From stillage to DDGS: close the solids balance

The ethanol process leaves valuable solids and dissolved material in the stillage. Product quality and energy demand depend on how those streams are separated, concentrated and dried.

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Engineering scope

Whole stillage first separates into wet solids and thin stillage. Evaporation concentrates the thin stream into syrup; the selected proportion is blended with wet solids before drying to DDGS. A wet-feed route changes the dryer requirement and logistics.

The four-effect falling-film arrangement in the Indonesia design reuses vapor across effects. Its design must address distribution, fouling, clean-in-place access and condensate quality. Dryer exhaust collection and dust control belong in the same engineering discussion.

Set feed-product moisture, composition and storage requirements with the buyer. Close the water and solids balances before quoting dryer capacity. Corn, cassava and molasses residues differ: do not transfer grain protein assumptions or a DDGS route to every feedstock.

Explore the process

Explore the engineering behind the project

Stillage, DDGS & co-productsDesign the residual streams as part of the plant. Separation, evaporation and drying can be as important to the project as alcohol production.Stillage evaporation & DDGS systemsCoordinate solids separation, thin-stillage evaporation, syrup blending and drying around a defined co-product specification. DDGS is a process system, not a general accessory; a molasses stillage route requires a different residue strategy.Wuming Heli · Stillage concentrationA molasses-alcohol wastewater concentration reference.PT Indonesia Ethanol Industry · ENA upgradeCorn-based ENA and medicinal anhydrous alcohol upgrade scope.

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