Abstract: The COVID-19 epidemic has led to a surge of the amount of medical waste， and the generation amount of medical waste in severely affected areas far exceeded their existing disposal capacity. Disposal of medical waste become a key link to prevent epidemic spreading. The characteristics， environmental risks and technical adaptability of two medical waste emergency co-disposal technologies including co-incineration with hazardous waste and domestic waste respectively were compared. The environmental impacts and key factors of the two technologies were evaluated and compared via life cycle assessment. The results showed that co-incineration with domestic waste has significant environmental benefits due to power generation. While co-incineration with hazardous waste could effectively avoid the secondary synthesis of dioxins， but had a great impact on the environment due to high energy consumption. Scenario analysis of co-incineration with hazardous waste showed that the energy recovery efficiency increased by 63.6%， energy conservation and emission reduction targets reduced by 21.9%. The results of the study could provide recommendations for the emergency management and sustainable development of medical waste.

Key words: medical waste, life cycle assessment, emergency disposal techniques, co-incineration, energy recovery analysis