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.
Effect of C/N ratio on nitrous oxide emission from swine wastewater treatment process
N. Kishida, J.H. Kim, Y. Kimochi, O. Nishimura, H. Sasaki, R. Sudo; Effect of C/N ratio on nitrous oxide emission from swine wastewater treatment process. Water Sci Technol 1 March 2004; 49 (5-6): 359–371. doi: https://doi.org/10.2166/wst.2004.0775
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