Succession of microbial communities reveals the inevitability of anammox core in the development of anammox processes

Zhang, Qi; Zheng, Jie; Zhao, Leizhen; Liu, Wenru; Chen, Liwei; Cai, Tianming; Ji, Xiaoming

doi:10.1016/j.biortech.2023.128645

Cited by 26 publications

(6 citation statements)

References 44 publications

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“…At the genus level (Figure b), Thermomonas of the phyla Proteobacteria was one of the dominant genera (0.3–26.9%), a common heterotrophic denitrification bacterium with the potential ability to degrade organic substances and assist AnAOB in removing nitrogen . The abundance of Thermomonas declined dramatically at 93 days, averaging only 2.1%, with C.…”

Section: Resultsmentioning

confidence: 99%

“…32 Chloroflexi-associated bacteria are known to coexist with AnAOB, degrade metabolites and decaying organisms, promote bacterial aggregation, and improve anammox reactor performance. 33 Bacteroidetes can degrade high molecular organic matter and preferentially enrich the sludge surface. 34 There was a significant upward trend in the abundance of Acidobacteria (4.5%), Chloroflexi (7.4%), and Bacteroidetes (2.3%).…”

Section: Heme Cmentioning

confidence: 99%

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Rapid Start-Up and Long-Term Stability of Anammox with Magnetic Biochar Addition: Performance Improvement, Microbial Community, and Potential Mechanisms

An,

Chang,

Xie

et al. 2023

ACS EST Eng.

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Accelerating the start-up of anaerobic ammonium oxidation (anammox) is the primary condition for its large-scale application. Anammox with magnetic biochar took the shortest start-up time, reducing 15–24 days compared to the control blank (CK) and 6–26 days with pyrolytic biochar. FCS300 (magnetic biochar prepared at 300 °C) could produce the highest levels of heme c (0.123 μmol/g VSS). The extracellular polymeric substances (EPS) in FCS300 had the lowest R ct (12.6 kΩ) and a substantially higher electron-transfer capability (ETC). Candidatus jettenia was the main anammox bacteria (AnAOB) in reactors after the successful start-up, and its distribution was spatially variable on the suspended sludge and the biofilm of the biochar. The findings implied that magnetic biochar might improve electron transfer by shortening the anammox start-up time via an electron shuttle mechanism or direct interspecies electron transfer.

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Section: Resultsmentioning

confidence: 99%

Section: Heme Cmentioning

confidence: 99%

Rapid Start-Up and Long-Term Stability of Anammox with Magnetic Biochar Addition: Performance Improvement, Microbial Community, and Potential Mechanisms

An,

Chang,

Xie

et al. 2023

ACS EST Eng.

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“…This, in turn, reduces water toxicity during the process and minimizes toxicity inhibition of functional bacteria such as ammonia-oxidizing bacteria and anaerobic ammonia-oxidizing bacteria. Furthermore, the aerobic process also consumes some carbon sources in the raw water, relieving the inhibitory effect of high-concentration carbon sources on microbial growth and metabolism in the anaerobic ammonia oxidation (anammox) process [19]. Additionally, this process facilitates the complete ammonification of nitrogenous organic compounds and toxic nitrogenous inorganic substances, which may potentially accumulate.…”

Section: Introductionmentioning

confidence: 99%

Process Energy and Material Consumption Determined by Reaction Sequence: From AAO to OHO

He,

Ke,

Wei

et al. 2024

Water

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The anaerobic-anoxic-oxic (AAO) process is one of the most widely used processes for treating industrial organic wastewater, and it has shown significant effectiveness in the removal of organic compounds, as well as denitrification and phosphorus removal. However, for the treatment of industrial organic wastewater, this anaerobic preposition and aerobic postposition process has exposed various limitations. Therefore, for this type of wastewater, the oxic-hydrolytic and denitrification-oxic (OHO) treatment process has been proposed and developed based on the principles of three-sludge separation and fluidization. This study integrated operational data from 203 coking wastewater treatment plants worldwide, and the two-step nitrification-denitrification activated sludge model No.3 (TCW-ASM3) was used for comparative analysis of the pollutant removal efficiency and total operating cost of the AAO process and the OHO process in the face of characteristic pollutants in coking wastewater. The results indicate that the full-scale OHO process achieved removal efficiencies of up to 3784 mg/L for chemical oxygen demand (COD) and 297 mg/L for total nitrogen (TN). The theoretical total cost for OHO and AAO were 9.75 and 14.38 CNY/m3, respectively. The pre-treatment aerobic process effectively reduces the biological toxicity of high-toxicity and refractory industrial wastewater, and the three-sludge system provides a stable living space for functional microorganisms, the combination of multi-mode denitrification processes offers new possibilities for treating similar types of industrial wastewater.

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“…Therefore, the PN/A process offers unique advantages of no external carbon sources consumption, high nitrogen removal efficiency, and low DO demand [10,11]. The PN/A process has become a research hotspot for the treatment of low C/N wastewater [12].…”

Section: Introductionmentioning

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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Succession of microbial communities reveals the inevitability of anammox core in the development of anammox processes

Cited by 26 publications

References 44 publications

Rapid Start-Up and Long-Term Stability of Anammox with Magnetic Biochar Addition: Performance Improvement, Microbial Community, and Potential Mechanisms

Rapid Start-Up and Long-Term Stability of Anammox with Magnetic Biochar Addition: Performance Improvement, Microbial Community, and Potential Mechanisms

Process Energy and Material Consumption Determined by Reaction Sequence: From AAO to OHO

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

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