N 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 (N₂O) emission and its nitrification mechanisms. The presence of influent NH₄⁺ was the driving force of N₂O emission during nitrification. Compared with full nitrification, NO₂⁻ in partial nitrification more readily generated N₂O by denitrification. Under the proportional gradient of NH₄⁺-N:NO₂⁻-N/NO₃⁻-N, 30:0, 20:10, 10:20, and 0:30, total N₂O emissions during partial nitrification were 2.81, 11.30, 65.20, and 11.67 times greater than the total N₂O emissions during full nitrification. Full nitrification was more beneficial to N₂O emission reduction. This provides a control strategy for N₂O emission reduction in wastewater treatment processes under the background of reducing the production of greenhouse gases. [ABSTRACT FROM AUTHOR]