TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Method: In the method above, the filter device is a rotary drum filter device. The saccharified biomass comprises sugars selected from glucose, xylose and their mixture. The saccharified biomass comprises an aqueous solvent or a non-aqueous solvent. The saccharified biomass includes cells. The saccharified biomass includes cells selected from yeast cells, bacterial cells, fungal cells or their mixture. The saccharified biomass includes protein material, where the protein material is substantially denatured protein material. The protein material includes an enzyme material. The saccharified biomass includes a fermentation product. The saccharified biomass includes an alcohol, where the alcohol is ethanol or butanol. The saccharified biomass includes an organic acid, such as butyric acid. The saccharified biomass is substantially devoid of one or more soluble sugars from which the biomass is composed, where the saccharified biomass is substantially devoid of glucose. The saccharide biomass is substantially devoid of xylose. The biomass has been saccharified using one or more saccharification agent. The saccharification agent is selected from enzymes, acids, bases, oxidants and their mixture. The saccharification agent includes sulfuric acid and an enzyme. The saccharification agent is a cellulolytic enzyme. The biomass has been treated to reduce its recalcitrance prior to saccharification, where recalcitrance has been reduced by the application of electron beam radiation to the biomass. The filter device comprises a rotatable drum having a filter face through which liquid of the saccharified material can pass, while retaining solids of the saccharified material on it, where the filter face has a filter aid extending outwardly from it. The filter aid covers substantially the entire filter face of the rotatable drum. The filter aid is selected from diatomaceous earth, celite, silica, pumice, perlite, alumina, zeolites, sand, cellulosic material, lignocellulosic material, and their mixture. The filter aid extends from the filter face a distance of 0.5-250 mm, preferably 2-25 mm. The rotatable drum includes an inner portion and where the inner portion is maintained at a lower pressure than the filter face, where the pressure difference between the inner portion and the filter face is maintained at 20-25 inches of Hg. The inner portion is in communication with a vacuum pump and/or a vacuum source. The filter face includes a filter cloth, where the filter cloth is a woven cloth, and where the cloth has a weave selected from a twill weave, a plain weave, a satin weave, a knot weave, a basket weave, an oxford weave and combinations of these. The filter cloth has a porosity rating range of 1-100 CFM/ft2 can be utilized (e.g., 1-3, 1-10, 10-30, 15-20, 30-50, 30-40, 50 to 70). The filter device includes a knife for continuously removing the solids deposited on the drum face as the drum is rotated relative to the knife, where the knife moves in a direction perpendicularly towards the drum face at a rate adjusted to continuously removes an interfacial region comprising the solids of the saccharified material and the filter aid. The method further comprises utilizing a vibratory screener to remove solids from the saccharified biomass prior to and/or after applying the saccharified biomass to the outer portion of the filter device. EXAMPLE - No suitable example given.