Eco-efficiency evaluation in wastewater treatment plants considering greenhouse gas emissions through the data envelopment analysis-tolerance model

The eco-efficiency evaluation in wastewater treatment plants (WWTPs) is used to know and improve the environmental economic efficiency of these processes, systems, products, services. evaluations WWTP contemplate inputs be minimized, desirable results maximized, undesired minimized. Data envelopment analysis (DEA) a widely method evaluate WWTPs; integrating several approaches single index, traditional DEA models do not take into account uncertainty data. This study evaluates sample Catalan WWTPs, considering data (DEA tolerance model), it for first time that together with CO2, other greenhouse gas (GHG) such as CH4 N2O are considered part process outputs. GHG emissions were quantified using methods reported literature. Seven hundred twenty-nine scores estimated each instead score like conventional models, analyzing optimistic pessimistic scenarios. WWTPs classified according scores, accounting scenarios, demonstrating changes performance different Only two eco-efficient all scenarios evaluated. approach provides essential information innovation sector.