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LIFE CYCLE ASSESSMENT (LCA) OF MUNICIPAL SOLID WASTE MANAGEMENT SYSTEM IN KATHMANDU METROPOLITAN CITY
Om Bam Malla

Last modified: 2017-09-12

Abstract


The study was focused on the life cycle assessment of the municipal solid waste management of Kathmandu Metropolitan City (KMC). One ton of waste was taken as a functional unit to compare different scenarios. Scenario 1: business as usual includes collection, transport and landfilling, Scenario 2: energy recovery with recycling and Scenario 3: conjunctive disposal system comprising of composting and landfilling. The life cycle inventory was developed that includes detail unit process and has quantified values of various resources and emissions to environment were calculated as Global Warming Potential (GWP), Acidification Potential (AP), Eutrophication Potential (EP) and Fuel Energy Consumption (FEC). GWP, AP, EP and FEC were calculated for the each scenario and compared in kg equivalents per tons of waste managed in landfill. The GWP for scenario 1 was approximately 3 times more than GWP for scenario 3, while the AP, EP and the FEC was almost same as GWP. In accordance with the results, scenario 3 was found to be the option with minimum environmental impacts (less GWP, AP, EP) and cheap in case of fuel consumption cost. The result is influenced more due to higher composition of organic waste that can be composted and the GWP can be controlled by it. The final results obtain from this study can be applied for the integrated solid waste management system as an environmental tool.

Keywords: Acidification, Eutrophication, Global Warming Potential, Life Cycle Inventory (LCI)

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