Manure fermentation on farm scale in Bathmen


Manure fermentation on farm scale in Bathmen

CCS Energie-advies has been commissioned for the realization of a digester in combination with a manure processing installation. Partnership Nijkamp-Marsman in Bathmen near Deventer was the client of this challenge.

This project proves that mono-manure fermentation can be made profitable if the biogas is used optimally. In this case it is converted into heat for the manure processing. The part of the biogas (about 50%) that is not needed here goes to a biogas hub. The realization of this is scheduled for next year. This hub will supply biogas from five farms from the outlying area to the industry in Deventer.

Not only a wonderful project for the farmer, but the whole local area benefits from sustainable biogas. The project is twice as special because it uses mono manure fermentation, where only liquid manure is fermented.

In reality the manure processing consists of three steps. The manure is first fermented. In fermentation, manure is brought into a heated tank, where bacteria break down a part of the biomass and produce biogas. The digestate is then separated into a thick and thin fraction. Finally, the thin fraction goes to the manure processing plant. CCS Energie-advies has developed the Bio-NP concept specifically for this purpose. With this concept, as much phosphate as possible is removed by converting it into phosphate fertilizer: struvite. Subsequently, the thin digestate is heated with biogas, causing the ammonia to evaporate. This is washed out with sulfuric acid, resulting in the fertilizer: ammonium sulfate.

The plant will soon produce the following products: biogas for Deventer, thick fraction of manure for the land, a phosphate fertilizer, a nitrogen fertilizer dust and a mineral-poor thin fraction (irrigation water).

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