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What is Biorefining?

Biorefinery is a process technique in which biomass is separated into several valuable components. Grassa developed a biorefinery technique that is especially suitable for 100% processing local available grass and vegetable residues into equivalent or better substitutes than expensive imported products such as high-quality protein as a substitute for South American soy in animal nutrition.


Grassa's own biorefining technique for grass and vegetable residues

Grassa’s unique biorefinery technique first bruises and then squeezes the green raw material, such as grass, resulting in two separate products: fiber and juice. Because grass consists largely of water, a lot of juice is released containing proteins, sugars and minerals. These substances are suitable for use for various purposes.

GRASSA’s refinement process has essentially been kept as simple as possible to achieve a robust, easily applicable technology.

The mowed grass is first bruised and then pressed; the juice is separated from the fibers. The fibres, with a high content of protein (15%)  in the grass, can be packed to preserve it. Some of the nutrients are extracted with the juice. These nutrients include proteins, sugar and minerals. The juice is then further processed by separating and concentrating the proteins. The liquid that remains is called GRS Protein. This is a high-quality protein with a balanced amino acid profile and a high content of fatty acids and vitamins. It can be used as a substitute for South American soy in feed for pigs and chickens, but also for pet food and fish. This product can also be further treated. Phosphate is still in the solution and can be removed from it. The low-phosphate residue is then separated into a sugary fraction (GRS FOS), a mineral-rich fraction (GRS Minerals) and clean water. These components are useful in pet food and horticulture, among other things.   

Processing grass and vegetable residues into valuable products

Grassa used existing proven techniques such as extrusion, coagulation separation, nanofiltration and reverse osmosis in the development of her own biorefinery technique. She developed it into her own applied biorefinery technology for the processing of grass and vegetable residues. Grassa’s biorefinery technique is in the scale-up phase. In 2021 and 2022 Grassa will only supply test badges of dry protein and carry out tests in practice. Grassa expects to produce commercially from 2023.