Achieving high nitrogen and antibiotics removal efficiency by nZVI-C in partial nitritation/anammox system with a single-stage membrane-aerated biofilm reactor,Journal of Hazardous Materials

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Achieving high nitrogen and antibiotics removal efficiency by nZVI-C in partial nitritation/anammox system with a single-stage membrane-aerated biofilm reactor
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-05-15 , DOI: 10.1016/j.jhazmat.2024.134626
Zixuan Song ₁ , Li Zhang ₁ , Jiachun Yang ₂ , Shou-Qing Ni ₃ , Yongzhen Peng ₁

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This study innovated constructed an activated carbon-loaded nano-zero-valent iron (nZVI-C) enhanced membrane aerated biofilm reactor (MABR) coupled partial nitritation/anammox (PN/A) system for optimizing nitrogen and antibiotics removal. Results showed that nitrogen and antibiotic removal efficiencies of 88.45 ± 0.14% and 89.90 ± 3.07% were obtained by nZVI-C, respectively. nZVI-C hastened enrichment (relative abundance raised from 2.85% to 12.28%) by increasing tryptophan content in EPS. Furthermore, nZVI-C proliferated amo gene by 3.92 times and directly generated electrons, stimulating Ammonia monooxygenase (AMO) co-metabolism activity. Concurrently, via antibiotic resistance genes (ARGs) horizontal transfer, synergized with and for efficient antibiotic removal. Moreover, nZVI-C mitigated antibiotics inhibition of electron transfer by proliferating genes for PN and anammox electron production (hao, hdh) and utilization (amo, hzs, nir). That facilitated electron transfer and synergistic substrate conversion between ammonia oxidizing bacteria (AOB) and anaerobic ammonia oxidizing bacteria (AnAOB). Finally, the high nitrogen removal efficiency of the MABR-PN/A system was achieved.

中文翻译：

使用单级膜曝气生物膜反应器在部分亚硝化/厌氧氨氧化系统中使用 nZVI-C 实现高氮和抗生素去除效率

本研究创新性地构建了活性炭负载的纳米零价铁（nZVI-C）增强膜曝气生物膜反应器（MABR）耦合部分亚硝化/厌氧氨氧化（PN/A）系统，以优化氮和抗生素的去除。结果表明，nZVI-C 的氮和抗生素去除效率分别为 88.45 ± 0.14% 和 89.90 ± 3.07%。 nZVI-C 通过增加 EPS 中的色氨酸含量来加速富集（相对丰度从 2.85% 提高到 12.28%）。此外，nZVI-C使amo基因增殖3.92倍并直接产生电子，刺激氨单加氧酶（AMO）共代谢活性。同时，通过抗生素抗性基因（ARG）水平转移，与抗生素协同作用并有效去除抗生素。此外，nZVI-C 通过增殖 PN 和厌氧氨氧化电子产生（hao、hdh）和利用（amo、hzs、nir）的基因来减轻抗生素对电子转移的抑制。这促进了氨氧化细菌（AOB）和厌氧氨氧化细菌（AnAOB）之间的电子转移和协同底物转化。最终实现了MABR-PN/A系统的高脱氮效率。

更新日期：2024-05-15

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