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dc.contributor.authorTan, Lea Chua
dc.contributor.authorNancharaiah, Yarlagadda V.
dc.contributor.authorLu, Shipeng
dc.contributor.authorvan Hullebusch, Eric D.
dc.contributor.authorGerlach, Robin
dc.contributor.authorLens, Piet N. L.
dc.identifier.citationTan, Lea Chua, Yarlagadda V. Nancharaiah, Shipeng Lu, Eric D. van Hullebusch, Robin Gerlach, and Piet N.L. Lens. “Biological Treatment of Selenium-Laden Wastewater Containing Nitrate and Sulfate in an Upflow Anaerobic Sludge Bed Reactor at pH 5.0.” Chemosphere 211 (November 2018): 684–693. doi:10.1016/j.chemosphere.2018.07.079.en_US
dc.description.abstractThis study investigated the removal of selenate (SeO42−), sulfate (SO42−) and nitrate (NO3−) at different influent pH values ranging from 7.0 to 5.0 and 20 °C in an upflow anaerobic sludge blanket (UASB) reactor using lactate as an electron donor. At pH 5.0, the UASB reactor showed a 20–30% decrease in reactor performance compared to operation at pH 5.5 to 7.0, reaching removal efficiencies of 79%, 15%, 43% and 61% for NO3−, SO42−, Setotal and Sediss, respectively. However, the reactor stability was an issue upon lowering the pH to 5.0 and further experiments are recommended. The sludge formed during low pH operation had a fluffy, floc-like appearance with filamentous structure, possibly due to the low polysaccharide (PS) to protein (PN) ratio (0.01 PS/PN) in the soluble extracellular polymeric substances (EPS) matrix of the biomass. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) analysis of the sludge confirmed Se oxyanion reduction and deposition of Se0 particles inside the biomass. Microbial community analysis using Illumina MiSeq sequencing revealed that the families of Campylobacteraceae and Desulfomicrobiaceae were the dominant phylotypes throughout the reactor operation at approximately 23% and 10% relative abundance, respectively. Furthermore, approximately 10% relative abundance of both Geobacteraceae and Spirochaetaceae was observed in the granular sludge during the pH 5.0 operation. Overall, this study demonstrated the feasibility of UASB operation at pH values ranging from 7.0 to 5.0 for removing Se and other oxyanions from wastewaters.en_US
dc.rightsThis Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).en_US
dc.titleBiological treatment of selenium-laden wastewater containing nitrate and sulfate in an upflow anaerobic sludge bed reactor at pH 5.0en_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.relation.collegeCollege of Engineeringen_US
mus.relation.departmentCenter for Biofilm Engineering.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.contributor.orcidLu, Shipeng|0000-0002-1817-0417en_US

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