Abstract
Energy saving wastewater treatment system has attracted a lot of attention, and partial nitrification- ANAMMOX process has gained notice for its resource and energy saving efficiency from the point of prevention of global warming. In this study, emission characteristics of nitrous oxide (N2O) from both partial nitrification and ANAMMOX process were investigated due to its high greenhouse effect. In addition, microbial communities were analyzed by a next-generation sequencer to comprehend their changes during the reactor operation. As a result, the emission of N2O was detected from both of partial nitrification and ANAMMOX process. In the nitrifying reactor, N2O generation was observed during ammonia oxidization, and there was a high relationship between their reaction rates. In ANAMMOX reactor, which consisted of 4 tanks, N2O was produced mainly in the first tank, however N2O was consumed in the latter tanks after stable biological reaction in the reactor. It is estimated that partial nitrification- ANAMMOX process can generate N2O in both reaction stage, therefore, countermeasures such as enhancing N2O consumption in ANAMMOX process will be required.
