...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Substrate Diffusion within Biofilms Significantly Influencing the Electron Competition during Denitrification
【24h】

Substrate Diffusion within Biofilms Significantly Influencing the Electron Competition during Denitrification

机译：生物膜内的底物扩散会显着影响反硝化过程中的电子竞争

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

A common and long-existing operational issue of wastewater denitrification is the unexpected accumulation of nitrite (NO2-) that could suppress the activity of various microorganisms involved in biological wastewater treatment process and nitrous oxide (N2O) that could emit as a potent greenhouse gas. Recently, it has been confirmed that the accumulation of these denitrification intermediates in biological wastewater treatment process is greatly influenced by the electron competition between the four denitrification steps. However, little is known about this in biofilm systems. In this work, we applied a mathematical model that links carbon oxidation and nitrogen reduction processes through a pool of electron carriers, to assess electron competition in denitrifying biofilms. Simulations were performed comprehensively at seven combinations of electron acceptor addition scheme (i.e., simultaneous addition of one, two or three among nitrate (NO3-), NO2-, and N2O) to compare the effect of electron competition on NO3-, NO2 and N2O reduction. Overall, the effects of substrate loading, biofilm thickness and effective diffusion coefficients on electron competition are not always intuitive. Model simulations show that electron competition was intensified due to the substrate load limitation (from 120 to 20 mg COD/L) and increasing biofilm thicknesses (from 0.1 to 1.6 mm) in most cases, where electrons were prioritized to nitrite reductase because of the insufficient electron donor availability in the biofilm. In contrast, increasing effective diffusion coefficients did not pose a significant effect on electron competition and only increased electrons distributed to nitrite reductase when both NO2- and N2O are added.
机译：废水反硝化的一个普遍存在且长期存在的操作问题是亚硝酸盐（NO2-）的意外积累，它会抑制参与生物废水处理过程的各种微生物的活动，而一氧化二氮（N2O）可能会释放出强大的温室气体。最近，已经证实，这些反硝化中间体在生物废水处理过程中的积累受到四个反硝化步骤之间的电子竞争的极大影响。然而，在生物膜系统中对此知之甚少。在这项工作中，我们应用了一个数学模型，该模型通过一组电子载体将碳氧化和氮还原过程联系起来，以评估反硝化生物膜中的电子竞争。在七个电子受体添加方案的组合（即同时在硝酸盐（NO3-），NO2-和N2O中同时添加一个，两个或三个）中进行了全面模拟，以比较电子竞争对NO3-，NO2和N2O的影响减少。总体而言，底物负载，生物膜厚度和有效扩散系数对电子竞争的影响并不总是直观的。模型仿真表明，由于底物负载限制（从120到20 mg COD / L）和增加的生物膜厚度（从0.1到1.6 mm），在大多数情况下电子竞争加剧，其中由于电子不足，电子优先于亚硝酸还原酶生物膜中电子供体的可用性。相反，当同时添加NO2-和N2O时，增加有效扩散系数不会对电子竞争产生显着影响，而只会增加分配给亚硝酸还原酶的电子。

著录项

  • 来源
    《Environmental Science & Technology》 |2019年第1期|261-269|共9页
  • 作者

    Pan Yuting; Liu Yiwen; Peng Lai; Ngo Huu Hao; Guo Wenshan; Wei Wei; Wang Dongbo; Ni Bing-Jie;

  • 作者单位

    Sichuan Univ, Coll Architecture & Environm, Dept Environm Sci & Engn, Chengdu 610065, Sichuan, Peoples R China;

    Univ Technol Sydney, Sch Civil & Environm Engn, Ctr Technol Water & Wastewater, Sydney, NSW 2007, Australia;

    Wuhan Univ Technol, Sch Resources & Environm Engn, Luoshi Rd 122, Wuhan 430070, Hubei, Peoples R China;

    Univ Technol Sydney, Sch Civil & Environm Engn, Ctr Technol Water & Wastewater, Sydney, NSW 2007, Australia;

    Univ Technol Sydney, Sch Civil & Environm Engn, Ctr Technol Water & Wastewater, Sydney, NSW 2007, Australia;

    Univ Technol Sydney, Sch Civil & Environm Engn, Ctr Technol Water & Wastewater, Sydney, NSW 2007, Australia;

    Hunan Univ, Coll Environm Sci & Engn, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China;

    Univ Technol Sydney, Sch Civil & Environm Engn, Ctr Technol Water & Wastewater, Sydney, NSW 2007, 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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