Design of feedback control strategies in a plant-wide wastewater treatment plant for simultaneous evaluation of economics, energy usage, and removal of nutrients
Sheik, Abdul (National Institute of Technology. Department of Chemical Engineering)
Tejaswini, Egalapati (National Institute of Technology. Department of Chemical Engineering)
Seepana, Murali (National Institute of Technology. Department of Chemical Engineering)
Ambati, Seshagiri (National Institute of Technology. Department of Chemical Engineering)
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)

Data:	2021
Resum:	Simultaneous removal of nitrogen and phosphorous is a recommended practice while treating wastewater. In the present study, control strategies based on proportional-integral (PI), model predictive control (MPC), and fuzzy logic are developed and implemented on a plant-wide wastewater treatment plant. Four combinations of control frameworks are developed in order to reduce the operational cost and improve the effluent quality. As a working platform, a Benchmark simulation model (BSM2-P) is used. A default control framework with PI controllers is used to control nitrate and dissolved oxygen (DO) by manipulating the internal recycle and oxygen mass trans-fer coefficient (KLa). Hierarchical control topology is proposed in which a lower-level control framework with PI controllers is implemented to DO in the sixth reactor by regulating the KLa of the fifth, sixth, and seventh reactors, and fuzzy and MPC are used at the supervisory level. This supervisory level considers the ammonia in the last aerobic reactor as a feedback signal to alter the DO set-points. PI-fuzzy showed improved effluent quality by 21. 1%, total phosphorus removal rate by 33. 3% with an increase of operational cost, and a slight increase in the production rates of greenhouse gases. In all the control design frameworks, a trade-off is observed between operational cost and effluent quality.
Ajuts:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1202 Agencia Estatal de Investigación PID2019-105434RB-C33
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:	Supervisory layer ; BSM2 model ; Model predictive control ; Fuzzy controller ; Operational cost
Publicat a:	Energies, Vol. 14, Issue 19 (October 2021) , art. 6386, ISSN 1996-1073

DOI: 10.3390/en14196386

19 p, 5.4 MB

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