3.5. Biogas Upgrading
The gas was upgraded by a series of cleaning devices, water vapour was removed using analytical grade sodium
sulphate (NA2SO4), H2S removed using iron oxide and CO2 using 15% sodium Hydroxide solution (NaOH).
Table 2 and Figure 6 present data for upgraded gas. There was increase in the methane content by between 21% -
23%.