title: The kinetics for ammonium and nitrite oxidation under the effect of hydroxylamine.
abstract: The kinetics for ammonium (NH4(+)) oxidation and nitrite (NO2(-)) oxidation under the effect of hydroxylamine (NH2OH) were studied by respirometry using the nitrifying sludge from a laboratory-scale sequencing batch reactor. Modified models were used to estimate kinetics parameters of ammonia and nitrite oxidation under the effect of hydroxylamine. An inhibition effect of hydroxylamine on the ammonia oxidation was observed under different hydroxylamine concentration levels. The self-inhibition coefficient of hydroxylamine oxidation and noncompetitive inhibition coefficient of hydroxylamine for nitrite oxidation was estimated by simulating exogenous oxygen-uptake rate profiles, respectively. The inhibitive effect of NH2OH on nitrite-oxidizing bacteria was stronger than on ammonia-oxidizing bacteria. This work could provide fundamental data for the kinetic investigation of the nitrification process.
authors.affiliation: Department of Environmental Science, Chongqing University, Chongqing 400030, China E-mail: dzhang@cqu.edu.cn.
authors.forename: Xinyu
authors.initials: X
authors.lastname: Wan
authors.affiliation: Department of Environmental Science, Chongqing University, Chongqing 400030, China E-mail: dzhang@cqu.edu.cn; School of Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China.
authors.forename: Pengying
authors.initials: P
authors.lastname: Xiao
authors.affiliation: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China; Department of Environmental Science, Chongqing University, Chongqing 400030, China E-mail: dzhang@cqu.edu.cn.
authors.forename: Daijun
authors.initials: D
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China; Department of Environmental Science, Chongqing University, Chongqing 400030, China E-mail: dzhang@cqu.edu.cn.
authors.forename: Peili
authors.initials: P
authors.lastname: Lu
authors.affiliation: Department of Environmental Science, Chongqing University, Chongqing 400030, China E-mail: dzhang@cqu.edu.cn.
authors.forename: Zongbao
authors.initials: Z
authors.lastname: Yao
authors.affiliation: Key Laboratory of Three Gorges Reservoir Region's Eco-environment, Ministry of Education, Chongqing University, Chongqing 400030, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: He
mesh_terms: D000641:Ammonia / Q000737:chemistry / Q000378:metabolism; D064751:Ammonium Compounds / Q000737:chemistry / Q000378:metabolism*; D001419:Bacteria / Q000145:classification* / Q000378:metabolism; D019149:Bioreactors; D019811:Hydroxylamine / Q000737:chemistry / Q000378:metabolism*; D006898:Hydroxylamines; D007700:Kinetics; D058465:Nitrification; D009573:Nitrites / Q000737:chemistry / Q000378:metabolism*; D010084:Oxidation-Reduction; D012722:Sewage / Q000382:microbiology
chemical_list: D064751:Ammonium Compounds; D006898:Hydroxylamines; D009573:Nitrites; D012722:Sewage; D019811:Hydroxylamine; D000641:Ammonia