SulfothaneTM Low Cost H2S Removal Technology
Biogas is a valuable renewable energy source receiving ever more attention. Biogas can be generated by the anaerobic treatment of industrial wastewaters, by the digestion of manure and other bio-wastes, and is released as landfill gas from covered landfill sites.
Before the biogas can be utilized, it is essential to remove the sulfur compounds, which are mainly present in the biogas as sulfide (H2S). Sulfur can cause severe corrosion in boilers and engines utilizing biogas. Sulfur is an essential nutrient for living organisms, and is found for instance in proteins. During the production of biogas, sulfur is converted biologically to H2S. Fortunately, biological processes can also be used to remove the H2S from the biogas.
FEATURES & BENEFITS
The SulfothaneTM Desulphurization Unit can be seen as a combination of an alkaline washing column combined with a biological production of elemental sulphur in combination with an alkalinity recovery step.
FEATURE OF THE SULFOTHANE™ PROCESS
It is important to note that in the SulfothaneTM process the elemental sulfur is produced in a bioreactor and not in the scrubber itself. Due to this feature, clogging problems that generally occur in conventional caustic or liquid iron based scrubbing systems, are prevented in our scrubber. Overall, the biological produced sulfur increases the operational reliability of the system and enhances the H2S absorption.
BENEFITS OF THE SULFOTHANE™ PROCESS
- Deep H₂S removal efficiency
- No addition of air (N2, CO2 and O2) to biogas stream, therefore very suitable for further biogas upgrading without changing clean biogas flow and composition
- Small footprint
- Most reliable and robust H2S removal process, applicable to high turn down ratios and S-load fluctuations.
- Very fast and stable start-up procedure with small biomass inoculum
- Significant chemical savings (caustic, active carbon, iron ore) leading to much lower operating cost.
- No risk of clogging in the scrubber column
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