Journal
ENVIRONMENTAL POLLUTION
Volume 157, Issue 3, Pages 748-754Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2008.11.019
Keywords
Horizontal subsurface constructed wetlands; Nitrous oxide; Methane; Artificial aeration; Macrophytes
Categories
Funding
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- NSERC Discovery
- FQRNT Strategic
- NSERC Strategic
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Greenhouse gas (GHG) emissions by constructed wetlands (CWs) could mitigate the environmental benefits of nutrient removal in these man-made ecosystems. We studied the effect of 3 different macrophyte species and artificial aeration on the rates of nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4) production in CW mesocosms over three seasons. CW emitted 2-10 times more GHG than natural wetlands. Overall, CH4 Was the most important GHG emitted in unplanted treatments. Oxygen availability through artificial aeration reduced CH4 fluxes. Plant presence also decreased CH4 fluxes but favoured CO2 production. Nitrous oxide had a minor contribution to global warming potential (GWP < 15%). The introduction of oxygen through artificial aeration combined with plant presence, particularly Typha angustifolia, had the overall best performance among the treatments tested in this study, including lowest GWP, greatest nutrient removal, and best hydraulic properties. (C) 2008 Elsevier Ltd. All rights reserved.
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