title: Inhibition kinetics of nitritation and half-nitritation of old landfill leachate in a membrane bioreactor.
abstract: Nitritation can be used as a pretreatment for anaerobic ammonia oxidation (anammox). Various control strategies for nitritation and half-nitritation of old landfill leachate in a membrane bioreactor were investigated in this study and the inhibition kinetics of substrate, product and old landfill leachate on nitritation were analyzed via batch tests. The results demonstrated that old landfill leachate nitritation in the membrane bioreactor can be achieved by adjusting the influent loading and dissolved oxygen (DO). From days 105-126 of the observation period, the average effluent concentration was 871.3 mg/L and the accumulation rate of [Formula: see text] was 97.2%. Half-nitritation was realized quickly by adjusting hydraulic retention time and DO. A low-DO control strategy appeared to best facilitate long-term and stable operation. Nitritation inhibition kinetic experiments showed that the inhibition of old landfill leachate was stronger than that of the substrate [Formula: see text] or product [Formula: see text] . The ammonia oxidation rate dropped by 22.2% when the concentration of old landfill leachate (calculated in chemical oxygen demand) was 1600.2 mg/L; further, when only free ammonia or free nitrous acid were used as a single inhibition factor, the ammonia oxidation rate dropped by 4.7-6.5% or 14.5-15.9%, respectively. Haldane, Aiba, and a revised inhibition kinetic model were adopted to separately fit the experimental data. The R2correlation coefficient values for these three models were 0.982, 0.996, and 0.992, respectively.
authors.affiliation: College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 1000124, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Li
authors.affiliation: College of Energy and Environmental Engineering, Hebei University of Engineering, Handan, 056038 Hebei, China.
authors.forename: Zhaozhao
authors.initials: Z
authors.lastname: Wang
authors.affiliation: College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 1000124, China. Electronic address: jglijunbjut@163.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.affiliation: College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 1000124, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Wei
authors.affiliation: College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 1000124, China.
authors.forename: Yanzhuo
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 1000124, China.
authors.forename: Baihang
authors.initials: B
authors.lastname: Zhao
mesh_terms: D064751:Ammonium Compounds / Q000378:metabolism; D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D007700:Kinetics; D009573:Nitrites / Q000378:metabolism*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000378:metabolism*
chemical_list: D064751:Ammonium Compounds; D009573:Nitrites; D014874:Water Pollutants, Chemical; D010100:Oxygen
keywords: Half-nitritation; Inhibition kinetics; Membrane bioreactor; Nitritation; Old landfill leachate