A critical review of improving mainstream anammox systems: Based on macroscopic process regulation and microscopic enhancement mechanisms

Zhang, Xiaonong; Zhang, Xingxing; Chen, Junjiang; Wu, Peng; Yang, Zuosheng; Zhou, Li; Zhu, Zhaoqi; Wu, Zhiqiang; Zhang, Kangyu; Wang, Yiwen; Ruth, Guerra

doi:10.1016/j.envres.2023.116770

Cited by 9 publications

(2 citation statements)

References 128 publications

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“…The increase in EPSs increased the content of flavin and c-Cyts, which will construct ESs channels and indirect/direct EET channels in the EPS layer of ANAMMOX cells in order to transfer electrons to extracellular receptors. As a result, the electron transfer rate is greatly enhanced and the metabolism of ANAMMOX is improved [24].…”

Section: Extracellular Polymeric Substances Enhance Anammox Activity ...mentioning

confidence: 99%

“…Studies have shown that supplementing ANAMMOX reactors with extracted EPSs or EPS-producing bacteria can significantly promote the growth, activity, and stability of ANAMMOX microorganisms under various conditions [17,[19][20][21]. The mechanisms involve the provision of structural support, a protective barrier, sorption sites, electron shuttles (ESs), signaling molecules, and nutrients from EPSs to ANAMMOX bacteria and their symbiotic partners [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Harnessing the Potential of Extracellular Polymeric Substances in Enhancing ANAMMOX Processes: Mechanisms, Strategies, and Perspectives

Fan,

Jiang,

Wang

et al. 2024

Water

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Anaerobic ammonium oxidation (ANAMMOX) has emerged as a promising sustainable nitrogen removal technology that offers significant advantages over conventional nitrification–denitrification processes, such as reduced energy consumption, a 60% reduction in oxygen demand, and a 90% reduction in sludge production. However, the practical application of ANAMMOX is hindered by several challenges, including the slow growth of ANAMMOX bacteria, long start-up periods, and high sensitivity to environmental disturbances. Recent studies have highlighted the crucial role of extracellular polymeric substances (EPSs) in the formation, activity, and stability of ANAMMOX biofilms and granules. An EPS is a complex mixture of high-molecular-weight polymers secreted by microorganisms, mainly composed of polysaccharides, proteins, nucleic acids, and lipids. The diverse physicochemical properties and functional groups of EPSs enable them to serve as a structural scaffold, protective barrier, sorption site, electron shuttle, and nutrient source for ANAMMOX bacteria. This review aims to provide an overview of the latest research progress on harnessing the potential of EPSs to enhance the ANAMMOX process. The characteristics, compositions, and extraction methods of ANAMMOX-derived EPSs are summarized. The mechanisms of how EPSs facilitate the enrichment, immobilization, aggregation, and adaptation of ANAMMOX bacteria are elucidated. The strategies and effects of EPS supplementation on improving the performance and robustness of ANAMMOX reactors under various stresses are critically reviewed. The challenges and future perspectives of the EPS-mediated optimization of the ANAMMOX process are also discussed. This review sheds new light on exploiting EPSs as a renewable bioresource to develop more efficient and stable ANAMMOX applications for sustainable wastewater treatment.

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Section: Extracellular Polymeric Substances Enhance Anammox Activity ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Harnessing the Potential of Extracellular Polymeric Substances in Enhancing ANAMMOX Processes: Mechanisms, Strategies, and Perspectives

Fan,

Jiang,

Wang

et al. 2024

Water

View full text Add to dashboard Cite

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Nitrous oxide emissions in novel wastewater treatment processes: A comprehensive review

An,

Zhang,

Gao

et al. 2024

Bioresource Technology

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Feasibility of in-situ sludge fermentation coupled with partial denitrification: Key roles of initial organic matters and alkaline pH

Wang,

Hao,

Jiang

et al. 2024

Bioresource Technology

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A critical review of improving mainstream anammox systems: Based on macroscopic process regulation and microscopic enhancement mechanisms

Cited by 9 publications

References 128 publications

Harnessing the Potential of Extracellular Polymeric Substances in Enhancing ANAMMOX Processes: Mechanisms, Strategies, and Perspectives

Harnessing the Potential of Extracellular Polymeric Substances in Enhancing ANAMMOX Processes: Mechanisms, Strategies, and Perspectives

Nitrous oxide emissions in novel wastewater treatment processes: A comprehensive review

Feasibility of in-situ sludge fermentation coupled with partial denitrification: Key roles of initial organic matters and alkaline pH

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