TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Components: The thin stillage is prepared by (a) fermenting carbohydrate-rich biomass material using a microorganism in an aqueous solution to obtain ethanol-containing beer, (b) distilling the beer to remove the ethanol to obtain thin stillage, (c) optionally removing suspended solids from the thin stillage, and (d) optionally removing macromolecular solutes from the thin stillage. The carbohydrate rich-biomass comprises starch as major carbohydrate. The carbohydrate rich-biomass comprises cellulose as a major carbohydrate. The carbohydrate rich-biomass comprises sucrose as a major carbohydrate. The carbohydrate rich-biomass is a seed. The carbohydrate rich-biomass is a cereal. The cereal is chosen from corn, wheat, rice, barley, oats, Sorghum and their mixtures. The carbohydrate rich-biomass is plant stem or tuber. The stem or tuber is from potato or sweet Sorghum. The starch is converted to glucose by one or more enzymes or catalysts to produce a fermentable sugar. The cellulose is depolymerized by one or more enzymes or catalysts to produce a fermentable sugar. The microorganism is yeast or bacterium. The macromolecules comprise proteins. Preferred Method: The suspended solids are removed from the thin stillage by centrifugation or sedimentation. The macromolecular solutes are removed from the thin stillage by ultrafiltration or nanofiltration. The pH of the thin stillage is increased by 8 or more using waste alkaline solution from biodiesel production. The pH of the thin stillage is decreased to 5 or less. The slurry is heated. The undissolved solids are separated by filtration or centrifugation. The dissolved solids are isolated by ultrafiltration, diafiltration, reverse osmosis or nanofiltration. The dissolved solids are isolated by evaporation, or precipitation. The dissolved solids are precipitated by a change in pH or ionic strength. The contacting of the biomass material with the thin stillage is conducted in a continuous process, batch process or countercurrent process. The contacting of the biomass material with the thin stillage is combined with the preparation of the thin stillage in a continuous process.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The thin stillage further comprises an additive. The waste alkaline solution from biodiesel production is a glycerol/potassium hydroxide solution. The additive is salt, detergent, zwitterions or their mixture. EXAMPLE - No suitable example given.