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Water Science & Technology Vol 49 No 5-6 pp 359 - 371 © IWA Publishing 2004 Effect of C/N ratio on nitrous oxide emission from swine wastewater treatment processN. Kishida*, J.H. Kim**, Y. Kimochi***, O. Nishimura****, H. Sasaki***** and R. Sudo*******Department of Environmental Resources Engineering, Waseda University, 3-4-1 Ohkubo, Shinjyuku-ku, Tokyo 1698555, Japan 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. PAY-PER-VIEW: Buy this article for £23.5 (IWA MEMBER PRICE: £17.63) - All prices include VAT |
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