Characteristics of N2O release from fluidized media type BNR processes and identification of N2O sources 2

Tae-Hyeong Kim; Myoung-Joo Lee; Hyun-Sup Jang; Boo-Ki Min; Ga-Young Yoo; Sun-Jin Hwang
April 2011
Desalination & Water Treatment;Apr2011, Vol. 28 Issue 1-3, p378
Academic Journal
The effects of C/N ratios and fluidized media on N2O emissions were investigated during the conventional biological nitrogen removal (BNR) process for wastewater treatment containing high levels of nitrogen. Low concentration of N2O emissions was maintained at around 50~100 ppm when the C/N ratio was 3. However higher amounts of N2O (maximum rate 800 ppm) were released from denitrification, when the C/N ratio was 1.5 and 1, compared to when the ratio was 3. The influence of oxygen concentration on N2O release as well as its sources was investigated using a nitrogen isotope (15N) tracer method. Our results indicated that around 50% of the released N2O was originated from denitrification under aerobic conditions. Under aerobic conditions, the proportion and amount of N2O emissions from denitrification increased with a decrease in dissolved oxygen (DO). In micro-aerobic conditions, 98.6% of N2O emission was originated from denitrification. This result implies that an anoxic zone was present even in aerobic reactors and that reactors with low DO tended to have larger anaerobic zones.


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