Reduction of NOx in Fe-EDTA and Fe-NTA solutions by an enriched bacterial population

► An enriched biomass with Streptomyces sp., Enterobcater sp. and Citrobacter sp. was developed. ► The biomass utilized NOx & FeIIIEDTA/NTA as terminal e− acceptors simultaneously. ► Being an electron donor, ethanol concentration affected the NOx reduction rates. ► Both FeIINTA and FeIIEDTA enhanced the NOx reduction rates using the biomass. ► Higher growth and NOx reduction rates achieved in Fe-NTA media than Fe-EDTA media.