With the acceleration of urbanization, small and medium-sized cities produce about 200 to 300 tons of household waste every day. The treatment of urban household waste has become the problem demanding prompt solution for local governments. The problem that the solid waste treatment facilities do not match the production volume and the existing disposal capacity is difficult to meet the actual needs is the main situation facing the prevention and control of solid waste pollution. In particular, the amount of industrial solid waste generated continues to increase, and the solid waste management capacity is very weak, so solid waste pollution prevention and control work faces serious situation.
In recent years, the use of cement kilns for the safe disposal of household waste systems has become a new choice for waste treatment. The cement kiln of the cement plant can be used to burn the garbage fully, and the generated gas can be decomposed and dedusted by the decomposition furnace; the waste residue and fly ash can be used as fuel and raw materials for cement production. Moreover, the garbage can be directly put into the system without sorting before processing, which can save a lot of time and manpower and improve the efficiency of garbage disposal.
At present, the co-processing of cement kiln has been supported and encouraged by governments. Therefore, the proportion of co-processing in solid waste treatment has become higher and higher in the past two years. In the current total capacity of incineration hazardous waste disposal, cement kiln co-disposal has accounted for 45%, and traditional incineration process accounted for 55%. The two scales are relatively close. In 2017 and 2018, 19 and 26 new cement kiln co-processing hazardous waste projects were added. Compared with 2014 to 2016, the co-processing hazardous waste capacity has grown rapidly in the past two years.
The rapid development of co-processing of cement kiln is benefit from two aspects. Firstly, with the relative technical system becoming more and more complete, it has become a new force for environmental governance. Cement companies with aspirations for transformation and development have chosen collaborative treatment as a breakthrough to enable rapid development. Secondly, with the continuous increase of national environmental governance, especially the rapid increase in demand for solid waste and hazardous waste disposal facilities, the technology of co-disposal with relatively short period and large disposal capacity is welcomed.