Characterisation of heterotrophic nitrifying and aerobic denitrifying Klebsiella pneumoniae CF-S9 strain for bioremediation of wastewater

► We have isolated one strain of Klebsiella pneumonia from domestic sewage water. ► The strain possesses simultaneous nitrification and denitrification properties. ► Hydroxylamine oxidase, periplasmic nitrate and nitrite reductases are assayed. ► Both hydroxylamine oxidase and periplasmic nitrate reductase genes are amplified. ► The strain secretes extracellular polymeric substance and shows auto-aggregation.