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Quantitative assessment of energy and resource recovery in wastewater treatment plants based on plant-wide simulations

The growing development of technologies and processes for resource treatment and recovery is offering endless possibilities for creating new plant-wide configurations or modifying existing ones. However, the configurations’ complexity, the interrelation between technologies and the influent characteristics turn decision-making into a complex or unobvious process. In this frame, the Plant-Wide Modelling (PWM) library presented in this paper allows a thorough, comprehensive and refined analysis of different plant configurations that are basic aspects in decision-making from an energy and resource recovery perspective. In order to demonstrate the potential of the library and the need to run simulation analyses, this paper carries out a comparative analysis of WWTPs, from a techno-economic point of view. The selected layouts were (1) a conventional WWTP based on a modified version of the Benchmark Simulation Model No. 2, (2) an upgraded or retrofitted WWTP, and (3) a new Wastewater Resource Recovery Facilities (WRRF) concept denominated as C/N/P decoupling WWTP. The study was based on a preliminary analysis of the organic matter and nutrient energy use and recovery options, a comprehensive mass and energy flux distribution analysis in each configuration in order to compare and identify areas for improvement, and a cost analysis of each plant for different influent COD/TN/TP ratios. Analysing the plants from a standpoint of resources and energy utilization, a low utilization of the energy content of the components could be observed in all configurations. In the conventional plant, the COD used to produce biogas was around 29%, the upgraded plant was around 36%, and 34% in the C/N/P decoupling WWTP. With regard to the self-sufficiency of plants, achieving self-sufficiency was not possible in the conventional plant, in the upgraded plant it depended on the influent C/N ratio, and in the C/N/P decoupling WWTP layout self-sufficiency was feasible for almost all influents, especially at high COD concentrations. The plant layouts proposed in this paper are just a sample of the possibilities offered by current technologies. Even so, the library presented here is generic and can be used to construct any other plant layout, provided that a model is available

The authors would like to acknowledge COST Action ES1202: Conceiving Wastewater Treatment in 2020 e “Water2020” and RedNovedar (CTQ2016-81979-REDC). The authors wish to thank Dr. Miquel Rigola from the Laboratory of Chemical and Environmental Engineering (LEQUIA) for his help and suggestions. S. Puig and M. Poch would like to thank the Spanish Ministry (CTQ2014-53718-R) and the University of Girona (MPCUdG2016/137) for their financial support. LEQUIA has been recognised as a consolidated research group by the Catalan Government (2014-SGR-1168)

© Water Research, 2017, vol. 118, p. 272-288

Elsevier

Author: Fernández-Arévalo, T.
Lizarralde, I.
Fdz-Polanco, F.
Pérez-Elvira, S. I.
Garrido, J. M.
Puig Broch, Sebastià
Poch, Manuel
Grau, P.
Ayesa, E.
Date: 2017 July 1
Abstract: The growing development of technologies and processes for resource treatment and recovery is offering endless possibilities for creating new plant-wide configurations or modifying existing ones. However, the configurations’ complexity, the interrelation between technologies and the influent characteristics turn decision-making into a complex or unobvious process. In this frame, the Plant-Wide Modelling (PWM) library presented in this paper allows a thorough, comprehensive and refined analysis of different plant configurations that are basic aspects in decision-making from an energy and resource recovery perspective. In order to demonstrate the potential of the library and the need to run simulation analyses, this paper carries out a comparative analysis of WWTPs, from a techno-economic point of view. The selected layouts were (1) a conventional WWTP based on a modified version of the Benchmark Simulation Model No. 2, (2) an upgraded or retrofitted WWTP, and (3) a new Wastewater Resource Recovery Facilities (WRRF) concept denominated as C/N/P decoupling WWTP. The study was based on a preliminary analysis of the organic matter and nutrient energy use and recovery options, a comprehensive mass and energy flux distribution analysis in each configuration in order to compare and identify areas for improvement, and a cost analysis of each plant for different influent COD/TN/TP ratios. Analysing the plants from a standpoint of resources and energy utilization, a low utilization of the energy content of the components could be observed in all configurations. In the conventional plant, the COD used to produce biogas was around 29%, the upgraded plant was around 36%, and 34% in the C/N/P decoupling WWTP. With regard to the self-sufficiency of plants, achieving self-sufficiency was not possible in the conventional plant, in the upgraded plant it depended on the influent C/N ratio, and in the C/N/P decoupling WWTP layout self-sufficiency was feasible for almost all influents, especially at high COD concentrations. The plant layouts proposed in this paper are just a sample of the possibilities offered by current technologies. Even so, the library presented here is generic and can be used to construct any other plant layout, provided that a model is available
The authors would like to acknowledge COST Action ES1202: Conceiving Wastewater Treatment in 2020 e “Water2020” and RedNovedar (CTQ2016-81979-REDC). The authors wish to thank Dr. Miquel Rigola from the Laboratory of Chemical and Environmental Engineering (LEQUIA) for his help and suggestions. S. Puig and M. Poch would like to thank the Spanish Ministry (CTQ2014-53718-R) and the University of Girona (MPCUdG2016/137) for their financial support. LEQUIA has been recognised as a consolidated research group by the Catalan Government (2014-SGR-1168)
Format: application/pdf
Citation: https://doi.org/10.1016/j.watres.2017.04.001
ISSN: 0043-1354 (versió paper)
1879-2448 (versió electrònica)
Document access: http://hdl.handle.net/10256/14336
Language: spa
Publisher: Elsevier
Collection: MINECO/PE 2015-2017/CTQ2014-53718-R
Reproducció digital del document publicat a: https://doi.org/10.1016/j.watres.2017.04.001
Articles publicats (D-EQATA)
Is part of: © Water Research, 2017, vol. 118, p. 272-288
Rights: Tots els drets reservats
Subject: Aigües residuals -- Depuració
Sewage -- Purification
Title: Quantitative assessment of energy and resource recovery in wastewater treatment plants based on plant-wide simulations
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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