This paper presents an application of the Analytical Hierarchy Process (AHP) by integrating a Delphi process for selecting the best sustainable disinfection technique for wastewater reuse projects. The proposed methodology provides project managers a tool to evaluate problems with multiple criteria and multiple alternatives which involve non-commeasurable decision criteria, with expert opinions playing a major role in the selection of these treatment technologies. Five disinfection techniques for wastewater reuse have been evaluated for each of the nine criteria weighted according to the opinions of consulted experts. Finally, the VIKOR method has been applied to determine a compromise solution, and to establish the stability of the results. Therefore, the expert system proposed to select the optimal disinfection alternative is a hybrid method combining the AHP with the Delphi method and the VIKOR technique, which is shown to be appropriate in realistic scenarios where multiple stakeholders are involved in the selection of a sustainable disinfection technique for wastewater reuse projects.

ElsevierCuriel Esparza, J.; Mazario-Diez, JL.; Canto-Perello, J.; Martín Utrillas, MG. (2016). Prioritization by consensus of enhancements for sustainable mobility in urban areas. Environmental Science and Policy. 55 (1) ABSTRACTNowadays the European cities usually present important problems at economic, social and environmental levels. The European Union has published policies to ease this issue, and several European cities are creating sustainable mobility urban plans with the measures which can be taken to improve the mobility system. Transport decisions have direct impact on transit times, urban connectivity, and have also effects in the environment, public health and society. Choosing the best enhancement to implement is a complex decision, depending on tangible and intangible criteria, which have to be taken into account together. A compromise solution that weighs travel quality, cost and sustainability inputs has to be achieved. This research work presents a decision support system to select the optimal sustainability enhancement integrating the Delphi technique with the Analytic Hierarchy Process and the VIKOR method. GRAPHICAL ABSTRACT HIGHLIGHTSSelect optimal strategies in achieving sustainable mobility.Analytic Hierarchy Process combined with a Delphi technique and the VIKOR method.Framework to achieve consensus decision-making in urban mobility.Applying tangible and intangible criteria in sustainable urban transport.

Martín Utrillas, MG.; Reyes Medina, M.; Curiel Esparza, J.; Cantó Perelló, J. (2015). Hybrid method for selection of the optimal process of leachate treatment in waste treatment and valorization plants or landfills. Clean Technologies and Environmental Policy. 17(4):873-885. doi:10.1007/s10098-014-0834-4. 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 ABSTRACT Leachate from landfill waste plants is a very complex and highly contaminated liquid. In its composition we find dissolved organic matter, inorganic salts, heavy metals and other xenobiotic organic compounds, so it can be toxic, carcinogenic and capable of inducing a potential risk to biota and humans. European law does not allow such leachate to leave the premises without being depurated. There are many procedures that enable debugging, always combining different techniques. Choosing the best method to use in each case is a complex decision, as it depends on many tangible and intangible factors that must be weighed to achieve a balance between technical, cost, and environmental sustainability. We present a hybrid method for choosing the optimal combination of techniques to apply in each case, by combining a multi-criteria hierarchical analysis based on expert data obtained by the Delphi method with an analysis by the method of VIKOR to reach a consensus solution.Manuscript Click here to download Manuscript: Manuscript.docx 1 2 3 4 5 6 7 8

Technological advances have allowed the development of new roof assembly typologies with higher efficiency and less waste. However, in the construction sector the focus is generally on reducing cost and not in sustainable development factors. Short-sighted building planning based only on economic criteria should be avoided improving decision support systems. In addition, the selection of an appropriate roof assembly in a building's design stage is a complex problem due to the existence of different tangible and intangible factors and the multiple alternatives available. The roof typologies under study involve prefabricated concrete, steel and laminated wood structures. This research work applies a multi-criteria hybrid model combining the Analytical Hierarchy Process with the Delphi method and the VIKOR technique for implementing sustainability criteria in the selection of a roof assembly in medium span buildings. The proposed decision support system enables the use of the triple bottom line that considers economic, social and environmental criteria. Under the criteria analyzed, the compromise solution found is the self-supporting curved system.

The role of infrastructures in boosting the economic growth of the regions is widely recognized. In many cases, an infrastructure is selected by subjective reasons. Selection of the optimal infrastructure for sustainable economic development of a region should be based on objective and founded reasons, not only economical, but also environmental and social. In this paper is developed such selection through a hybrid method based on Delphi, analytical hierarchy process (AHP), and VIKOR (from Serbian, VIseKriterijumska Optimizacija I Kompromisno Resenje). To do this, a panel of experts assesses both the infrastructures and the drivers for their selection. The method lets us to verify the consistency of answers from experts. In our case, AHP obtains preference values for each infrastructure using the eigenvector method. Meanwhile, the VIKOR method evaluates whether the proposed is the one that best fits the prevailing view, minimizing the regret to the most separate opinions. Thus, for La Costera (Spain), the region under study, this research work concludes that the thematic route is the optimal infrastructure.