Why treat slurry


The volatility of farm- slurry and- manure (also called organic fertilizer) is an important source of loss of many nutrients for Swiss agriculture.

Each calendar year, between three and four dozen kilotons of nitrogen (Ntot) are lost in form of ammonia gases (NH3-N). This means a considerable financial loss for Swiss farmers and their farm-units and results in a reduction in productivity. At the same time, greenhouse gas emissions have a negative impact on the environment, especially water Rivers and near-natural ecosystems.

Benefits of a slurry acidification system

  • Reduces significantly the evaporation of ammonia, methane and nitrous oxide

  • Limits odors in the stable, in the storage, in the application and thus in the surrounding farm-area

  • Destroys the fibers of plant residues in the slurry (less “trail” by the spreading)

  • Separates the slurry into solid and liquid parts and sifts out the phosphorus (optional)

  • Increases the proportion of readily available nitrogen, phosphorus and sulfur (means more yield)

  • Enables better and faster nitrogen uptake by crops (means a higher protein content in arable crops)

  • Generates healthier air in the barn and ensures fewer flies and also fewer diseases in farm animals

  • Improves the overall balance of greenhouse gas emissions and CO2 equivalents of the farm

With the VERA declaration of verification, “slurry acidification” as an environmental technology has achieved international acceptance of environmental efficiency and operational stability.

In the European Interreg project “Baltic Slurry Acidification”, authorities from several Northern European countries have been researching how nitrogen losses can be further reduced when fertilizing with organic fertilizer. The results of the extensive study today include the foundations of the European Common Agricultural Policy (CAP) as well as those of our climate and energy policy framework up to 2030.

In Switzerland, these verification statements are taken over by other institutions. For example, a demonstration plant is currently being operated in the canton of Lucerne, which is intended to show the effects of slurry acidification. The scientific evaluation of the slurry processing of the demo object is led by the HAFL, University of applied Sciences in Agriculture, Forestry and Food.

Sustainable development from which everyone involved
– in the form of an economic, ecological and social return – can benefit and grow. This is what we stand for!

For people, your livestock and our environment

The technologies and processes are developed and built in Switzerland


HerausforderungenThe implementation of a slurry processing plant – further defined as slurry acidification plant – is closely linked to the fertilizer balance of the respective farms. As a result, it seems certain that the nutrients N, P, K and S need to be considered more closely.

Basically the importance lies – among governments and the WHO (World Health Organization) – in the fact that no over fertilization is generated and that the various EEC guidelines for 8 “clean” groundwater – with i. e. max. 250 ppm sulfur sulfate or for nitrates max. 50 mg / liter – must be adhered to.

Process / basis

Prozess-GrundlageThe technology of our processing plants – in which raw slurry is acidified – was developed and patented in Denmark a decade ago. These have been continuously developed and now enable their use specifically in the production of two animal species:

Cattle farming and
Pig farming