N[sub.2]O Emission from Partial Nitrification and Full Nitrification in Domestic Wastewater Treatment Process

Using actual domestic wastewater as the research object, nitrogen compounds and their combinations were added to different nitrification (partial nitrification, full nitrification) processes to investigate nitrous oxide (N[sub.2]O) emission and its nitrification mechanisms. The presence of influent NH[sub.4] [sup.+] was the driving force of N[sub.2]O emission during nitrification. Compared with full nitrification, NO[sub.2] [sup.−] in partial nitrification more readily generated N[sub.2]O by denitrification. Under the proportional gradient of NH[sub.4] [sup.+]-N:NO[sub.2] [sup.−]-N/NO[sub.3] [sup.−]-N, 30:0, 20:10, 10:20, and 0:30, total N[sub.2]O emissions during partial nitrification were 2.81, 11.30, 65.20, and 11.67 times greater than the total N[sub.2]O emissions during full nitrification. Full nitrification was more beneficial to N[sub.2]O emission reduction. This provides a control strategy for N[sub.2]O emission reduction in wastewater treatment processes under the background of reducing the production of greenhouse gases.