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首页> 外文期刊>Environmental Science & Technology >Robust Nitritation Sustained by Acid-Tolerant Ammonia-Oxidizing Bacteria
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Robust Nitritation Sustained by Acid-Tolerant Ammonia-Oxidizing Bacteria

机译：耐酸性氨氧化细菌持续耐受耐亚硝酸盐

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Oxidation of ammonium to nitrite rather than nitrate, i.e., nitritation, is critical for autotrophic nitrogen removal. This study demonstrates a robust nitritation process in treating low-strength wastewater, obtained from a mixture of real mainstream sewage with sidestream anaerobic digestion liquor. This is achieved through cultivating acid-tolerant ammonia-oxidizing bacteria (AOB) in a laboratory nitrifying bioreactor at pH 4.5-5.0. It was shown that nitrite accumulation with a high NO_2~-/(NO_2~- + NO_3~-) ratio of 95 ± 5% was stably maintained for more than 300 days, and the obtained volumetric NH_4~+ removal rate (i.e., 188 ± 14 mg N L~(-1)d~(-1)) was practically useful. 16S rRNA gene sequencing analyses indicated the dominance of new AOB, "Candidatus Nitrosoglobus," in the nitrifying guild (i.e., 1.90 ± 0.08% in the total community), with the disappearance of typical activated sludge nitrifying microorganisms, including Nitrosomonas, Nitrospira, and Nitrobacter. This is the first identification of Ca. Nitrosoglobus as key ammonia oxidizers in a wastewater treatment system. It was found that Ca. Nitrosoglobus can tolerate low pH (＜5.0), and free nitrous acid (FNA) at levels that inhibit AOB and nitrite-oxidizing bacteria (NOB) commonly found in wastewater treatment processes. The in situ inhibition of NOB leads to accumulation of nitrite (NO_2~-), which along with protons (H~+) also produced in ammonium oxidation generates and sustains FNA at 3.0 ± 1.4 mg HNO_2N L~-(-1). As such, robust PN was achieved under acidic conditions, with a complete absence of NOB. Compared to previous nitritation systems, this acidic nitritation process is featured by a higher nitric oxide (NO) but a lower nitrous oxide (N_2O) emission level, with the emission factors estimated at 1.57 ± 0.08 and 0.57 ± 0.03%, respectively, of influent ammonium nitrogen load.
机译：铵亚硝酸盐而不是硝酸盐，即，亚硝化的氧化，为自养脱氮关键的。这项研究表明，在处理低浓度废水，从与侧流厌氧消化酒真实主流污水的混合物而获得的稳健亚硝化过程。这是通过在pH 4.5-5.0培养在实验室生物反应器硝化酸耐受性氨氧化细菌（AOB）来实现的。结果表明，具有高NO_2〜亚硝酸盐积累 - /（NO_2〜 - + NO_3〜 - ）的95±5％的比例被稳定地保持为超过300天，得到的体积NH_4〜+移除速率（即，188 ±14毫克NL〜（-1）d〜（-1））是实际有用的。 16S rRNA基因测序分析在硝化公会指示新AOB，的主导地位“暂定Nitrosoglobus，”（即，在总群落1.90±0.08％），具有典型的活性污泥的硝化微生物，包括亚硝化，硝化螺菌属的消失，和硝化。这是Ca的第一识别Nitrosoglobus如在废水处理系统中的关键氨氧化剂。发现该CA Nitrosoglobus可以容忍的水平低pH值（<5.0），和游离亚硝酸（FNA）抑制AOB和亚硝酸氧化细菌（NOB）在废水处理过程中常见的。原位抑制NOB引线的亚硝酸盐的累积（NO_2〜 - ），其连同质子（H〜+）也在氧化铵产生产生并在3.0±1.4毫克HNO_2N L〜维持FNA - （ - 1）。这样，鲁棒PN在酸性条件下实现，具有完全没有NOB的。相比于以前的亚硝化系统，此酸性亚硝化过程是由较高的一氧化氮（NO），但较低的一氧化二氮（N_2O）发射电平功能，估计在分别1.57±0.08和0.57±0.03％时，排放因素，进水铵氮负荷。

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  • 来源
    《Environmental Science & Technology》 |2021年第3期|2048-2056|共9页
  • 作者

    Zhiyao Wang; Min Zheng; Jia Meng; Zhetai Hu; Gaofeng Ni; Angelica Guerrero Calderon; Huijuan Li; Haydee De Clippeleir; Ahmed Al-Omari; Shihu Hu; Zhiguo Yuan;

  • 作者单位

    Advanced Water Management Centre The University of Queensland Brisbane QLD 4072 Australia;

    Advanced Water Management Centre The University of Queensland Brisbane QLD 4072 Australia;

    Advanced Water Management Centre The University of Queensland Brisbane QLD 4072 Australia State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150090 P. R. China;

    Advanced Water Management Centre The University of Queensland Brisbane QLD 4072 Australia;

    Advanced Water Management Centre The University of Queensland Brisbane QLD 4072 Australia;

    Advanced Water Management Centre The University of Queensland Brisbane QLD 4072 Australia;

    Advanced Water Management Centre The University of Queensland Brisbane QLD 4072 Australia;

    DC Water Washington District of Columbia 20032 United States;

    DC Water Washington District of Columbia 20032 United States;

    Advanced Water Management Centre The University of Queensland Brisbane QLD 4072 Australia;

    Advanced Water Management Centre The University of Queensland Brisbane QLD 4072 Australia;

  • 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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