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Desulphurisation


Although carbon dioxide is the major contaminant in the raw biogas during the production of biomethane, it has been shown that the removal of hydrogen sulphide can be of crucial importance for the technological and economic feasibility of the whole gas upgrading chain. Of course, this behaviour strongly depends on the sulphur content of the used substrate and the continuity of the fermentation process. Hydrogen sulphide is a hazardous and corrosive gas that has to be removed from the gas prior to any further utilisation, whether its grid injection or CNG-fuel production. A number of technologies are readily available to fulfil this task. Depending on the local circumstances of the anaerobic digestion plant and the biomethane production unit, one technology or a combination of two or even more technologies for biogas desulphurisation have to be applied to realise a technically stable and economically competitive solution. The most important methods are presented in the following section; the applicability to biogas upgrading for grid injection has been required for this assessment.

The following technologies are currently state-of-the-art: