There are two control paths: one is vitrification by high-temperature melting, which aims to control the release of toxic and harmful substances into the environment; The second is landfill. For municipal sewage treatment plant sludge, according to the standard of Mud for Mixed Landfill of Sludge Disposal in Urban Sewage Treatment Plants; If the sewage sludge belongs to hazardous waste, it shall be landfilled according to the Pollution Control Standard for Hazardous Waste Landfill.
The sludge determination rule after hazardous waste treatment is that the treated hazardous waste with one or more hazardous characteristics such as toxicity (including leaching toxicity, acute toxicity and other toxicity) and infectivity still belongs to hazardous waste, unless otherwise stipulated by relevant national laws and standards. At present, after the treatment of hazardous wastes, there are the following three categories: first, the Code for Centralized Disposal of Medical Wastes, in which the slag generated by incineration can be sent to the domestic garbage landfill for disposal, unless it is found to be hazardous waste after testing; Second, the "Technical Treatment Specification for Chromium Slag Pollution Control", if the leaching concentration of chromium and barium is less than a certain value, it can be landfilled in domestic garbage landfill or general industrial solid waste landfill; The third is "Reply on Issues Related to Disposal of Fly Ash from Municipal Solid Waste Incineration". After coupling solidification and stabilization, the water content, dioxin content and pollutant concentration of leachate of fly ash are less than a certain value, which can be landfilled in separate zones in the domestic waste landfill.