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David Llewellyn

David with one of his favourite biofilters

David Llewellyn, M Sc Hort, B Sc Agr (Hort)
Research Assistant, Biofiltration of Indoor Air
Room 1231 Bovey Building
University of Guelph
Guelph, ON
N1G 2W1
519-824-4120 ext 53589

Background on Biofiltration of Indoor Air:

Biofiltration is an alternative to ventilation for maintaining indoor air quality. A biofilter is a microbial community bound to a porous substrate in a thin layer of water called a biofilm. The air stream is actively drawn through the biofilter and exhausted back into the indoor space. As air passes through the substrate, contaminants are transferred into the biofilm where they are subjected to microbial degradation. The substrate-base of our indoor biofilters is comprised of a complex community of higher plants and mosses. The diversity provides many ecological niches for microbial colonization while also having strong aesthetic appeal. To date, indoor biofiltration research has focused on the removal of volatile organic compounds (VOCs). The VOCs that are typically associated with poor quality indoor air range widely in physical properties (including solubility in water) and biodegradability. Studies are conducted in an effort to optimize the removal of this range of contaminants.

Current research projects include the selection of higher plants for biofilters, biofiltration of CO, NOx and ethylene, and a joint project with members of ESA (European Space Agency) on the integration of membrane-based biofilters (BAF) into the MELISSA loop for long-term space travel.

Interests and Duties:

Conduct and oversee various research projects including various graduate student projects. Construction, innovation, maintenance and troubleshooting of research devices and apparatus

Personal Interests:

Cycling; road, mountain, uni, trials
Breaking things and then fixing them "if it ain't broke, break it"
Home renovations
Controlled Environment Systems Research Facility | Ontario Agricultural College
University of Guelph | Guelph | Ontario | Canada | N1G2W1
PHONE: 519.824.4120 EXT 52909
FAX: 519.837.0442