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Sustainable solid waste management system using multi-objective decision-making model: a method for maximizing social
Giang Minh Hoang1, Takeshi Fujiwara2, Toan Song Pham Phu2,3
1Department of Environmental Technology and Management, Faculty of Environmental Engineering, National University of Civil Engineering, 55 Giai Phong road, Hanoi, 113021, Vietnam. gianghm@nuce.edu.vn.
Abstract:
The main aim of this study was to develop a decision support system for sustainable municipal solid waste management (MSWM) in Hoi An city (HAC), Vietnam. A face-to-face interview was conducted with local experts including authorities, citizens, waste collection contractors and recyclers to identify main objectives of waste management system and appropriate treatment methods. A multi-objective optimization model was proposed using non-linear programming approach. An interactive method known as reference point method (RPM) was applied for solving the problem with three objectives including cost minimization, landfill minimization and emission minimization. As a result, the efficient waste-flow-allocation and the optimal capacity of disposal facilities were determined by intense discussion and agreement among decision-makers. Waste incineration, anaerobic digestion, sanitary landfill and current recycling activities should be applied with a cost of about 2300 US$ daily. Also, the daily emission of various pollutants was about 35 metric tons, and the greenhouse gas (GHG) is 313 tons CO2-eq.
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