GAOJia,ZONGNi,LIUJian,et al.N2O Production and Discharge Characteristics and Key Influencing Factors of Surface Aeration Oxidation Ditch Process[J].China Water & Wastewater,2025,41(19):95-101.
表面曝气型氧化沟中N2O产排特征与关键影响因素
- Title:
- N2O Production and Discharge Characteristics and Key Influencing Factors of Surface Aeration Oxidation Ditch Process
- Keywords:
- surface aeration oxidation ditch; nitrous oxide (N2O); emission factor; key influencing factor; isotope traceability
- 摘要:
- 对北方某大型城市污水处理厂表面曝气型氧化沟工艺进行了为期1年的氧化亚氮（N2O）排放通量监测。结果显示，曝气区的N2O气相排放因子比非曝气区高2~3个数量级，而两个区域的液相排放因子则处于同一量级；无论是曝气区还是非曝气区，N2O主要是以液相形式存在；从总排放因子来看，两区域均呈现出冬春季低、夏秋季高的趋势。双同位素溯源结果显示，曝气区与非曝气区的N2O均来源于不同过程的混合：在以反硝化过程为主的非曝气区中可以测得有41.71%的N2O来源于硝化过程，而曝气区中反硝化过程的贡献率达到了41.69%。N2O排放因子的波动与进水NH4+-N浓度和C/N呈现显著相关。非曝气区与曝气区的活性污泥结构并无显著不同，活性污泥存在着一个相对稳定的微生物菌群，优势菌属Acinetobacter、Intestinibacter、Trichococcus均具有较高的代谢多样性和生存灵活性。这些结果为未来城市污水生物处理过程中N2O的产排控制策略构建指明了主要关键因子与潜在控制方向。
- Abstract:
- Nitrous oxide (N2O) emission fluxes were monitored for one year in a surface aeration oxidation ditch at a full-scale municipal wastewater treatment plant in northern China. Results showed that the gaseous N2O emission factor in the aeration section was 2-3 orders of magnitude higher than those in the non-aeration section, while the liquid phase emission factor remained comparable between the two sections. In both sections, N2O predominantly existed in the liquid phase. The total emission factors in both sections exhibited a seasonal pattern with lower values in winter-spring and higher values in summer-autumn. Dual isotope source tracking revealed that N2O in both sections originated from mixed nitrogen removal processes: in the non-aeration section, 41.71% of N2O originated from nitrification, while in the aeration section, denitrification contributed 41.69%. N2O emission factors showed significant correlation with influent NH4+-N concentration and C/N ratio. The activated sludge structure showed no significant difference between non-aeration and aeration sections, maintaining a relatively stable microbial community. The dominant genera, including Acinetobacter, Intestinibacter, and Trichococcus, demonstrated high metabolic diversity and survival flexibility. These findings identify key factors and potential control strategies for N2O production and emission regulation in future municipal wastewater biological treatment processes.
相似文献/References:
[1]许可,周红明,张德跃,等.城市生活污水处理行业温室气体排放结构及发展趋势[J].中国给水排水,2023,39(14):27.
XUKe,ZHOUHong-ming,ZHANG De-yue,et al.Structure and Development Trend of Greenhouse Gas Emissions in Urban Domestic Sewage Treatment Industry[J].China Water & Wastewater,2023,39(19):27.
[2]曲立民,高彦博.硫磺/零价铁联合强化潜流人工湿地脱氮除磷性能[J].中国给水排水,2023,39(14):102.
QULi-min,GAO Yan-bo.Enhanced Removal for Nitrogen and Phosphorus by Using Sulfur and Zero?valent Iron in Submerged Constructed Wetland[J].China Water & Wastewater,2023,39(19):102.
[3]孔海霞,吝力,吕永涛,等.酸性条件下NO2-型反硝化富集N2O的影响因素[J].中国给水排水,2024,40(23):57.
KONGHai-xia,LINLi,LüYong-tao,et al.Factors Influencing Nitrous Oxide Enrichment during Nitrite Denitrification under Acidic Conditions[J].China Water & Wastewater,2024,40(19):57.