Abstract
Methane production and concentration from six cells were investigated in two landfills in China. Long-term monitoring tests were
conducted to evaluate the methane recovery efficiency of active wells. Results showed that the recovery efficiency of a wells
distribution simulation method was 75.6% to 83.5%, which was much higher than 50.1% to 53.6% when considering the EPA
method in the EST (Ecological Sludge Evapotranspiration Technology) cover structure. The recovery efficiency of methane in
Cell 1-B in Yang Loo landfill varied from 50.1% to 53.6%, which was much higher than 32.5% to 41.2% in Cell 1 in Chen Gang
landfill adopting the EPA method. The monitoring data and analytical results showed that Numerical Simulation of Gas Volume
Method (NSGV) can perform a more comprehensive evaluation of methane recovery in landfill relative to EPA method, and
cover system produced by EST technology was more efficient in restraining cracking and increasing the methane recovery
efficiency.