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Estimates of Greenhouse Gas Emissions in the Waste Sector of Daejeon Metropolitan City
Korea Ministry of Environment (Korea MOE) enacted the “Greenhouse Gas and Energy Target Management System (GETMS), which requires annual GHG reporting to establish GHG reduction targets for large-scale business places (458) emitting large amount of greenhouse gases (60% of total amount in Korea). The waste sector has higher potential for reduction of greenhouse gases compared to other sectors. Thus, this paper reviewed the methodologies modified based on national guidelines and estimated the greenhouse gas emissions for three categories of the waste sector in Daejeon Metropolitan City (DMC), South Korea. Further analysis for basic unit, i.e., greenhouse gas emissions per ton of solid waste, wastewater, and purified water in the waste sector was conducted to figure out main contributors for GHG emissions. Direct emissions (Scope 1) and indirect emissions (Scope 2) of 11 environmental infrastructures managed by DMC were selected for quantifying and managing of regional GHG emissions. The annual estimation for greenhouse gas emissions in the waste sector in DMC with a population of 1.52 million people was 254,235 tons CO₂ equiv. per year, which includes the main contributor of wastewater treatment 78,063 tons CO2 equiv., waste incineration 76,186 tons CO₂ equiv., and managed waste disposal sites 70,455 tons CO₂ equiv. Basic unit showed that most contributors were waste incineration, followed by the waste disposal site, biological treatment of solid waste, wastewater treatment, and public water supplies. Solid waste treatment/ disposal has best potential role in reducing GHG emissions. In general, therefore, it seems that reduction strategies for the main contributor should be prior to other categories and lead to best practice for managing GHG emissions, especially considering annual budgets.
