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Evaluating the Eco-Efficiency of Wastewater Treatment Plants: Comparison of Optimistic and Pessimistic Approaches

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  • Manuel Mocholi-Arce

    (Department of Mathematics for Economics and Business, University of Valencia, 46022 Valencia, Spain)

  • Trinidad Gómez

    (Department of Applied Economics (Mathematics), Campus El Ejido, University of Málaga, 29071 Málaga, Spain)

  • Maria Molinos-Senante

    (Department of Hydraulic and Environmental Engineering, Pontifical Catholic University of Chile, Santiago 4860, Chile
    Center for Sustainable Urban Development ANID/FONDAP/15110020, Santiago 4860, Chile)

  • Ramon Sala-Garrido

    (Department of Mathematics for Economics and Business, University of Valencia, 46022 Valencia, Spain)

  • Rafael Caballero

    (Department of Applied Economics (Mathematics), Campus El Ejido, University of Málaga, 29071 Málaga, Spain)

Abstract

The assessment of wastewater treatment plant (WWTP) performance has gained the interest of water utilities and water regulators. Eco-efficiency has been identified as a powerful indicator, as it integrates economic and environmental variables into a single index. Most previous studies have employed traditional data envelopment analysis (DEA) for the evaluation of WWTP eco-efficiency. However, DEA allows the selection of input and output weights for individual WWTPs for the calculation of eco-efficiency scores. To overcome this limitation, we employed the double-frontier and common set of weights methods to evaluate the eco-efficiency of a sample of 30 WWTPs in Spain. The WWTPs were ranked based on eco-efficiency scores derived under several scenarios including best- and worst-case scenarios; this approach to performance assessment is reliable and robust. Twenty-six of the 30 WWTPs were not classified as eco-efficient, even under the most favorable scenario, indicating that these facilities have substantial room for the reduction of costs and greenhouse gas emissions. The ranking of WWTPs varied according to the scenario used for evaluation, which has notable consequences when eco-efficiency scores are used for regulatory purposes. The findings of this study are relevant for water regulators and water utilities, as they demonstrate the importance of weight allocation for eco-efficiency score estimation.

Suggested Citation

  • Manuel Mocholi-Arce & Trinidad Gómez & Maria Molinos-Senante & Ramon Sala-Garrido & Rafael Caballero, 2020. "Evaluating the Eco-Efficiency of Wastewater Treatment Plants: Comparison of Optimistic and Pessimistic Approaches," Sustainability, MDPI, vol. 12(24), pages 1-13, December.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:24:p:10580-:d:464012
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    Cited by:

    1. Liu, Runxi & Huang, Runyao & Shen, Ziheng & Wang, Hongtao & Xu, Jin, 2021. "Optimizing the recovery pathway of a net-zero energy wastewater treatment model by balancing energy recovery and eco-efficiency," Applied Energy, Elsevier, vol. 298(C).
    2. Sigrid Kusch-Brandt & Mohammad A. T. Alsheyab, 2021. "Wastewater Refinery: Producing Multiple Valuable Outputs from Wastewater," J, MDPI, vol. 4(1), pages 1-11, February.
    3. lo Storto, Corrado, 2024. "Measuring the eco-efficiency of municipal solid waste service: A fuzzy DEA model for handling missing data," Utilities Policy, Elsevier, vol. 86(C).

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