Acclimation of a marine microbial consortium for efficient Mn(II) oxidation and manganese containing particle production

•An efficient Mn(II) oxidation marine sediments microbial community was obtained.•High-throughput sequencing indicated new Mn(II) oxidation associated genus.•Na3MnPO4CO3 and MnCO3 were synthesized by the consortium.•Consortium exhibited Mn(II) oxidation performance over a range of harsh conditions. Sediment contamination with metals is a widespread concern in the marine environment. Manganese oxidizing bacteria (MOB) are extensively distributed in various environments, but a marine microbial community containing MOB is rarely reported. In this study, a consortium of marine metal-contaminated sediments was acclimated using Mn(II). The shift in community structure was determined through high-throughput sequencing. In addition, the consortium resisted several harsh conditions, such as toxic metals (1mM Cu(II) and Fe(III)), and exhibited high Mn(II) oxidation capacities even the Mn(II) concentration was up to 5mM. Meanwhile, biogenic Mn containing particles were characterized by scanning electron microscope (SEM), X-ray powder diffraction (XRD), and N2 adsorption/desorption. Dye removal performance of the Mn containing particles was assayed using methylene blue, and 20.8mgg−1 adsorption capacity was obtained. Overall, this study revealed several new genera associated with Mn(II) oxidation and rare biogenic Na3MnPO4CO3. Results suggested the complexity of natural microbe-mediated Mn transformation.