Environmental Analysis for Co-Processing of Municipal Solid Waste Incineration Fly Ash in Cement Kiln

Municipal solid waste incineration fly ash (MSWIFA) is a kind of hazardous waste. In the recent years, the demand for the disposal of MSWIFA has gradually increased with the increase of its production. The co-processing of MSWIFA in cement kiln has become the future development trend in this field due to the advantages of large disposal capacity, thorough disposal and low secondary pollution. In this paper, the life cycle assessment (LCA) was used to analyze the environmental impact of cement kiln co-processing MSWIFA, and the influence of allocation method of by-products in pretreatment process on calculation results was discussed. The results of analysis on the pretreatment of MSWIFA using the water-washing process showed that the allocation method of by-products will affect the calculation results to a certain extent, especially in the toxicity-related indicators, and for pretreatment process, electricity production process is the key link to causing environmental impact. The environmental analysis for clinker product shows that the contribution ratio of pretreatment process calculated by extended boundary method was 3.33% larger than that of mass allocation method in acidification potential(AP), and 3.32% smaller than that in WCP.