combined with silver can effectively sterilizes E. coli and S. faecalis.
In this research, zeolite is used as a carrier, combined 1 wt% of metal
platinum and silver by impregnation method to form adsorbent (ZP1) and
bactericidal (ZS1) of the catalyst zeolite respectively, through the fixed bed
device to carry adsorption efficiency test with ZP1 catalyst zeolite. In addition
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carries on the bactericidal test for ZS1 catalyst zeolite by fixed bed and to do
the application test by scene test tank. A pollutant test of formaldehyde,
bacterium and fungus is carried after character analysis. The result of EDS
element analysis showed the metal amount is closed to the assumed amount of
1 wt%.
The result of formaldehyde absorb test shows improvement after
combined with metal platinum, it also makes the adsorption curve more steep
which is more conducive to the use in mass transfer areas and also shorten the
desorption time. As for the laboratory test result for lifespan of the bactericidal
efficiency, the efficiency is 97% and 98% for the bacterium and fungus include
the silver bactericidal of the catalyst zeolite. Before the experiment, the average
colonies of bacterium and the fungus in the atmosphere are 3450 CFU/m3 and
4433 CFU/m3 respectively, after atmosphere test, figures dropped to 700
CFU/m3 and 400 CFU/m3 respectively, which proves the bactericidal capability
of the catalyst zeolite against bacterium and fungus. On the other hand, during
the bactericidal test, the bactericidal efficiency is 67 ~ 70% for bacterium, 79 ~
93% for fungus, 69 ~ 89% for Candida albicans, and 62 ~ 77% for S. aureus
respectively by fill in one-layer of the catalyst zeolite bactericidal condition.
The bactericidal efficiency against E. coli and P. aeruginosa could not be
identified since both of them were not collected during the test. In bactericidal
test by filling in three-layer of the catalyst zeolite bactericidal, the efficiency is
79% and 90% for bacterium and fungus respectively; In this case, the
bactericidal efficiency is not effectively increased due to the air residence
caused by larger vacant space in mezzanine.
The silver bactericidal of the catalyst zeolite result substituted into a
different models to calculate adsorption constant (k value) .The result
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showed that the Adams-Bohart model is better than other dynamic models.
The Adams-Bohart model is suitable for the silver catalyst zeolite in the
medical organization and hospital in this research.
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