Biological groundwater denitrification systems: Lab-scale trials aimed at nitrous oxide production and emission assessment

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Abstract

Bio-trenches are a sustainable option for treating nitrate contamination in groundwater. However, a possible side effect of this technology is the production of nitrous oxide, a greenhouse gas that can be found both dissolved in the liquid effluent as well as emitted as off gas. The aim of this study was to analyze NO3 − removal and N2O production in lab-scale column trials. The column contained olive nut as organic carbon media. The experimental study was divided into three phases (I, II and III) each characterized by different inlet NO3 − concentrations (30, 50, 75 mg NO3-N L−1 respectively). Sampling ports deployed along the length of the column allowed to observe the denitrification process as well as the formation and consumption of intermediate products, such as nitrite (NO2 −) and nitrous oxide (N2O). In particular, it was observed that N2O production represent only a small fraction of removed NO3 − during Phase I and II, both for dissolved (0.007%) and emitted (0.003%) phase, and it was recorded a high denitrification efficiency, over 99%. Nevertheless, significantly higher values were recorded for Phase 3 concerning emitted phase (0.018%). This fact is due to increased inlet concentration which resulted in a carbon limitation and in a consequent decrease in denitrification efficiency (76%).
Lingua originaleEnglish
pagine (da-a)462-468
Numero di pagine7
RivistaScience of the Total Environment
Volume630
Stato di pubblicazionePublished - 2018

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Denitrification
Nitrous Oxide
nitrous oxide
denitrification
Groundwater
Oxides
groundwater
nut
Nitrites
Organic carbon
Greenhouse gases
Nitrates
nitrite
trench
Effluents
greenhouse gas
Contamination
Carbon
experimental study
Gases

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

Cita questo

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title = "Biological groundwater denitrification systems: Lab-scale trials aimed at nitrous oxide production and emission assessment",
abstract = "Bio-trenches are a sustainable option for treating nitrate contamination in groundwater. However, a possible side effect of this technology is the production of nitrous oxide, a greenhouse gas that can be found both dissolved in the liquid effluent as well as emitted as off gas. The aim of this study was to analyze NO3 − removal and N2O production in lab-scale column trials. The column contained olive nut as organic carbon media. The experimental study was divided into three phases (I, II and III) each characterized by different inlet NO3 − concentrations (30, 50, 75 mg NO3-N L−1 respectively). Sampling ports deployed along the length of the column allowed to observe the denitrification process as well as the formation and consumption of intermediate products, such as nitrite (NO2 −) and nitrous oxide (N2O). In particular, it was observed that N2O production represent only a small fraction of removed NO3 − during Phase I and II, both for dissolved (0.007{\%}) and emitted (0.003{\%}) phase, and it was recorded a high denitrification efficiency, over 99{\%}. Nevertheless, significantly higher values were recorded for Phase 3 concerning emitted phase (0.018{\%}). This fact is due to increased inlet concentration which resulted in a carbon limitation and in a consequent decrease in denitrification efficiency (76{\%}).",
author = "Marco Capodici and Alessia Avona and Laudicina, {Vito Armando} and Gaspare Viviani",
year = "2018",
language = "English",
volume = "630",
pages = "462--468",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier",

}

TY - JOUR

T1 - Biological groundwater denitrification systems: Lab-scale trials aimed at nitrous oxide production and emission assessment

AU - Capodici, Marco

AU - Avona, Alessia

AU - Laudicina, Vito Armando

AU - Viviani, Gaspare

PY - 2018

Y1 - 2018

N2 - Bio-trenches are a sustainable option for treating nitrate contamination in groundwater. However, a possible side effect of this technology is the production of nitrous oxide, a greenhouse gas that can be found both dissolved in the liquid effluent as well as emitted as off gas. The aim of this study was to analyze NO3 − removal and N2O production in lab-scale column trials. The column contained olive nut as organic carbon media. The experimental study was divided into three phases (I, II and III) each characterized by different inlet NO3 − concentrations (30, 50, 75 mg NO3-N L−1 respectively). Sampling ports deployed along the length of the column allowed to observe the denitrification process as well as the formation and consumption of intermediate products, such as nitrite (NO2 −) and nitrous oxide (N2O). In particular, it was observed that N2O production represent only a small fraction of removed NO3 − during Phase I and II, both for dissolved (0.007%) and emitted (0.003%) phase, and it was recorded a high denitrification efficiency, over 99%. Nevertheless, significantly higher values were recorded for Phase 3 concerning emitted phase (0.018%). This fact is due to increased inlet concentration which resulted in a carbon limitation and in a consequent decrease in denitrification efficiency (76%).

AB - Bio-trenches are a sustainable option for treating nitrate contamination in groundwater. However, a possible side effect of this technology is the production of nitrous oxide, a greenhouse gas that can be found both dissolved in the liquid effluent as well as emitted as off gas. The aim of this study was to analyze NO3 − removal and N2O production in lab-scale column trials. The column contained olive nut as organic carbon media. The experimental study was divided into three phases (I, II and III) each characterized by different inlet NO3 − concentrations (30, 50, 75 mg NO3-N L−1 respectively). Sampling ports deployed along the length of the column allowed to observe the denitrification process as well as the formation and consumption of intermediate products, such as nitrite (NO2 −) and nitrous oxide (N2O). In particular, it was observed that N2O production represent only a small fraction of removed NO3 − during Phase I and II, both for dissolved (0.007%) and emitted (0.003%) phase, and it was recorded a high denitrification efficiency, over 99%. Nevertheless, significantly higher values were recorded for Phase 3 concerning emitted phase (0.018%). This fact is due to increased inlet concentration which resulted in a carbon limitation and in a consequent decrease in denitrification efficiency (76%).

UR - http://hdl.handle.net/10447/282605

M3 - Article

VL - 630

SP - 462

EP - 468

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -