同步硝化反硝化处理氨氮废水过程中气态脱氮产物的研究

采用密闭的间歇式反应器对高质量浓度氨氮废水在同步硝化反硝化(SND)生物脱氮过程中产生的3种氮氧化物气体(NO,NO2和N2O)进行跟踪测试.结果表明,在由反应器排出的气体中,ρ(NO2)不高于实验室背景值,在脱氮产物中可忽略不计,而ρ(NO)和ρ(N2O)要高于背景值10倍以上.对于该脱氮系统,在低ρ(DO)和高pH的条件下产生的N2O相对较少.ρ(DO)为1.5～3.0 mg/L时,以NO和N2O形式脱除的氮分别占脱氮总量的0.58%和6.53%;ρ(DO) 为2.5～4.0 mg/L时,分别为0.48%和39.34%.此外,还分析了可实施的N2O控逸途径. 

Study on Gaseous Nitrogen Compounds Emitted during Ammoniac Wastewater SND Process

Three emitted gaseous nitrogen compounds were traced, when high strength ammonia containing wastewater was treated in a sealed intermittent reactor by Simultaneous Nitrification and Denitrification （SND） process. The emitted NO₂ amount was less than background value of the laboratory. NO₂ was therefore neglected. However, emitted NO and N₂O were more than 10 times of the background. Less N₂O was emitted under low DO and high pH condition. Under different DO mass concentration conditions, it was obtained by diagrammatic integral method that about 0.58% and 6.53% of total lost nitrogen was emitted as NO and N₂O, respectively（DO mass concentration is 1.5～3.0 mg/L）, and 0.48% and 39.34% of total lost nitrogen was emitted as NO and N₂O, respectively （DO mass concentration is 2.5～4.0 mg/L）. Moreover, the available means to control N₂O emission was discussed.