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dc.contributor.authorLu, Jen
dc.contributor.authorZhang, Ben
dc.contributor.authorHe, Cen
dc.contributor.authorBorthwick, AGLen
dc.date.accessioned2021-08-22T11:49:43Z
dc.date.issued2020-05-05en
dc.identifier.urihttp://hdl.handle.net/10026.1/17662
dc.description.abstract

To date, comparatively little is known about the role of natural Fe(II)-bearing minerals in bioremediation of chromium (VI) contaminated aquifers subject to chemoautotrophic conditions. This work employed four kinds of Fe(II)-bearing minerals (pyrite, mackinawite, wustite, and magnetite) as inorganic electron donors to support Cr(VI) bio-reduction. In batch experiments, mackinawite (FeS) performed best, with Cr(VI) removal efficiency of 98.1 ± 1.21 % in 96 h. Continuous column experiments lasting 180 d implied that groundwater chemistry and hydrodynamics influenced the Cr(VI) removal process. A breakthrough study suggested that biotic and abiotic contributions to Cr(VI) reduction were 76.0 ± 1.12 % and 24.1 ± 1.43 %, respectively. Cr(VI) was reduced to insoluble Cr(III), whereas Fe(II) and S(-II) in mackinawite were finally oxidized to Fe(III) and sulfate. Mackinawite evolved progressively into pyrrhotite. High-throughput 16S rRNA gene sequencing indicated that mackinawite-driven Cr(VI) reduction was mediated through synergistic interactions of microbial consortia; i.e. autotrophs as Acidovorax synthesized volatile fatty acids as metabolic intermediates, which were consumed by Cr(VI) reducers as Geobacter. Genes encoding enzymes for S oxidation (soxB) and Cr(VI) reduction (chrA, yieF) were upregulated. Cytochrome c participating in Fe(II) oxidation increased significantly. This work advances the development of sustainable techniques for Cr(VI) polluted groundwater remediation.

en
dc.format.extent121911 - ?en
dc.languageengen
dc.language.isoengen
dc.subjectBio-reductionen
dc.subjectChromium (VI)en
dc.subjectFe(II)-bearing mineralsen
dc.subjectMackinawiteen
dc.subjectBacteriaen
dc.subjectBiodegradation, Environmentalen
dc.subjectChromiumen
dc.subjectFerrous Compoundsen
dc.subjectGroundwateren
dc.subjectMineralsen
dc.subjectModels, Chemicalen
dc.subjectOxidation-Reductionen
dc.subjectWater Pollutants, Chemicalen
dc.titleThe role of natural Fe(II)-bearing minerals in chemoautotrophic chromium (VI) bio-reduction in groundwater.en
dc.typeJournal Article
plymouth.author-urlhttps://www.ncbi.nlm.nih.gov/pubmed/31879105en
plymouth.volume389en
plymouth.publication-statusPublisheden
plymouth.journalJ Hazard Materen
dc.identifier.doi10.1016/j.jhazmat.2019.121911en
plymouth.organisational-group/Plymouth
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering/School of Engineering, Computing and Mathematics
plymouth.organisational-group/Plymouth/Users by role
plymouth.organisational-group/Plymouth/Users by role/Academics
dc.publisher.placeNetherlandsen
dcterms.dateAccepted2019-12-15en
dc.rights.embargodate9999-12-31
dc.identifier.eissn1873-3336en
dc.rights.embargoperiodNot knownen
rioxxterms.versionofrecord10.1016/j.jhazmat.2019.121911en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2020-05-05en
rioxxterms.typeJournal Article/Reviewen


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