Long-term operation and dynamic response of dissimilatory nitrate reduction to ammonium process under low-frequency infrared electromagnetic field

IF 10.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

npj Clean Water Pub Date : 2024-07-11 DOI:10.1038/s41545-024-00356-z

Yuyang Xie, Zhibin Wang, Sherif Ismail, Shou-Qing Ni

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Abstract

Dissimilatory nitrate reduction to ammonium (DNRA) received more attention for its ability to recover ammonium. This study investigated the possibility of low-frequency infrared electromagnetic field (IR-EMF) to improve DNRA. The optimal IR-EMF intensity of 0.04 μT could effectively improve DNRA activity of nonwoven fabric membrane bioreactors. In the long-term operation, the average ammonium conversion efficiency was enhanced by 117.7% and 62.5% under 0.04 μT and 0.06 μT IR-EMF, respectively. The highest nrfA-gene abundance and potential DNRA rate were obtained under 0.04 μT IR-EMF exposure. Bacteroidetes fragilis, Shewanelle oneidensis MR-1, and Thauera sp. RT1901 were selected to investigate the dynamic response of nitrogen transformation and energy metabolism to IR-EMF. The transcriptome sequencing and RT-qPCR results suggested that IR-EMF could enhance both denitrification and DNRA process, mainly by improving ATP synthesis to boost metabolic activity. This study provided an efficient method for the nitrogen recovery via DNRA process by applying IR-EMF.

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低频红外电磁场下异嗜硝酸盐还原成氨过程的长期运行和动态响应

溶解性硝酸盐还原成铵（DNRA）因其回收铵的能力而受到更多关注。本研究探讨了低频红外电磁场（IR-EMF）改善 DNRA 的可能性。最佳红外电磁场强度为 0.04 μT，可有效提高无纺布膜生物反应器的 DNRA 活性。在长期运行过程中，0.04 μT和0.06 μT IR-EMF条件下的平均铵转化效率分别提高了117.7%和62.5%。在 0.04 μT IR-EMF 暴露条件下，nrfA 基因丰度和潜在 DNRA 率最高。选择脆弱拟杆菌、Shewanelle oneidensis MR-1和Thauera sp.RT1901研究氮转化和能量代谢对IR-EMF的动态响应。转录组测序和 RT-qPCR 结果表明，IR-EMF 主要通过改善 ATP 合成来提高代谢活性，从而增强反硝化和 DNRA 过程。该研究为利用 IR-EMF 通过 DNRA 过程进行氮回收提供了一种有效方法。

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来源期刊

npj Clean Water Environmental Science-Water Science and Technology

CiteScore

15.30

自引率

2.60%

发文量

审稿时长

5 weeks

期刊介绍： npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.