Biofiltration of airborne VOCs with green wall systems : microbial and chemical dynamics
Mikkonen, A., Li, T., Vesala, M., Saarenheimo, J., Ahonen, V., Kärenlampi, S., Blande, J. D., Tiirola, M., & Tervahauta, A. (2018). Biofiltration of airborne VOCs with green wall systems : microbial and chemical dynamics. Indoor Air, 28(5), 697-707. https://doi.org/10.1111/ina.12473
Published inIndoor Air
Li, Tao |
© 2018 John Wiley & Sons A/S.
Botanical air filtration is a promising technology for reducing indoor air contaminants, but the underlying mechanisms need better understanding. Here, we made a set of chamber fumigation experiments of up to 16 weeks of duration, to study the filtration efficiencies for seven volatile organic compounds (VOCs; decane, toluene, 2‐ethylhexanol, α‐pinene, octane, benzene, and xylene) and to monitor microbial dynamics in simulated green wall systems. Biofiltration functioned on sub‐ppm VOC levels without concentration‐dependence. Airflow through the growth medium was needed for efficient removal of chemically diverse VOCs, and the use of optimized commercial growth medium further improved the efficiency compared with soil and Leca granules. Experimental green wall simulations using these components were immediately effective, indicating that initial VOC removal was largely abiotic. Golden pothos plants had a small additional positive impact on VOC filtration and bacterial diversity in the green wall system. Proteobacteria dominated the microbiota of rhizosphere and irrigation water. Airborne VOCs shaped the microbial communities, enriching potential VOC‐utilizing bacteria (especially Nevskiaceae and Patulibacteraceae) in the irrigation water, where much of the VOC degradation capacity of the biofiltration systems resided. These results clearly show the benefits of active air circulation and optimized growth media in modern green wall systems. ...
PublisherWiley-Blackwell Publishing, Inc.
Publication in research information system
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Related funder(s)European Commission
Funding program(s)FP7 (EU's 7th Framework Programme)
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingWe gratefully acknowledge Phil Hollins, Sini Burdillat, Hobo Kukkonen, and Alvaro Cortés Molino for help with the experimental work. The study was supported by funding from the European Research Council (ERC) under the European Union's Seventh Framework Programme (FP/2007‐450 2013, grant agreement no. 615146) awarded to M.T., Tekes—the Finnish Funding Agency for Innovation R&D and pilot project funding (no. 3405/31/2015) awarded to Naava Ltd. ...
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