Design of Feedback Control Strategies in a Plant-Wide Wastewater Treatment Plant for Simultaneous Evaluation of Economics, Energy Usage, and Removal of Nutrients
Autor: | Ramon Vilanova, Murali Mohan Seepana, Montse Meneses, Eagalapati Tejaswini, Seshagiri Rao Ambati, Abdul Gaffar Sheik |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
operational cost
Technology Control and Optimization model predictive control Energy Engineering and Power Technology Supervisory layer Fuzzy logic fuzzy controller Nutrient Model predictive control Electrical and Electronic Engineering Process engineering Engineering (miscellaneous) Effluent Renewable Energy Sustainability and the Environment business.industry Building and Construction Operational cost Wastewater BSM2 model Fuzzy controller Greenhouse gas supervisory layer Benchmark (computing) Environmental science Sewage treatment business Energy (miscellaneous) |
Zdroj: | Energies; Volume 14; Issue 19; Pages: 6386 Energies, Vol 14, Iss 6386, p 6386 (2021) |
ISSN: | 1996-1073 |
DOI: | 10.3390/en14196386 |
Popis: | 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 transfer 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. |
Databáze: | OpenAIRE |
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