Manganese removal and product characteristics of a marine manganese-oxidizing bacterium Bacillus sp. FF-1

• Jinhao Wu ^[2] ; Fan Kang ^[1] ; Zhongkuan Wang ^[1] ; Lun Song ^[2] ; Xiaoyan Guan ^[2] ; Hao Zhou ^[1]
  1. [1] Dalian University of Technology

     Dalian University of Technology

     China

     
  2. [2] Liaoning Ocean and Fisheries Science Research Institute
• Localización: International microbiology: official journal of the Spanish Society for Microbiology, ISSN 1139-6709, Vol. 25, Nº. 4, 2022, págs. 701-708
• Idioma: inglés
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• Resumen

  • Biogenic manganese oxides (BioMnOx) have been found all over the world, and most of them were formed by Mn(II)-oxidizing bacteria (MnOB). In this study, a MnOB designated as FF-1 was isolated from marine surface sediments in the Bohai Sea, China. This strain was identified as Bacillus sp. and can tolerate more than 5% salinity. It can grow in the presence of 0–7 mM Mn(II) and pH range from 5.0 to 7.0. When the initial Mn(II) was 5 mM, the percentage of Mn(II) oxidation reached the highest value of 16% after 10 days of incubation. The initial pH (5.0 to 7.0) affected the percentage of Mn(II) oxidation, but the ability of the strain FF-1 to self-regulate pH resulted in the final pH being almost 7.6. The removal of Mn(II) by the strain FF-1 involves extracellular and intracellular adsorption as well as Mn(II) oxidation. Intracellular Mn adsorption contributed a small part to the total Mn removal, and extracellular adsorption was dominant in the initial stage of Mn removal. The solid products after Mn removal were a mixture of MnOx and MnCO3. The layered MnOx formed in the extracellular space could be easily collected and used for adsorption and oxidation of pollutants.