在实验室规模的缺氧-好氧反应器中通过交替曝气速率来探索不同 DO 水平下细菌群落组成与氧化亚氮排放之间的联系。
Exploring the linkage between bacterial community composition and nitrous oxide emission under varied DO levels through the alternation of aeration rates in a lab-scale anoxic-oxic reactor.
机构信息
School of Civil and Architecture Engineering, Northeast Electric Power University, Jilin 132012, China.
School of Civil and Architecture Engineering, Northeast Electric Power University, Jilin 132012, China.
出版信息
Bioresour Technol. 2019 Nov;291:121809. doi: 10.1016/j.biortech.2019.121809. Epub 2019 Jul 13.
Dissolved oxygen (DO) level is crucial in shaping bacterial community and impacts biological nitrogen removal and nitrous oxide (NO) emission. Online gaseous and off-line dissolved NO under varying DO levels through aeration rate alternations were measured in lab-scale anoxic-oxic reactors. It showed that sharp changes in DO levels caused immediate NO emission increase, while the total average gaseous NO emission stabilized at 0.011%, 0.046%, 0.308% and 0.229% of influent nitrogen as DO in oxic tanks averaged at 0.58, 1.67, 3.2 and 6.12 mg/L, respectively. Process with an average DO concentration of 1.67 mg/L had the highest microbial diversity and relative abundances of potential denitrifers and ammonia-oxidizing bacteria (NOB), while the least ammonia-oxidizing bacteria (AOB) were detected, which contributed to efficient nitrogen removal and minor NO emission. In conclusion, regulation and control of denitrifiers, AOB and NOB with the determination of a proper DO set point is feasible for NO mitigation.
溶解氧（DO）水平对细菌群落的形成至关重要，并影响生物脱氮和氧化亚氮（NO）的排放。通过改变曝气速率，在实验室规模的缺氧-好氧反应器中在线测量了不同 DO 水平下的气态和离线溶解态 NO。结果表明，DO 水平的急剧变化会立即导致 NO 排放增加，而总平均气态 NO 排放稳定在 0.011%、0.046%、0.308%和 0.229%，进水氮分别为好氧池中的 DO 平均值为 0.58、1.67、3.2 和 6.12mg/L。在平均 DO 浓度为 1.67mg/L 的条件下，微生物多样性最高，潜在反硝化菌和氨氧化菌（NOB）的相对丰度最高，而检测到的氨氧化菌（AOB）最少，这有助于高效脱氮和减少 NO 排放。总之，通过确定适当的 DO 设定点来调控反硝化菌、AOB 和 NOB 是可行的，可以减轻 NO 的排放。
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