Methane and carbon dioxide emissions from closed landfill in Taiwan

The atmospheric concentrations and emission rates of CH4 and CO2 were studied at three sites of the Fu-Der-Kan closed landfill and after as the multi-use recreational park in northern Taiwan. Atmospheric CH4 and CO2 concentrations of closed landfill were 1.7–4.6 and 324–409 ppm, respectively. CH4 and CO2 emission rates ranged from 8.8 to 163 mg m−2 h−1 and from 495 to 1531 mg m−2h−1, respectively. Diurnal variation was noted with higher values at night than those in daytime. After creation of the park, atmospheric CH4 and CO2 concentrations were 1.8–3.1 and 332–441 ppm, respectively. CH4 and CO2 emission rates ranged from −1.1 to 2.3 mg m−2 h−1 and from −135 to 301 mg m−2 h−1, respectively. There were no notable diurnal variations in either atmospheric concentrations or emission rates.