Effect of C/N ratio on nitrous oxide emission from swine wastewater treatment process

Naohiro Kishida, J. H. Kim, Y. Kimochi, O. Nishimura, H. Sasaki, R. Sudo

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)


To evaluate control parameters for nitrous oxide (N2O) emissions in the swine wastewater treatment process, the N2O emission was compared in the activated sludge from SBRs acclimated in different carbon/nitrogen (C/N) ratios. N2O emission from a denitrification phase was very strongly dependent on C/N ratio of swine wastewater, and the total N2O emission in the operating condition of BOD5/TN ratio of 2.6 was approximately 270 times greater than that in BOD5/TN ratio of 4.5. However, the effect of C/N ratio on N2O emission amount from nitrification was not significant in an oxic phase study. It is considered that stabilization of the C/N ratio through optimal solid-liquid separation of slurry or use of an external carbon source is indispensable for effective N2O emission control from nitrogen removal process of swine wastewater.

Original languageEnglish
Pages (from-to)359-365
Number of pages7
JournalWater Science and Technology
Issue number5-6
Publication statusPublished - 2004


  • C/N ratio
  • Greenhouse gas
  • Nitrous oxide
  • Swine wastewater

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology


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