Nitrite removal by Acinetobacter sp.TX: a candidate of curbing N2O emission

Farming systems on peat soils are novel, considering the complexities of these organic soil. Since peat soils effectively capture greenhouse gases in their natural state, cultivating peat soils with annual or perennial crops such as pineapples necessitates the monitoring of nitrous oxide (N2O) emissions, especially from cultivated peat lands, due to a lack of data on N2O emissions. An on-farm experiment was carried out to determine the movement of N2O in pineapple production on peat soil. Additionally, the experiment was carried out to determine if the peat soil temperature and the N2O emissions were related. The chamber method was used to capture the N2O fluxes daily (for dry and wet seasons) after which gas chromatography was used to determine N2O followed by expressing the emission of this gas in t ha−1 yr−1. The movement of N2O horizontally (832 t N2O ha−1 yr−1) during the dry period was higher than in the wet period (599 t N2O ha−1 yr−1) because of C and N substrate in the peat soil, in addition to the fertilizer used in fertilizing the pineapple plants. The vertical movement of N2O (44 t N2O ha−1 yr−1) was higher in the dry season relative to N2O emission (38 t N2O ha−1 yr−1) during the wet season because of nitrification and denitrification of N fertilizer. The peat soil temperature did not affect the direction (horizontal and vertical) of the N2O emission, suggesting that these factors are not related. Therefore, it can be concluded that N2O movement in peat soils under pineapple cultivation on peat lands occurs horizontally and vertically, regardless of season, and there is a need to ensure minimum tilling of the cultivated peat soils to prevent them from being an N2O source instead of an N2O sink.

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A modeling approach to estimating N2O emission derived from loss of soil organic matter for the Japanese greenhouse gas inventory

Soil Science & Plant Nutrition ◽

10.1080/00380768.2021.1909428 ◽

2021 ◽

pp. 1-6

Author(s):

Yasuhito Shirato ◽

Ayaka W. Kishimoto-Mo ◽

Yusuke Takata

Keyword(s):

Organic Matter ◽

Soil Organic Matter ◽

Greenhouse Gas ◽

N2o Emission ◽

Greenhouse Gas Inventory ◽

Modeling Approach

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Soil N2O emission from organic and conventional cotton farming in Northern Tanzania

The Science of The Total Environment ◽

10.1016/j.scitotenv.2021.147301 ◽

2021 ◽

Vol 785 ◽

pp. 147301

Author(s):

Thomas N. Bwana ◽

Nyambilila A. Amuri ◽

Ernest Semu ◽

Lars Elsgaard ◽

Klaus Butterbach-Bahl ◽

...

Keyword(s):

N2o Emission ◽

Northern Tanzania

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Relative contributions of different substrates to soil N2O emission and their responses to N addition in a temperate forest

The Science of The Total Environment ◽

10.1016/j.scitotenv.2020.144126 ◽

2021 ◽

pp. 144126

Author(s):

Bo Peng ◽

Jianfei Sun ◽

Jun Liu ◽

Zongwei Xia ◽

Weiwei Dai

Keyword(s):

Temperate Forest ◽

N2o Emission ◽

N Addition

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Effects of biochar on N2O emission in denitrification pathway from paddy soil: A drying incubation study

The Science of The Total Environment ◽

10.1016/j.scitotenv.2021.147591 ◽

2021 ◽

pp. 147591

Author(s):

Han Li ◽

Jun Meng ◽

Zunqi Liu ◽

Yu Lan ◽

Xu Yang ◽

...

