Abstract
Airborne microorganisms are deposited on air filters when these are used to reduce aerosol concentrations in indoor environments. These microorganisms cause various undesirable effects, such as production of unpleasant odors and re-suspension of bacterial and fungal spore bioaerosols into the indoor air. To resolve these issues, we investigated the antimicrobial effects of a natural extract of Mukdenia rossii (Oliv) Koidz and unipolar ion emission against bioaerosols deposited on air filters. The experimental results showed that the natural extract had an antimicrobial effect on the deposited bioaerosols, and that unipolar ion emission enhanced the antimicrobial performance of the natural extract.
Highlights
Indoor environmental conditions affect human health directly because people spend most of their life time indoors, such as in apartments, shopping malls, and public buildings
We investigated the antimicrobial effects of a natural extract of Mukdenia rossii (Oliv) Koidz and unipolar ion emission against bioaerosols deposited on air filters
The experimental results showed that the natural extract had an antimicrobial effect on the deposited bioaerosols, and that unipolar ion emission enhanced the antimicrobial performance of the natural extract
Summary
Indoor environmental conditions affect human health directly because people spend most of their life time indoors, such as in apartments, shopping malls, and public buildings. Concerns over indoor air quality, and the demand for artificial air conditioning and filtration of indoor air are rapidly increasing since people have become conscious of environmental diseases (Douwes et al, 2003). When aerosol particles are captured by air filters, airborne biological particles, such as bacteria and fungi, are simultaneously deposited onto the surface of the filters. These biological particles maintain their viability and grow on the filter under humid conditions. They multiply and spread debris in the air with producing rank odors. Development of an air filtration mechanism that can prevent the growth of biological particles on filters is necessary. Many non-biological aerosol particles are present in the air, and when non-biological dust is deposited
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