When producing biogas in the agricultural sector, in addition to manure (manure and solid manure), co-fermentation products are also used, which can have an intense odor and disruptive effects on the process (food leftovers, flotate fats, slaughterhouse waste, ...). In addition, certain co-fermentation products or mixtures thereof disrupt the process flow in biogas plants and thus cause great economic damage. Aluminosilicates are successfully used in the area of ​​process stabilization in large-scale sewage treatment plant construction and operation. There are a few different observations and results in agricultural facilities and from laboratory studies.

The entire process flow should be precisely recorded and documented in several agricultural biogas plants. For this purpose, all input and output materials are recorded quantitatively and qualitatively. Important analytical parameters in the fermentation substrate are: pH value, total N, ammonium N, DM content, crude ash, crude fat, crude protein, crude fiber, organic carbon content, sugar, starch, sulfur, fermentation acids and COD value. In parallel, the resulting biogas is recorded qualitatively (sulphur, methane, oxygen) and quantitatively.

All data is collected and documented over a period of 4 weeks with the substrate composition being as uniform as possible. Following this measurement phase, aluminosilicates at 5% based on the oTS are added to the fermentation substrate mixture daily and the fermentation process is analyzed in detail for another 4 weeks. Olfactometric studies will be used to measure the odor formation potential during different treatments of the individual mixtures and end materials, parallel to the analytical surveys.

Using an electronic nose, continuous odor sensory monitoring is set up, which is intended to provide important measurement results regarding extreme operating situations in parallel to the analytical and olfactometric measurements.