Keyword(s):

Paddy Soil ◽

N2o Emission ◽

Incubation Study

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Minimization of N2O Emission through Intermittent Aeration in a Sequencing Batch Reactor (SBR): Main Behavior and Mechanism

Water ◽

10.3390/w13020210 ◽

2021 ◽

Vol 13 (2) ◽

pp. 210

Author(s):

Tang Liu ◽

Shufeng Liu ◽

Shishi He ◽

Zhichao Tian ◽

Maosheng Zheng

Keyword(s):

Wastewater Treatment ◽

Wastewater Treatment Plants ◽

Batch Reactor ◽

Quantitative Polymerase Chain Reaction ◽

N2o Emission ◽

Ammonia Oxidizer ◽

Batch Reactors ◽

Intermittent Aeration ◽

Major Pathway ◽

Nitrifier Denitrification

To explore the main behavior and mechanism of minimizing nitrous oxide (N2O) emission through intermittent aeration during wastewater treatment, two lab-scale sequencing batch reactors operated at intermittently aerated mode (SBR1), and continuously aerated mode (SBR2) were established. Compared with SBR2, the intermittently aerated SBR1 reached not only a higher total nitrogen removal efficiency (averaged 93.5%) but also a lower N2O-emission factor (0.01–0.53% of influent ammonia), in which short-cut nitrification and denitrification were promoted. Moreover, less accumulation and consumption of polyhydroxyalkanoates, a potential endogenous carbon source promoting N2O emission, were observed in SBR1. Batch experiments revealed that nitrifier denitrification was the major pathway generating N2O while heterotrophic denitrification played as a sink of N2O, and SBR1 embraced a larger N2O-mitigating capability. Finally, quantitative polymerase chain reaction results suggested that the abundant complete ammonia oxidizer (comammox) elevated in the intermittently aerated environment played a potential role in avoiding N2O generation during wastewater treatment. This work provides an in-depth insight into the utilization of proper management of intermittent aeration to control N2O emission from wastewater treatment plants.

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The interaction of seasonal rainfall and nitrogen fertiliser rate on soil N2O emission, total N loss and crop yield of dryland sorghum and sunflower grown on sub-tropical Vertosols

Soil Research ◽

10.1071/sr15286 ◽

2016 ◽

Vol 54 (5) ◽

pp. 604 ◽

Cited By ~ 23

Author(s):

G. D. Schwenke ◽

B. M. Haigh

Keyword(s):

Crop Yield ◽

Crop Production ◽

Field Experiments ◽

N2o Emission ◽

N2o Emissions ◽

N Loss ◽

N Losses ◽

Total N ◽

Tropical Regions ◽

The Impact

Summer crop production on slow-draining Vertosols in a sub-tropical climate has the potential for large emissions of soil nitrous oxide (N2O) from denitrification of applied nitrogen (N) fertiliser. While it is well established that applying N fertiliser will increase N2O emissions above background levels, previous research in temperate climates has shown that increasing N fertiliser rates can increase N2O emissions linearly, exponentially or not at all. Little such data exists for summer cropping in sub-tropical regions. In four field experiments at two locations across two summers, we assessed the impact of increasing N fertiliser rate on both soil N2O emissions and crop yield of grain sorghum (Sorghum bicolor L.) or sunflower (Helianthus annuus L.) in Vertosols of sub-tropical Australia. Rates of N fertiliser, applied as urea at sowing, included a nil application, an optimum N rate and a double-optimum rate. Daily N2O fluxes ranged from –3.8 to 2734g N2O-Nha–1day–1 and cumulative N2O emissions ranged from 96 to 6659g N2O-Nha–1 during crop growth. Emissions of N2O increased with increased N fertiliser rates at all experimental sites, but the rate of N loss was five times greater in wetter-than-average seasons than in drier conditions. For two of the four experiments, periods of intense rainfall resulted in N2O emission factors (EF, percent of applied N emitted) in the range of 1.2–3.2%. In contrast, the EFs for the two drier experiments were 0.41–0.56% with no effect of N fertiliser rate. Additional 15N mini-plots aimed to determine whether N fertiliser rate affected total N lost from the soil–plant system between sowing and harvest. Total 15N unaccounted was in the range of 28–45% of applied N and was presumed to be emitted as N2O+N2. At the drier site, the ratio of N2 (estimated by difference)to N2O (measured) lost was a constant 43%, whereas the ratio declined from 29% to 12% with increased N fertiliser rate for the wetter experiment. Choosing an N fertiliser rate aimed at optimum crop production mitigates potentially high environmental (N2O) and agronomic (N2+N2O) gaseous N losses from over-application, particularly in seasons with high intensity rainfall occurring soon after fertiliser application.

