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Macrophyte potential to treat leachate contaminated with wood preservatives: plant tolerance and bioaccumulation capacity

Emmanuelle Demers, Margit Kõiv-Vainik, Sara Yavari, Michel Mench, Lilian Marchand, Julie Vincent, Chloé Frédette, Yves Comeau, Jacques Brisson

Article (2020)

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Abstract

entachlorophenol and chromated copper arsenate (CCA) have been used worldwide as wood preservatives, but these compounds can toxify ecosystems when they leach into the soil and water. This study aimed to evaluate the capacity of four treatment wetland macrophytes, Phalaris arundinacea, Typha angustifolia, and two subspecies of Phragmites australis, to tolerate and treat leachates containing wood preservatives. The experiment was conducted using 96 plant pots in 12 tanks filled with three leachate concentrations compared to uncontaminated water. Biomass production and bioaccumulation were measured after 35 and 70 days of exposure. There were no significant effects of leachate contamination concentration on plant biomass for any species. No contaminants were detected in aboveground parts of the macrophytes, precluding their use for phytoextraction within the tested contamination levels. However, all species accumulated As and chlorinated phenols in belowground parts, and this accumulation was more prevalent under a more concentrated leachate. Up to 0.5 mg pentachlorophenol/kg (from 81 µg/L in the leachate) and 50 mg As/kg (from 330 µg/L in the leachate) were accumulated in the belowground biomass. Given their high productivity and tolerance to the contaminants, the tested macrophytes showed phytostabilization potential and could enhance the degradation of phenols from leachates contaminated with wood preservatives in treatment wetlands.

Uncontrolled Keywords

chromated copper arsenate; chlorinated phenols; phytoremediation; constructed treatment wetland; Typha angustifolia; Phalaris arundinacea; Phragmites australis

Subjects: 1000 Civil engineering > 1000 Civil engineering
1000 Civil engineering > 1006 Hydrologic engineering
1000 Civil engineering > 1007 Water resources and supply
Department: Department of Civil, Geological and Mining Engineering
Funders: Mitacs, Société Québécoise de Phytotechnologie - Scholarship, Estonian Research Council
Grant number: IT02307, PUT1125
PolyPublie URL: https://publications.polymtl.ca/9094/
Journal Title: Plants (vol. 9, no. 12)
Publisher: MDPI
DOI: 10.3390/plants9121774
Official URL: https://doi.org/10.3390/plants9121774
Date Deposited: 23 Aug 2021 10:43
Last Modified: 11 Nov 2022 13:34
Cite in APA 7: Demers, E., Kõiv-Vainik, M., Yavari, S., Mench, M., Marchand, L., Vincent, J., Frédette, C., Comeau, Y., & Brisson, J. (2020). Macrophyte potential to treat leachate contaminated with wood preservatives: plant tolerance and bioaccumulation capacity. Plants, 9(12). https://doi.org/10.3390/plants9121774

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