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Alum addition triggers hypoxia in an engineered pit lake

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dc.contributor.authorJessen, Gerdhard L.
dc.contributor.authorChen, Lin-Xing
dc.contributor.authorMori, Jiro F.
dc.contributor.authorColenbrander Nelson, Tara E.
dc.contributor.authorSlater, Gregory F.
dc.contributor.authorLindsay, Matthew B. J.
dc.contributor.authorBanfield, Jillian F.
dc.contributor.authorWarren, Lesley A.
dc.date.accessioned2022-09-27T19:08:18Z
dc.date.available2022-09-27T19:08:18Z
dc.date.issued2022-02-26
dc.description© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).en_US
dc.description.abstractHere, we examine the geobiological response to a whole-lake alum (aluminum sulfate) treatment (2016) of Base Mine Lake (BML), the first pilot-scale pit lake established in the Alberta oil sands region. The rationale for trialing this management amendment was based on its successful use to reduce internal phosphorus loading to eutrophying lakes. Modest increases in water cap epilimnetic oxygen concentrations, associated with increased Secchi depths and chlorophyll-a concentrations, were co-incident with anoxic waters immediately above the fluid fine tailings (FFT) layer post alum. Decreased water cap nitrate and detectable sulfide concentrations, as well as increased hypolimnetic phospholipid fatty acid abundances, signaled greater anaerobic heterotrophic activity. Shifts in microbial community to groups associated with greater organic carbon degradation (i.e., SAR11-LD12 subclade) and the SRB group Desulfuromonodales emerged post alum and the loss of specialist groups associated with carbon-limited, ammonia-rich restricted niches (i.e., MBAE14) also occurred. Alum treatment resulted in additional oxygen consumption associated with increased autochthonous carbon production, watercap anoxia and sulfide generation, which further exacerbate oxygen consumption associated with on-going FFT mobilized reductants. The results illustrate the importance of understanding the broader biogeochemical implications of adaptive management interventions to avoid unanticipated outcomes that pose greater risks and improve tailings reclamation for oil sands operations and, more broadly, the global mining sector.en_US
dc.description.sponsorshipNSERC (CRDPJ 488301-15), COSIA, The National Fund for Scientific and Technological Development of Chile (FONDECYT) Grant 11191138 (The National Research and Development Agency of Chile, ANID Chile), FONDECYT Grant 1200252 (ANID Chile) and COPAS COASTAL ANID FB210021 to G.L.J.en_US
dc.description.versionPeer Revieweden_US
dc.identifier.citationJessen, G.L., Chen, L.-X., Mori, J. F., Colenbrander Nelson, T. E., Slater, G. F., Lindsay, M. B. J., Banfield, J. F. & Warren, L. A. (2022). Alum addition triggers hypoxia in an engineered pit lake. Microorganisms (Basel), 10(3), 510. https://doi.org/10.3390/microorganisms10030510en_US
dc.identifier.doi10.3390/microorganisms10030510
dc.identifier.urihttps://hdl.handle.net/10388/14232
dc.language.isoenen_US
dc.publisherMDPIen_US
dc.subjectpit lakesen_US
dc.subjectoil sandsen_US
dc.subjecttailing reclamationen_US
dc.subjecthydrocarbon miningen_US
dc.subjectecological successionen_US
dc.subjectaquatic microbiologyen_US
dc.titleAlum addition triggers hypoxia in an engineered pit lakeen_US
dc.typeArticleen_US

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