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In this study, the contribution of substrates microorganisms in three different constructed wetlands (CWs) to Cr(VI) purification was discussed. In addition, the microbial communities in the substrate of different CWs were characterized, and rhizosphere Cr(VI) reducing bacteria was also identified. The results showed that microorganisms could improved Cr(VI) removal to 76.5%, and result in that more Cr(VI) was reduced to Cr(III). The dominant strains in the substrates of different CWs were  Sphingomonas  sp.,  Cystobacter  sp.,  Acidobacteria bacterium ,  Sporotrichum  and  Pellicularia species . The Cr(VI) reducing bacteria from  Leersia hexandra Swartz  rhizosphere was identified as  Bacillus cereus . Furthermore, under suitable conditions, the removal rate of Cr(VI) by  Bacillus cereus  was close to 100%.

scientific reports

Characterization of Microbial Communities, Identification of Cr(VI) Reducing Bacteria in Constructed Wetland and Cr(VI) Removal Ability of Bacillus cereus