Effect of COD/N ratio on N2O production during nitrogen removal by aerobic granular sludge

Velho, Viviane Furtado; Magnus, Bruna Scandolara; Daudt, Gilberto Caye; Xavier, Jéssica Antunes; Guimarães, Lorena; Costa, Rejane Helena Ribeiro da

doi:10.2166/wst.2017.502

Cited by 9 publications

(3 citation statements)

References 27 publications

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“…No entanto, no processo de desnitrificação, o carbono orgânico também é consumido para síntese celular e respiração endógena (Henze, 2010). Sendo assim, de maneira bastante segura, se no digestato se observar relação C/N acima de 2 ou relação DQO/N acima de 5, a reação de desnitrificação ocorrerá sem limitações (Velho et al, 2017;Kishida et al, 2004;Chung et al, 2004).…”

Section: Equação 15unclassified

Fundamentos da digestão anaeróbia, purificação do biogás, uso e tratamento do digestato

Kunz¹,

Steinmetz²,

Amaral³

2019

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Section: Equação 15unclassified

Fundamentos da digestão anaeróbia, purificação do biogás, uso e tratamento do digestato

Kunz¹,

Steinmetz²,

Amaral³

2019

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“…N is one of the most critical components in the ecosystem and an essential nutrient for plant growth and survival. Several processes regulate the N cycle, one of which is denitrification, with the help of denitrifying bacteria (e.g., Shewanella, Achromobacter, and Pseudoxanthomonas) [16][17][18][19]. Unconstrained bamboo expansion is well-reported to alter soil N cycle in the colonized habitat.…”

Section: Introductionmentioning

confidence: 99%

Moso Bamboo Invasion Reshapes Community Structure of Denitrifying Bacteria in Rhizosphere of Alsophila spinulosa

Zuo

Xia

et al. 2022

Microorganisms

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The uncontrolled invasion of moso bamboo (Phyllostachys pubescens) dramatically alters soil nitrogen cycling and destroys the natural habitat of Alsophila spinulosa. Nevertheless, no clear evidence points out the role of denitrifying bacteria in the invasion of bamboo into the habitat of A. spinulosa. In the present study, we found that low (importance value 0.0008), moderate (0.6551), and high (0.9326) bamboo invasions dramatically altered the underground root biomass of both P. pubescens and A. spinulosa. The root biomass of A. spinulosa was maximal at moderate invasion, indicating that intermediate disturbance might contribute to the growth and survival of the colonized plant. Successful bamboo invasion significantly increased rhizospheric soil available nitrogen content of A. spinulosa, coupled with elevated denitrifying bacterial abundance and diversity. Shewanella, Chitinophaga, and Achromobacter were the primary genera in the three invasions, whereas high bamboo invasion harbored more denitrifying bacteria and higher abundance than moderate and low invasions. Further correlation analysis found that most soil denitrifying bacteria were positively correlated with soil organic matter and available nitrogen but negatively correlated with pH and water content. In addition, our findings illustrated that two denitrifying bacteria, Chitinophaga and Sorangium, might be essential indicators for evaluating the effects of bamboo invasion on the growth of A. spinulosa. Collectively, this study found that moso bamboo invasion could change the nitrogen cycling of colonized habitats through alterations of denitrifying bacteria and provided valuable perspectives for profound recognizing the invasive impacts and mechanisms of bamboo expansion.

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“…. Lan et al (2019) reported that a low S/N (w/w) ratio of one caused NO accumulation because competition for electrons caused incomplete denitrification (Velho et al, 2017;Pan et al, 2013). Another study reported that a high NO 2 − concentration (30 mg N L −1 ) promoted NO accumulation (Castro-Barros et al, 2016).…”

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Sulfur-Based Denitrification in Streambank Subsoils in a Headwater Catchment Underlain by Marine Sedimentary Rocks in Akita, Japan

Hayakawa

Ota

Asano

et al. 2021

Front. Environ. Sci.

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Sulfur-based denitrification may be a key biogeochemical nitrate (NO3−) removal process in sulfide-rich regions, but it is still poorly understood in natural terrestrial ecosystems. We examined sulfur-driven NO3− reduction using streambank soils in a headwater catchment underlain by marine sedimentary rock in Akita, Japan. In a catchment exhibiting higher sulfide content in streambed sediment, we sampled two adjacent streambank soils of streambank I (two layers) and of streambank II (eight layers). Anaerobic long-term incubation experiments (40 days, using soils of streambank I) and short-term incubation experiments (5 days, using soils of streambank II) were conducted to evaluate variations of N solutes (NO3−, NO2−, and NH4+), N gases (NO, N2O), and the bacterial flora. In both experiments, two treatment solutions containing NO3− (N treatment), and NO3− and S2O32− (N + S treatment) were prepared. In the N + S treatment of the long-term experiment, NO3− concentrations gradually decreased by 98%, with increases in the SO42−, NO2−, NO, and N2O concentrations and with not increase in the NH4+, indicating denitrification had occurred with a high probability. Temporal accumulation of NO2− was observed in the N + S treatment. The stoichiometric ratio of SO42− production and NO3− depletion rates indicated that denitrification using reduced sulfur occurred even without additional S, indicating inherent S also served as an electron donor for denitrification. In the short-term incubation experiment, S addition was significantly decreased NO3− concentrations and increased NO2−, NO, and N2O concentrations, especially in some subsoils with higher sulfide contents. Many denitrifying sulfur-oxidizing bacteria (Thiobacillus denitrificans and Sulfuricella denitrificans) were detected in both streambank I and II, which dominated up to 5% of the entire microbial population, suggesting that these bacteria are widespread in sulfide-rich soil layers in the catchment. We concluded that the catchment with abundant sulfides in the subsoil possessed the potential for sulfur-driven NO3− reduction, which could widely influence N cycling in and NO3− export from the headwater catchment.

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Effect of COD/N ratio on N2O production during nitrogen removal by aerobic granular sludge

Cited by 9 publications

References 27 publications

Fundamentos da digestão anaeróbia, purificação do biogás, uso e tratamento do digestato

Fundamentos da digestão anaeróbia, purificação do biogás, uso e tratamento do digestato

Moso Bamboo Invasion Reshapes Community Structure of Denitrifying Bacteria in Rhizosphere of Alsophila spinulosa

Sulfur-Based Denitrification in Streambank Subsoils in a Headwater Catchment Underlain by Marine Sedimentary Rocks in Akita, Japan

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