A selection out of the projects:


  • Testing of struvite forming influence on the dewatering of digested sludge from a sewage treatment
  • Determining the best location for a struvite process without a sewage sludge digestion
  • Pilot study of nutrient removal in a digester with co-fermentation (article WorldWater 2012)
  • Design of CO2 and NH3 strippers
  • Design of NH3 scrubbers
  • Design of biogas scrubbers
  • Application of full-scale air cleaning systems for pigsstables (more than 25 installations in use).
  • Separation of minerals from manure (see case study below)



Mineral Separation Plant


The Netherlands has an increasing surplus of manure. It is essential that the manure is used in a sustainable manner, for example with the production of biogas. While the potential is high, the number of fermentation plants in the Netherlands is still limited (180).

To achieve the optimum fermentation process, which produces a gas with the appropriate caloric value, the manure is often mixed with other organic matter and water (co-digestion). The disadvantage of this co-fermentation is that the amount of minerals in the digital state increases, giving the farmer an extra minerals.

The goal of this project is to develop a system which can split the  digestate from a digester in a profitable way, into various useful nutrients such as nitrogen, potassium, phosphate and organic residues. Through this innovative development it will become more profitable to invest in a bio-fermentation system. The residue which is expensive for farmers, is converted by the installation from cost to income.

The project is divided into several stages. A brief evaluation is organized after each stage.

  • Phase 1 Preparation and design. Analyze the process parameters and aftertreatment technique of the digistate. Then the final process sequence is determined and the pilot is designed. In this phase patent research and application is also carried out.
  • Phase 2 Development. This phase covers the engineering of the mineral separation installation and the construction of the pilot setup.
  • Phase 3 testing. The mineral separation installation is connected to the co-digester. After this step testing will take place, both the process and the produced minerals are tested. Then the process will be optimized further.
  • Phase 4. Research and evaluation process. Protocols will be established.

The project should eventually lead to the following results:

  • A functioning prototype of the mineral separation plant.
  • Marketable products originating from the mineral separation plant;
  • A blueprint for developing a commercial mineral separation plant.

If the project is successful it will be considered how this new finding is best marketed. This could include collaborations with fermentation producers or obtaining a license for the product.

The separated minerals (in pellet form or dissolved) need to be removed from the installation so it can be  stored. After storage, the minerals may be transported to fertilizer plants, fellow farmers or can be used on private property.

ProfiNutrients BV is the initiator of this project, in close cooperation with VOF Franico Horticultural and dairy farm from Gebroeders Groot out of Hoogwoud.
ProfiNutrients is among others responsible for the information reporting in this project.

For more information you can contact us at This email address is being protected from spambots. You need JavaScript enabled to view it.
The project has the explicit support from the Ministry of Economic Affairs, Agriculture and Innovation (www.rijksoverheid.nl / eleni) and is responsible for POP2 in the Netherlands.

This project is also supported by the European Agricultural Fund for Rural Development
European Agricultural Fund for Rural Development: Europe investing in rural areas "