• 关键词：生活污水  短程生物脱氮  流量分配  N₂O  好氧反硝化

• 基金项目：河北省高等学校科学技术研究青年基金（No.QN20131172）；“十一五”国家科技支撑计划重点项目（No.2009BAC57B01-2）；河北省科技厅科技支撑计划项目（No.12273611）

• 巩有奎
• 1. 石家庄铁路职业技术学院, 石家庄 050041;2. 北京工业大学环境与能源工程学院, 北京 100022

• 彭澄瑶
• 北京工业大学环境与能源工程学院, 北京 100022

• 王淑莹
• 北京工业大学环境与能源工程学院, 北京 100022

• 彭永臻
• 北京工业大学环境与能源工程学院, 北京 100022

• 摘要：利用SBR反应器，通过在线pH曲线控制好氧-缺氧反应时间，成功实现了短程生物脱氮，并考察了分段进水条件下流量分配对SBR反应器运行性能及N₂O产量的影响.结果表明，与原水分2次在不同阶段等量加入反应器的二段进水方式相比，原水分3次等量进入反应器的三段进水方式能够有效降低脱氮过程中外碳源投加量和氧化亚氮产量；氧化亚氮主要产生于硝化过程，反硝化过程能够将硝化阶段积累的N₂O还原至N₂.2次、3次等量进水条件下，生物短程脱氮过程中乙醇投加量分别为0.8和0.6 mL，N₂O释放量分别为8.86和5.05 mg·L^-1（以N计）.硝化过程中NO₂^--N的积累是导致系统N₂O产生的主要原因.

• Abstract：A step-feed sequencing batch reactor (SBR) was proposed to make full use of the influent carbon source and reduce external carbon source addition. Through on-line pH control, two different step-feed modes were compared in terms of nitrogen removal efficiency and N₂O emissions. Compared with two-equal influent flow mode, both the external carbon addition and N₂O emission decreased in three-equal influent flow mode. It was found that most of the N₂O was produced and emitted during nitrification process. For denitrification, the dissolved N₂O accumulated during nitrification process could be reduced to N₂ provided that sufficient carbon source was added. The amount of ethanol addition for two-and three-equal influent flows were 0.8 mL and 0.6 mL, respectively, while N₂O emission decreased from 8.86 mg·L^-1 to 5.05 mg·L^-1. The accumulation of nitrite during nitrification was a potentially key factor that resulted in N₂O emission.

• Key words：domestic sewage  short-cut nitrogen removal  flowing distribution  nitrous oxide  nitrifier denitrification

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