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New insights into nitrogen removal by divalent iron-enhanced moving bed biofilm reactor: Performance, interfacial interaction and co-occurrence network
Bioresource Technology ( IF 9.7 ) Pub Date : 2024-03-20 , DOI: 10.1016/j.biortech.2024.130621 Mengcheng Sheng 1 , Zhiqing Ye 1 , Fang Zhu 1 , Dandan Pan 1 , Sicheng Shao 1 , Xiangwei Wu 1
Bioresource Technology ( IF 9.7 ) Pub Date : 2024-03-20 , DOI: 10.1016/j.biortech.2024.130621 Mengcheng Sheng 1 , Zhiqing Ye 1 , Fang Zhu 1 , Dandan Pan 1 , Sicheng Shao 1 , Xiangwei Wu 1
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A divalent iron-mediated moving bed biofilm reactor with intermittent aeration was developed to enhance the nitrogen removal at low carbon-to-nitrogen ratios. The study demonstrated thatammonia removal increased from 51 ± 4 % to 79 ± 4 % and nitrate removal increased from 72 ± 5 % to 98 ± 4 % in phases I-IV, and 2–5 mg·L of divalent iron significantly increased the anoxic denitrification process. Divalent iron stimulated the secretion of extracellular polymeric substances, which facilitated the formation of cross-linked network between microbial cells. Furthermore, the cycle between divalent and trivalent iron decreased the energy barrier between the biofilm and the pollutant. The microbial community further revealed that (relative abundance: 40–48 %) and(relative abundance: 31–37 %) were the dominant phyla, supporting the synchronous nitrification and denitrification processes as well as the lower accumulation of nitrite. In conclusion, iron redox cycling significantly enhanced the nitrogen removal. This study proposes a viable strategy for the efficient treatment of nutrient wastewater.
中文翻译：
二价铁增强移动床生物膜反应器脱氮的新见解：性能、界面相互作用和共生网络
开发了一种间歇曝气的二价铁介导的移动床生物膜反应器，以提高低碳氮比下的脱氮效果。研究表明，在 I-IV 阶段，氨去除率从 51 ± 4 % 增加到 79 ± 4 %，硝酸盐去除率从 72 ± 5 % 增加到 98 ± 4 %，并且 2–5 mg·L 的二价铁显着增加缺氧。反硝化过程。二价铁刺激细胞外聚合物的分泌，有利于微生物细胞之间交联网络的形成。此外，二价铁和三价铁之间的循环降低了生物膜和污染物之间的能量势垒。微生物群落进一步揭示，（相对丰度：40-48%）和（相对丰度：31-37%）是优势门，支持同步硝化和反硝化过程以及较低的亚硝酸盐积累。总之，铁氧化还原循环显着增强了氮的去除。这项研究提出了一种有效处理营养废水的可行策略。
更新日期：2024-03-20
中文翻译：
二价铁增强移动床生物膜反应器脱氮的新见解：性能、界面相互作用和共生网络
开发了一种间歇曝气的二价铁介导的移动床生物膜反应器，以提高低碳氮比下的脱氮效果。研究表明，在 I-IV 阶段，氨去除率从 51 ± 4 % 增加到 79 ± 4 %，硝酸盐去除率从 72 ± 5 % 增加到 98 ± 4 %，并且 2–5 mg·L 的二价铁显着增加缺氧。反硝化过程。二价铁刺激细胞外聚合物的分泌，有利于微生物细胞之间交联网络的形成。此外，二价铁和三价铁之间的循环降低了生物膜和污染物之间的能量势垒。微生物群落进一步揭示，（相对丰度：40-48%）和（相对丰度：31-37%）是优势门，支持同步硝化和反硝化过程以及较低的亚硝酸盐积累。总之，铁氧化还原循环显着增强了氮的去除。这项研究提出了一种有效处理营养废水的可行策略。
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