Municipal solid waste (MSW) co-processing in cement kiln to relieve China's Msw treatment capacity pressure

Abstract In many countries, like China, the huge capacity of cement industry seems to be able to absorb the booming production of municipal solid waste (MSW). However, the rapid progress of incineration facilities construction raise questions such as will there be chances of cement kiln co-processing (CKC) to be utilized and promoted as an MSW complementary technology in China, and how will it develop in the future? This paper obtained numerous up-to-date data and information as support evidences to quantitatively evaluate the MSW treatment pressure and its temporal and spatial evolution in Chinese provinces, and estimate the CKC promotion and emission reduction potential for adapting to regional MSW demand. Results showed that CKC still has a great promotion potential. China's MSW treatment system was under long-term pressure and might have a shortage of 4.50 million tons in 2020. Provincial level analysis indicated that CKC could not only completely filled the treatment gap, but also replaced 78.05 million tons of landfill capacity. The resulting environmental benefits were significant, with a reduction of 2.55E+10 kg CO2 eq. and 4.47E+07 kg SO2 eq. from a life-cycle perspective for GWP and AP etc., respectively. Hence, CKC contributed to relieving the pressure on MSW management (MSWM) and improving environmental performance. By developing more precise regional planning, some of the issues that had hindered the spread of CKC could be addressed. The main findings of this paper might be influential in guiding the universalization of CKC in China and other regions.