基于曝气方式控制的碳捕获预处理黑水部分亚硝化工艺

短程硝化是短程生物脱氮工艺的前提与难点，通过曝气控制实现短程硝化具有操作灵活、成本低等优点。本文采用序批式活性污泥反应器，对比分析了高氧持续曝气、间歇曝气和低氧持续曝气3种曝气方式实现碳捕获预处理黑水短程硝化的效果和微生物群落结构的差异。结果表明：相对于高氧持续曝气和间歇曝气，低氧持续曝气工况亚硝态氮累积率(NAR)更高，出水NO₂⁻-N/NH₄⁺-N更接近厌氧氨氧化进水的水质要求；高氧持续曝气工况能逐步洗脱Nitrospira，同时提高AOB和Nitrobacter的相对丰度；低氧持续曝气工况显著降低了Nitrobacter的相对丰度，但低DO条件下AOB丰度降低并出现了Nitrospira。以上研究结果表明，针对碳捕获后的黑水，采用高氧持续曝气与低氧持续曝气交替组合运行的控制策略有助于实现更好的短程硝化效果和运行稳定性。

Partial nitritation based on aeration control strategies for carbon-captured blackwater pretreatment

Nitritation is the precondition and difficulty of biological nitrogen removal process via nitrite pathway, meanwhile, its occurrence through aeration control has the advantages of flexible operation, lower cost and so on. Therefore, a sequencing batch activated sludge reactor (SBR) was used in this study, the partial nitritation effects and bacterial communities of three aeration control strategies for carbon-captured blackwater pretreatment were compared and analyzed, including high oxygen continuous aeration, intermittent aeration and low oxygen continuous aeration. The results show that, compared with high oxygen continuous aeration and intermittent aeration, the nitrite accumulation rate (NAR) for the working condition of low oxygen continuous aeration was higher, and the NO2−-N/NH4+-N ratio of effluent could better meet the influent quality of anammox. High oxygen continuous aeration could gradually elute Nitrospira and increase the relative abundance of AOB and Nitrobacter. Under low oxygen continuous aeration condition, the relative abundance of Nitrobacter decreased significantly, but under low DO condition, the abundance of AOB decreased and Nitrospira appeared. The results show that for the carbon-captured blackwater, the control strategy of alternating combination of high oxygen continuous aeration and low oxygen continuous aeration is helpful to achieve better nitritation and operation stability.