溶解氧和污泥粒径分布对城市污水SND影响  

Effect of Dissolved Oxygen and the Distribution of Sludge Particles Diameter on the Simultaneous Nitrification and Denitrification

作　　者：王川[1] 聂会元[2] 左金龙[3] 李桥[4] 

机构地区：[1]重庆大学建设管理与房地产学院 [2]重庆大学科技企业集团 [3]哈尔滨商业大学环境工程系,哈尔滨150076 [4]重庆大学城市建设与环境工程学院,重庆400045

出　　处：《土木建筑与环境工程》2010年第3期145-148,154,共5页Journal of Civil,Architectural & Environment Engineering

基　　金：国家高技术研究发展计划(863)项目(2006AA06Z319);黑龙江省自然科学基金(E200931)

摘　　要：为了进一步探讨同步硝化反硝化的反应机理,采用SBR工艺,考察溶解氧和污泥粒径分布对城市污水同步硝化反硝化的影响。结果表明:低溶解氧(平均DO=0.5~0.8 mg/L)条件下,氮平衡计算证实SBR工艺发生了明显的SND现象,总氮中大约23.11%的氮是通过SND现象去除的。当DO浓度为0.5 mg/L时,硝态氮生成量与氨氮的减少量之比为0.454,硝化速率与反硝化速率基本相当。当DO浓度为4.296 mg/L时,硝化反应产生的氨氮的减少量与硝态氮的生成量相等,此时基本不发生SND现象。当SND发生时,污泥菌胶团颗粒的平均颗粒粒径仅为5.02μm^6μm,说明SND不是单纯的"微环境作用"的结果。In order to discuss the reaueing theory of simultaneous nitrification and denitrification （SND）, with the sequence batch reactor （SBR）, the dissolved oxygen （DO） and the floc size distribution were investigated for sewage wastewater. It is found that the SND can be attained in SBR process by nitrogen mass balance calculation with low DO （mean value 0.5 mg/L-0.8 mg/L）. Around 23.11% nitrogen in total nitrogen is removed by SND. The ratio of nitrate formation and ammonia decay is at 0. 454 with the DO concentration at 0.5 mg/L. Meanwhile, the velocity of nitrification and denitrification is equal. And the SND couldn＇t occur when the ratio of nitrate formation and ammonia decay is equal with DO at 4. 296 mg/ L. The mean floc size distribution of sludge is at the range of 5.02μm-6 μm, that is, the SND is not the results of ＂micro environment action＂ when SND occurs.

关 键 词：溶解氧 污泥粒径分布 同步硝化反硝化 硝化速率 反硝化速率 

分 类 号：X703.1[环境科学与工程—环境工程]