title: [Effect of HCO3- on Nitrogen Removal Efficiency in Partial Nitritation-ANAMMOX Process].
abstract: The effect of HCO3- on nitrogen removal efficiency in partial nitritation-ANAMMOX process was studied by using the combined process of partial nitritation and ANAMMOX has been started and achieved the stable operation of nitrogen removal. The results showed that, when the ratio of C/N decreased from 2 to 0.17 in influent, the nitrogen removal rate decreased from 1.3 kg- ( M3 x d)(-1) to 0.40 kg x (M3 x d)(-1), the decrease range arrived at 69.3%. The nitrogen conversion efficiency was limited, because of the added amount of HCO3- was decreased, which leading to the pH value declined sharply in nitritation and ANAMMOX zone. In the partial nitritation-ANAMMOX process, the effect of HCO3- limitation on activity of ammonium oxidizing bacteria, ANAMMOX bacteria and nitrifying bacteria was decreased in turn. When the C/N ratio increased to 1, the nitrogen removal rate of combined process was quickly restored to 1 kg x (m3 x d)(-1). It indicated that short HCO3- limitation on nitrogen conversion efficiency of the combined process can be fast recovery. The resulted also showed that the relationship between influent C/N ratio and nitrogen removal efficiency has obvious relativity in partial nitritation-ANAMMOX process.
authors.forename: Xiang
authors.initials: X
authors.lastname: Li
authors.forename: Zong-heng
authors.initials: ZH
authors.lastname: Cheng
authors.forename: Yong
authors.initials: Y
authors.lastname: Huang
authors.forename: Yi
authors.initials: Y
authors.lastname: Yuan
authors.forename: Xin
authors.initials: X
authors.lastname: Liu
authors.forename: Da-lin
authors.initials: DL
authors.lastname: Zhang
mesh_terms: D064751:Ammonium Compounds; D001419:Bacteria; D001639:Bicarbonates / Q000737:chemistry*; D058440:Denitrification; D009584:Nitrogen / Q000737:chemistry*
chemical_list: D064751:Ammonium Compounds; D001639:Bicarbonates; D009584:Nitrogen