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首页> 外文期刊>RSC Advances >Enhanced nitrite accumulation under mainstream conditions by a combination of free ammonia-based sludge treatment and low dissolved oxygen: reactor performance and microbiome analysis
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Enhanced nitrite accumulation under mainstream conditions by a combination of free ammonia-based sludge treatment and low dissolved oxygen: reactor performance and microbiome analysis

机译：通过游离氨基污泥处理和低溶解氧的组合增强了主流条件下的亚硝酸盐积累：反应器性能和微生物组分析

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Partial nitritation under mainstream conditions is one of the major bottlenecks for the application of deammonification processes to municipal wastewater treatment plants. This study aimed at evaluating the combination effect of a side-stream free ammonia (FA) treatment and low dissolved oxygen (0.2 +/- 0.1 mg L-1) on inhibiting nitrite oxidizing bacteria (NOB) from enhancing nitrite accumulation in long-term lab-scale experiments. Two continuous floccular sludge reactors treating low-strength synthetic wastewater (60 mg N-NH4+ L-1 without COD) with a fixed nitrogen loading rate of 0.22 +/- 0.03 g N per L per day were operated in a varied temperature range of 7-31 degrees C, with one acting as the experimental reactor and the other as the control. Side-stream sludge treatment with a stepwise elevation of FA concentration (65.2-261.1 mg NH3 L-1) was carried out every day in the experimental reactor; the nitrite accumulation ratio (NAR, (NO2-N/(NO2--N + NO3--N) x 100%)) in the experimental reactor was always about twice that in the control one. Quantitative PCR (q-PCR) and high-throughput sequencing analyses showed the dominant NOB was mostly Nitrobacter, while there was an alternating trend between Nitrobacter and Nitrospira. Even though the whole microbial communities of each experimental stage between the two reactors were relatively clustered due to an incomplete NOB washout, three abundant metabolisms (amino acid metabolism, pyruvate metabolism and nitrogen metabolism) and key functional genes of nitrification predicted by PICRUSt in the experimental reactor were enriched, providing a better understanding of nitrite accumulation. These results have demonstrated that the positive hybrid effects of FA side-stream sludge treatment and a low DO could enhance nitrite accumulation. It is expected that a complete washout of NOB would be achieved after further process optimization.
机译：主流条件下的部分亚硝化是在市政废水处理厂应用脱泥化过程的主要瓶颈之一。该研究旨在评估侧流自由氨（Fa）处理和低溶解氧（0.2 +/- 0.1mg L-1）对抑制亚硝酸盐氧化细菌（NOB）的长期氧化积累的组合效应实验室规模实验。两种连续的絮凝反应器处理低强度合成废水（60mg N-NH4 + L-1，没有COD），每天每晚0.22 +/- 0.03g n的固定氮气加载速率在7个变化的温度范围内运行-31℃，一种用作实验反应器，另一种是对照。在实验反应器中每天进行逐步升高的侧流污泥处理（65.2-261.1mg NH 3 L-1）;实验反应器中的亚硝酸盐累积比（NAR，（NAR2-N + NO 3 - N）×100％）总是在对照中的两倍。定量PCR（Q-PCR）和高通量测序分析显示了显性的NOB大多是氮杆菌，而氮杆菌和氮血管之间存在交替趋势。尽管两种反应器之间的每个实验阶段的整个微生物阶段由于不完全的nob冲洗而相对聚类，但是在实验中，三种丰富的代谢（氨基酸代谢，丙酮酸代谢和氮代谢）和硝化的关键官能基因，在实验中预测反应器富集，提供了更好地理解亚硝酸盐积累。这些结果表明，FA侧流污泥处理和低确实的正杂化效应可以增强亚硝酸盐积累。预计将在进一步处理优化后实现完整的NOB的净化。

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  • 来源
    《RSC Advances》 |2020年第4期|共11页
  • 作者

    Yu Heng; Tian Zhiyong; Zuo Jiane; Song Yonghui;

  • 作者单位

    Tsinghua Univ Sch Environm State Key Joint Lab Environm Simulat &

    Pollut Con Beijing 100084 Peoples R China;

    Chinese Res Inst Environm Sci Dept Urban Water Environm Res State Key Lab Environm Criteria &

    Risk Assessment Beijing 100012 Peoples R China;

    Tsinghua Univ Sch Environm State Key Joint Lab Environm Simulat &

    Pollut Con Beijing 100084 Peoples R China;

    Chinese Res Inst Environm Sci Dept Urban Water Environm Res State Key Lab Environm Criteria &

    Risk Assessment Beijing 100012 Peoples R China;

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  • 中图分类 化学;
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