• Compared to liquid manure, digestate is considerably less odour-intensive, since odour-causing compounds are broken down. This leads to lower odour emissions during storage and in particular later during spreading.

• Reduction of methane and nitrous oxide emissions, which can occur with uncontrolled decomposition, e.g. in the storage of liquid manure.
• Digestate is more homogenous and therefore better to spread than liquid manure and more readily available to crops.
• The pH value of digestate is shifted to the alkaline range, so that the corrosive effect, as can occur with liquid manure (important in the case of leaf fertilisation!) is reversed.
• Due to the degradation processes, the nutrients are available in mineralised form (NH₄-N, phosphate, etc.) and can thus be directly absorbed by the crops. Thus the nutrients are recycled and transported back into the soil.
• Digestate replaces expensive mineral fertiliser, which is produced in an energy-intensive process.
• The humus content of the soil is improved by fertilisation with digestate.
• Pathogens and weed seeds are largely destroyed in the fermenter.
• As spreading can only be carried out if the nutrients can also be used by the crops, in moderate to cold climates the digestate must be stored seasonally.
• The digestate can also be separated into solid and liquid digestate if direct application is not possible or not economical. The solid part is turned into compost or dried and used as fertiliser, processed into pellets, used as fuel or fertiliser and as bedding for animals. Where possible the liquid part is used as fertiliser, process water or it can also be processed to industrial water quality, producing a concentrated liquid fertiliser as a by-product.
• The processing (separation, drying, granulation, pelletising) reduces transport costs. Fermentation products can therefore be traded and passed on to third parties more easily.

Whereas in Germany, with almost 9,500 biogas plants (2023), the potential of biogas plants has practically been exhausted, the global demand for biogas plants is increasing due to the demand for renewable, climate-friendly energy and due to the great potential of liquid manure, organic waste in the food industry and organic household waste. Ever since Krieg & Fischer was established in 1999, the company has operated abroad and can now boast more than 175 successful reference projects worldwide, in more than 40 countries.