Affiliations: Institute of Applied Ecology, Chinese Academy of
Sciences, 110015, China. E-mail: [email protected] | National Institute for Environmental Studies, 16-2
Onagawa, Tsukuba, Ibaraki 305, Japan
Abstract: The fluxes of greenhouse gases (methane and nitrous oxide) emission
from a constructed wetland in the Eastern China as municipal sewage treatment
were measured from June 1999 to August 2000 by the closed chamber method. The
constructed wetland for municipal sewage treatment is a significant source of
methane, up to 976.6 x 10^6 gCH_4/a, which was emitted from the constructed
wetland with the area of 495000 m² and wastewater loading rate of 12000
m³/d. Its daily mean methane flux reached 5.22 g
CH_4/(m²·d),250 times as much as that in natural wetland in the
same latitude region. 227.8 mg CH_4 was produced from the treatment of 1 liter
wastewater, up to 700-1000 times as much as that in the secondary treatment.
The emission of nitrous oxide from the constructed wetland is not higher than
that from secondary treatment of wastewater, only 0.07 mg N_2O/L.
Keywords: greenhouse gas emission, constructed wetland, municipal sewage, methane, nitrous oxide
