Effect of nitrite on nitrous oxide generation and emission during denitrifying phosphorus removal
نویسندگان
چکیده
Nitrous oxide (N2O) generation and emission may hamper the wide application of denitrifying phosphorus removal technology. In this study, batch experiments were carried out to investigate the effect of nitrite on N2O generation and emission during denitrifying phosphorus removal. Compared to NO3-N, N2O emission was much higher when NO2-N was used as the electron acceptor. N2O emission had no obvious difference with an increase in the NO2-N concentration (5, 10, 20 and 40 mg/L), with the emission factor of 2.29%-3.25%. However, N2O generation increased with increasing NO2-N concentrations, with concentrations of 3.35, 5.55, 6.16, 8.18 mg N2O/L, respectively. With the initial anaerobic dosage acetate concentration of 100, 200 and 400 mg/L, the N2O emission factor was 3.95%, 3.16% and 3.08%, respectively, and the generated dissolved N2O concentration was 7.13, 13.48 and 12.31 mg N2O/L.
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