Dry and Wet Milling

Two different approaches in grain processing

As only the starch is needed as a carbohydrate source for the biological conversion process, the remaining ingredients of a raw material such as proteins, minerals, fat and fiber, in turn can provide valuable products. 

In the grain processing industry, there are two systemic approaches with different objectives: dry milling plants and wet milling plants.

Dry milling plants

are typical for the production of ethanol from grain. The grain kernel is used as a whole and milled for preparation. The starch contained in the flour is converted to alcohol, the remainder is used to make animal feed (called DDGS).

The initial investment is moderate due to the elementary setup of the process.

Wet milling plants

or grain processing plants - separate the grain kernel into its components to extract additional value. In a refining process the fibers (bran), germs, oil and gluten are separated as profitable by-products before the remaining starch (milk) is upgraded to starch specialties, or further processed.

Depending on the range of process lines involved, a higher level of investment is needed.

1 grainprocessing
Design of grain processing facilities

Grain refining includes the production of a whole range of valuable products and by-products such as

  • Dry native starch
  • Dry protein fraction (gluten)
  • Germ fraction
  • Dried and pelletized animal fodder
  • Modified starch and other upgraded starch products
  • Starch sweeteners
  • Fermentation products

We understand the interaction among substrate, bioconversion, recovery and purification and can assist you in developing your complete grain processing project, from raw material selection through to the final product range. Contact us for:

  • Pre-engineering and feasibility studies including comparison of different product scenarios
  • Determination of the most suitable technical solutions and equipment for drying, filtration, evaporation, ...
  • System integration of all involved technologies (dry milling, wet milling, starch processing, product drying, ...)