N2O emission in partial nitritation-anammox process

Li, Li; Ling, Yu; Wang, Haiyan; Chu, Zhaosheng; Yan, Guokai; Li, Zewen; Wu, Tong

doi:10.1016/j.cclet.2019.06.035

Cited by 43 publications

(16 citation statements)

References 114 publications

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“…Our results open up the possibility that a significant proportion of the Proterozoic nitrite budget was consumed by anammox bacteria, and that the sedimentary nitrogen isotope record might be influenced by their activity. Our findings may have implications for Proterozoic climate, because N 2 O has previously been invoked as an important greenhouse gas at that time 88 , but a relatively higher contribution of anammox bacteria to the marine nitrogen cycle may have hampered N 2 O production 3 . Lastly, our study suggests that the impacts of the GOE go well beyond aerobic prokaryotes.…”

Section: Caveats and Concluding Remarksmentioning

confidence: 83%

“…Along with denitrification, it is recognized as an important biological process that leads to N loss from the environment 1,2 . In contrast to the nitrification-denitrification process for wastewater treatment, coupling partial nitrification and anammox is cost-effective and environmentally friendly due to its lower oxygen requirement for aeration (nitrite [N(+III)], instead of nitrate [N(+V)] is sufficient for the anammox metabolism), carbon free cultivation (some denitrifying bacteria are heterotrophic) and its negligible emissions of greenhouse gases like N 2 O. Consequently, anammox bacteria, the organisms that perform anammox, have been widely used in wastewater treatments [2][3][4][5] . Nevertheless, their evolutionary history and antiquity are poorly known, which hinders accurate reconstructions of the biogeochemical nitrogen cycle over geologic time.…”

Section: Introductionmentioning

confidence: 99%

“…In wastewater treatment, anammox is more cost-effective and environmentally friendlier than denitrification due to its lower oxygen requirement for aeration (nitrite [N(+III)], instead of nitrate [N(+V)] is sufficient for the anammox metabolism), carbon-free cultivation (some denitrifying bacteria are heterotrophic) and its negligible emissions of greenhouse gases like N 2 O [4,5]. Consequently, anammox bacteria, the organisms that perform anammox, have been widely used in wastewater treatment plants [3,[6][7][8]. Despite the environmental and industrial importance of these organisms, their evolutionary history and antiquity are poorly known, which hinders accurate reconstructions of the biogeochemical nitrogen cycle over geologic time.…”

Section: Introductionmentioning

confidence: 99%

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Phylogenomic evidence for the Origin of Obligately Anaerobic Anammox Bacteria around the Great Oxidation Event

Liao

Wang

Luo

2021

Preprint

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The anaerobic ammonium oxidation (anammox) bacteria transform ammonium and nitrite to dinitrogen gas, and this obligate anaerobic process accounts for nearly half of global nitrogen loss. Yet its origin and evolution, which may give important insights into the biogeochemistry of early Earth, remains enigmatic. Here, we compile a comprehensive sequence data set of anammox bacteria, and confirm their single origin within the phylum Planctomycetes. After accommodating the uncertainties and factors influencing time estimates with different statistical methods, we estimate that anammox bacteria originated at around the so-called Great Oxidation Event (GOE; 2.32 to 2.5 billion years ago [Gya]) which is thought to have fundamentally changed global biogeochemical cycles. We further show that during the origin of anammox bacteria, genes involved in oxidative stress, bioenergetics and anammox granules formation were recruited, which may have contributed to their survival in an increasingly oxic Earth. Our findings suggest the rising level of atmospheric oxygen, which made nitrite increasingly available, as a potential driving force for the emergence of anammox bacteria. This is one of the first studies that link GOE to the evolution of obligate anaerobic bacteria.

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Section: Caveats and Concluding Remarksmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phylogenomic evidence for the Origin of Obligately Anaerobic Anammox Bacteria around the Great Oxidation Event

Liao

Wang

Luo

2021

Preprint

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“…Besides, the existing quantification methods are complex and labor-intensive, making the quantification of N 2 O complicated for WWTPs. Readers can refer to Li et al 99 for a review on existing N 2 O analytical methods in WWTPs. We believe that simpler, less labor-intensive measurement strategies need to be proposed.…”

Section: Challenges and Opportunities For N 2 Omentioning

confidence: 99%

“…In PNA system, N 2 O emissions can be attributed mostly to AOB and partly to heterotrophic denitrifier in PNA systems. While anammox do not lead to N 2 O emissions, PNA systems are still often found with higher N 2 O emissions than conventional nitrification/denitrification, likely resulted from the stimulation of high NH 4 + loading to AOB . Therefore, while anammox can carry out BNR without generating N 2 O, AOB that is necessary in the PNA process could still emit, even more N 2 O than in the conventional process.…”

Section: Challenges and Opportunities For N2o Mitigation At Wwtpsmentioning

confidence: 99%

Insights into Nitrous Oxide Mitigation Strategies in Wastewater Treatment and Challenges for Wider Implementation

Duan

Zhao

Koch

et al. 2021

Environ. Sci. Technol.

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Nitrous oxide (N 2 O) emissions account for the majority of the carbon footprint of wastewater treatment plants (WWTPs). Many N 2 O mitigation strategies have since been developed while a holistic view is still missing. This article reviews the state-of-the-art of N 2 O mitigation studies in wastewater treatment. Through analyzing existing studies, this article presents the essential knowledge to guide N 2 O mitigations, and the logics behind mitigation strategies. In practice, mitigations are mainly carried out by aeration control, feed scheme optimization, and process optimization. Despite increasingly more studies, real implementation remains rare, which is a combined result of unclear climate change policies/incentives, as well as technical challenges. Five critical technical challenges, as well as opportunities, of N 2 O mitigations were identified. It is proposed that (i) quantification methods for overall N 2 O emissions and pathway contributions need improvement; (ii) a reliable while straightforward mathematical model is required to quantify benefits and compare mitigation strategies; (iii) tailored risk assessment needs to be conducted for WWTPs, in which more longterm full-scale trials of N 2 O mitigation are urgently needed to enable robust assessments of the resulting operational costs and impact on nutrient removal performance; (iv) current mitigation strategies focus on centralized WWTPs, more investigations are warranted for decentralised systems, especially decentralized activated sludge WWTPs; and (v) N 2 O may be mitigated by adopting novel strategies promoting N 2 O reduction denitrification or microorganisms that emit less N 2 O. Overall, we conclude N 2 O mitigation research is reaching a maturity while challenges still exist for a wider implementation, especially in relation to the reliability of N 2 O mitigation strategies and potential risks to nutrient removal performances of WWTPs.

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Upflow blanket filter anammox (UBFA) system treating low-nitrogen wastewater: high-efficient nitrogen removal, granules formation, N2O emission, and microbial succession

Wang,

Gao,

Gao

et al. 2024

Bioprocess Biosyst Eng

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N2O emission in partial nitritation-anammox process

Cited by 43 publications

References 114 publications

Phylogenomic evidence for the Origin of Obligately Anaerobic Anammox Bacteria around the Great Oxidation Event

Phylogenomic evidence for the Origin of Obligately Anaerobic Anammox Bacteria around the Great Oxidation Event

Insights into Nitrous Oxide Mitigation Strategies in Wastewater Treatment and Challenges for Wider Implementation

Upflow blanket filter anammox (UBFA) system treating low-nitrogen wastewater: high-efficient nitrogen removal, granules formation, N2O emission, and microbial succession

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