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Balancing effluent quality, economic cost and greenhouse gas emissions during the evaluation of (plant-wide) control/operational strategies in WWTPs

The objective of this paper was to show the potential additional insight that result from adding greenhouse gas (GHG) emissions to plant performance evaluation criteria, such as effluent quality (EQI) and operational cost (OCI) indices, when evaluating (plant-wide) control/operational strategies in wastewater treatment plants (WWTPs). The proposed GHG evaluation is based on a set of comprehensive dynamic models that estimate the most significant potential on-site and off-site sources of CO2, CH4 and N2O. The study calculates and discusses the changes in EQI, OCI and the emission of GHGs as a consequence of varying the following four process variables: (i) the set point of aeration control in the activated sludge section; (ii) the removal efficiency of total suspended solids (TSS) in the primary clarifier; (iii) the temperature in the anaerobic digester; and (iv) the control of the flow of anaerobic digester supernatants coming from sludge treatment. Based upon the assumptions built into the model structures, simulation results highlight the potential undesirable effects of increased GHG production when carrying out local energy optimization of the aeration system in the activated sludge section and energy recovery from the AD. Although off-site CO2 emissions may decrease, the effect is counterbalanced by increased N2O emissions, especially since N2O has a 300-fold stronger greenhouse effect than CO2. The reported results emphasize the importance and usefulness of using multiple evaluation criteria to compare and evaluate (plant-wide) control strategies in a WWTP for more informed operational decision making

© Science of the Total Environment, 2014, vol. 466-467, p. 616-624

Elsevier

Author: Flores Alsina, Xavier
Arnell, Magnus
Amerlinck, Youri
Vanrolleghem, Peter A.
Corominas Tabares, Lluís
Gernaey, Krist V.
Guo, Lisha
Lindblom, Erik U.
Nopens, Ingmar
Porro, Jose
Shaw, Andrew R.
Snip, Laura J.P.
Vanrolleghem, Peter A.
Jeppsson, Ulf
Date: 2014
Abstract: The objective of this paper was to show the potential additional insight that result from adding greenhouse gas (GHG) emissions to plant performance evaluation criteria, such as effluent quality (EQI) and operational cost (OCI) indices, when evaluating (plant-wide) control/operational strategies in wastewater treatment plants (WWTPs). The proposed GHG evaluation is based on a set of comprehensive dynamic models that estimate the most significant potential on-site and off-site sources of CO2, CH4 and N2O. The study calculates and discusses the changes in EQI, OCI and the emission of GHGs as a consequence of varying the following four process variables: (i) the set point of aeration control in the activated sludge section; (ii) the removal efficiency of total suspended solids (TSS) in the primary clarifier; (iii) the temperature in the anaerobic digester; and (iv) the control of the flow of anaerobic digester supernatants coming from sludge treatment. Based upon the assumptions built into the model structures, simulation results highlight the potential undesirable effects of increased GHG production when carrying out local energy optimization of the aeration system in the activated sludge section and energy recovery from the AD. Although off-site CO2 emissions may decrease, the effect is counterbalanced by increased N2O emissions, especially since N2O has a 300-fold stronger greenhouse effect than CO2. The reported results emphasize the importance and usefulness of using multiple evaluation criteria to compare and evaluate (plant-wide) control strategies in a WWTP for more informed operational decision making
Format: application/pdf
ISSN: 0048-9697
Document access: http://hdl.handle.net/10256/10323
Language: eng
Publisher: Elsevier
Collection: Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.scitotenv.2013.07.046
Articles publicats (ICRA)
info:eu-repo/grantAgreement/EC/FP7/289193
info:eu-repo/grantAgreement/EC/FP7/293535
Is part of: © Science of the Total Environment, 2014, vol. 466-467, p. 616-624
Rights: Tots els drets reservats
Subject: Referenciació (Economia)
Benchmarking (Management)
Escalfament global
Global warming
Control de processos
Process control
Desenvolupament sostenible
Sustainable development
Title: Balancing effluent quality, economic cost and greenhouse gas emissions during the evaluation of (plant-wide) control/operational strategies in WWTPs
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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