Investigation of Nitrogen Conversion Efficiency in Hydrogen-based Autotrophic Nitrate Reduction Reactor

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 10, 2025

This study investigates the performance of a hydrogen-based membrane biofilm reactor (MBfR) for nitrogen transformation over an extended operational period exceeding 200 days. During monitoring, sustained highly alkaline conditions with pH consistently 11.20, while achieving ammonia conversion efficiency above 60% and maintaining nitrite accumulation rate below 1%. Integrated mass balance calculations microbial community profiling revealed coexistence denitrification dissimilatory nitrate reduction to ammonium (DNRA) pathways within network. A factorial experimental design was implemented hydraulic retention time (HRT) influent concentration as independent variables, generating nine distinct regimes through cross-variable permutations. Subsequent analysis extensive datasets enabled development Response Surface Methodology (RSM) model simulate dynamics. Model validation confirmed statistical reliability predictive accuracy RSM framework. Critical demonstrated that in hydrogen autotrophic system exhibited significant correlation individual variables themselves but showed negligible dependence on their interactive effects. These findings provide novel insights into process optimization strategies theoretical understanding convention.

Language: Английский

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Investigation of nitrogen conversion efficiency in hydrogen-based autotrophic nitrate reduction reactor

Journal of Water Process Engineering, Journal Year: 2025, Volume and Issue: 72, P. 107536 - 107536

Published: March 22, 2025

Language: Английский

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The Effect of Karst Carbonate Rock Dissolution on Nitrogen Metabolism Microorganisms and Their Functions in Paddy Soils

Land, Journal Year: 2025, Volume and Issue: 14(3), P. 553 - 553

Published: March 6, 2025

Carbonate rock dissolution (CRD) in karst areas generates abundant ions, which contribute significantly to nitrogen (N) transformation paddy ecosystems. However, little is known about the microbial mechanisms by CRD ions (Ca2+, Mg2+, HCO3−/CO32−, and OH-) regulate N balance. In this experiment, rice pot studies were conducted using soil (S1), with removed carbonate minerals (S2), non-karst (S3), additional (S4). The effects of on N-metabolizing microorganisms functional genes metabolism investigated metagenomic sequencing technology. Six pathways, including fixation, nitrification, denitrification, dissimilatory nitrate reduction ammonia (DNRA), assimilatory (ANRA), complete nitrification (comammox) revealed. Compared S3, relative abundance denitrification module (M00529) S1 clearly increased 1.52%. Additionally, compared (M00804) S4 decreased 0.66%. Proteobacteria Anaeromyxobacter significant contributors variations metabolism. Key factors that influenced included Ca2+, pH. This study explored functions, was great significance cycle

Language: Английский

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Harnessing Bacterial Potential to Reduce Nitrous Oxide Emissions From Agricultural Soils

Journal of Sustainable Agriculture and Environment, Journal Year: 2025, Volume and Issue: 4(1)

Published: March 1, 2025

ABSTRACT Reducing N₂O emissions from farmlands is crucial to mitigate climate change. A recent scientific breakthrough employed an innovative method inoculate farmland soil with a bacterium, resulting in significant reduction of emissions. This commentary identifies promising environments and practices for further emission reduction.

Language: Английский

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Hotspots and future trends of estuarine nitrogen cycle: A bibliometric review

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 133056 - 133056

Published: March 1, 2025

Language: Английский

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