NOVELTY - Separating (P1) aqueous slurry of organic origin, containing water, and inorganic components as well as organic matter, involves (a1) adding to the slurry additive selected from water-miscible solvents; (b1) separating the obtained mixture into a liquid fraction containing most of the additive added, and a semi-solid fraction; and (c1) subjecting the liquid fraction obtained in (b1) to a process for removal of both the additive and the ammonia contained init, and obtaining a liquid product for disposal into the environment, optionally after further treatment.    USE - For separating aqueous slurry of organic origin, containing water, and inorganic components as well as organic matter (claimed) which is useful as a crop fertilizer.    ADVANTAGE - The method of separating an aqueous slurry of organic origin such as for instance animal manure, into (i) a liquid fraction where the K, P, N content of the liquid fraction is drastically lowered as compared with the same in the slurry, which liquid fraction is suitable for disposal into the environment, and (ii) a semi-solid fraction having lowered water content and is suitable as a crop fertilizer.    DETAILED DESCRIPTION - Separating (P1) aqueous slurry of organic origin, containing water, and inorganic components as well as organic matter, comprising in mineral salts potassium (K), phosphorus (P), and nitrogen (N) and organically bound nitrogen (ammonia), and dry and/or dissolved organic and inorganic matter including ammonia, where the slurry is separated into a liquid fraction including little or no dry organic matter and a semi-solid fraction, involves (a1) adding to the slurry 25-250 vol.%, preferably 50-200 vol.%, especially 70-150 vol.% additive selected from water-miscible solvents consisting of methanol, ethanol, 1-propanol, 2-propanol, and/or acetone; (b1) separating the obtained mixture into a liquid fraction containing most of the additive added, and a semi-solid fraction; and (c1) subjecting the liquid fraction obtained in (b1) to a process for removal of both the additive and the ammonia contained init, and obtaining a liquid product for disposal into the environment, optionally after further treatment.