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首页> 外文期刊>Environmental Science & Technology >Reducing N_2O Emission from a Domestic-Strength Nitrifying Culture by Free Nitrous Acid-Based Sludge Treatment
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Reducing N_2O Emission from a Domestic-Strength Nitrifying Culture by Free Nitrous Acid-Based Sludge Treatment

机译：游离亚硝酸基污泥处理降低家庭强度硝化培养中的N_2O排放

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摘要

An increase of nitrite in the domestic-strength range is generally recognized to stimulate nitrous oxide (N_2O) production by ammonia-oxidizing bacteria (AOB). It was found in this study, however, that N_2O emission from a mainstream nitritation system (cyclic nitrite = 2S-45 mg of N/L) that was established by free nitrous acid (FNA)-based sludge treatment was not higher but much lower than that from the initial nitrifying system with full conversion of NH_4~+-N to NO_3~--N. Under dissolved oxygen (DO) levels of 2.5-3.0 mg/L, N_2O emission from the nitritation stage was 7696 lower than that from the initial stage. Even when the DO level was reduced to 0.3-0.8 mg/L, N_2O emission from the nitritation stage was still 40% lower. An investigation of the mechanism showed that FNA treatment caused a shift of the stimulation threshold of nitrite on N_2O emission. At the nitritation stage, the maximal N_2O emission factor occurred at ～16 mg of N/(L of nitrite). However, it increased with increasing nitrite in the range of 0-56 mg of N/L at the initial stage. FNA treatment decreased the biomass- specific N_2O production rate, suggesting that the enzymes relevant to nitrifier denitrification were inhibited. Microbial analysis revealed that FNA treatment decreased the microbial community diversity but increased the abundances of AOB and denitrifiers.
机译：人们普遍认为，亚硝酸盐在国内强度范围内的增加会刺激氨氧化细菌（AOB）产生一氧化二氮（N_2O）。然而，在这项研究中发现，通过基于亚硝酸（FNA）的污泥处理建立的主流硝化系统（循环亚硝酸盐= 2S-45 mg N / L）的N_2O排放并不高，但要低得多。比最初硝化系统的NH_4〜+ -N完全转化为NO_3〜--N的情况要好。在溶解氧（DO）为2.5-3.0 mg / L的情况下，硝化阶段的N_2O排放比初始阶段的排放低7696。即使将DO含量降低至0.3-0.8 mg / L，硝化阶段的N_2O排放仍要低40％。对机理的研究表明，FNA处理导致亚硝酸盐对N_2O排放的刺激阈值发生了变化。在硝化阶段，最大N_2O排放因子出现在〜16 mg N /（L亚硝酸盐）。但是，它在初始阶段随亚硝酸盐含量的增加（在N / L范围为0-56 mg）而增加。 FNA处理降低了生物量特异性N_2O的产生速率，表明与硝化器反硝化有关的酶受到抑制。微生物分析表明，FNA处理降低了微生物群落多样性，但增加了AOB和反硝化剂的丰度。

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  • 来源
    《Environmental Science & Technology》 |2016年第14期|7425-7433|共9页
  • 作者

    Dongbo Wang; Qilin Wang; Andrew Elohim Laloo; Zhiguo Yuan;

  • 作者单位

    Advanced Water Management Centre (AWMC), The University of Queensland, Brisbane, QLD 4072, Australia;

    Advanced Water Management Centre (AWMC), The University of Queensland, Brisbane, QLD 4072, Australia;

    Advanced Water Management Centre (AWMC), The University of Queensland, Brisbane, QLD 4072, Australia;

    Advanced Water Management Centre (AWMC), 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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  • 正文语种 eng
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