As(III) oxidation and Cr(VI) reduction insight in an indigenous mixed culture of anaerobic bacteria from a local environment

dc.contributor.authorIgboamalu, Tony Ebuka
dc.contributor.authorChirwa, Evans M.N.
dc.contributor.emailevans.chirwa@up.ac.zaen_ZA
dc.date.accessioned2018-01-26T11:13:14Z
dc.date.available2018-01-26T11:13:14Z
dc.date.issued2017
dc.description.abstractTransition metal and metalloid oxyanions such as Cr-compound (CrO4-2) and As-compound (H3AsO3) are common pollutants routinely detected in effluent waste streams from the mining industry around the world. Biological treatment strategies commonly applied for a specific metallic pollutant may not be successful due to a dual toxic effect imposed by the metallic component. In the current study, Cr(VI) reduction linked to As(III) oxidation was observed in a mixed culture of anaerobic bacteria isolated from cow dip in Tzaneen (Limpopo Province), and activated sludge from Brits Wastewater Treatment Works (NW Province), both in South Africa. The cultures were acclimatized for 264 h, and utilized bicarbonate as a carbon source. In an experiment containing 30 to100 mg/L of Cr(VI) at a constant 120 mg/L As(III) concentrations, near complete Cr (VI) reduction at initial concentrations from 30 to70 mg/L was observed Lower removal efficiency was seen when Cr(VI) concentration was increased to 100 mg/L. In a different experiment, As(III) concentrations ranging from 50 to 400 mg/L at a constant 70 mg/L Cr(VI) concentrations was also investigated. Results show that Cr(VI) removal efficiency increases as As(III) concentration was increased from 150 to 400 mg/L. Low Cr(VI) removal rate was seen as As(III) concentration decreased from100 to 50 mg/L. These experiments suggest that Cr(VI) reduction in the presence of As(III) was not inhibited at higher As(III) concentration, rather As(III) enhanced the redox process by acting as inorganic electron donor for Cr(VI) reduction. Abiotic control shows no insignificant reduction in Cr(VI) or oxidation of As(III) in the absence of these isolates.en_ZA
dc.description.departmentChemical Engineeringen_ZA
dc.description.librarianam2018en_ZA
dc.description.urihttp://www.aidic.it/ceten_ZA
dc.identifier.citationIgboamalu, T.E. & Chirwa, E.M.N. 2017, 'As(III) oxidation and Cr(VI) reduction insight in an indigenous mixed culture of anaerobic bacteria from a local environment', Chemical Engineering Transactions, vol. 61, pp. 259-264.en_ZA
dc.identifier.issn2283-9216 (online)
dc.identifier.other978-88-95608-51-8
dc.identifier.urihttp://hdl.handle.net/2263/63766
dc.language.isoenen_ZA
dc.publisherThe Italian Association of Chemical Engineeringen_ZA
dc.rights© 2017, AIDIC Servizi S.r.l.en_ZA
dc.subjectChromium compoundsen_ZA
dc.subjectWastewater treatment work (WWTW)en_ZA
dc.subjectRemoval efficienciesen_ZA
dc.subjectMetallic pollutantsen_ZA
dc.subjectMetallic componenten_ZA
dc.subjectLocal environmentsen_ZA
dc.subjectInitial concentrationen_ZA
dc.subjectBiological treatmenten_ZA
dc.subjectAnaerobic bacteriumen_ZA
dc.subjectTransition metalsen_ZA
dc.subjectRiver pollutionen_ZA
dc.subjectPollutionen_ZA
dc.subjectOxidationen_ZA
dc.subjectMetalsen_ZA
dc.subjectEffluentsen_ZA
dc.subjectEfficiencyen_ZA
dc.subjectCarbonen_ZA
dc.subjectBacteriaen_ZA
dc.subjectActivated sludge processen_ZA
dc.titleAs(III) oxidation and Cr(VI) reduction insight in an indigenous mixed culture of anaerobic bacteria from a local environmenten_ZA
dc.typeArticleen_ZA

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