A method for processing thin stillage (TS), characterized by the following steps: a) feeding of thin stillage (TS) into a working vessel (3)； b) concentrating of thin stillage (TS) in a filtration unit (9)； and c) returning of a first substream of concentrated thin stillage to the thin stillage (TS1) present in the working vessel (3) in order to adjust the solids content, and apparatus for producing a protein-containing product of value.
