Effects of Physical and Chemical Properties of Existing Waste and Different Disposal Methods on Carbon Emission
Four landfill sites in Yangtze River Delta(Dongtai city,Ma'anshan city,Nanjing city,Yangzhou city)were selected as research objects,the physicochemical properties of the existing waste were investigated.On this basis,the carbon emission factor method was used to evaluate the carbon emissions of landfill under three modes of sanitary landfill(current status),in-situ closure and excavation-screening resource utilization.The relationship between the main influencing factors and carbon emission was analyzed.The results showed that the total amount of waste and its components directly affect the carbon emission of landfill.Under the current status,if the landfill gas was directly emptied,the carbon emission(measured in CO2)per unit mass of waste was 1.466 t/t.Under if the current status,the landfill gas was burned,the carbon emission(measured in CO2)per unit mass of waste was 0.516 t/t.Landfill gas was collected and purified for power generation,making landfills"carbon neutral".In the in-situ closure mode,when landfill gas was burned,the carbon emission(measured in CO2)per unit mass of waste was 0.470-0.505 t/t.Landfill carbon emissions could be reduced if landfill gas was used for power generation.Compared with energy recovery,material reuse was more beneficial to carbon reduction in landfill under waste excavation-screening resource mode.The choice of different modes depends on the content of recyclables and light combustibles in the waste composition.The results could provide data basis for the assessment of landfill carbon emissions and landfill management.
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