Purine treatment method for the production of a product with a high calorific value

A method for obtaining a solid biofuel product having a lignin material, from manure of cattle, the method comprising:

• feeding the manure into a washing tank,
• adding, continuously, a flow of water in the washing tank having the fed manure;
• washing, continuously, the manure, in the washing tank by the flow of water, and by moving the manure along with the water to wash the manure using rotary movements, ultrasound energy and water drag, where the washing is performed at ambient pressure and temperature;
• removing, continuously, from the washing tank, the water having contaminants, obtained from the manure to a purifier and accumulator tank, to get clean solids in the washing tank;
• removing excess water from the clean solids by pressing or spinning the clean solids;
• supplying excess water from the clean solids, obtained via pressing or spinning of the clean solids, to the purifier and accumulator tank;
• and
• drying of the clean solids, wherein the clean solids as obtained comprises the lignin material.