Factors affecting N2O emissions from wastewater treatment plants: Comparison
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Please note this is a comparison between Version 1 by Liana Kemmu and Version 3 by Catherine Yang.

Nitrous oxide (N2O) is a greenhouse gas contributing to ozone layer depletion and climate

change. Wastewater treatment plants (WWTPs) geconeratribute significant amounts of grely to the global anthropogenic

N2O emissionhouse gs. The main factors affecting N2O emissions asre thes, including carb dissolved oxygen concentration

(DO), dthe nioxide, methane and nitrous oxide. Nitrous oxitrite accumulation, the rapidly changing process conditions, the substrate composition

ande (COD/N2O) ratis an important greenho, the pH, and the temperature. Low DO in the nitrification process results in higher

N2O emissiounse gas with a global warming , whereas high aeration rate in the nitration/anammox process results in higher N2O

protential (GWP) 273 times that of carbon dioxide (Cduction. High DO in the denitrification inhibits the N2O2), reducontributitase synthesis/activity, leading to

N2O accumulatiozone layer deplen. High nitrite accumulation in both the nitrification and climate change. Therefore, even denitrification processesma

ll eamounts ofds to high N2O emissions. can sigTransient DO changes and rapid shifts in pH result in high N2O

production. Ammonificantly contributea shock loads leads to incomplete nitrification, resulting in NO2- accumulatoion

and N2O formatiotal greenhouse gases (GHG) emissions. Thus, in. Limiting the biodegradable substrate hinders complete denitrification, leading

to can behigh N2O produconcluded that the minimization of tion. A COD/N ratio above 4 results in 20–30% of the nitrogen load being

N2O emissions. aMaximum N2O productiond the iat low pH (pH = 6) was observed during nitrification/

denitrification of the factors controlling thand at high pH (pH = 8) during partial nitrification. High temperature enhances

the demissions constitute a greatnitrification kinetics but produces more N2O challengemissions.

  • N2O production pathways
  • hydroxylamine oxidation
  • nitrifier denitrification
  • heterotrophic denitrification
  • influence of DO
  • COD/N
  • pH and temperature
  • N2O sampling
  • N2O measurements
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