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Effects of oil sands process water mixtures on the mayfly Hexagenia and field-collected aquatic macroinvertebrate communities

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Abstract

Extraction of Canada’s oil sands has created 1 billion m3 of tailings, which are stored in on-site tailings ponds. Due to limited storage capacity, the planned release of tailings into the surrounding environment may be required. This represents an environmental management challenge, as the tailings contain contaminants that are known toxins to aquatic communities. Of particular concern are naphthenic acids and their metallic counterparts, as they are the principal toxic components of tailings, are relatively soluble, and are persistent in aquatic environments. This study examines the acute toxicity of environmentally relevant 10:1 mixtures of two process water components: naphthenic acid and sodium naphthenate. We assess the effects of these simplified oil sands process water (OSPW) mixtures under planned and unplanned tailings release scenarios, using traditional and cutting-edge bioindicators for aquatic invertebrate taxa. We found that safe concentrations for mayflies and other aquatic macroinvertebrates were less than 1 mg/l, as no mayfly taxa survived repeated exposure to this dose in either the 48-h or 72-h acute toxicity test. In the 72-h test, no mayflies survived treatment levels greater than 0.5 mg sodium naphthenate/l. In the mesocosm study, even a 90% dilution of the OSPW mixture was not sufficient to protect sensitive macroinvertebrate communities. The results of this study highlight the potential environmental damage that will occur if OSPW is not carefully managed. This information will aid with the development of a management plan for oil sands tailings ponds, which will provide insight into the potential for process water release into the surrounding environment while conserving unique ecosystems downstream of development in the oil sands region.

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Acknowledgements

Our thanks to Dr Donna Giberson for her insights on Hexagenia culturing. This work was supported by NSERC Discovery of ACA as well as a base funding from Environment and Climate Change Canada.

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Authors and Affiliations

  1. Biology Department, University of New Brunswick, Fredericton, NB, Canada

    J. R. Howland & A. C. Alexander

  2. Watershed Hydrology and Ecology Research Division, Environment and Climate Change Canada, Fredericton, NB, Canada

    A. C. Alexander & J. M. Culp

  3. Water S&T Branch, Environment and Climate Change Canada, Burlington, ON, Canada

    D. Milani

  4. Cold Regions Research Center, Wilfrid Laurier University, Waterloo, ON, Canada

    J. M. Culp

  5. Watershed Hydrology and Ecology Research Division, Environment and Climate Change Canada, Saskatoon, SK, Canada

    K. M. Peru

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  1. J. R. Howland
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Correspondence to J. R. Howland.

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Howland, J.R., Alexander, A.C., Milani, D. et al. Effects of oil sands process water mixtures on the mayfly Hexagenia and field-collected aquatic macroinvertebrate communities. Ecotoxicology 28, 658–668 (2019). https://doi.org/10.1007/s10646-019-02061-x

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