Project description
Energy and nutrient efficiency of liquid manure (ENEGÜLL)
Legislation is placing increasingly stringent requirements on farmers and biogas plants with regard to efficient nutrient utilisation. Although biogas plants can utilise slurry and manure, their use is limited: High nitrogen contents inhibit methane formation, and the low energy content of liquid manure often requires expensive and land-intensive construction measures for expansion. This further restricts the acreage available for primary agricultural production. This creates double pressure for farms - there is a lack of land for spreading slurry and manure as well as land for growing fodder crops.
The aim of the project was to treat slurry and manure before or during the biogas process in such a way that nitrogen, phosphorus and water are removed from the substrate as effectively as possible. This was intended to increase the use of slurry and manure in biogas plants and at the same time reduce the proportion of maize. It was also planned to use the processing to obtain specifically defined fertiliser products that could be used in crop production.
The operational group came to the following conclusions during the course of the project: Processing slurry and manure before it is used in the biogas plant is feasible and makes sense. This not only saves storage space, but also produces the farm's own fertiliser.
Further results and a detailed project description can be found in the attached final report and practice sheet.
