摘要
研究了不同NH4+浓度下SBR系统脱氮中的N2O排放,并采用PCR-DGGE技术分析了微生物群落特征。结果发现,随着NH4+浓度的提高,氮素转化效率下降,此时脱氮中N2O-N所占比例明显增加,实验条件下N2O-N在脱氮中所占比例在0.25%~6.35%之间;当氮素转化顺利进行时,N2O的排放时期主要在SBR工艺好氧硝化段的同时硝化反硝化阶段,当氮素转化受到抑制时,在好氧硝化段和缺氧反硝化段均有大量N2O排放;不同NH4+浓度下微生物群落会发生相应变化。表明污水脱氮中的N2O排放不仅受氮素转化的影响,同时还受微生物群落结构的影响。
N2O emissions in SBR denitrification process have been studied under different NH4~ concentrations, and PCR-DGGE has been used for analyzing the characteristics of microbial communities. The results show that with the increase of NH4+ concentrations,the efficiency of nitrogen transformation rate decreases in this SBR system. Meantime,the N2O-N proportion in denitrification increases remarkably. Under the experimental conditions,the proportions of NzO-N in denitrification are ranged from 0.25% to 6.35%. When the nitrogen transformation goes favorably, N20 emission period mainly occurs in SND during aerobic nitrification section in SBR. When the nitrogen transformation is inhibited,there are a large number of N20 emissions in aerobic nitrification section and anoxin nitrification section. And the microbial communities have a corresponding changes under different concentrations of NH4+. The results indicate that N2O emission in wastewater denitrification is affected by not only the nitrogen conversion efficiency but also the changes in microbial community structures.
出处
《工业水处理》
CAS
CSCD
北大核心
2011年第11期19-22,共4页
Industrial Water Treatment
基金
国家自然科学基金资助项目(22677047)
国家水体污染控制与治理科技重大专项(2008ZX07317-007-1)
关键词
SBR系统
氮素转化
微生物群落
N2O排放
sequencing batch reactor system
nitrogen transformation
microbial community
N20 emission