of test results:
|Figure 1 Control (No treatment with
Plate A: Control 1 ft.
Plate A: Control 2 ft.
Plate A: Control 4 ft.
shows the number of microbial colonies produced in the Control set,
before any treatment of indoor air with the air purifier.
|Figure 2 (After
24 hr treatment with air purifier)
Plate A: 24 hr, 1 ft.
Plate A: 24 hr, 2 ft.
Plate A: 24 hr, 4 ft.
2 shows the petri-plates after a 24 hour treatment with the air
purifier. Note the reduction in number of colonies compared to figure
1 (Control, No treatment with air purifier).
was also evidenced that the petri-plates placed closer to the distance
to the air purifier (1ft. and 2 ft.) produced least number of colonies
after 24h., 48h. and 72 hours of treatment of the indoor air with
the air purifier. Figure-3 shows the level of infection after 24
hours with distances 1 ft, 2ft. and 4 ft. away from the air purifier.
There was very minor trace of inoculums from the petri-plates from
1 ft. or 2 ft. and 4 ft. distances after 24 hours of treatment of
the room air indicating thereby definite reduction of the microbial
aeroallergen in the room air. After 72 hours of treatment of the
indoor air with the air purifier there was almost no micro flora
or propagules left in the indoor air since there was no microbial
colony produced on the petri-plates. All the experiments were carried
out with setting at High in the air purifier. Figure 1 shows the
Control plates without any treatment. All the 3 petri plates from
the setup of 1ft, 2ft and 4 ft show vigorous growth of the microbial
colonies after incubation in an incubator at 37 degrees Celsius.
Number of microbial colonies produced
after 24 hours in Control (no Air Purifier)
Effect of air purifier after different periods of exposure
on the number of microbial colonies.
the figure-2 is a graph on the distribution of the number of microbial
colonies before and after the treatment of indoor air with the air
purifier, it is very clear that there was a gradual reduction in
the number of microbial (bacterial and fungal) colonies with greater
interval of exposure with the air purifier.
Effect of treatment of air purifier on the concentration
of indoor aeroallergen concentration.
petri plates from the set up of 24 hour treatment with air purifier
from distances 1ft, 2ft and 4 ft from the air purifier showed no
significant microbial growth. At the distance of 1 ft no microbial
colony was recorded on the petri-plate while the petri plates from
2 and 4ft showed very minor trace of inoculums. Figure 4 shows the
distribution of the aeroallergen count after the treatment of the
room air after 24hour, 48 hour and 72 hours. After 72 hours of treatment
there was almost no aeroallergen left closure to the air purifier.
full abstract from West Texas A&M University