Recent progress in applications of Feammox technology for nitrogen removal from wastewaters: A review

Xia, Qing; Ai, Ziyin; Huang, Wenli; Liu, Fei; Lei, Zhongfang; Huang, Weiwei

doi:10.1016/j.biortech.2022.127868

Cited by 36 publications

(14 citation statements)

References 81 publications

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“…On day 28, the NH 4 + -N concentrations were 220.1, 215.2, and 211.0 mg/L in the Fe(III)-AE5, Fe(III)-AE10, and Fe(III)-AE15 groups, respectively. Feammox is an anoxic process, and a low level of DO favors the reactions . Yao et al observed a quick decline in the Feammox rate at a DO level above 1.0 mg/L .…”

Section: Resultsmentioning

confidence: 99%

“…From the experimental results in this work, it was hypothesized that although a sufficient amount of Fe(III) was a prerequisite for the Feammox process, the removal of NH 4 + -N was restricted by the slow Feammox reaction rate. In a review by Xia et al, the N removal rates of nitrification-denitrification, Anammox, and partial denitrification-Anammox were calculated to be 21–58, 106–876, and 310–730 N/m 3 /day, respectively . Compared with these N removal processes, the reaction rate of Feammox is much slower.…”

Section: Resultsmentioning

confidence: 99%

“…After day 8, the NO 3 – -N concentrations in the four reactors dropped quickly to below 3.0 mg/L by day 20 and leveled off after that, confirming the occurrence of some biological or biochemical NO 3 – -N removal processes like denitrification or NO x – -dependent Fe(II) oxidation (NDFO). Theoretically, the generated NO x – can be converted into N 2 via the NDFO process, but the autotrophic NDFO bacteria did not have a growth advantage in AD reactors with high organic contents . Therefore, it was reasonable to deduce that denitrification was the main pathway for the NO 3 – -N removal pathway.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the implementation of Feammox in AD reactors is expected to advance the conversion of NH 4 + -N into N 2 by coupling with denitrification. Iron-reducing bacteria (IRBs) are identified as the key mediators of Feammox process, and various Fe(III) compounds including Fe 2 O 3 , Fe(OH) 3 , FeCl 3 , pyrite, magnetite, and goethite have been proven to be effective for enriching IRBs and triggering Feammox reactions. , Iron sludge that mainly consists of Fe(OH) 3 is a type of waste generated from Fenton reactions (for advanced treatment of the aquaculture effluent) or iron-salt-based flocculation (for solid–liquid separation). The good availability, relatively high solubility, large specific surface area, high microbial accessibility, and low crystallinity of iron sludge make it an ideal Fe(III) source.…”

Section: Introductionmentioning

confidence: 99%

“…The good availability, relatively high solubility, large specific surface area, high microbial accessibility, and low crystallinity of iron sludge make it an ideal Fe(III) source. It is noteworthy that the Feammox efficiency is positively correlated with the microbial reducible Fe(III) content . To sustain successive Feammox reactions for NH 4 + -N removal from N-rich fish sludge, a large amount of exogenous Fe(III) is needed, which is impractical from an economical or environmental point of view.…”

Section: Introductionmentioning

confidence: 99%

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Coupling Iron Sludge Addition and Intermittent Aeration for Achieving Simultaneous Methanogenesis, Feammox, and Denitrification in a Single Reactor Treating Fish Sludge

Xia,

Liu,

Sun

et al. 2023

Environ. Sci. Technol.

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An integrated anaerobic digestion system for the simultaneous removal of carbon and nitrogen from fish sludge was developed by coupling iron sludge supplementation with intermittent aeration. In terms of nitrogen removal, Fe(III) in iron sludge could trigger Feammox reactions and intermittent aeration could drive the Fe(II)/Fe(III) cycle to sustain continuous ammonia removal. Mass balance analysis suggested that nitrate was the main product of Feammox, which was subsequently removed through heterotrophic denitrification. In terms of carbon removal, the Fe(III)-induced dissimilatory iron reduction (DIR) process significantly promoted fish sludge hydrolysis and provided more simple organics for methanogens and denitrifiers, but aeration showed a negative impact on methanogenesis. To promote nitrogen removal and avoid serious methanogenesis inhibition, different aeration intensities were studied. Results showed that compared with the control without aeration or iron sludge addition, aeration for 5 min every 3 days (150 mL/min) contributed to a 29.0% lower NH 4 + -N concentration and a 12.1% lower total chemical oxygen demand level on day 28, and the decline in methane yield was acceptable (only 13.5% lower). Simultaneous methanogenesis, Feammox, and denitrification in a single reactor treating fish sludge were achieved, which provides a simple and low-cost strategy for the treatment of organic wastewater.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coupling Iron Sludge Addition and Intermittent Aeration for Achieving Simultaneous Methanogenesis, Feammox, and Denitrification in a Single Reactor Treating Fish Sludge

Xia,

Liu,

Sun

et al. 2023

Environ. Sci. Technol.

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Anammox with alternative electron acceptors: perspectives for nitrogen removal from wastewaters

Ponce-Jahen,

Cercado,

Estrada-Arriaga

et al. 2023

Biodegradation

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In the context of the anaerobic ammonium oxidation process (anammox), great scientific advances have been made over the past two decades, making anammox a consolidated technology widely used worldwide for nitrogen removal from wastewaters. This review provides a detailed and comprehensive description of the anammox process, the microorganisms involved and their metabolism. In addition, recent research on the application of the anammox process with alternative electron acceptors is described, highlighting the biochemical reactions involved, its advantages and potential applications for specific wastewaters. An updated description is also given of studies reporting the ability of microorganisms to couple the anammox process to extracellular electron transfer to insoluble electron acceptors; particularly iron, carbon-based materials and electrodes in bioelectrochemical systems (BES). The latter, also referred to as anodic anammox, is a promising strategy to combine the ammonium removal from wastewater with bioelectricity production, which is discussed here in terms of its efficiency, economic feasibility, and energetic aspects. Therefore, the information provided in this review is relevant for future applications.

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Advanced biological technologies for removal and recovery of reactive nitrogen (Nr) from wastewaters

Lin

Lee²,

Mannina³

et al. 2023

Bioresource Technology

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Recent progress in applications of Feammox technology for nitrogen removal from wastewaters: A review

Cited by 36 publications

References 81 publications

Coupling Iron Sludge Addition and Intermittent Aeration for Achieving Simultaneous Methanogenesis, Feammox, and Denitrification in a Single Reactor Treating Fish Sludge

Coupling Iron Sludge Addition and Intermittent Aeration for Achieving Simultaneous Methanogenesis, Feammox, and Denitrification in a Single Reactor Treating Fish Sludge

Anammox with alternative electron acceptors: perspectives for nitrogen removal from wastewaters

Advanced biological technologies for removal and recovery of reactive nitrogen (Nr) from wastewaters

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