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Optimization of the wastewater treatment capacity of a short rotation willow coppice vegetation filter

Simon Amiot, Ahmed Jerbi, Xavier Lachapelle-Trouillard, Chloé Frédette, Michel Labrecque and Yves Comeau

Article (2020)

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Abstract

The objective of this study was to determine the conditions to optimize the wastewater treatment efficiency of a short rotation willow coppice (SRWC) plantation (Salix miyabeana ‘SX67') used as a vegetation filter to treat small municipal primary effluents (with less than 800 population equivalent). With the aim of maximizing the annual amount of wastewater treated, the effect of adjusting the hydraulic loading rate (HLR) according to the estimated evapotranspiration was tested at demonstration scale under humid continental climate conditions. We proposed a new method to calculate the evapotranspiration rate from plant physiological data, introducing an α factor based on direct transpiration measurements. This method increased the accuracy of the water balance, with a prediction of the crop coefficient (kc) based on either an seasonal approach (R2 of 0.88) or a monthly approach (R2 of 0.94). This led to a more precise estimation of the pollutant loading reaching the groundwater and could be used after plantation establishment as a fine-tuning tool. Adjusting the HLR to that of evapotranspiration between May and October led to an annual increase of 2 mm/d (around 0.35 m3/m2 per growing season) in HLR, while maintaining a pollutant loading removal efficiency of at least 96% for organic matter, 99% for total phosphorus and 93% for total nitrogen. A high HLR at the end of the season caused nitrogen leaching into groundwater, indicating that the HLR should be decreased in October, when willow growth is greatly reduced.

Uncontrolled Keywords

Wastewater treatment; Municipal wastewater; Evapotranspiration; Willow; Short rotation coppice; Vegetation filter

Subjects: 1000 Civil engineering > 1006 Hydrologic engineering
1000 Civil engineering > 1007 Water resources and supply
Department: Department of Civil, Geological and Mining Engineering
Funders: Natural Sciences and Engineering Research Council - Alexander Graham Bell Canada Graduate Scholarships - Master's, Fonds de Recherche Nature et Technologies - Master research scholarships, Ramea phytotechnologies, Consortium de recherche et d'innovation en bioprocédés industriels du Québec, Bionest, ArcelorMittal Produits Longs Canada, Harsco Minerals
PolyPublie URL: https://publications.polymtl.ca/9071/
Journal Title: Ecological Engineering (vol. 158)
Publisher: Elsevier
DOI: 10.1016/j.ecoleng.2020.106013
Official URL: https://doi.org/10.1016/j.ecoleng.2020.106013
Date Deposited: 12 Aug 2021 14:39
Last Modified: 06 Apr 2024 13:11
Cite in APA 7: Amiot, S., Jerbi, A., Lachapelle-Trouillard, X., Frédette, C., Labrecque, M., & Comeau, Y. (2020). Optimization of the wastewater treatment capacity of a short rotation willow coppice vegetation filter. Ecological Engineering, 158. https://doi.org/10.1016/j.ecoleng.2020.106013

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