Application of humic substances in the biogas desulphurisation

Journal
GWF, Gas - Erdgas  
Volume
151
Issue
10
Start Page
624
End Page
629
Citation
GWF, Gas - Erdgas 10 (151): 624-629 (2010-10)
Desulphurisation of biogas is needed to prevent corrosion and avoid toxic concentrations. High concentrations of hydrogen sulphide (H2S) cause problems to the incineration process. When biogas is turned, sulphur dioxide and sulphur trioxide are emitted which are even more hazardous to air pollution than H2S. The sulphurous acid formed is highly corrosive. When upgrading biogas to biomethane an effective and economical desulphurisation is also needed. Biogas has typical H2S concentrations from 1000 to 3000 ppm. Within this paper the biological desulphurisation with addition of humic substances is presented. The idea concerns the optimising of the biological treatment with a usage of adapted washing liquids in a bioscrubber to improve the absorption of H2S. Bioscrubbers can be built smaller, thereby reducing the costs. Regeneration by microorganisms is a low cost possibility. Analyses proved humic substances to be an effective solubiliser. Compared to other desulphurisation methods, this bioscrubber-system has high advantages because of its environmentalfriendly usage. Particularly in comparison with other biological treatments, an addition of humic substances is really efficient.