Xavier Lachapelle-Trouillard, Michel Labrecque and Yves Comeau
Article (2019)
Open Access document in PolyPublie |
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Abstract
The objective of this study was to evaluate the treatment efficiency of a short rotation willow coppice (SRWC) vegetation filter for the treatment of wastewater from a municipal primary effluent in a humid continental climate context. The experimental work was carried out at pilot scale on a willow plantation located in Québec, Canada. The experimental design included nine plots that were irrigated with groundwater (L0 = 14 mm/d) or two primary effluents (L1 = 10 and L2 = 16 mm/d) for 111 days. This research showed that SRWCs operated on coarse-textured soils allow efficient removal of organic matter (91% of COD for L1 and L2) and nitrogen (98% of TKN for L1 and L2) from wastewater. It was also shown, in this case, that the total nitrogen loading should be used as the limiting design parameter to minimize the risk of contaminating underground drinking water sources with nitrates. Almost complete removal of total phosphorus was observed during this experiment (98% for L1 and L2). However, a significant increase in soil available phosphorus was observed following the L2 treatment, which suggests an eventual phosphorus soil profile saturation in the event of continued wastewater irrigation. Avoiding such a saturation would require chemical phosphorus removal upstream of SRWC vegetation filters. Finally, an imbalance between irrigation and willows needs was observed as a result of irrigating plots at a constant hydraulic loading rate. Thus, irrigation of an SRWC with wastewater should be modulated according to willow seasonal transpiration trends to allow a better allocation of water and nutrients according to plant needs, and in doing so, increase treatment efficiency and resources valorization.
Uncontrolled Keywords
Willow; Short rotation coppice; Vegetation filter; Municipal wastewater; Wastewater treatment; Resource recovery
Subjects: |
1000 Civil engineering > 1000 Civil engineering 1000 Civil engineering > 1006 Hydrologic engineering 1000 Civil engineering > 1007 Water resources and supply |
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Department: | Department of Civil, Geological and Mining Engineering |
Funders: | CRSNG/NSERC, Consortium de recherche et d'innovation en bioprocédés industriels au Québec (CRIBIQ), Agro Énergie, Bionest, Arcelor Mittal Produits Longs Canada, Minéraux Harsco |
PolyPublie URL: | https://publications.polymtl.ca/9081/ |
Journal Title: | Ecological Engineering (vol. 130) |
Publisher: | Elsevier |
DOI: | 10.1016/j.ecoleng.2019.02.003 |
Official URL: | https://doi.org/10.1016/j.ecoleng.2019.02.003 |
Date Deposited: | 12 Aug 2021 15:23 |
Last Modified: | 28 Sep 2024 01:16 |
Cite in APA 7: | Lachapelle-Trouillard, X., Labrecque, M., & Comeau, Y. (2019). Treatment and valorization of a primary municipal wastewater by a short rotation willow coppice vegetation filter. Ecological Engineering, 130, 32-44. https://doi.org/10.1016/j.ecoleng.2019.02.003 |
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