Aerobic Denitrification Enhanced by Immobilized Slow-Released Iron/Activated Carbon Aquagel Treatment of Low C/N Micropolluted Water: Denitrification Performance, Denitrifying Bacterial Community Co-occurrence, and Implications,Environmental Science & Technology

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Aerobic Denitrification Enhanced by Immobilized Slow-Released Iron/Activated Carbon Aquagel Treatment of Low C/N Micropolluted Water: Denitrification Performance, Denitrifying Bacterial Community Co-occurrence, and Implications
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-03-21 , DOI: 10.1021/acs.est.2c08770
Ben Ma _{1,

2} , Haihan Zhang _{1,

2} , Tinglin Huang _{1,

2} , Shengnan Chen _{1,

2} , Weimin Sun _{3,

4} , Wanqiu Yang _{1,

2} , Limin Niu _{1,

2} , Xiang Liu _{1,

2} , Hanyan Liu _{1,

2} , Sixuan Pan _{1,

2} , Huan Liu _{1,

2} , Xiaoli Zhang _{1,

2}

Affiliation

The key limiting factors in the treatment of low C/N micropolluted water bodies are deficient essential electron donors for nitrogen removal processes. An iron/activated carbon aquagel (IACA) was synthesized as a slowly released inorganic electron donor to enhance aerobic denitrification performance in low C/N micropolluted water treatment. The denitrification efficiency in IACA reactors was enhanced by more than 56.72% and the highest of 94.12% was accomplished compared with those of the control reactors. Moreover, the COD_Mn removal efficiency improved by more than 34.32% in IACA reactors. The Illumina MiSeq sequencing consequence explained that the denitrifying bacteria with facultative denitrification, iron oxidation, and iron reduction function were located in the dominant species niches in the IACA reactors (e.g., Pseudomonas, Leptothrix, and Comamonas). The diversity and richness of the denitrifying bacterial communities were enhanced in the IACA reactors. Network analysis indicated that aerobic denitrifying bacterial consortia in IACA reactors presented a more complicated co-occurrence structure. The IACA reactors presented the potential for long-term denitrification operation. This study affords a pathway to utilize IACA, promoting aerobic denitrification during low C/N micropolluted water body treatment.

中文翻译：

固定化缓释铁/活性炭水凝胶处理低 C/N 微污染水增强好氧反硝化作用：反硝化性能、反硝化细菌群落共生及其意义

处理低 C/N 微污染水体的关键限制因素是脱氮过程中必需的电子供体不足。合成了铁/活性炭水凝胶 (IACA) 作为缓慢释放的无机电子供体，以增强低 C/N 微污染水处理中的好氧反硝化性能。与对照反应器相比，IACA反应器的脱硝效率提高了56.72%以上，最高达到94.12%。此外，COD _MnIACA 反应器的去除效率提高了 34.32% 以上。Illumina MiSeq 测序结果解释了具有兼性反硝化、铁氧化和铁还原功能的反硝化细菌位于 IACA 反应器中的优势物种生态位（例如，假单胞菌、纤丝菌和毛单胞菌）). IACA 反应器中反硝化细菌群落的多样性和丰富度得到了增强。网络分析表明，IACA反应器中的好氧反硝化菌群呈现出更复杂的共生结构。IACA 反应器具有长期反硝化运行的潜力。本研究提供了一种利用 IACA 的途径，在低 C/N 微污染水体处理过程中促进好氧反硝化。

更新日期：2023-03-21

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