Laboratory experiments on indoor bioaerosol deposition onto various surface materials

Vuokko Lappalainen, Anniina Salmela, Markus Honkanen, Aku Karvinen, Ilpo Kulmala, Pertti Pasanen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Increasingly, people spend their time indoors and at the same time cases of unacceptable indoor air quality are on the rise. Poor indoor air quality has been shown to cause respiratory symptoms, irritation, and other short- and long-term health outcomes. Indoor air quality problems are usually complex and a sum of several factors or failures in the building or structures. Unbalanced or poorly maintained ventilation system induces uncontrolled air leakages through building envelope. In case of moisture damage, air leakages may transport microbial spores, smaller fragments and metabolic products from microbial growth inside building structures into indoor environment, surfaces and air. In BITEFA project, bioaerosol deposition on various surface materials and flow fields were studied with Penicillium brevicompactum spores in a duct form test chamber. The air velocities of the system were similar to those in ventilated apartment buildings. Three commonly used materials were placed on horizontal and vertical surfaces at various flow field locations in the test chamber. Deposition was measured with cultural based and digital microscopic methods. As expected, clear differences were observed on deposition rates which was highest for horizontal upward facing surfaces and lowest for ceiling with low air velocity. Results indicate that viable bioaerosol deposition rate is highly dependent on particle size, air velocity and air flow direction towards the surface. Smaller non-viable particles are available deposit on all surfaces, vertical and horizontal. Because of smaller size of particles, the gravitation is not the major deposition mechanism. Small particles deposit by interception and diffusion. This study gives more information on practice of surface bioaerosol sampling in indoor environment investigations.
Original languageEnglish
Title of host publicationProceedings of IAQVEC 2016
Publication statusPublished - 2016
MoE publication typeA4 Article in a conference publication
Event9th International Conference on Indoor Air Quality Ventilation & Energy Conservation, IAQVEC 2016 - Songdo, Korea, Republic of
Duration: 23 Oct 201626 Oct 2016

Conference

Conference9th International Conference on Indoor Air Quality Ventilation & Energy Conservation, IAQVEC 2016
Abbreviated titleIAQVEC 2016
CountryKorea, Republic of
CitySongdo
Period23/10/1626/10/16

Fingerprint

air
indoor air
air quality
flow field
leakage
spore
interception
material
laboratory experiment
airflow
ventilation
particle size
moisture
damage
sampling
particle
test
rate
indoor environment

Keywords

  • indoor air quality
  • bioaerosols
  • deposition

Cite this

Lappalainen, V., Salmela, A., Honkanen, M., Karvinen, A., Kulmala, I., & Pasanen, P. (2016). Laboratory experiments on indoor bioaerosol deposition onto various surface materials. In Proceedings of IAQVEC 2016 [Particle 1222]
Lappalainen, Vuokko ; Salmela, Anniina ; Honkanen, Markus ; Karvinen, Aku ; Kulmala, Ilpo ; Pasanen, Pertti. / Laboratory experiments on indoor bioaerosol deposition onto various surface materials. Proceedings of IAQVEC 2016. 2016.
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abstract = "Increasingly, people spend their time indoors and at the same time cases of unacceptable indoor air quality are on the rise. Poor indoor air quality has been shown to cause respiratory symptoms, irritation, and other short- and long-term health outcomes. Indoor air quality problems are usually complex and a sum of several factors or failures in the building or structures. Unbalanced or poorly maintained ventilation system induces uncontrolled air leakages through building envelope. In case of moisture damage, air leakages may transport microbial spores, smaller fragments and metabolic products from microbial growth inside building structures into indoor environment, surfaces and air. In BITEFA project, bioaerosol deposition on various surface materials and flow fields were studied with Penicillium brevicompactum spores in a duct form test chamber. The air velocities of the system were similar to those in ventilated apartment buildings. Three commonly used materials were placed on horizontal and vertical surfaces at various flow field locations in the test chamber. Deposition was measured with cultural based and digital microscopic methods. As expected, clear differences were observed on deposition rates which was highest for horizontal upward facing surfaces and lowest for ceiling with low air velocity. Results indicate that viable bioaerosol deposition rate is highly dependent on particle size, air velocity and air flow direction towards the surface. Smaller non-viable particles are available deposit on all surfaces, vertical and horizontal. Because of smaller size of particles, the gravitation is not the major deposition mechanism. Small particles deposit by interception and diffusion. This study gives more information on practice of surface bioaerosol sampling in indoor environment investigations.",
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Lappalainen, V, Salmela, A, Honkanen, M, Karvinen, A, Kulmala, I & Pasanen, P 2016, Laboratory experiments on indoor bioaerosol deposition onto various surface materials. in Proceedings of IAQVEC 2016., Particle 1222, 9th International Conference on Indoor Air Quality Ventilation & Energy Conservation, IAQVEC 2016, Songdo, Korea, Republic of, 23/10/16.

