For time
dependent concentration measurement, 1 L of raw biogas was flowed
through 5 g each of the adsorbed phase inside a U tube. Sets of experiments
were repeated by pressing one the liter gas through the tube
with various time durations ranging from 2 to 24 h. In this step the
gas flow rate was controlled by external pressure.
To obtain and detect the best results we repeated each experimental
step by three times. The best data obtained from the gas chromatographic measurement were used for analysis. The pressure
was maintained to be constant and steady, as the fluctuation is pressure
was found to significantly affect the removal efficiency. The highest
concern was given to maintain the air tight condition to obtain the
best and consistent result.