NOVELTY - Method for separating suspended solids from thin stillage involves clarifying thin stillage product having total solid content of 30-90 wt.% in mechanical processor to produce fine suspended solid stream and clarified thin stillage, providing the thin stillage product and the clarified thin stillage separately or in combined stream to one or more evaporators to produce one or more reduced suspended solid streams, and optionally subjecting at least one of the two reduced suspended solid streams for mechanical processing to produce bio-oil product.    USE - The method is useful for separating suspended solids from thin stillage and producing a product chosen from clarified concentrated thin stillage, fine suspended solid stream, molasses, dry distiller solubles containing single cell proteins, wet cake product, distiller dry grain solubles and their combinations and for producing bio-oil (corn oil) product, and other bio-product, preferably biofuel or biochemical (all claimed). The bio-product includes alcohol, preferably butanol. The biofuel includes biodiesel, bioethanol, biogasoline, biomethanol, biobutanol and biogas.    ADVANTAGE - The method reduces dryer load in bio-product production facility and emission in bio-product production facility, improves bio-product production yield, reduces viscosity of the streams (thus allows efficient dewatering process and reduces natural gas cost for dryers), and is cost-effective.    DETAILED DESCRIPTION - Method for separating suspended solids from thin stillage involves clarifying thin stillage product in mechanical processor to produce fine suspended solid stream(s) and clarified thin stillage, where total solid content of the stream is 30-90 wt.%, and comprises suspended solids (less than 25 wt.% of total solid content) and dissolved solids, providing the thin stillage product and the clarified thin stillage separately or in combined stream to one or more evaporators to produce one or more reduced suspended solid streams, where each streams has reduced amount of suspended solids and lower viscosity as compared to process stream having comparable total solid content containing higher amount of suspended solid, and optionally subjecting at least one of the two reduced suspended solid streams for mechanical processing to produce bio-oil product. INDEPENDENT CLAIMS are included for the following:    (1) product obtained by the above-mentioned method; and    (2) stillage processing system.