A manganese-oxidizing bacterial consortium and its biogenic Mn oxides for dye decolorization and heavy metal adsorption

• Published in: Chemosphere (Oxford) 2020-08, Vol.253, p.126627-126627, Article 126627
• Main Authors: Wan, Wenjie, Xing, Yonghui, Qin, Xiuxiu, Li, Xiang, Liu, Song, Luo, Xuesong, Huang, Qiaoyun, Chen, Wenli
• Format: Article
• Language: English
• Subjects: Biogenic Mn oxides; Bioremediation; Dye decolorization; Manganese-oxidizing bacteria; Metal ion adsorption
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2020.126627

Manganese (Mn) contamination is a common environmental problem in the world and manganese oxidizing bacteria (MOB) play important roles in bioremediation of heavy metal and organic pollution. In this study, a novel MOB consortium AS containing core microbes of Sphingobacterium and Bacillus was acclimated from Mn-contaminated rivulet sediments. The MOB consortium AS presented good Mn(II) removal performance under 500–10,000 mg/L Mn(II), with Mn(II) removal capacities ranging from 481 to 3478 mg/L. In coexistence systems of Mn(II) and Fe(II), Ni(II), Cu(II), and Zn(II), the MOB consortium AS removed 98%, 91%, 99%, and 76% of Mn(II), respectively. Additionally, the MOB consortium AS could utilize multiple carbon sources (e.g., Chitosan, β-Cyclodextrin, and Phenanthrene) to remove Mn(II), with Mn(II) removal efficiencies ranging from 11% to 97%. Meanwhile, XRD, XPS, FTIR, SEM, and EDS analyses reflected that biogenic Mn oxides (bio-MnOx-C) contained C, O, Mn (Mn(II) and Mn(IV)) and embodied in rhodochrosite and birnessite. The bio-MnOx-C exhibited second-order kinetic reaction for removal of dye, with corresponding decolorization capacities of 22.0 mg/g for methylene blue and 23.8 mg/g for crystal violet. In addition, bio-MnOx-C showed adsorption capacities of 159.0 mg/g for Cu(II), 130.7 mg/g for Zn(II), and 123.3 mg/g for Pb(II). Overall, this study illustrates consortium AS and bio-MnOx-C have great potentials in remediation of pollution caused by heavy metals and organic pollutants. [Display omitted] •An efficient Mn(II)-removal rivulet sediment microbial community was obtained.•High throughput sequencing signified new Mn(II) oxidation associated genus.•MOB Consortium presented Mn(II) removal performance over various harsh conditions.•Rhodochrosite and birnessite were found in bio-MnOx-C.•Bio-MnOx-C showed good performance for dye decolorization and heavy metal adsorption.