Laboratory experiments on indoor bioaerosol deposition onto various surface materials. / Lappalainen, Vuokko; Salmela, Anniina; Honkanen, Markus; Karvinen, Aku; Kulmala, Ilpo; Pasanen, Pertti.

Proceedings of IAQVEC 2016. 2016. Particle 1222.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Laboratory experiments on indoor bioaerosol deposition onto various surface materials

AU - Lappalainen, Vuokko

AU - Salmela, Anniina

AU - Honkanen, Markus

AU - Karvinen, Aku

AU - Kulmala, Ilpo

AU - Pasanen, Pertti

PY - 2016

Y1 - 2016

N2 - Increasingly, people spend their time indoors and at the same time cases of unacceptable indoor air quality are on the rise. Poor indoor air quality has been shown to cause respiratory symptoms, irritation, and other short- and long-term health outcomes. Indoor air quality problems are usually complex and a sum of several factors or failures in the building or structures. Unbalanced or poorly maintained ventilation system induces uncontrolled air leakages through building envelope. In case of moisture damage, air leakages may transport microbial spores, smaller fragments and metabolic products from microbial growth inside building structures into indoor environment, surfaces and air. In BITEFA project, bioaerosol deposition on various surface materials and flow fields were studied with Penicillium brevicompactum spores in a duct form test chamber. The air velocities of the system were similar to those in ventilated apartment buildings. Three commonly used materials were placed on horizontal and vertical surfaces at various flow field locations in the test chamber. Deposition was measured with cultural based and digital microscopic methods. As expected, clear differences were observed on deposition rates which was highest for horizontal upward facing surfaces and lowest for ceiling with low air velocity. Results indicate that viable bioaerosol deposition rate is highly dependent on particle size, air velocity and air flow direction towards the surface. Smaller non-viable particles are available deposit on all surfaces, vertical and horizontal. Because of smaller size of particles, the gravitation is not the major deposition mechanism. Small particles deposit by interception and diffusion. This study gives more information on practice of surface bioaerosol sampling in indoor environment investigations.

AB - Increasingly, people spend their time indoors and at the same time cases of unacceptable indoor air quality are on the rise. Poor indoor air quality has been shown to cause respiratory symptoms, irritation, and other short- and long-term health outcomes. Indoor air quality problems are usually complex and a sum of several factors or failures in the building or structures. Unbalanced or poorly maintained ventilation system induces uncontrolled air leakages through building envelope. In case of moisture damage, air leakages may transport microbial spores, smaller fragments and metabolic products from microbial growth inside building structures into indoor environment, surfaces and air. In BITEFA project, bioaerosol deposition on various surface materials and flow fields were studied with Penicillium brevicompactum spores in a duct form test chamber. The air velocities of the system were similar to those in ventilated apartment buildings. Three commonly used materials were placed on horizontal and vertical surfaces at various flow field locations in the test chamber. Deposition was measured with cultural based and digital microscopic methods. As expected, clear differences were observed on deposition rates which was highest for horizontal upward facing surfaces and lowest for ceiling with low air velocity. Results indicate that viable bioaerosol deposition rate is highly dependent on particle size, air velocity and air flow direction towards the surface. Smaller non-viable particles are available deposit on all surfaces, vertical and horizontal. Because of smaller size of particles, the gravitation is not the major deposition mechanism. Small particles deposit by interception and diffusion. This study gives more information on practice of surface bioaerosol sampling in indoor environment investigations.

KW - indoor air quality

KW - bioaerosols

KW - deposition

M3 - Conference article in proceedings

SN - 979-11-959724-0-1

BT - Proceedings of IAQVEC 2016

ER -

Lappalainen V, Salmela A, Honkanen M, Karvinen A, Kulmala I, Pasanen P. Laboratory experiments on indoor bioaerosol deposition onto various surface materials. In Proceedings of IAQVEC 2016. 2016. Particle 1222