...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Long-Term Low Dissolved Oxygen Operation Decreases N_2O Emissions in the Activated Sludge Process
【24h】

Long-Term Low Dissolved Oxygen Operation Decreases N_2O Emissions in the Activated Sludge Process

机译：长期低溶解氧操作降低了活性污泥过程中的N_2O排放

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Nitrous oxide (N_2O) is an important greenhouse gas and a dominant ozone-depletingsubstance. Nitrification in the activated sludge process (ASP) is an important N_2O emission source. This study demonstrated that a short-term low dissolved oxygen (DO) increased the N_2O emissions by six times, while long-term low DO operation decreased the N_2O emissions by 54% (P < 0.01). Under long-term low DO, the ammonia oxidizer abundance in the ASP increased significantly, and thus, complete nitrification was recovered and no NH_3 or nitrite accumulated. Moreover, long-term low DO decreased the abundance of ammonia-oxidizing bacteria (AOB) by 28%, while increased the abundance of ammonia-oxidizing archaea (AOA) by 507%, mainly due to their higher oxygen affinity. As a result, AOA outnumbered AOB with the AOA/AOB amoA gene ratio increasing to 19.5 under long-term low DO. The efficient nitrification and decreased AOB abundance might not increase N_2O production via AOB under long-term low DO conditions. The enriched AOA could decrease the N_2O emissions because they were reported to lack canonical nitric oxide (NO) reductase genes that convert NO to N_2O. Probably because of AOA enrichment, the positive and significant (P = 0.02) correlation of N_2O emission and nitrite concentration became insignificant (P = 0.332) after 80 days of low DO operation. Therefore, ASPs can be operated with low DO and extended sludge age to synchronously reduce N_2O production and carbon dioxide emissions owing to lower aeration energy without compromising the nitrification efficiency.
机译：氧化亚氮（N_2O）是一个重要的温室气体和显性臭氧耗尽灌注。活性污泥过程（ASP）中的硝化是重要的N_2O发射源。本研究表明，短期低溶解氧（DO）增加了N_2O排放六次，而长期低电平操作减少了54％（P <0.01）。在长期低下的情况下，ASP中的氨氧化剂丰度显着增加，因此回收完全硝化，累积NH_3或亚硝酸盐。此外，长期低确实将氨氧化细菌（AOB）的丰度降低了28％，同时将氨氧化古亚亚（AOA）的丰度增加了507％，主要是由于它们的氧亲和力较高。结果，AOA以AOA / AOB AmOA基因比率从长期低至19.5的AOA / AOB氨基酰胺比例偏离AOB。高效硝化和降低的AOB丰度可能在长期低做条件下通过AOB增加N_2O生产。富集的AOA可以降低N_2O排放，因为据报道它们缺乏转化为N_2O的规范一氧化氮（NO）还原酶基因。可能是因为AOA富集，阳性和显着（P = 0.02）NORTINE浓度和亚硝酸盐浓度的相关性在低做操作后80天后的微不足道（p = 0.332）。因此，ASPS可以用低做和延伸的污泥时代操作，以同步降低N_2O生产和二氧化碳排放，而不会降低曝气能量而不会影响硝化效率。

著录项

  • 来源
    《Environmental Science & Technology》 |2021年第10期|6975-6983|共9页
  • 作者

    Guoqiang Liu; Xianwei Wu; Deyong Li; Lugao Jiang; Ju Huang; Li Zhuang;

  • 作者单位

    School of Environment Guangdong Engineering Research Center of Water Treatment Processes and Materials and Guangdong Key Laboratory of Environmental Pollution and Health Jinan University Guangzhou 510632 China;

    School of Environment Guangdong Engineering Research Center of Water Treatment Processes and Materials and Guangdong Key Laboratory of Environmental Pollution and Health Jinan University Guangzhou 510632 China;

    School of Environment Guangdong Engineering Research Center of Water Treatment Processes and Materials and Guangdong Key Laboratory of Environmental Pollution and Health Jinan University Guangzhou 510632 China;

    School of Environment Guangdong Engineering Research Center of Water Treatment Processes and Materials and Guangdong Key Laboratory of Environmental Pollution and Health Jinan University Guangzhou 510632 China;

    School of Environment Guangdong Engineering Research Center of Water Treatment Processes and Materials and Guangdong Key Laboratory of Environmental Pollution and Health Jinan University Guangzhou 510632 China;

    School of Environment Guangdong Engineering Research Center of Water Treatment Processes and Materials and Guangdong Key Laboratory of Environmental Pollution and Health Jinan University Guangzhou 510632 China;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    activated sludge; nitrification; nitrous oxide; low dissolved oxygen; ammonia-oxidizing bacteria; ammonia-oxidizing archaea; comammox;

    机译：活性污泥;硝化;笑气;低溶解氧;氨氧化细菌;氨氧化archaea;commmox.;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号