pH对高氨废水限氧半亚硝化过程中N_2O释放的影响  

Effect of pH values on nitrous oxide emission during partial nitritation of high-ammonium wastewater under oxygen-limited condition

作　　者：吕永涛[1] 张雪玲[1] 王磊[1] 鞠恺[1] 孙婷[1] 苗瑞[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055

出　　处：《哈尔滨工业大学学报》2015年第6期88-93,共6页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51108367);高等学校博士学科点专项科研基金(20116120120009);陕西省自然科学基金(2014JQ7243)

摘　　要：为获得半亚硝化系统中强温室气体N2O减量化释放的控制参数,采用SBR处理人工合成高氨废水(进水氨氮质量浓度约为600 mg·L-1),考察不同进水pH(7.5,8.0和8.5)对N2O释放特性的影响.结果表明,不同进水pH下均释放N2O,每个周期内N2O的释放量随进水pH的升高而减小.pH为7.5,8.0及8.5时,N2O释放量分别占进水氨氮的3.81%、2.35%和2.00%.当pH为7.5时,曝气初始50 min内,N2O释放速率先增大后减小,峰值速率为44.5μg·min-1·g-1,之后维持在16.5μg·min-1·g-1;当p H为8.0及8.5时,曝气初期N2O释放峰值速率分别为33.7,22.9μg·min-1·g-1,之后释放速率随pH降低和NO2-积累而逐渐增大.To reduce the emission of the strong greenhouse gas nitrous oxide （N：O） in partial nitritation system, a lab-scale SBR treating synthetic high-ammonium wastewater （around 600 mg· L-1 of influent ammonia） was investigated for the effect of pH values （7.5, 8.0 and 8.5） on N2O emission. The results showed that, the N2O emission was observed under different pH values, and the total amount of N：O emission decreased with pH value increment. At pH 7.5, 8.0 and 8. 5, the N2O emission amount accounted for 3.81%, 2. 35% and 2. 00% of the influent ammonium nitrogen, respectively. At pH 7.5, in the initial 50 min the N2O emission rate firstly increased （maximum value of 44. 5 μg · min-1 · g-1） and then returned around 26. 4 μg · min-1 ·g-1. At pH 8.0 and 8. 5, 33.7 and 22. 9 μg · min-1 · g-1 of maximum N20 emission rate were achieved in the initial 50 min, respectively, however, they increased slowly with the pH decrease and nitrite accumulation.

关 键 词：序批式反应器 高氨废水 半亚硝化 N2O PH 

分 类 号：X703.1[环境科学与工程—环境工程]