title: [Complete nitritation process in an biofilm moving bed system by controlling pH].
abstract: Complete nitritation process in an biofilm moving bed system was started-up by inoculating nitrobacteria and controlling pH, and the effects of nitrogen loading rate (NLR) and hydraulic retention time (HRT) on the stability of the system were investigated. The results showed that the system could achieve complete nitritation after 10 day's acclimation by controlling pH within the range of 7.7 - 8.2, under the conditions of temperature (30 +/- 1) degrees C, DO 1.5 - 2.0 mg/L, HRT 24 h,ammonia concentration 150 mg/L. Conversion rate of ammonia was above 96% and nitritation rate (NO2(-) -N/NO(x)(-) -N) was more than 95%. In addition, the system remained complete nitritation when NLR increased from 0.15 kg/(m3 x d) to 0.24 kg/(m3 x d), and conversion rate of ammonia was still above 90%, nitritation rate maintained at 96%, but the type of nitrification turned from completely nitritation to completely nitrification under the condition of over aeration by extended HRT under low NLR. However, it could be resumed by shortened HRT.
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China. denngpin@126.com
authors.forename: Pin
authors.initials: P
authors.lastname: Deng
authors.forename: Xiao-Ming
authors.initials: XM
authors.lastname: Li
authors.forename: Qi
authors.initials: Q
authors.lastname: Yang
authors.forename: Shao-Qiang
authors.initials: SQ
authors.lastname: Zhang
authors.forename: Guang-Ming
authors.initials: GM
authors.lastname: Zeng
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Long-Sheng
authors.initials: LS
authors.lastname: Yi
mesh_terms: D001673:Biodegradation, Environmental; D018441:Biofilms; D019149:Bioreactors; D006863:Hydrogen-Ion Concentration; D009573:Nitrites / Q000737:chemistry* / Q000378:metabolism; D009576:Nitrobacter / Q000378:metabolism / Q000502:physiology*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D009573:Nitrites; D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical