摘要
亚硝酸盐氧化菌(NOB)增长是导致城市污水短程硝化-厌氧氨氧化(partial nitrification/anammox,PN/A)工艺脱氮效率降低的主要原因之一.采用SBR反应器研究了周期性的进水氨氮负荷变化对城市污水PN/A工艺出水硝酸盐的影响.结果表明:恒定曝气量和曝气时间,进水氨氮负荷周期性降低时,PN/A工艺出水硝态氮逐渐增长,导致系统脱氮性能下降.在硝态氮增长之后,保持进水氨氮负荷稳定,系统的脱氮性能未恢复.进一步分析表明:低氨氮浓度下,NOB对于溶解氧的竞争是出水硝态氮增长的主要原因.因此,在城市污水PN/A工艺中,为了维持稳定的脱氮性能需要控制溶解氧和出水氨氮浓度.
The over-proliferation ofnitrite-oxidizing bacteria(NOB)is one of the main causes for the decrease of thenitrogen removal efficiency in municipal wastewater partial nitritation/anammox(PN/A)process.Municipal wastewaterPN/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,influentammonium concentration varied periodically while aeration rate and duration remained constant,inducing a variation ofNLR within the range of0.24~0.48kgN/(m3·d).Effluent nitrate concentration gradually increased under the variation ofNLR,resulting in the decline of both nitrogen removal rate and efficiency.Followed by the variation of NLR,the reactorwas operated at a stable NLR,which was failed to restore the nitrogen removal performance.NOB was easier to competefor 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 operationofPN/A systems.
作者
程军
张亮
张树军
杨延栋
谷鹏超
彭永臻
CHENG Jun;ZHANG Liang;ZHANG Shu-jun;YANG Yan-dong;GU Peng-chao;PENG Yong-zhen(National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology,Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China;Research and Development Center of Beijing Drainage Group Corporation, Beijing Wastewater Recycling Engineering Technology Research Center, Beijing 100022, China;Harbin Institute of Technology, Harbin 150090, China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2017年第2期520-525,共6页
China Environmental Science
基金
国家自然科学基金(51478013)
北京市教委资助项目
