Municipal solid waste management with cost minimization and emission control objectives

Mohsenizadehkamou, Melika
Proper management of municipal solid waste (MSW) has been a crucial aspect of every society due to its social, environmental, and economic impacts. Operations research techniques have frequently focused on cost minimization objectives in locational planning of municipal solid waste management (MSWM) systems. However, transportation constitutes an integral part of this system producing a considerable amount of greenhouse gas (GHG) emissions. Therefore, sustainable management of MSW systems with GHG emissions minimization considerations is necessary to preserve the resources and protect the environment. In this thesis, we investigate the interplay between system cost and carbon dioxide (CO2) emissions resulting from transportation activities in locational planning of MSWM system by minimizing them in a bi-objective mixed integer linear programming model. The amount of emitted CO2 is assumed to be proportional to fuel consumption of vehicles which is calculated by a microscopic model incorporating various factors such as vehicle speed, load, and technical characteristics. The proposed model is applied to MSWM system of Ankara to introduce transfer stations (TSs). Two extensions of the current system are examined, namely, the extended and hybrid systems, where MSW is only transported through TSs in the former, while direct shipments are also allowed in the latter. For both extensions, it is observed that with no or little increase in system cost, considerable savings in CO2 emissions can be achieved. Moreover, simulation analyses are performed to investigate the impact of speed variations on resulting CO2 emissions and system cost.