A comprehensive model of N2O emissions in an anaerobic/oxygen-limited aerobic process under dynamic conditions

Li, Zhen; Wan, Jinquan; Ma, Yuanyuan; Wang, Yan; Huang, Yifeng; Fan, Huimin

doi:10.1007/s00449-020-02307-7

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…In anammoxdriven wastewater treatment systems, N2O is produced through three pathways, i.e., hydroxylamine oxidation, nitrifier denitrification, and heterotrophic denitrification, and is Mathematical models have been successfully applied to evaluate N 2 O mitigation strategies by quantifying nitrogen removal in conventional full-scale WWTPs [37]. Among various published mathematical N 2 O models, the ASM2d-N 2 O model developed by Massara et al [87], which is a kind of activated sludge model (ASM), has been widely used for assessing N 2 O emission from full-scale WWTPs [38,88,89]. Besides the classical mathematical models, novel machine learning methods, such as deep neural network (DNN) and long short-term memory (LSTM), have also been used for N 2 O emission prediction [90].…”

Section: Discussionmentioning

confidence: 99%

“…Although the N 2 O yield is significantly higher in nitrifier denitrification catalyzed by P450nor in AOA under aerobic conditions at low pH, it is still lower than that obtained by nitrifier denitrification catalyzed by NOR and hydroxylamine oxidation catalyzed by CytL in AOB under low-oxygen conditions [ 33 ]. Therefore, AOB are the dominant N 2 O producers during the partial nitrification process [ 23 , 24 , 38 ].…”

Section: N 2 O Emissionmentioning

confidence: 99%

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Nitrous Oxide Emission from Full-Scale Anammox-Driven Wastewater Treatment Systems

Lin

Yang

2022

Life

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Wastewater treatment plants (WWTPs) are important contributors to global greenhouse gas (GHG) emissions, partly due to their huge emission of nitrous oxide (N2O), which has a global warming potential of 298 CO2 equivalents. Anaerobic ammonium-oxidizing (anammox) bacteria provide a shortcut in the nitrogen removal pathway by directly transforming ammonium and nitrite to nitrogen gas (N2). Due to its energy efficiency, the anammox-driven treatment has been applied worldwide for the removal of inorganic nitrogen from ammonium-rich wastewater. Although direct evidence of the metabolic production of N2O by anammox bacteria is lacking, the microorganisms coexisting in anammox-driven WWTPs could produce a considerable amount of N2O and hence affect the sustainability of wastewater treatment. Thus, N2O emission is still one of the downsides of anammox-driven wastewater treatment, and efforts are required to understand the mechanisms of N2O emission from anammox-driven WWTPs using different nitrogen removal strategies and develop effective mitigation strategies. Here, three main N2O production processes, namely, hydroxylamine oxidation, nitrifier denitrification, and heterotrophic denitrification, and the unique N2O consumption process termed nosZ-dominated N2O degradation, occurring in anammox-driven wastewater treatment systems, are summarized and discussed. The key factors influencing N2O emission and mitigation strategies are discussed in detail, and areas in which further research is urgently required are identified.

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Section: Discussionmentioning

confidence: 99%

Section: N 2 O Emissionmentioning

confidence: 99%

Nitrous Oxide Emission from Full-Scale Anammox-Driven Wastewater Treatment Systems

Lin

Yang

2022

Life

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“…Most previous AD simulation studies were based on lab-scale experiments. The local sensitivity analysis method was usually applied in these studies ( Tartakovsky et al, 2008 ; Barrera et al, 2015 ; Li et al, 2020 ). This method generally involves analyzing the different outputs obtained when an individual parameter is varied over a defined range while the other parameters remain constant.…”

Section: Methodsmentioning

confidence: 99%

Modeling the Performance of Full-Scale Anaerobic Biochemical System Treating Deinking Pulp Wastewater Based on Modified Anaerobic Digestion Model No. 1

Huang

Wan

et al. 2021

Front. Microbiol.

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The deinking pulp (DIP) is a main resource for paper making, and the wastewater from DIP process needs to be treated. Anaerobic biochemical technique has been widely applied in DIP wastewater treatment, due to the remarkable capability in reducing high chemical oxygen demand (COD). In this study, a mathematical simulation model was established to investigate the performance of a full-scale anaerobic biochemical system for treating DIP wastewater. The model was based on Anaerobic Digestion Model No. 1 (ADM1), which was modified according to the specific anaerobic digestion process for DIP wastewater treatment. The hydrodynamic behavior of a full-scale anaerobic biochemical system was considered in this model. The characteristics of the influent DIP wastewater were assessed, and then, the substrate COD proportion was divided successfully for the necessity of ADM1 applying. The Monte Carlo technique was implemented to distinguish the most sensitive parameters that influenced the model output indicators comprising effluent COD and biogas production. The sensitive parameters were estimated and optimized. The optimized value of k_m_pro is 12.02, K_S_pro is 0.35, k_m_ac is 4.26, K_S_ac is 0.26, k_m_h2 is 16.62, and K_S_h2 is 3.21 × 10–5. The model was calibrated with 150 days operation values measured in the field. The subsequent 100 days on-site values were used to validate the model, and the results obtained by the simulations were in good agreement. This study provides a meaningful and theoretical model guidance for full-scale wastewater anaerobic biochemical treatment simulation.

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Novel biological nitrogen removal process for the treatment of wastewater with low carbon to nitrogen ratio: A review

Wang

et al. 2023

Journal of Water Process Engineering

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A comprehensive model of N2O emissions in an anaerobic/oxygen-limited aerobic process under dynamic conditions

Cited by 4 publications

References 40 publications

Nitrous Oxide Emission from Full-Scale Anammox-Driven Wastewater Treatment Systems

Nitrous Oxide Emission from Full-Scale Anammox-Driven Wastewater Treatment Systems

Modeling the Performance of Full-Scale Anaerobic Biochemical System Treating Deinking Pulp Wastewater Based on Modified Anaerobic Digestion Model No. 1

Novel biological nitrogen removal process for the treatment of wastewater with low carbon to nitrogen ratio: A review

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