Greenhouse gas emissions from a constructed wetland for municipal sewage treatment.
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) g CH4/a, which was emitted from the constructed wetland with the area of 495,000 m2 and wastewater loading rate of 12,000 m3/d. Its daily mean methane flux reached 5.22 g CH4/(m2.d), 250 times as much as that in natural wetland in the same latitude region. 227.8 mg CH4 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 N2O/L.
Tai
Pei-dong
PD
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110015, China. Peitai@iae.syb.ac.cn
Li
Pei-jun
PJ
Sun
Tie-heng
TH
He
Yao-wu
YW
Zhou
Qi-xing
QX
Gong
Zong-qiang
ZQ
Mizuochi
Motoyuki
M
Inamori
Yuhei
Y
D000393:Air Pollutants / Q000032:analysis*; D003247:Conservation of Natural Resources; D004784:Environmental Monitoring; D017752:Greenhouse Effect; D008697:Methane / Q000032:analysis*; D009609:Nitrous Oxide / Q000032:analysis*; D012722:Sewage; D014865:Waste Disposal, Fluid
D000393:Air Pollutants; D012722:Sewage; D009609:Nitrous Oxide; D008697:Methane