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Minerals 2016, 6(2), 36; doi:10.3390/min6020036

Seasonal Microbial Population Shifts in a Bioremediation System Treating Metal and Sulfate-Rich Seepage

1
Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, BC V6T 1Z3, Canada
2
NatureWorks Remediation Corporation, Rossland, BC VOG 1YO, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Karen Hudson-Edwards
Received: 1 February 2016 / Revised: 1 April 2016 / Accepted: 1 April 2016 / Published: 12 April 2016
(This article belongs to the Special Issue Biotechnologies and Mining)
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Abstract

Biochemical reactors (BCRs) using complex organics for bioremediation of mine-influenced water must operate successfully year round. In cold climates, where many mines in Canada are located, survival of the important microorganisms through the winter months is a concern. In this work, broad phylogenetic surveys, using metagenomics, of the microbial populations in pulp mill biosolids used to remediate metal leachate containing As, Zn, Cd and sulfate were performed to see if the types of microorganisms present changed over the seasons of one year (August 2008 to July 2009). Despite temperature variations between 0 and 17 °C the overall structure of the microbial population was fairly consistent. A cyclical pattern in relative abundance was detected in certain taxa. These included fermenter-related groups, which were out of phase with other taxa such as Desulfobulbus that represented potential consumers of fermentation byproducts. Sulfate-reducers in the BCR biosolids were closely related to psychrotolerant species. Temperature was not a factor that shaped the microbial population structure within the BCR biosolids. Kinetics of organic matter degradation by these microbes and the rate of supply of organic carbon to sulfate-reducers would likely affect the metal removal rates at different temperatures. View Full-Text
Keywords: biochemical reactors; BCR; metals; mine-influenced water; microbial ecology; metagenomics; sulfate-reducing bacteria biochemical reactors; BCR; metals; mine-influenced water; microbial ecology; metagenomics; sulfate-reducing bacteria
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Baldwin, S.A.; Mattes, A.; Rezadehbashi, M.; Taylor, J. Seasonal Microbial Population Shifts in a Bioremediation System Treating Metal and Sulfate-Rich Seepage. Minerals 2016, 6, 36.

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