Nitrous Oxide Production Characteristic During Endogenous Denitrification

In order to control greenhouse gas emission and improve energy production in wastewater treatment plants,a new method based on nitrous oxide( N2O) oxidizing methane was proposed with an increase in energy production from methane oxidation and a decrease in N2O emission. This study investigated N2O production characteristic during endogenous denitrification. The results showed that nitrite and N2O were accumulated simultaneously when nitrate was used as electron acceptor. Nitrite and N2O reduction were inhibited when nitrite concentration increased in the range of 13- 90 mg / L,resulting in N2O accumulation during endogenous denitrification process. Based on these results,to enhance N2O accumulation by adjusting nitrite concentration was proposed,which could provide the basis of methane oxidation using N2O sequentially.