The aim of this study is to emphasize the potential of membrane technologies and the specifi c performance-limiting borders of pressure-driven (microfi ltration, ultrafi ltration, nanofi ltration, reverse ssmosis) as well as electro-membrane (electrodialysis, electrodialysis using bipolar membranes) techniques for the separation of valuable substances from silage press-juice obtained in green biorefi neries. Depending on the product, nanofi ltration can be considered a partially fractionating technique with great future potential. Electrodialysis turns out to be a suitable separation technique for removing huge amounts of salt and isolating individual valuable substances. However, residual impurities must be taken into account for subsequent separation steps. In any case, further separation processes (e.g. chromatography) must be integrated in future green biorefi nery production plants.