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In this study, a lab-scale expanded granular sludge bed reactor was continuously operated to treat high-nitrate wastewater containing different concentrations of hexavalent chromium (Cr(VI)). Nearly complete nitrate removal was achieved even at 120 mg/L influent Cr(VI). Pyrosequencing of 16S rRNA gene showed that Cr(VI) decreased the biodiversity of the bacterial community and potential denitrifiers...
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