Removal of high concentrations of sulfur or H2S out of biogas is an important step in emission treatment. Such high concentrations of sulfur or H2S can be found in:

  • biogas plants
  • food industry

The danger of H2S

Everyone is familiar with the typical odor of rotten eggs.  Responsible for this sulfur odor is H2S or hydrogen sulfide, a toxic and flammable gas. This element is toxic to humans and to most animals. Hydrogen sulfide results from the decay of many sulphur containing organic substances, such as proteins. Therefore, it is necessary to separate this H2S by means of biogas desulfurization. Removing the sulfur will firstly solve the toxicity problem and secondly the odor nuisance problem.

How is sulfur removed from biogas?

For the separation of H2S, a gas scrubber installation is used to absorb the sulfur or hydrogen sulfide from the biogas. Such an installation consists of one or more gas scrubbers (washing stages). Furthermore, an aeration basin can be included.

Sulfur removal efficiency with a biological air scrubber

With this method the removal efficiency is around 95%. Which means that no more odour is released into the environment. A fact that can easily be checked by means of a simple odour measurement or olfactometry.

As no chemicals are involved in biological scrubbing, this separation technique is featuring a very low operating cost.

H2S removal efficiency with a chemical gas scrubber

In certain cases, hydrogen sulfide cannot be separated with a biological air scrubber. Then, a single- or multi-stage chemical gas scrubber can be a good solution.

Task is always providing tailor-made solutions, to ensure that the odor nuisance for the environment is no longer perceptible. Of course, this can also be demonstrated by means of simple odour measurements or olfactometry. Contact us for further information.