NOVELTY - An aqueous liquid dispersion of organic material is separated into a concentrated solid fraction and a solid poor liquid fraction by an optional coagulation and flocculation operation, a preliminary mechanical separation operation, and subsequent membrane filtration. The preliminary mechanical separation comprises mild dewatering operation(s) and the subsequent membrane filtration comprises vibrating membrane filtration.    USE - Method for separating an aqueous liquid dispersion of organic material, including manure or its fermentation digestate and/or fermentation digestate of an organic dispersion, into a concentrated solid fraction and a solid poor liquid fraction (claimed).    ADVANTAGE - The synergetic combination of a preliminary mechanical separation based on a mild dewatering operation and of a subsequent filtration based on vibrating membrane filtration avoids clogging of and (bio)fouling on filtration membranes. The separation operation can deliver a solid fraction with a high dry matter quality and a pasteurized liquid fraction with a very low dry matter quality. This improves the drying method and the remaining heat of the cogeneration engine, and can thus have enough energetic power to dry and pasteurize the end product, after separation and membrane filtration. The mild dewatering operation achieves a liquid fraction containing less than 2% dry matter.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a separation installation for separating an aqueous liquid dispersion of organic material into a concentrated solid fraction and a solid poor liquid fraction, comprising a mechanical primary separator and a subsequent membrane filtration unit, where the preliminary mechanical separator comprises mild dewatering separator(s) and the subsequent membrane filtration unit comprises a vibrating membrane filtration unit;    (2) a method for an integrated energy efficient treatment of manure and/or organic waste stream(s), comprising performing biofermentation to recover generated biogas, producing electricity production from the biogas with a generation engine also producing heat, separating slurry obtained from biofermentation into a moist concentrated solid fraction and a solid poor liquid fraction, using a preliminary mechanical separation operation and a subsequent membrane filtration, and drying the moist solid fraction using heat; and    (3) an integrated treatment installation for an integrated energy efficient treatment of manure and/or organic waste stream(s), comprising a biofermenting unit with recovery of generated biogas, an electricity generation engine operated at least partially with the recovered biogas, a primary mechanical separator and a subsequent membrane filtration unit for separating the slurry obtained from the biofermentation unit, and a dryer for solid fraction operated at least partially with heat generated by the generation engine.    DESCRIPTION OF DRAWING(S) - The drawing shows an overall schematic flow diagram illustrating the mass balance of the treated materials.