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Two-year performance of single-stage vertical flow treatment wetlands planted with willows under cold-climate conditions

Zhanna Grebenshchykova, Jacques Brisson, Florent Chazarenc and Yves Comeau

Article (2020)

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Cite this document: Grebenshchykova, Z., Brisson, J., Chazarenc, F. & Comeau, Y. (2020). Two-year performance of single-stage vertical flow treatment wetlands planted with willows under cold-climate conditions. Ecological Engineering, 153. doi:10.1016/j.ecoleng.2020.105912
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Abstract

Climate-related issues constitute an important obstacle for the development of treatment wetland (TW) applications in regions with freezing winter temperatures. The aim of the present study was to evaluate the efficiency of a new configuration of TWs based on the vertical flow (VF) configuration. The proposed TWs system is planted with a willow species (Salix miyabeana SX67) and including design adaptations for cold climate operation. Two different flow modes for winter-time operation were proposed: percolated and saturated with continuous artificial aeration. The pilot-scale systems were tested with municipal wastewater, at an organic loading ranging from 5 to 20 g CBOD5 m−2 d−1. The pilot TWs were successfully operated for 22 months despite freezing winter temperatures reaching as low as −32 °C. Willow development was normal, with evapotranspiration ranging from 19 to 23 mm/d in July 2017 for the pilot TWs at an organic loading of 10 g CBOD5 m−2 d−1. Organic matter removal efficiency was high for all pilot TWs, with an average 91% COD and 81% TSS removal. Nitrification was essentially complete during the summer period and remained high for pilot TWs operated under percolating flow mode in winter but was lower for the saturated flow mode, probably due to insufficient air supply. Our study confirms the successful application of a modified version of VF TW in regions with freezing air temperatures.

Uncontrolled Keywords

Treatment wetland; Cold climate; Willow; Artificial aeration; Percolating flow; Saturated/percolating downflow

Open Access document in PolyPublie
Subjects: 1000 Génie civil > 1000 Génie civil
1000 Génie civil > 1006 Génie hydrologique
1000 Génie civil > 1007 Ressources et approvisionnement en eau
Department: Département des génies civil, géologique et des mines
Research Center: Non applicable
Funders: CRSNG/NSERC, Consortium de recherche et d'innovation en bioprocédés industriels du Québec (CRIBIQ), Agro Énergie, NORDIKeau, Bionest, Arcelor Mittal, Naturally Wallace Consulting, SINT, Minéraux Harsco, Ressources Aquatiques Québec (RAQ)
Date Deposited: 12 Aug 2021 14:56
Last Modified: 13 Aug 2021 01:20
PolyPublie URL: https://publications.polymtl.ca/9072/
Document issued by the official publisher
Journal Title: Ecological Engineering (vol. 153)
Publisher: Elsevier
Official URL: https://doi.org/10.1016/j.ecoleng.2020.105912

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