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Treatment of a mixed wood preservative leachate by a hybrid constructed wetland and a willow planted filter

Sophie Lévesque, Emmanuelle Demers, Jacques Brisson and Yves Comeau

Article (2017)

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Cite this document: Lévesque, S., Demers, E., Brisson, J. & Comeau, Y. (2017). Treatment of a mixed wood preservative leachate by a hybrid constructed wetland and a willow planted filter. Water Science and Technology, 76(1), p. 164-171. doi:10.2166/wst.2017.197
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The performance and removal mechanisms of a hybrid constructed wetland (HCW) followed by a willow planted filter (WPF) were evaluated for the treatment of a leachate contaminated by wood pole preservatives (pentachlorophenol (PCP) and chromated copper arsenate) to reach the storm sewer discharge limits. The HCW aimed to dechlorinate the PCP and polychlorodibenzo-p-dioxins/polychlorodibenzofuran (PCDD/F) and to remove metals by adsorption and precipitation. The HCW was efficient in removing PCP (>98.6%), oil, arsenic (99.4%), chromium (>99.2%), copper (>99.6%%) and iron (29%) to under their discharge limits, but it was unable to reach those of Mn and PCDD/F, with residual concentrations of 0.11 mg Mn/L and 0.32 pg TEQ/L. Iron and manganese could be removed but were subsequently released by the HCW due to low redox conditions. No dechlorination of PCDD/F was observed since its chlorination profile remained the same in the different sections of the HCW. Adsorption was the most probable removal mechanism of PCDD/F. The WPF was able to remove some residual contamination, but it released Mn at a gradually decreasing rate. Total evapotranspiration of the leachate by a larger fertilized WPF and the construction of an underground retention basin are proposed to prevent any discharge of PCDD/F traces in the environment.

Uncontrolled Keywords

adsorption, constructed wetland, dechlorination, evapotranspiration, PCDD/F, willow filter

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
Date Deposited: 14 Jan 2022 15:40
Last Modified: 15 Jan 2022 01:20
PolyPublie URL: https://publications.polymtl.ca/9985/
Document issued by the official publisher
Journal Title: Water Science and Technology (vol. 76, no. 1)
Publisher: IWA Publishing
Official URL: https://doi.org/10.2166/wst.2017.197


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