碳源类型对短程同步硝化反硝化过程N_2O释放的影响  

Effect of Carbon Source Types on Nitrous Oxide Emission from Short-cut Simultaneous Nitrification and Denitrification Process

作　　者：严迎燕 李平[2,3] 吴锦华[2,3] 马伟文[2,3] 

机构地区：[1]广东环境保护工程职业学院实训中心,广东佛山528216 [2]华南理工大学环境与能源学院工业聚集区污染控制与生态修复教育部重点实验室,广东广州510006 [3]华南理工大学环境与能源学院污染控制与生态修复广东省普通高等学校重点实验室,广东广州510006

出　　处：《中国给水排水》2016年第11期100-104,共5页China Water & Wastewater

基　　金：国家自然科学基金资助项目(20477011);广东省教育部产学研结合项目(2012B091100146)

摘　　要：采用序批式气升环流生物反应器(SBAR)构建短程同步硝化反硝化(SND)体系,在此基础上,考察碳源类型对短程SND脱氮特性与N_2O释放的影响。研究发现,碳源类型可引起脱氮中间产物NO-2的积累率差异,从而导致N_2O释放的显著不同。分别以葡萄糖、乙酸钠、可溶性淀粉为碳源的反应器,在短程SND脱氮过程中,NO-2积累率分别为88.35%、93.67%和70.39%;以乙酸钠为碳源时,N_2O释放量及其转化率最高,其N_2O释放量约为葡萄糖和可溶性淀粉的1.5倍,N_2O转化率则比葡萄糖和可溶性淀粉高出约25%。污泥微观结构的SEM照片和SOUR结果表明,不同碳源所形成的好氧颗粒污泥中微生物组成与活性的差异,造成脱氮过程NO-2积累程度的不同,从而导致N_2O释放特征的差异。Short-cut simultaneous nitrification and denitrification （SND） was achieved in a sequencing batch airlift reactor （SBAR）. Based on this condition, the effect of carbon source types on the nitrogen removal performance and N2O emission characteristic in the short-cut SND process was evaluated. The results showed that the carbon source had a great effect on nitrite accumulation rate （NAR）, resuiting in the dramatic difference of N2O emission. The NARs of short-cut SND process, simulated by glucose, acetate and starch, were 88.35%, 93.67% and 70.39%, respectively. The N2O emission with acetate as carbon source was nearly 1.5 times as much as those with glucose and starch, and the N2O conversion rate with acetate as the carbon source was about 25% higher than those with glucose and starch. The results of the scanning electron micrograph of sludge microstructure and the specific oxygen uptake rate indicated that the differences of microbial composition and activity of aerobic granules formed by different carbon sources resulted in the different degrees of nitrite accumulation rate, which led to the variation of N2O emission in the short-cut SND process.

关 键 词：短程同步硝化反硝化 碳源类型 氧化亚氮 生物脱氮 

分 类 号：X703[环境科学与工程—环境工程]