Quantifying the benefit of a dynamic performance assessment of WWTP
Revollar, Silvana. (Universidad de Salamanca. Departamento de Informática y Automática)
Meneses Benítez, Montserrat (Universitat Autònoma de Barcelona. Departament de Telecomunicació i Enginyeria de Sistemes)
Vilanova i Arbós, Ramon (Universitat Autònoma de Barcelona. Departament de Telecomunicació i Enginyeria de Sistemes)
Vega, Pastora (Universidad de Salamanca. Departamento de Informática y Automática)
Francisco, Mario (Universidad de Salamanca. Departamento de Informática y Automática)

Data:	2020
Resum:	In this work a comprehensive analysis of the environmental impact of the operation of a wastewater treatment plant (WWTP) using different control strategies is carried out considering the dynamic evolution of some environmental indicators and average operation costs. The selected strategies are PI (proportional integral) control schemes such as dissolved oxygen control in the aerobic zone (DO control), DO control and nitrates control in the anoxic zone (DO + NO control) and regulation of ammonium control at the end of aerobic zone (Cascade Scommonly used in WWTPs to maintain the conditions that ensure the desired effluent quality in a variable influent scenario. The main novelty of the work is the integration of potential insights into environmental impact from the analysis of dynamic evolution of environmental indicators at different time scales. The consideration of annual, bimonthly and weekly temporal windows to evaluate performance indicators makes it possible to capture seasonal effects of influent disturbances and control actions on environmental costs of wastewater treatment that are unnoticed in the annual-based performance evaluation. Then, in the case of periodic events, it is possible to find solutions to improve operation by the adjustment of the control variables in specific periods of time along the operation horizon. The analysis of the annual average and dynamic profiles (weekly and bimonthly) of environmental indicators showed that ammonium-based control (Cascade S) produce the best compromise solution between environmental and operation costs compared with DO control and DO + NO control. An alternative control strategy, named S Q , has been defined considering a sequence of changes on ammonium set-point (S) and carbon dosage (Q) on different temporal windows. It is compared with DO control considering weekly and bimonthly profiles and annual average values leading to the conclusion that both strategies, Cascade S and S Q , produce an improvement of dynamic and annual average environmental performance and operation costs, but benefits of Cascade S strategy are associated with reduction of electricity consumption and emissions to water, while S Q strategy reduces electricity consumption, use of chemicals (reducing external carbon dosage) and operation costs.
Ajuts:	Ministerio de Economía y Competitividad DPI2015-67341-C2-1-R Ministerio de Economía y Competitividad DPI2016-77271-R
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Wastewater treatment plants ; Environmental costs ; PID control ; Dynamic assessment of performance
Publicat a:	Processes, Vol. 8, Issue 2 (February 2020) , art. 206, ISSN 2227-9717

DOI: 10.3390/pr8020206

33 p, 4.4 MB

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