Comprehensive efficiency evaluation of coal enterprises from production and pollution treatment process

Environmental problems caused by coal enterprises have drawn increasing attentions. In order to address this problem, in this paper, the production chain of coal enterprises is divided into production process and pollution treatment process, and accordingly a scientific input-output index system is built as well. In addition, by using the non-radial, non-angular slacks-based measurement (SBM) model, a comprehensive assessment for the operational efficiency of 36 Chinese coal enterprises based on the data from 2006 to 2011 is presented. The production efficiency and environmental efficiency of each enterprise are measured, and the input redundancy and output deficiency of these enterprises are analyzed as well. This helps to provide scientific analysis for enterprises to make their decisions in resource utilization and environmental protection.