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首页> 外文期刊>Environmental Science & Technology >Robust Nitritation of Anaerobic Digester Centrate Using Dual Stressors and Timed Alkali Additions
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Robust Nitritation of Anaerobic Digester Centrate Using Dual Stressors and Timed Alkali Additions

机译：使用双重压力源和定时碱度添加的厌氧消化器的鲁棒陶醉

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摘要

Nitrogen is commonly removed from wastewater by nitrification to nitrate followed by nitrate reduction to N_2.Shortcut N removal saves energy by limiting ammonia oxidation to nitrite, but nitrite accumulation can be unstable.We hypothesized that repeated short-term exposures of ammonia-oxidizing communities to free ammonia (FA) and free nitrous acid (FNA) would stabilize nitritation by selecting against nitrite-oxidizing bacteria (NOB).Accordingly, we evaluated ammonium oxidation of anaerobic digester centrate in two bench-scale sequencing batch reactors (SBRs), seeded with the same inoculum and operated identically but with differing pH-control strategies.A single stressor SBR (SS/ SBR) using pH set-point control produced HNO_3, while a dual stressor SBR (DS/SBR) using timed alkalinity addition (TAA) produced HNO_2 (ammonium removal efficiency of 97 ± 2%; nitrite accumulation ratio of 98 ± 1%).The TAA protocol was developed during an adaptation period with continuous pH monitoring.After adaptation, automated TAA enabled stable nitritation without set-point control.In the SS/SBR, repeatedly exposing the community to FA (8-10 h/exposure, one exposure/cycle) selected for FA-tolerant ammonia-oxidizing bacteria (Nitrosomonas sp.NM107) and NOB (Nitrobacter sp.).In the DS/SBR, repeatedly exposing the community to FA (2-4 h/exposure, three exposures/ cycle) and FNA (4-6 h/exposure, two exposures/cycle) selected for FA- and FNA-resistant AOB (Nitrosomonas IWT514) and against NOB, stabilizing nitritation.
机译：通过硝化硝化硝酸盐，硝酸盐常量除去氮气，然后通过将氨氧化限制为亚硝酸盐，但亚硝酸盐积聚可以不稳定，硝酸盐释放可以不稳定。我们假设反复氧化氨氧化社区的短期暴露。通过选择硝酸盐氧化细菌（NOB），可以通过选择硝酸盐氧化细菌（NOB）来稳定氨（Fa）和游离亚硝酸（Fa）和游离亚硝酸（Fa）和游离亚硝酸相同的接种物和相同的操作，但是使用pH设定点控制不同的pH值控制strategies.A单应力源SBR（SS / SBR）产生HNO_3，而双应力源SBR（DS / SBR）使用定时碱度加成（TAA）所产生HNO_2（铵去除效率为97±2％;亚硝酸盐累积比为98±1％）。在适应期间开发的TAA协议在连续pH监测期间开发ER适应，自动化的TAA使得没有设定点控制的稳定亚硝化。在SS / SBR中，反复将社区暴露于为FA（8-10h /暴露，一个曝光/循环），选择为耐受氨氧化细菌（亚硝基菌sp.nm107）和nob（硝基杆菌sp。）。在ds / sbr中，反复将社区暴露于fa（2-4 h /曝光，三个曝光/循环）和fna（4-6 h /曝光，两个曝光/循环）选择用于FA和FNA和FNA抗性AOB（Nitrosomonas IWT514）和NOB，稳定亚硝。

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  • 来源
    《Environmental Science & Technology》 |2021年第3期|2016-2026|共11页
  • 作者

    Yinuo Yao; Zhiyue Wang; Craig S. Criddle;

  • 作者单位

    Department of Civil and Environmental Engineering Stanford University Stanford California 94305 United States;

    Department of Civil and Environmental Engineering Stanford University Stanford California 94305 United States;

    Department of Civil and Environmental Engineering Stanford University Stanford California 94305 United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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