The Bureau of Sewerage, Tokyo Metropolitan Government, has been implementing various measures to reduce greenhouse gas (GHG) emissions. However, measures to reduce Nitrous Oxide (N 2 O) emission from wastewater treatment, which amounts to about 16% of the GHG emission from the Bureau, has been delayed since little is known about its behaviors and factors which affect its emission. The Bureau installed continuous N 2 O analyzer in a wastewater treatment plant (WWTP), and conducted continuous measurement of N 2 O emission for one year. The results showed that N 2 O emission fluctuated significantly and was affected by nitrogen load of influent and nitrification condition in reaction tank.
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