Using static magnetic field to recover ammonia efficiently by DNRA process

IF 10.4 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Yuyang Xie, Zhibin Wang, Shou-Qing Ni
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Abstract

Dissimilatory nitrate reduction to ammonium (DNRA) has garnered attention due to its ability to recover ammonia and reduce greenhouse gas emissions simultaneously. In this study, the potential of using static magnetic field (SMF) to improve DNRA process was explored from the sight of molecular biology. Functional genes, microbial community structure, and metabolism pathways were discussed. SMF of 40 mT shortened the start-up time of DNRA from 75 days to 41 days, while 80 mT SMF delayed it to 103 days. On day 80, DNRA potential rate under 40 mT SMF, reached 174 ± 11 μmol kg−1 h−1, significantly surpassing 0 mT (88 ± 6 μmol kg−1 h−1) and 80 mT SMF (52 ± 4 μmol kg−1 h−1). SMF of 40 mT also accelerated community succession and the enrichment of functional bacteria like Geobacter (from 15.71% to 32.11%). qPCR results suggested that 40 mT SMF promoted the rapid enrichment of DNRA functional gene nrfA and 80 mT SMF promoted the enrichment of nirS gene on day 40. Dynamic responses of Thauera sp. RT1901, Stutzerimonas stutzeri, Shewanella oneidensis MR-1, and Shewanella loihica PV-4 to SMF at transcriptional levels confirmed SMF could improve the nitrogen removal and electron transfer of DNRA and denitrification bacteria. Consequently, this work validated the possibility of using SMF to improve DNRA process for ammonia recovery and investigated the underlying mechanisms, which could promote the application of DNRA in full-scale.

Abstract Image

Abstract Image

利用静磁场通过 DNRA 工艺高效回收氨气
异氨硝酸盐还原成铵(DNRA)因其能够同时回收氨和减少温室气体排放而备受关注。本研究从分子生物学角度探讨了利用静态磁场(SMF)改善 DNRA 过程的潜力。研究讨论了功能基因、微生物群落结构和代谢途径。40 mT 的 SMF 将 DNRA 的启动时间从 75 天缩短到 41 天,而 80 mT 的 SMF 则将 DNRA 的启动时间延迟到 103 天。在第 80 天,40 mT SMF 下的 DNRA 潜能率达到 174 ± 11 μmol kg-1 h-1,明显超过 0 mT(88 ± 6 μmol kg-1 h-1)和 80 mT SMF(52 ± 4 μmol kg-1 h-1)。qPCR 结果表明,在第 40 天,40 mT SMF 促进了 DNRA 功能基因 nrfA 的快速富集,80 mT SMF 促进了 nirS 基因的富集。Thauera sp. RT1901、Stutzerimonas stutzeri、Shewanella oneidensis MR-1 和 Shewanella loihica PV-4 在转录水平上对 SMF 的动态响应证实,SMF 可提高 DNRA 和反硝化细菌的脱氮和电子传递能力。因此,这项工作验证了使用 SMF 改善 DNRA 过程以回收氨氮的可能性,并研究了其潜在机制,这将促进 DNRA 的全面应用。
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来源期刊
npj Clean Water
npj Clean Water Environmental Science-Water Science and Technology
CiteScore
15.30
自引率
2.60%
发文量
61
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.
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