Abstract
Nitrous oxide (N2O) generation and emission from No. 3 wastewater treatment plant (WWTP) in Xi’an (Orbal oxidation ditch) and No. 4 WWTP in Xi’an (reversed A/A/O) were measured throughout a year following the water environment research foundation protocol. The N2O generation and emission rates of No. 4 WWTP (generation rate of 14.43 kg (N2O)/d and emission rate of 13.78 kg (N2O)/d) were about twice that of No. 3 WWTP (generation rate of 7.09 kg (N2O)/d and emission rate of 6.52 kg (N2O)/d). The N2O emission factor of No. 4 WWTP (54.64 mg (N2O)/m3 INF) was about 1.7 times that of No. 3 WWTP (36.20 mg (N2O)/m3 INF). The ammonia oxidation rate, nitrite oxidation rate, and nitrous oxide generation rate were also measured. Results showed that the key factors of N2O generation and emission were the microbial population and aeration strategy.
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