title: [Stability of short-cut nitrification using immobilized ammonia-oxidizing bacteria].
abstract: The ammonia-oxidizing bacteria were immobilized by copolymer with cell proliferation technology. The effects of NH(4+) -N load, HRT, free ammonia (FA) and organic matter on short-cut nitrification process were studied. The results showed that when influent NH(4+) -N load were 100 mg/L, 150 mg/L and 200 mg/L respectively, effluent NH(4+) -N concentration was less than 10 mg/L. When the system run for 3 h, 6 h and 12 h, corresponding to influent NH(4+) -N concentration of 25.8 mg/L, 51.1 mg/L and 93.3 mg/L respectively, NH(4+) -N concentration was low in effluent with high short-cut nitrification efficiency. The HRT could be adjusted to optimize the system operation with variation of influent NH(4+) -N concentration. The results also indicated that the ammonia-oxidizing bacteria were restrained while free ammonia concentration was over 9 mg/L. The activity of the ammonia-oxidizing bacteria could be enhanced under existence of low-molecular-weight organic compounds, but the short-cut nitrification efficiency was little affected. In addition, the short-cut nitrification and denitrification could be realized with existence of organic compounds during the experiment.
authors.affiliation: State Key Laboratory of Pollutant Control and Resources Reuse, School of Environment, Nanjing University, Nanjing 210093, China. zhkuili@nju.edu.cn
authors.forename: Zheng-Kui
authors.initials: ZK
authors.lastname: Li
authors.forename: Ding-Dong
authors.initials: DD
authors.lastname: Lai
authors.forename: Zhu-You
authors.initials: ZY
authors.lastname: Yang
authors.forename: Xiao-Jiao
authors.initials: XJ
authors.lastname: Zhang
authors.forename: Fang-Jie
authors.initials: FJ
authors.lastname: Li
mesh_terms: D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D043369:Nitrosomonadaceae / Q000378:metabolism / Q000502:physiology*; D009606:Nitrosomonas / Q000378:metabolism / Q000502:physiology; D009930:Organic Chemicals / Q000378:metabolism; D000644:Quaternary Ammonium Compounds / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D009930:Organic Chemicals; D000644:Quaternary Ammonium Compounds