NOVELTY - Plant derived industrial waste is washed with acidified water (pH 4-5.5) to remove alkaloids (polyphenols), sugars and fibers, and treated enzymatically with endoproteases (hydrolysis degree of 25-40%) to form solid phase consisting of non-solubilized proteins, starches and insoluble sugars, and liquid phase containing solubilized peptones at a concentration of 60-80% of insoluble starting protein.    USE - In food industry, medical-pharmaceutical industry and chemical industry. The product resulting from the modification of the proteins of industrial organic waste is used in human and animal nutrition, clinical nutrition, nitrogenated fermentation source in the pharmaceutical industry, and soluble organic fertilizers.    ADVANTAGE - The process enables direct solubilization of protein of organic industrial waste, continuously with the production of soluble peptones from the wastes.    DETAILED DESCRIPTION - Continuous direct protein solubilization of plant derived industrial waste, involves;    (1) washing waste with acidified water at pH 4-5.5, for removing alkaloids such as polyphenols, sugars and fibers, and    (2) enzymatic reaction with endoproteases which attain degree of hydrolysis of 25-40%, to obtain a liquid phase and solid phase.    The liquid phase containing solubilized peptones, at a concentration of 60-80% of the insoluble starting protein, is filtered, sterilized, evaporated and concentrated to a powder. The solid phase contains non-solubilized proteins, starches and insoluble sugars.    An INDEPENDENT CLAIM is also included for use of the solid phase as feed in animal nutrition, particularly of grass-eating animals.    DESCRIPTION OF DRAWING(S) - The figure shows separation tank (TES) with aeration, pH control and mechanical separation of floating elements: lignocellulose fraction or low density insoluble fraction (FLC); soluble fraction (FS); protein fraction (FP); decanter (D1) where solids are separated by centrifugation; air (A); organic waste (R); separation tanks (TN1), TN(i), where (i) represents the number of washing stages where washing takes place with acidified water. Protein concentrates (S11, S12, S13); FS+RP recycled (E11, E12, E13); FS eliminated from each cycle (L11, L12, L13).