Bioethanol Production & DDGS

Ethanol is produced by processing grains such as corn, wheat, barley, and rye using dry-milling technology. During this process, the starch in the grains is converted into ethyl alcohol through fermentation, while the remaining nutrient-rich fractions are recovered as DDGS (Distillers Dried Grains with Solubles). Rich in energy, protein, and phosphorus, DDGS is an important by-product for the animal feed industry.

In industrial applications, DDGS is produced through two different methods: dry milling and wet milling.

In the wet-milling process, corn is separated into different fractions and processed into high-value products such as corn oil, starch, gluten, ethanol, and fructose syrup.

In the dry-milling process, ethanol is the main product, while DDGS is recovered as a valuable by-product. At this stage, decanter centrifuges efficiently dewater the material after fermentation, improving both product quality and process efficiency. Where required, the liquid phase can also be utilized in biogas plants to generate additional energy.

This integrated approach delivers maximum efficiency, sustainable production, and high added value for ethanol plants.