Enhanced nitrogen removal by partial nitrification-anammox process with a novel high-frequency micro-aeration (HFMA) mode: Metabolic interactions among functional bacteria

Chi, Yulei; Shi, Xuan; Jin, Pengkang; Wang, Xiaochang C.; Ren, Tong; Ren, Bo; Jin, Xin

doi:10.1016/j.biortech.2021.125917

Cited by 13 publications

(3 citation statements)

References 37 publications

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“…Under optimal conditions suspended sludge becomes a source of nitrite, while biofilm becomes a nitrite sink and successfully suppresses NOB. Chi et al ( 2021 ) proposed a novel high‐frequency micro‐aeration (HFMA) mode (aeration frequency 15 times/h, DO ≤0.5 mg/L) that enhanced the PNA performance of the IFAS‐SBR reactor, and the HFMA conditions enhanced the expression of AnAOB with NH 2 OH as an intermediate metabolite and the material exchange of functional microorganisms. Thus, the nitrite accumulation rate, denitrification efficiency, and AnAOB abundance of the reactor were improved (20.88%, 20.11%, and 5.92% increase, respectively).…”

Section: Factors Affecting the Denitrification Process Of Ifasmentioning

confidence: 99%

Research progress of anaerobic ammonium oxidation (Anammox) process based on integrated fixed‐film activated sludge (IFAS)

Li,

Yu,

et al. 2024

Environ Microbiol Rep

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The integrated fixed‐film activated sludge (IFAS) process is considered one of the cutting‐edge solutions to the traditional wastewater treatment challenges, allowing suspended sludge and attached biofilm to grow in the same system. In addition, the coupling of IFAS with anaerobic ammonium oxidation (Anammox) can further improve the efficiency of biological denitrification. This paper summarises the research progress of IFAS coupled with the anammox process, including partial nitrification anammox, simultaneous partial nitrification anammox and denitrification, and partial denitrification anammox technologies, and describes the factors that limit the development of related processes. The effects of dissolved oxygen, influent carbon source, sludge retention time, temperature, microbial community, and nitrite‐oxidising bacteria inhibition methods on the anammox of IFAS are presented. At the same time, this paper gives an outlook on future research focus and engineering practice direction of the process.

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Section: Factors Affecting the Denitrification Process Of Ifasmentioning

confidence: 99%

Research progress of anaerobic ammonium oxidation (Anammox) process based on integrated fixed‐film activated sludge (IFAS)

Li,

Yu,

et al. 2024

Environ Microbiol Rep

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“…AOB shows stronger hypoxic affinity and doubling rate than nitrate-oxidizing bacteria (NOB). By controlling DO concentration in the reactor, selective amplification of AOB and elimination of NOB can be achieved progressively [21,22]. NO 2 − -N accumulated due to partial nitrification flowed back to the anaerobic and anoxic zones and was rapidly utilized by AnAOB.…”

Section: Performance Of Nitrogen Removal Under Different Reflux Ratiosmentioning

confidence: 99%

Analysis of the Partial Nitrification/Anammox Performance and Microbial Structure of Low C/N Wastewater by A2/O Process

Zhou

Tang

et al. 2023

Water

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Given the carbon limitation of low C/N wastewater, the improvement of nitrogen-removal efficiency remains a challenging task of municipal wastewater treatment plants (WWTPs) in China. In this study, a partial nitrification/anammox (PN/A) system was established to facilitate the anaerobic-anoxic-aerobic (A2/O) treatment of low C/N (C/N = 3) wastewater with insufficient carbon sources. Effects of dissolved oxygen (DO) concentration and internal reflux ratio on nitrogen-removal efficiency and pathway were investigated. Under the optimal DO (0.5–0.8 mg·L−1) and internal reflux ratio (250%), the highly efficient NH4+-N removal (97.21%) and TN removal (80.92%) were achieved based on PN/A. Moreover, the relative abundance of ammonia-oxidizing bacteria (Nitrosomonas) was 3 times higher than the abundance of nitrite-oxidizing bacteria (Nitrospira) in phase V, which was the main cause of PN in the reactor. Anaerobic ammonia-oxidizing bacteria (Candidatus Brocadia, Pirellula, and Gemmata) were also found and considered as the key microbes involved in anammox. This study reports that the A2/O process can achieve advanced nitrogen removal of low C/N wastewater based on PN/A by optimizing conventional process parameters. The outcomes of this study may provide practical engineering applications as a reference for nitrogen removal based on the A2/O process.

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“…5A). Previous studies have found that nitrogen metabolism was closely coupled to carbon xation, which signi cantly in uenced nitrogen transformation in partial nitri cation-anammox process [47]. AnAOB could complete the Wood-Ljungdahl pathway to transform inorganic carbon into organic carbon, in which Mo(VI) is involved in the hydrogen transfer process in NADH [48].…”

Section: Different Nitrogen Metabolism Responses Of B and K Anaob To Fqsmentioning

confidence: 99%

An integrated meta-omics approach reveals the different response mechanisms of two anammox bacteria towards fluoroquinolone antibiotics

Qiao,

Yu,

Ding

et al. 2023

Preprint

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Background: The emerging fluoroquinolone antibiotics (FQs) are highly influential in nitrogen removal from livestock wastewater. However, beyond the capability of nitrogen removal, little is known about the molecular mechanism (e.g., shift of core metabolism and energy allocation) of anaerobic ammonium-oxidizing bacteria(AnAOB) under continuous FQ stress. Results: This study investigated the effectsof ciprofloxacin, ofloxacin and their mixture at concentrations detected in livestock wastewater on an anammox community in membrane bioreactors.It was found 20 μg/L FQs promoted nitrogen removal efficiency and community stability. Integrated meta-omics analysis revealed varied gene expression patterns between the two dominant AnAOB, Candidatus Brocadia sapporoensis (B AnAOB) and Candidatus Kuenenia stuttgartiensis (K AnAOB). The nitrogen metabolic processes were bolstered in B AnAOB, while those involved in anammox pathway of K AnAOB were inhibited. This difference was tentatively attributed to the up-regulation of reactive oxygen species scavenger genes (ccp and dxf) and FQ resistance gene (qnrB72) in B AnAOB. Importantly, most enhanced core biosynthesis/metabolism and close cross-feeding of B AnAOB with accompanying bacteria were also likely to contribute to higher levels of biomass yield and metabolism activity under FQ stress. Conclusions: This finding suggests that B AnAOB has the advantage of higher nitrogen metabolism capacity over K AnAOB in livestock wastewater containing FQs, which is helpful for efficient and stable nitrogen removal by anammox community.

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Enhanced nitrogen removal by partial nitrification-anammox process with a novel high-frequency micro-aeration (HFMA) mode: Metabolic interactions among functional bacteria

Cited by 13 publications

References 37 publications

Research progress of anaerobic ammonium oxidation (Anammox) process based on integrated fixed‐film activated sludge (IFAS)

Research progress of anaerobic ammonium oxidation (Anammox) process based on integrated fixed‐film activated sludge (IFAS)

Analysis of the Partial Nitrification/Anammox Performance and Microbial Structure of Low C/N Wastewater by A2/O Process

An integrated meta-omics approach reveals the different response mechanisms of two anammox bacteria towards fluoroquinolone antibiotics

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