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Significant amounts of nitrous oxide (N 2 O), a greenhouse gas, have been found emitted from some biological nutrient removal (BNR) processes, especially the simultaneous nitrification denitrification (SND) process. In this study, factors affecting N 2 O emissions including the aeration rate, the feeding pattern and pH were investigated in a simultaneous nitrification, denitrification and phosphorous removal (SNDPR) process using a hybrid sequencing batch reactor (SBR). The results suggest that using operating conditions of a lower aeration rate, continuous feeding and higher pH are strategies which could successfully reduce the emission of nitrous oxide.

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