Gas samples were taken from the raw gas, product gas and exhaust
gas. The raw gas was obtained from the landfill gas pumping
station after condensation (considered dried gas), while the product
and exhaust gas were from the pilot system. The product gas
sample for trace compound analyses were taken before and after
drying unit. The exhaust gas sample was taken from the desorption
vessel’s purge line which did not have drying unit.
Gas samples for the methane, carbon dioxide, oxygen, nitrogen
and hydrogen sulphide measurements were collected in TECOBAG
(PETP/AL/PE 12/12/75) aluminium gas bags (volume 10 l and 50 l).
Water samples for pH, carbonate and sulphide analysis were
collected from the water storage vessel before and after each trial.
At the end of the trial day water samples were also collected from
the absorption column.