2. Methods for quantifying CO2 emission MPI-0479605 from industrial symbiosis in ISMs
2.1. System boundary and methods for CO2 emission calculation in ISMs
Guidelines have been provided for the system boundary and method selection by some international organizations, including the Intergovernmental Panel on Climate Change (IPCC) (Eggleston et al., 2007), World Steel Association (WSA) (IISI, 2004 and WSA, 2009), World Resources Institute (WRI), and World Business Council for Sustainable Development (WBCSD) (WRI and WBCSD, 2008), as demonstrated in Table 1.
About 90% of the steel in China was produced by blast furnace - basic oxygen furnace (abbreviated as BF-BOF) route ISMs in 2012 (WSA, 2013). The calculation results of CO2 emissions in iron and steel industry are sepals influenced by the selection of system boundary and calculation methods, as demonstrated in Table 2.
We recommended the system boundary setting described in Fig. 1, which was adapted from the widely used guideline made by WSA and representative studies done in the Chinese context (Hasanbeigi et?al., 2014, Shangguan et?al., 2010a, Shangguan et?al., 2010b and WSA, 2009). It excluded the upstream processes of transportation, mining and dressing-washing of coal and iron ore.