Abstract: The invention pertains to a method for processing of organic materials containing nitrogen compounds, where the organic material undergoes an anaerobic digestion with simultaneous liberation of biogas which contains methane and carbon dioxide. The liquid product obtained after anaerobic digestion is, according to the invention, heated to boiling temperature, ammonia bonded as carbonate which is distilled off, and the tail product from distillation is further processed to the valuable product and clear water or is discharged as prepurified waste water. During the processing to the valuable product in the form of organo-phophate-lime concentrate, the tail product of distillation is alkalized by lime and carbonized with carbon dioxide. Biogas or carbon dioxide obtained by distillation may be used in carbonation.