(Invited) Evaluating Urban Water-Energy Systems Based on UN Sustainable Development Goals (SDGs)

Abstract

Evaluating Urban Water-Energy Systems Based on UN Sustainable Development Goals (SDGs) Water, food, and energy are three of the major resource issues facing the world today. To help address these issues, urban wastewater is now being considered as a renewable resource than as a waste- a resource for water, for energy, and fertilizers. It is now well recognized that the traditional urban wastewater infrastructure needs to be re-engineered for improved environmental, social, and economic sustainability by minimizing the energy input for treating the wastewaters and by recovering water, energy, and fertilizers from the wastewater for beneficial reuse. In recent years, several alternate technologies have been proposed to take advantage of the water-energy nexus in urban wastewater infrastructure systems. This paper presents a case study evaluating sustainability of four urban water-energy nexus based on the 17 United Nations Sustainable Development Goals (SDGs) that have been unanimously endorsed by all 193 member countries. A multi-criteria decision making (MCDM) approach is used in this study to evaluate the four alternate urban water-energy systems in terms of 30 criteria spanning environmental, social, and economic sustainability. The 30 criteria selected here were derived from the 17 SDGs. The MCDM approach was selected in this study because of its ability to handle quantitative and qualitative criteria and rank the options on a numerical scale. The four wastewater treatment alternatives were evaluated under 12 different scenarios considering high/low priorities of decision-makers towards six different water-energy nexus attributes (pathogen removal, energy consumption, gaseous emission, resource recovery, footprint, and past records).