Browsing by Author "Gomez, Trinidad"

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Assessing changes in eco-productivity of wastewater treatment plants: The role of costs, pollutant removal efficiency, and greenhouse gas emissions
    (2018) Gemar, German; Gomez, Trinidad; Molinos Senante, María; Caballero, Rafael; Sala-Garrido, Ramon; CEDEUS (Chile)
  • No Thumbnail Available
    Item
    Eco-efficiency assessment of municipal solid waste services: Influence of exogenous variables
    (2021) Delgado-Antequera, Laura; Gemar, German; Molinos-Senante, Maria; Gomez, Trinidad; Caballero, Rafael; Sala-Garrido, Ramon
    Improving the eco-efficiency of municipalities in the provision of municipal solid waste (MSW) services is fundamental in the context of a circular economy. This study evaluates the eco-efficiency of a sample of Spanish municipalities, integrating the total cost as input, recyclable waste as desirable output, and unsorted waste as undesirable output. Following a pioneering approach, the weighted Russell directional distance model (a non-radial data envelopment analysis model) was employed, which allowed us to obtain a global inefficiency score and individual inefficiency scores for each variable integrated in the model. In the second stage of analysis, the potential factors affecting the previously computed ineffi-ciency scores were investigated. The results indicated that one third of the municipalities evaluated were eco-efficient in the provision of MSW services with the total cost being the variable in which the munic-ipalities exhibited the best performance. Moreover, the size of the municipalities, population served, pop-ulation density, tourism, and availability of containers for separative collection of paper, glass, and plastic significantly affect the eco-efficiency of the municipalities. The findings of this study provide detailed information to support decision-making for the policy makers to improve the eco-efficiency of the munic-ipalities in managing MSW. (c) 2021 Elsevier Ltd. All rights reserved.
  • No Thumbnail Available
    Item
    Measuring the quality of service of water companies: A two-stage goal programming synthetic index proposal
    (2022) Molinos-Senante, Maria; Delgado-Antequera, Laura; Gomez, Trinidad
    Quality of service (QS) is one of the most important parameters for evaluating the performance of water companies. It is a multidimensional concept that encompasses several performance indicators, with synthetic indicators that provide useful evaluation tools. Drinking water provision and wastewater treatment are basic services for which there is a series of minimum requirements that all water companies must meet. Under this premise, this study proposes a novel synthetic indicator to evaluate the QS of water companies in two stages. First, the non-compliance index was estimated, which provides information on the degree of non-compliance for essential indicators. Second, based on the goal programming approach, each water company's strengths and weaknesses were computed to generate a QS index with rankings. The index was then tested empirically on a sample of 24 water companies in Chile based on 10 initial indicators (of which three are considered essential indicators). Overall, 37.5% of the water companies did not meet the thresholds delineated for the essential indicators. Moreover, only five water companies had a positive QS index (i.e., their strengths were greater than their weaknesses). A scenario analysis evaluated the impact of weight allocation on the QS of water companies and their ranking. The ranking of water companies varied depending on the weights allocated to the initial indicators, demonstrating the importance of delineating regulator preferences when assessing QS.