Cadmium immobilization during nitrate-reducing Fe(II) oxidation by Acidovorax sp. BoFeN1: Contribution of bacterial cells and secondary minerals

Fe(II) Oxidation Shaped Functional Genes and Bacteria Involved in Denitrification and Dissimilatory Nitrate Reduction to Ammonium from Different Paddy Soils

“…Previous studies together with this study confirm that chemodenitrification mainly drives Fe­(II) oxidation once nitrite is produced by nitrate-reducing bacteria under heterotrophic conditions. It has been reported that the secondary minerals formed after nitrate-reducing Fe­(II) oxidation play a predominant role in carbon and nitrogen sequestration as well as heavy metal immobilization, e.g., arsenic, cadmium, and nickel. ,− The enriched nitrate-reducing bacteria, i.e., Dechloromonas, Pseudogulbenkiania, Azospira, and Pseudomonas, are widely distributed in the environments. ,, Given that these bacteria show high adaptability and activity during Fe­(II) oxidation, it deserves further investigation on whether they could be stimulated in situ or used as microbial agents to facilitate nitrate-reducing Fe­(II) oxidation and the formation of secondary minerals in an anoxic environment, resulting in promoted carbon/nitrogen sequestration and heavy metal remediation.…”