The main objective of this paper is to demonstrate the importance of applying dynamic modelling and real energy prices on a full scale water resource recovery facility (WRRF) for the evaluation of control strategies in terms of energy costs with aeration. The Activated Sludge Model No. 1 (ASM1) was coupled with real energy pricing and a power consumption model and applied as a dynamic simulation case study. The model calibration is based on the STOWA protocol. The case study investigates the importance of providing real energy pricing comparing (i) real energy pricing, (ii) weighted arithmetic mean energy pricing and (iii) arithmetic mean energy pricing. The operational strategies evaluated were (i) old versus new air diffusers, (ii) different DO set-points and (iii) implementation of a carbon removal controller based on nitrate sensor readings. The application in a full scale WRRF of the ASM1 model coupled with real energy costs was successful. Dynamic modelling with real energy pricing instead of constant energy pricing enables the wastewater utility to optimize energy consumption according to the real energy price structure. Specific energy cost allows the identification of time periods with potential for linking WRRF with the electric grid to optimize the treatment costs, satisfying operational goals.
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Research Article|
February 21 2017
Modelling energy costs for different operational strategies of a large water resource recovery facility
P. Póvoa;
1EPAL, Av. da Liberdade, Lisboa 1250-144, Portugal
E-mail: p.povoa@adp.pt
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A. Oehmen;
A. Oehmen
2UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica 2829-516, Portugal
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P. Inocêncio;
P. Inocêncio
1EPAL, Av. da Liberdade, Lisboa 1250-144, Portugal
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J. S. Matos;
J. S. Matos
3Instituto Superior Técnico – IST, Avenida Rovisco Pais 1, Lisboa 1049-001, Portugal
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A. Frazão
A. Frazão
1EPAL, Av. da Liberdade, Lisboa 1250-144, Portugal
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Water Sci Technol (2017) 75 (9): 2139–2148.
Article history
Received:
August 30 2016
Accepted:
February 07 2017
Citation
P. Póvoa, A. Oehmen, P. Inocêncio, J. S. Matos, A. Frazão; Modelling energy costs for different operational strategies of a large water resource recovery facility. Water Sci Technol 12 May 2017; 75 (9): 2139–2148. doi: https://doi.org/10.2166/wst.2017.098
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