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Energy Audit in Wastewater Treatment Plant According to ISO 50001: Opportunities and Challenges for Improving Sustainability

Author

Listed:
  • Francisco Esteves

    (Departamento de Engenharias, Universidade de Trás-os-Montes e Alto Douro, 5000-811 Vila Real, Portugal)

  • José Carlos Cardoso

    (Departamento de Engenharias, Universidade de Trás-os-Montes e Alto Douro, 5000-811 Vila Real, Portugal
    CITAB—Centre for the Research and Technology of Agro-Environmental and Biological Sciences, 5000-801 Vila Real, Portugal)

  • Sérgio Leitão

    (Departamento de Engenharias, Universidade de Trás-os-Montes e Alto Douro, 5000-811 Vila Real, Portugal
    INESC TEC-INESC Technology and Science, 4200-465 Porto, Portugal)

  • Eduardo J. Solteiro Pires

    (Departamento de Engenharias, Universidade de Trás-os-Montes e Alto Douro, 5000-811 Vila Real, Portugal
    INESC TEC-INESC Technology and Science, 4200-465 Porto, Portugal)

Abstract

The efficiency of wastewater treatment systems must be reflected in the removal of the pollutant load from the influent and the optimal energy performance of electrical equipment. Wastewater Treatment Plants (WWTPs) are part of the Intensive Energy Consumption Management System (SGCIE) and are therefore subject to mandatory energy audits. This article aims to assess the impact of an energy audit in a WWTP, according to ISO 50001:2018 and the Plan-Do-Check-Act (PDCA) methodology, to identify and quantify both persistent and transient energy inefficiencies. According to the results, the energy audit contributed to an approximate 10.8% reduction in electrical energy consumption. During the assessment, several challenges were identified that may compromise the effectiveness of audits in improving energy performance. The complexity of the treatment model, aging infrastructure and equipment, the lack of real-time data, and a limited number of indicators hinder the proper management of inefficiency phenomena, particularly transient ones.

Suggested Citation

  • Francisco Esteves & José Carlos Cardoso & Sérgio Leitão & Eduardo J. Solteiro Pires, 2025. "Energy Audit in Wastewater Treatment Plant According to ISO 50001: Opportunities and Challenges for Improving Sustainability," Sustainability, MDPI, vol. 17(5), pages 1-19, March.
    • Handle: RePEc:gam:jsusta:v:17:y:2025:i:5:p:2145-:d:1603585
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    References listed on IDEAS

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    1. Héctor A. Álvarez Macías & Rafael Peña Gallardo & José Ángel Pecina Sánchez & Carlos Soubervielle Montalvo & Aurelio Hernández Rodríguez & Juan Carlos Arellano González, 2025. "Evaluation of the Electricity Consumption Index Based on a Level Two Energy Audit: A Case Study of University Facilities in Mexico," Sustainability, MDPI, vol. 17(13), pages 1-16, June.

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