摘要
采用SBR反应器，在不同游离氨（FA）浓度梯度结合限时曝气条件下，考察了FA对全程硝化活性污泥（CNAS）和短程硝化活性污泥（PNAS）的抑制特性。结果表明，当3FA浓度介于2．5。197．2mg／L时，CNAS和PNAS系统内均可发生较好的硝化作用，氨氧化速率（AOR）均维持在较高水平，表明氨氧化茵（AOB）活性未受到抑制。但对于CNAS系统，当3FA浓度达到137．6～168．4mg／L时，亚硝酸盐氧化茵（NOB）活性受到完全抑制。此外，CNAS和PNAS的比氨氧化速率（SAOR）与FA浓度之间总体上呈现出指数增长关系，仅在反应的初始阶段，CNAS的SAOR表现出略微降低的适应过程。相对于CNAS，PNAS具有更强的抵抗FA抑制的能力。
The inhibitory properties of free ammonia （FA） at different concentration gradients combined with the limit of aeration on complete nitrification activated sludge （CNAS） and partial nitrifi- cation activated sludge （PNAS） were investigated in SBR. The results showed that when the FA concen- trations ranged from 2.5 to 197.2 mg/L, nitrification occurred both in CNAS and PNAS systems, and ammonia oxidation rates （AOR） were maintained at a high level, indicating that the activity of ammonia- oxidizing bacteria （AOB） was not inhibited. When the FA concentrations were 137.6 to 168.4 mg/L in the CNAS system, the activity of nitrite-oxidizing bacteria （NOB） was completely inhibited. In addition, there was an exponential relationship between the FA concentration and the specific ammonia oxidation rates （SAOR） of the CNAS and the PNAS. Only at the initial stage of the reaction, SAOR of the CNAS showed a slight decrease in the adaptation phase. Compared with the CNAS, the PNAS had stronger abil- ity to resist the FA inhibition.
出处
《中国给水排水》
CAS
CSCD
北大核心
2015年第3期19-23,共5页
China Water & Wastewater
基金
国家自然科学基金资助项目(51168028
51168027)
甘肃省青年基金计划项目(11072RJYA279)
兰州交通大学"大学生创新性实验计划"项目(20140042)
关键词
硝化菌活性
游离氨
抑制作用
比氨氧化速率
activity of nitrifying bacteria
free ammonia
inhibition
specific ammonia oxidation rate
