1. National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China; 2. Research and Development Center of Beijing Drainage Group Corporation, Beijing Wastewater Recycling Engineering Technology Research Center, Beijing 100022, China; 3. Harbin Institute of Technology, Harbin 150090, China
Abstract：The over-proliferation ofnitrite-oxidizing bacteria (NOB) is one of the main causes for the decrease of the nitrogen removal efficiency in municipal wastewater partial nitritation/anammox (PN/A) process. Municipal wastewater PN/A was established in a sequencing batch reactors (SBR) and the effect of periodic nitrogen loading rate (NLR) fluctuation on nitrate accumulation in the PN/A process was investigated.During the experimental period, influent ammonium concentration varied periodically while aeration rate and duration remained constant, inducing a variation of NLR within the range of 0.24~0.48kgN/(m3·d). Effluent nitrate concentration gradually increased under the variation of NLR, resulting in the decline of both nitrogen removal rate and efficiency. Followed by the variation of NLR, the reactor was operated at a stable NLR, which was failed to restore the nitrogen removal performance. NOB was easier to compete for oxygen at low bulk ammonium concentrations, which was the main reason for the unwanted nitrate accumulation. Therefore, a stricterprocess control of DO andresidual ammonium concentration was essential to the stable operation ofPN/A systems.
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