title: Investigating the nitrification and denitrification kinetics under aerobic and anaerobic conditions by Paracoccus denitrificans ISTOD1.
abstract: Municipal wastewater contains multiple nitrogen contaminants such as ammonia, nitrate and nitrite. Two heterotrophic nitrifier and aerobic denitrifiers, bacterial isolates ISTOD1 and ISTVD1 were isolated from domestic wastewater. On the basis of removal efficiency of ammonia, nitrate and nitrite under both aerobic and anaerobic conditions, ISTOD1 was selected and identified as Paracoccus denitrificans. Aerobically, NH4+-N had maximum specific nitrogen removal rate (Rxi) of 7.6g/gDCW/h and anaerobically, NO3-N showed Rxiof 2.5*10-1g/g DCW/h. Monod equation described the bioprocess kinetic coefficients, µmaxand Ks, obtained by regression. Error functions were calculated to validate the Monod equation experimental data. Aerobic NO3-N showed the highest YWof 0.372mg DCW/mg NO3-N among the five conditions. ISTOD1 serves as a potential candidate for treating nitrogen rich wastewater using simultaneous nitrification and aerobic denitrification. It can be used in bioaugmentation studies under varied condition.
authors.affiliation: Jawaharlal Nehru University, New Delhi, India.
authors.forename: Kristina
authors.initials: K
authors.lastname: Medhi
authors.affiliation: University of Allahabad, Allahabad, India.
authors.forename: Anjali
authors.initials: A
authors.lastname: Singhal
authors.affiliation: University of Allahabad, Allahabad, India.
authors.forename: D K
authors.initials: DK
authors.lastname: Chauhan
authors.affiliation: Jawaharlal Nehru University, New Delhi, India. Electronic address: isthakur@hotmail.com.
authors.forename: Indu Shekhar
authors.initials: IS
authors.lastname: Thakur
mesh_terms: D058440:Denitrification; D052836:Heterotrophic Processes; D007700:Kinetics; D058465:Nitrification; D009584:Nitrogen; D010231:Paracoccus denitrificans
chemical_list: D009584:Nitrogen
keywords: Denitrification; Error functions; Monod equation; Nitrification; Yield coefficient