Donau Bellamethan® combined with an active carbon filter

Do you feed into the gas network or do you want to improve your gas quality in the future?

We offer a complete solution for your biogas production!

Hydrogen sulphide, ammonia and also siloxane both disrupt the production of methane and also store up in the gas motor, increasing the frequency with which the oil needs to be changed and in the worst case scenario leading to the destruction of the motor.

Which input materials cause H2S?

Some substrates can be named which cause increased formation of H2S when they are used.

  • Protein-rich substrates in general
  • Chicken and poultry dung
  • Grain
  • Slaughterhouse waste
  • Glycerine
  • Molasses or slop from the sugar industry

Be very careful when using these products for the first time. For example, when using poultry dung, the H2S content can very quickly rise to very high levels (> 1000ppm)
Donau Bellamethan can be used to reduce sulphur when the sulphur levels are high. The product, which is based on iron chloride, quickly and reliably reduces the H2S content. Donau Bellamethan®'s acidic nature mean that it also decreases the ammonia content.
Surface layers can also develop when using protein-rich substrates, or foam can form in the fermenter. Surface layers prevent the biogas which forms from reaching the gas compartment, reducing the gas output.
Donau Bellamethan® plus helps you to combat these problems.
Additional active carbon filters can be used for sulphur contents of less than 500ppm. These are used for fine desulphurisation and reduce the H2S content to as low as 0ppm.

What is activated carbon?

Active carbon is a material which is extremely porous. The large inner surface enables the adsorption of many substances during the gas phase.
As a comparison: an inner surface of just 5g of active carbon corresponds to the surface of an entire football field.
Shaped active carbon is used for biogas desulphurisation and active carbon impregnated with potassium iodide is used specifically for the removal of H2S. In addition to this, the active carbon also removes the ammonia.

In this way, H2S and also thiols (sulphur-alcohol compounds) are converted to elementary sulphur or disulphides by a catalytic oxidisation process within the pore system. The presence of twice the stoichiometric amount of O2 is necessary for this, and the ideal temperatures are between 10-70°C.
Loading of well over 60% by weight of sulphur is possible.
Increased numbers of silicone-organic compounds known as siloxane occur in substrates such as used grease and waste products which are used as coferments.
Burning siloxane results in fine crystal SiO2, which may be deposited on the cylinders and pistons in the motors, for example, and cause damage.
Active carbon can be used to filter out the last remaining inhibitors, meaning the biogas is as well prepared as possible for further processing.

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