The sewage from bean products of the sewage treatment equipment of bean products factory mainly comes from soaking bean water, cooking soybean milk water, cleaning water, etc. In addition, the production process of bean products belongs to the intermittent production mode, the drainage time is relatively concentrated, and the water quantity and quality are uneven; Under anaerobic conditions, it is easy to produce scum layer on the surface of sewage; Sewage pollutants from bean products