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dc.contributor.authorLiu, Peng
dc.contributor.authorPtacek, Carol J.
dc.contributor.authorBlowes, David W.
dc.contributor.authorGould, W. Douglas
dc.date.accessioned2018-11-14 16:43:27 (GMT)
dc.date.available2018-11-14 16:43:27 (GMT)
dc.date.issued2018-05-01
dc.identifier.urihttps://dx.doi.org/10.1016/j.apgeochem.2018.02.004
dc.identifier.urihttp://hdl.handle.net/10012/14122
dc.descriptionThe final publication is available at Elsevier via https://dx.doi.org/10.1016/j.apgeochem.2018.02.004 © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.description.abstractThe effectiveness of activated carbon and four types of biochar, switchgrass (300 °C and 600 °C), poultry manure (600 °C), and oak (∼700 °C) with respect to mercury (Hg) and methylmercury (MeHg) control was assessed in microcosm experiments carried out for 524 d. Early in the study (<30 d), minimal differences in concentrations of <0.45-μm filtered total Hg (THg) in control and 5% biochar-amended systems were observed. At later stages, THg concentrations in the amended systems decreased to 8–80% of concentrations in the sediment controls. Aqueous concentrations of MeHg were generally lower in the amended systems than in the controls, with an initial peak in MeHg concentration corresponding to the onset of iron and sulfate reduction (∼40 d) and a second peak to methanogenic conditions (∼400 d). Pyrosequencing analyses indicate the microbial communities initially associated with fermenters and later shifted to iron-reducing bacteria (FeRB), sulfate-reducing bacteria (SRB), and methanogens. These analyses also indicate the existence of 12 organisms associated with Hg methylation in all systems. Community shifts were correlated with changes in the concentrations of carbon sources (dissolved organic carbon (DOC) and organic acids) and electron acceptors (NO3−, Fe, and SO42−). Co-blending of biochars with Hg-contaminated sediment can be an alternative remediation method for controlling the release of Hg and MeHg, but the potential for Hg methylation under some conditions requires consideration.en
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canadaen
dc.description.sponsorshipCanada Research Chairsen
dc.description.sponsorshipE. I. du Pont de Nemours and Companyen
dc.language.isoenen
dc.publisherElsevieren
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectGeochemistryen
dc.subjectMercuryen
dc.subjectSedimenten
dc.subjectBiocharen
dc.subjectMethylmercuryen
dc.subjectRemediationen
dc.titleControl of mercury and methylmercury in contaminated sediments using biochars: A long-term microcosm studyen
dc.typeArticleen
dcterms.bibliographicCitationLiu, P., Ptacek, C. J., Blowes, D. W., & Gould, W. D. (2018). Control of mercury and methylmercury in contaminated sediments using biochars: A long-term microcosm study. Applied Geochemistry, 92, 30–44. doi:10.1016/j.apgeochem.2018.02.004en
uws.contributor.affiliation1Faculty of Scienceen
uws.contributor.affiliation2Earth and Environmental Sciencesen
uws.typeOfResourceTexten
uws.typeOfResourceTexten
uws.peerReviewStatusRevieweden
uws.scholarLevelFacultyen


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