Abstract:

A certain food waste treatment plant in the eastern part of Beijing is located in Tongzhou District, Beijing, and went into operation in 2007. After the comprehensive implementation of waste classification in Beijing, the characteristics of food waste have changed significantly, resulting in the unstable operation of the plant. In 2023, the plant changed the pretreatment system from the mechanical crushing + mechanical pressing pulping process to the hydropulping pretreatment, and changed the dry anaerobic process to the wet anaerobic process. Moreover, the equipment of the deodorization system was replaced. After the renovation, the system has adapted to the new characteristics of the waste and achieved stable operation. The slag discharge rate of the pretreatment system is approximately 20%, and the water content of the discharged slag is about 70%; the gas production rate of the anaerobic system reaches 65 Nm3/t, and the methane concentration in the biogas is approximately 57%; the designed air volume of the deodorization system has been reduced by 50%, and the concentration of organized odor emissions is lower than 1000 (dimensionless). Through the engineering example of the renovation of this treatment plant, this article summarizes the relevant experience, providing experience for the construction or renovation of similar projects.

Key words: Food Waste')">

Food Waste, Waste Separation, Hydropulping Pretreatment, Wet Anaerobic Digestion