A novel iron-mediated nitrogen removal technology of ammonium oxidation coupled to nitrate/nitrite reduction: Recent advances.

[Display omitted] • The coupling of Feammox and NDFO is novel and cost-effective. • The comparison between this process and other denitrification technologies is summarized. • The main factors affecting the coupling process and the research of the process are analyzed. • The transformation forms of iron and nitrogen are two key issues in the coupling process. [ABSTRACT FROM AUTHOR]