Hybrid Inexact Optimization Approach with Data Envelopment Analysis for Environment Management and Planning in the City of Beijing, China

In this study, a two-stage interval-stochastic mixed integer programming method was developed for supporting long-term planning of solid waste management in the city of Beijing, China. The developed method reflects uncertainties expressed as probability density functions and intervals, as well as offers a linkage between predefined environmental policies and associated economic implication. The method has advantages in tackling dynamic, interactive, and uncertain characteristics of solid waste management system in the city, and addressing issues regarding waste diversion and landfill prolongation. Reasonable solutions were generated for waste flow allocation and system capacity expansion. Data envelopment analysis was then utilized for analyzing these solutions under different policy scenarios. Obtained results can provide useful information and decision-support for the city's solid waste management planning. Results are valuable for adjustment of the existing waste management practice and identification of desired waste flow allocation patterns for the city of Beijing. Results also suggest that the developed method is applicable to other engineering decision-making problems.