Analysis of nitrous oxide emissions from aerobic granular sludge treating high saline municipal wastewater

Thwaites, Benjamin J.; Stuetz, Richard M.; Short, Michael D.; Reeve, Petra J.; Alvarez-Gaitan, Juan-Pablo; Dinesh, Nirmala; Philips, Renae; Akker, Ben van den

doi:10.1016/j.scitotenv.2020.143653

Cited by 12 publications

(4 citation statements)

References 60 publications

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“…It also obtained 96% N 2 O footprint reduction compared to that under extreme conditions (DO = 0.5 mg-O 2 /L, NO 2 − = 50 mg-N/L). In addition, this study selected the maximum DO concentration (3.0 mg-O 2 /L) according to a pilot-scale AGS system with DO ranges of 0.5−3.0 mg-O 2 /L 65 and operational values at WWTPs. 11 Whether higher DO concentrations (>3.0 mg-O 2 /L) can efficiently suppress N 2 O production by AOB in AGS systems will be included in our future studies.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

Smaller Aerobic Granules Significantly Reduce N₂O Production by Ammonia-Oxidizing Bacteria: Evidences from Biochemical and Isotopic Analyses

Liu,

Zhao

et al. 2023

Environ. Sci. Technol.

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The mitigation of nitrous oxide (N2O) is of primary significance to offset carbon footprints in aerobic granular sludge (AGS) systems. However, a significant knowledge gap still exists regarding the N2O production mechanism and its pathway contribution. To address this issue, the impact of varying granule sizes, dissolved oxygen (DO), and nitrite (NO2 –) levels on N2O production by ammonia-oxidizing bacteria (AOB) during nitrification in AGS systems was comprehensively investigated. Biochemical and isotopic experiments revealed that increasing DO or decreasing NO2 – levels reduced N2O emission factors (by 13.8 or 19.5%) and production rates (by 0.08 or 0.35 mg/g VSS/h) via weakening the role of the AOB denitrification pathway since increasing DO competed for more electrons required for AOB denitrification. Smaller granules (0.5 mm) preferred to diminish N2O production via enhancing the role of NH2OH pathway (i.e., 59.4–100% in the absence of NO2 –), while larger granules (2.0 mm) induced conspicuously higher N2O production via the AOB denitrification pathway (approximately 100% at higher NO2 – levels). Nitrifying AGS systems with a unified size of 0.5 mm achieved 42% N2O footprint reduction compared with the system with mixed sizes (0.5–2.0 mm) under optimal conditions (DO = 3.0 mg-O2/L and NO2 – = 0 mg-N/L).

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Section: Environmental Science and Technologymentioning

confidence: 99%

Smaller Aerobic Granules Significantly Reduce N₂O Production by Ammonia-Oxidizing Bacteria: Evidences from Biochemical and Isotopic Analyses

Liu,

Zhao

et al. 2023

Environ. Sci. Technol.

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“…Since 1980, a variety of different methods for performing N 2 O measurements in WWTPs have been developed [5,9,18,24,36,89,108,[133][134][135][136][137], while various sampling strate-gies have been used to facilitate either dissolved and/or gaseous N 2 O measurements [22,23,25,26,40,[138][139][140].…”

Section: N 2 O Sampling Strategies and Measurement Techniquesmentioning

confidence: 99%

Factors Affecting Nitrous Oxide Emissions from Activated Sludge Wastewater Treatment Plants—A Review

