The raw materials for the production of starch are mainly wheat, corn, and potato. In the process of producing starch, a large amount of waste water is generated. The wastewater has a high acid concentration and contains a large amount of organic matter. Mainly soluble starch and protein, COD is relatively high, generally 2000-30000mg / L, SS is 1800mg / L, no toxicity. If the wastewater is directly discharged into the water body, it will not only cause serious pollution of the water body, but also waste resources. The recovered starch and protein can be processed into feed to produce economic benefits. The most common method at home and abroad is the treatment of flocculation and sedimentation.

The flocculation sedimentation method is to add an organic polymer flocculant or an inorganic flocculant to the waste water, and utilize the water purification principle of the flocculant to leave the starch and water in the waste water. Achieve the purpose of treating wastewater. The performance of the flocculant largely determines the quality of the water treatment. The most used and the best effect is to treat the wastewater with the organic polymer flocculant PAM. Using the cationic PAM-treated starch wastewater produced by Liaocheng Huarun Chemical Co., Ltd., the COD removal rate is over 90%, the SS removal rate is above 75%, the biochemical treatment after flocculation reaches the standard discharge, and the dosage of the agent is small and the cost is low. It is the most ideal for high concentration organic wastewater treatment. The flocculated sediment is easy to dehydrate and is easy to recycle and process into feed.