More than 80% of the components of corn are amyloid, which is used in the production of starch. In the process of starch production, a large number of by-products are produced. For example, when wet milling is used to produce corn starch, the first thing to do is to soak corn seeds in water and add certain chemicals, such as sulfite, to soak for 50-60h. Usually 0.8m3 waste water will generated every 1ton corn.
Corn soaked water contains some valuable substances such as corn soluble protein, starch and lipopolysaccharide, and the content is about 5%. Because of the soaking water will have NaSO3 and acid salts, therefore these wastewater treatment is difficult. Multi effect evaporation is a common treatment method for corn soaking water. The corn soaking water is concentrated to 50% concentrated corn pulp through multi effect evaporator, and then used to produce feed and feed yeast.