Generation nodes and disposal status of hazardous wastes from metal surface treatment process

It is difficult to manage hazardous wastes in the metal surface treatment industry because of the wide variety of hazardous wastes, the great hazards, the unclear identification of hazardous waste production nodes and the weak awareness of hazardous waste management in the production enterprises. The most used technologies including electroplating, electroless plating, anodic oxidation, phosphating, and passivation processes were selectedand analyzed. By combing the process flow and comparing with National Hazardous Waste List (version 2021), the production nodes, characteristics, and rules of hazardous waste in each process were analyzed. In addition, the generation, disposal process and disposal status of main hazardous wastes were investigated, and reasonable suggestions were put forward for the management and disposal of hazardous wastes in metal surface treatment process in the future. The research results had important reference significance for the realization of source reduction and harmless disposal of hazardous wastes in metal surface treatment industry.