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Thermal properties of treatment wetlands operated under freezing conditions

Zhanna Grebenshchykova, Nicolas Forquet, Jacques Brisson, Xavier Lachapelle-T, Yves Comeau and Florent Chazarenc

Article (2023)

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Abstract

The use of treatment wetlands (TWs) presents particular challenges in regions with sub-zero winter temperatures, due to reduced biological activity and risk of pipe breakage or clogging due to freezing. We studied the vertical temperature distribution in four pilot-scale TWs exposed to winter temperatures in order to determine the impact of operational system parameters and the role of insulation on heat conservation inside the filtering bed. The overall temperature pattern was similar in all wetlands, with a trend of increasing temperature from the surface toward the bottom during the cold season. No freezing was detected in the wetlands despite average daily temperatures as low as −20 °C. Influent water temperature and hydraulic loading had a stronger influence on TW temperatures in winter than air temperature. The vertical distribution of temperatures in TWs is more sensitive to hydraulic loading variation in the percolating operating condition than in the saturated flow with forced aeration configuration. Our results suggest that TW systems can remain operational under cold winter conditions provided the surface is properly insulated by vegetation, mulch and/or snow.

Uncontrolled Keywords

cold climate; insulation; thermal distribution; treatment wetland; vertical flow

Department: Department of Civil, Geological and Mining Engineering
Funders: Ramo, Bionest, Arcelor Mittal, Minéraux Harsco, Équipe Indigo, Ressources Aquatiques Québec, CRSNG/NSERC, Consortium de recherche et d’innovation en bioprocédés industriels du Québec (CRIBIQ)
PolyPublie URL: https://publications.polymtl.ca/56389/
Journal Title: Water Science and Technology (vol. 88, no. 8)
Publisher: International Water Association
DOI: 10.2166/wst.2023.320
Official URL: https://doi.org/10.2166/wst.2023.320
Date Deposited: 02 Nov 2023 15:35
Last Modified: 09 Apr 2024 05:33
Cite in APA 7: Grebenshchykova, Z., Forquet, N., Brisson, J., Lachapelle-T, X., Comeau, Y., & Chazarenc, F. (2023). Thermal properties of treatment wetlands operated under freezing conditions. Water Science and Technology, 88(8), 2054-2067. https://doi.org/10.2166/wst.2023.320

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