Metagenomics illuminated the mechanism of enhanced nitrogen removal and vivianite recovery induced by zero-valent iron in partial-denitrification/anammox process

Dou, Quanhao; Zhang, Li; Lan, Shuang; Hao, Shiwei; Guo, Wei; Sun, Qingxuan; Wang, Yueping; Peng, Yongzhen; Wang, Xiayan; Yang, Jiachun

doi:10.1016/j.biortech.2022.127317

Cited by 28 publications

(3 citation statements)

References 46 publications

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“…For example, the strategy of elevating maghemite NP concentrations or increasing influent pH had been confirmed to enhance electron consumption to improve nitrogen removal in the PD/A process or the PD system and this A-PDHA system, respectively. 15,41 Therefore, these suitable conditions that could potentially promote the electron flow were proposed in this research as optimization strategies. And they can be used for subsequent applications for improving the nitrogen removal performance in the coupling system centered on anammox technology.…”

Section: Nitrogen Removal Mechanism and Environmental Significancementioning

confidence: 99%

Multi-Omics Analysis Reveals the Nitrogen Removal Mechanism Induced by Electron Flow during the Start-up of the Anammox-Centered Process

Zhang

Hao

Dou

et al. 2022

Environ. Sci. Technol.

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Significant progress in understanding the key enzymes or species of anammox has been made; however, the nitrogen removal mechanism in complex coupling systems centered on anammox remains limited. In this study, by the combination of metagenomics−metatranscriptomics analyses, the nitrogen removal in the anammox-centered coupling system that entails partial denitrification (PD) and hydrolytic acidification (HA, A-PDHA) was elucidated to be the nitrogen transformation driven by the electron generation−transport−consumption process. The results showed that a total nitrogen (TN) removal efficiency of >98%, with a TN effluence of <1 mg/L and a TN removal contribution via anammox of >98%, was achieved after 59 days under famine operation and alkaline conditions during the start-up process. Further investigation confirmed that famine operation promoted the activity of genes responsible for electron generation in anammox, and increased the abundance or expression of genes related to electron consumption. Alkaline conditions enhanced the electron generation for PD by upregulating the activity of glyceraldehyde 3-phosphate dehydrogenase and strengthened electron transfer by increasing the gene encoding quinone pool. Altogether, these variations in the electron flow led to efficient nitrogen removal. These results improve our understanding of the nitrogen removal mechanism and application of the anammox-centered coupling systems in treating nitrogen wastewater.

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Section: Nitrogen Removal Mechanism and Environmental Significancementioning

confidence: 99%

Multi-Omics Analysis Reveals the Nitrogen Removal Mechanism Induced by Electron Flow during the Start-up of the Anammox-Centered Process

Zhang

Hao

Dou

et al. 2022

Environ. Sci. Technol.

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“…Zero-valent iron (ZVI) with its high reduction, non-toxicity, costeffectiveness, and reliability has been widely used in wastewater treatment. [1][2][3][4] In recent years, the bio-ZVI process was developed by combining ZVI and biological processing for eliminating contaminants from wastewater. 5,6 ZVI can degrade contaminants directly.…”

Section: Introductionmentioning

confidence: 99%

Degradation of different wastewater by a biological sponge iron system: microbial growth and influencing factors

Xie,

Zhao,

et al. 2024

RSC Adv.

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“…1 In the development of this coupled process, extraneous organic carbon (C-org; e.g., ethanol and acetate) must be added to ensure the seamlessness of N transformation, 2 which increases the input costs, technical pressure, and risk of secondary pollution. Further, the undulation of C-org dosage in sewage also weakens the NO 2 − -N accumulation of PD period and induces inefficient NH 4 + -N removal via anammox, 3,4 which has been a major impediment in total nitrogen (TN) removal in practical applications. Given the concept of sustainable development, it is important to bend the issue of complete organic dependence of traditional PD/A systems.…”

Section: Introductionmentioning

confidence: 99%

Multipathway of Nitrogen Metabolism Revealed by Genome-Centered Metatranscriptomics from Pyrite-Guided Mixotrophic Partial Denitrification/Anammox Installations

Dou,

Yang,

Peng

et al. 2023

Environ. Sci. Technol.

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Metagenomics illuminated the mechanism of enhanced nitrogen removal and vivianite recovery induced by zero-valent iron in partial-denitrification/anammox process

Cited by 28 publications

References 46 publications

Multi-Omics Analysis Reveals the Nitrogen Removal Mechanism Induced by Electron Flow during the Start-up of the Anammox-Centered Process

Multi-Omics Analysis Reveals the Nitrogen Removal Mechanism Induced by Electron Flow during the Start-up of the Anammox-Centered Process

Degradation of different wastewater by a biological sponge iron system: microbial growth and influencing factors

Multipathway of Nitrogen Metabolism Revealed by Genome-Centered Metatranscriptomics from Pyrite-Guided Mixotrophic Partial Denitrification/Anammox Installations

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