Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China.
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin, China.
Sci Rep. 2019 Sep 6;9(1):12873. doi: 10.1038/s41598-019-49333-4.
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%.
本研究探讨了三种不同构造湿地（CWs）中基质微生物对 Cr(VI) 净化的贡献。此外，还对不同 CWs 基质中的微生物群落进行了表征，并鉴定了根际 Cr(VI)还原菌。结果表明，微生物可将 Cr(VI)去除率提高到 76.5%，并导致更多的 Cr(VI)被还原为 Cr(III)。不同 CWs 基质中的优势菌分别为鞘氨醇单胞菌、粘细菌、酸杆菌、节丛孢菌和皮壳菌属。来自旱禾的根际 Cr(VI)还原菌被鉴定为蜡样芽胞杆菌。此外，在适宜条件下，蜡样芽胞杆菌对 Cr(VI)的去除率接近 100%。
