Abstract: Thermal desorption method has been widely used in the field of oil sludge disposal, but the hazardous characteristics of the residue after treatment are still unclear, which restricts the development of its resource utilization methods. Taking the thermal desorption residue of oil sludge produced by sewage treatment of a petrochemical company in Xinjiang as the research object, a total of 117 substances including inorganic elements, semi-volatile and volatile organic compounds, and organic compounds were measured. The hazardous characteristics and resource utilization environmental risks of petrochemical sludge thermal desorption residues were systematically analyzed by comparing soil-related pollution control standards. The results showed that the corrosiveness, flammability, reactivity and toxic substances of the petrochemical sludge thermal desorption residue did not exceed the limits of the series of standards for hazardous waste identification (GB5085—2007), so it was not dangerous waste characteristics. The potential pollution risks of copper, antimony, nickel, cyanide, cadmium, benzene, petroleum hydrocarbons and N-nitrosodi-n-propylamine to agricultural soil should be prevented during the recycling of the residue. The results can be used as reference for resource recycling route selection and pollution prevention and control of thermal desorption residues from petrochemical sludge.

Key words: petrochemical sludge, thermal desorption, residues, resource utilization, hazardous characteristics