title: Achieving nitritation in a continuous moving bed biofilm reactor at different temperatures through ratio control.
abstract: A ratio control strategy was implemented in a continuous moving bed biofilm reactor (MBBR) to investigate the response to different temperatures. The control strategy was designed to maintain a constant ratio between dissolved oxygen (DO) and total ammonia nitrogen (TAN) concentrations. The results revealed that a stable nitritation in a biofilm reactor could be achieved via ratio control, which compensated the negative influence of low temperatures by stronger oxygen-limiting conditions. Even with a temperature as low as 6°C, stable nitritation could be achieved when the controlling ratio did not exceed 0.17. Oxygen-limiting conditions in the biofilm reactor were determined by the DO/TAN concentrations ratio, instead of the mere DO concentration. This ratio control strategy allowed the achievement of stable nitritation without complete wash-out of NOB from the reactor. Through the ratio control strategy full nitritation of sidestream wastewater was allowed; however, for mainstream wastewater, only partial nitritation was recommended.
authors.affiliation: College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Bian
authors.affiliation: College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Shuyan
authors.initials: S
authors.lastname: Zhang
authors.affiliation: College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Yanzhuo
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Wenjing
authors.initials: W
authors.lastname: Li
authors.affiliation: College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Ruizhe
authors.initials: R
authors.lastname: Kan
authors.affiliation: College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Wenxiao
authors.initials: W
authors.lastname: Wang
authors.affiliation: College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Zhaoming
authors.initials: Z
authors.lastname: Zheng
authors.affiliation: College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China. Electronic address: jglijun@bjut.edu.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
mesh_terms: D000641:Ammonia / Q000378:metabolism; D018441:Biofilms; D019149:Bioreactors; D004867:Equipment Design; D009573:Nitrites / Q000032:analysis; D009584:Nitrogen / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D062065:Wastewater / Q000737:chemistry
chemical_list: D000641:Ammonia; D009573:Nitrites; D009584:Nitrogen; D010100:Oxygen; D062065:Wastewater
keywords: Biofilm; Dissolved oxygen; Nitritation; Temperature; Total ammonia nitrogen