Organic input materials like foodstuff remnants, fats or sludge are often fed into the biogas plant as substrate. Renewable resources like corn, beets or grass function feed both for animals like cows and pigs also as for the micro organisms within the biogas plant.
Manure and dung also are fed into the biogas plant. In the fermenter, heated to approx. 38-40 °C, the substrate is decomposed by the micro organisms under exclusion of sunshine and oxygen. the ultimate product of this fermentation process is biogas with methane because the main ingredient.
But aggressive hydrogen sulphide is additionally contained within the biogas. A fermenter made from chrome steel has the clear advantage that it withstands the attacks of the hydrogen sulphide and is usable for many years . Furthermore, a chrome steel fermenter provides the chance to operation the biogas plant also within the thermophile temperature range (up to 56 °C).
Once the substrate has been fermented, it’s transported to the fermentation residues end tank and may be retrieved from there for further utilisation. The residues are often utilised as top quality fertiliser. The advantage: Biogas manure features a lower viscosity and thus penetrates into the bottom more quickly. Furthermore, the fermentation residue very often features a higher fertiliser value and is a smaller amount intense to the olfactory senses. But drying it and subsequently using it as dry fertiliser is additionally an option.
The biogas generated is stored within the roof of the tank and from there it is burned within the combined heat and power station (CHP) to get electricity and warmth . The electric power is fed directly into the facility grid. The heat generated are often utilised to heat building or to dry wood or harvest products.