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NO x and N2O Emissions During Fluidized Bed Combustion of Leather Wastes

Journal of Energy Resources Technology ◽

10.1115/1.2126986 ◽

2005 ◽

Vol 128 (2) ◽

pp. 99-103 ◽

Cited By ~ 4

Author(s):

Alberto Bahillo ◽

Lourdes Armesto ◽

Andrés Cabanillas ◽

Juan Otero

Keyword(s):

Nitrogen Content ◽

Fluidized Bed ◽

Oxygen Content ◽

N2o Emission ◽

N2o Emissions ◽

Fluidized Bed Combustion ◽

High Nitrogen Content ◽

High Nitrogen ◽

Leather Wastes ◽

Leather Waste

Transformation of hide (animal skins) into leather is a complicated process during which significant amounts of wastes are generated. Fluidized bed combustion has been extended to burn different wastes that have problems with their disposal showing its technical feasibility. Considering the characteristics of the leather waste, especially the heating value (12.5-21MJ∕kg), it is a fairly good fuel. Moreover, leather waste has a high volatile matter, 65%, similar to other biomasses and unusual high nitrogen content, 14%. The aim of this work was to study leather wastes combustion in fluidized bed presenting experimental results regarding NOx and N2O emissions. A series of experiments were carried out in a fluidized bed pilot plant to understand the importance of operating parameters such as furnace temperature, oxygen content in gases, staged combustion and residence time on the NOx and N2O emission level. Despite having high nitrogen content, low conversion of N-fuel to NOx and N2O was measured during the combustion of leather waste in BFB. Bed temperature and oxygen content were found as the most important single parameters on N2O emission and only oxygen content has a significant influence on NOx emission. Leather waste exhibits a great NOx∕O2 trend; NOx emission decreases as the oxygen concentration decreases while the effect of combustion temperature on NOx is insignificant. Staged combustion does not give a reduction in NOx.

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Field study on N2O emission from subsurface wastewater infiltration system under variable loading rates and drying-wetting cycles

Water Science & Technology ◽

10.2166/wst.2017.388 ◽

2017 ◽

Vol 76 (8) ◽

pp. 2158-2166 ◽

Cited By ~ 10

Author(s):

Ying-Hua Li ◽

Hai-Bo Li ◽

Xin-Yang Xu ◽

Si-Yao Xiao ◽

Si-Qi Wang ◽

...

Keyword(s):

Field Study ◽

Conversion Rate ◽

Oxygen Demand ◽

N2o Emission ◽

Conversion Ratio ◽

Gas Chromatograph ◽

Variable Loading ◽

N2o Production ◽

Loading Rates ◽

Operation Conditions

In this field study, the impacts of influent loadings and drying-wetting cycles on N2O emission in a subsurface wastewater infiltration (SWI) system were investigated. N2O emitted under different operation conditions were quantified using static chamber and gas chromatograph techniques. N2O conversion rate decreased from 6.6 ± 0.1% to 2.7 ± 0.1% with an increase in hydraulic loading (HL) from 0.08 to 0.24 m3/m2·d. By contrast, N2O conversion rate increased with increasing pollutant loading (PL) up to 8.2 ± 0.5% (PL 4.2 g N/m2·d) above which conversion rate decreased, confirming that N2O production was under the interaction of nitrification and denitrification. Taking into consideration the pollutants (chemical oxygen demand (COD), NH4+-N, NO3−-N and total nitrogen (TN)) removal ratio and N2O emission, optimal loading ranges and drying-wetting modes were suggested as HL 0.08–0.12 m3/m2·d, PL 3.2–3.7 g N/m2·d and 12 h:12 h, respectively. The results revealed that in SWI systems, conversion ratio of influent nitrogen to N2O could be between 4.5% and a maximum of 7.0%.

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