Kemmou,

Amanatidou

2023

Resources

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Nitrous oxide (N2O) is a greenhouse gas contributing to ozone layer depletion and climate change. Wastewater treatment plants (WWTPs) contribute significantly to the global anthropogenic N2O emissions. The main factors affecting N2O emissions are the dissolved oxygen concentration (DO), the nitrite accumulation, the rapidly changing process conditions, the substrate composition and COD/N ratio, the pH, and the temperature. Low DO in the nitrification process results in higher N2O emissions, whereas high aeration rate in the nitration/anammox process results in higher N2O production. High DO in the denitrification inhibits the N2O reductase synthesis/activity, leading to N2O accumulation. High nitrite accumulation in both the nitrification and denitrification processes leads to high N2O emissions. Transient DO changes and rapid shifts in pH result in high N2O production. Ammonia shock loads leads to incomplete nitrification, resulting in NO2− accumulation and N2O formation. Limiting the biodegradable substrate hinders complete denitrification, leading to high N2O production. A COD/N ratio above 4 results in 20–30% of the nitrogen load being N2O emissions. Maximum N2O production at low pH (pH = 6) was observed during nitrification/denitrification and at high pH (pH = 8) during partial nitrification. High temperature enhances the denitrification kinetics but produces more Ν2O emissions.

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“…Other researchers have noted that, although AGS and CAS levels are similar, given the same operating parameters, AGS-based systems require higher sludge age (sludge retention time, SRT), which reduces low biomass growth [146]. Regardless, the rapid proliferation of AGS-based technologies is likely to be followed by a gradual rise in surplus granulated sludge produced, which will not be suitable for disposal into the environment due to its quality [147].…”

Section: Ags-related Determinants Of Anaerobic Digestionmentioning

confidence: 99%

Aerobic Granular Sludge as a Substrate in Anaerobic Digestion—Current Status and Perspectives

Kazimierowicz

Dębowski

2022

Sustainability

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Even though many wastewater treatment systems have been applied so far, there is still a need to develop methods, the implementation of which are technologically and economically justified. The aerobic granular sludge (AGS) method, which has been developed for several years, may represent an alternative to traditional technologies. One of the barriers to AGS deployment is the limited knowledge on the determinants and efficiency of the anaerobic digestion (AD) of AGS, as little research has been devoted to it. Therefore, the aim of the present paper is to summarize the current state of knowledge on the subject, including a review of technological conditions, process performance, and AGS parameters that can impact AD, and currently used pre-treatment methods. The anaerobic stabilization performance of AGS is compared against conventional activated sludge (CAS). The paper also identifies avenues for further research and practical implementations to further optimize the process and to determine whether AD is viable in full-scale plants.

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Analysis of nitrous oxide emissions from aerobic granular sludge treating high saline municipal wastewater

Cited by 12 publications

References 60 publications

Smaller Aerobic Granules Significantly Reduce N₂O Production by Ammonia-Oxidizing Bacteria: Evidences from Biochemical and Isotopic Analyses

Smaller Aerobic Granules Significantly Reduce N₂O Production by Ammonia-Oxidizing Bacteria: Evidences from Biochemical and Isotopic Analyses

Factors Affecting Nitrous Oxide Emissions from Activated Sludge Wastewater Treatment Plants—A Review

Aerobic Granular Sludge as a Substrate in Anaerobic Digestion—Current Status and Perspectives

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Analysis of nitrous oxide emissions from aerobic granular sludge treating high saline municipal wastewater

Cited by 12 publications

References 60 publications

Smaller Aerobic Granules Significantly Reduce N2O Production by Ammonia-Oxidizing Bacteria: Evidences from Biochemical and Isotopic Analyses

Smaller Aerobic Granules Significantly Reduce N2O Production by Ammonia-Oxidizing Bacteria: Evidences from Biochemical and Isotopic Analyses

Factors Affecting Nitrous Oxide Emissions from Activated Sludge Wastewater Treatment Plants—A Review

Aerobic Granular Sludge as a Substrate in Anaerobic Digestion—Current Status and Perspectives

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Product

Resources

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Smaller Aerobic Granules Significantly Reduce N₂O Production by Ammonia-Oxidizing Bacteria: Evidences from Biochemical and Isotopic Analyses

Smaller Aerobic Granules Significantly Reduce N₂O Production by Ammonia-Oxidizing Bacteria: Evidences from Biochemical and Isotopic Analyses