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  • Title: Effect of C/N ratio on nitrous oxide emission from swine wastewater treatment process.
    Author: Kishida N, Kim JH, Kimochi Y, Nishimura O, Sasaki H, Sudo R.
    Journal: Water Sci Technol; 2004; 49(5-6):359-65. PubMed ID: 15137445.
    Abstract:
    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.
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