Desulfurization, binding of hydrogen sulfide including trace elements
In addition to methane and carbon dioxide, the biogas produced during fermentation also contains hydrogen sulfide in different concentrations, depending on the substrate used. Typical concentrations in renewable energy plants are between 500 and 3000 ppm. Typical sources of sulfur input are protein and fat-rich substrates, but also dry chicken manure (HTK).
Sulfur deposits z. B. on floating layers or deposits on nets caused by air desulfurization are often stirred back into the fermenter and can react in the fermentation substrate.
The effects of high hydrogen sulfide concentrations are diverse:
Disruption of microbiology
-> Disturbance of methane formation, loss of performance -> Precipitation of trace elements, thus increased need -> H₂S
has a toxic effect on methane bacteria
Acidification of the engine oil
-> Damage to engine parts, loss of warranty -> Shortened running times or higher repair intervals
Impairment of the system technology
-> Damage to components up to total loss -> Corrosion in the system -> increased environmental pollution through emissions (TA-Luft, BimschG)
Suphur-Ex plus
binds hydrogen sulfide in biogas plants.
This is already bound in the liquid phase and precipitated as iron sulfite.
The escape of hydrogen sulfide can thus be prevented both in the biogas and in the liquid phase and all trace elements can no longer be precipitated. The methane formation is not prevented, which results in consistently high methane levels in the biogas. The high iron content (at least 37% Fe in DM) makes the use of Sulfur-Ex plus particularly efficient and cost-effective.
benefits
-> highly effective reaction agent for binding hydrogen sulfide in the liquid phase -> better availability of trace elements (cost savings) -> Optimization of methane formation -> longer service life of the system technology -> simple dosage (bagged goods, BigBag, earth-moist in the truck) -> neither caustic nor corrosive
dosage Sulfur-Ex plus is added directly to the fermenter with the substrate. It is not hazardous to water and its chemical properties are not dangerous.
The dosage of Sulfur-Ex plus depends on the hydrogen sulfide content of the fermentation substrate and must be recorded individually.
