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- W3119373571 abstract "This study develops a multi-objective supervisory control (MOSC) strategy for wastewater treatment based on hybrid machine-learning algorithms that search optimal setpoints of multiple controllers under varying influent conditions. A wastewater treatment plant (WWTP) operation was modeled by Benchmark Simulation Model No. 2 (BSM2), and influent conditions were generated in consideration of a H-WWTP in South Korea. Two proportional-integral (PI) controllers for dissolved oxygen and biogas, and one cascade-PI controller for nitrate were used as local control loops. The MOSC strategy identified five influent scenarios using fuzzy c-means algorithms and nitrogen-to-carbon ratios. Then, the control performance according to influent changes was gauged employing a deep-learning-based approximation model, and optimal setpoints for the controllers were determined by a non-dominated sorting genetic algorithm. The results demonstrate that an intelligent MOSC strategy can identify optimal setpoints to improve WWTP performance and outperform a reference control across a range of possible ratios of total Kjeldahl nitrogen to chemical oxygen demand (TKN/COD) in influent disturbances. The MOSC strategy was also able to accommodate extreme influent conditions, reduce operational costs by 8%, maintain effluent quality, and produce biogas for sustainable WWTP operation. • MOSC was developed to search the optimal setpoints under various influent conditions. • FCM algorithm was utilized to cluster and identify the influent load conditions. • DL predicted the control objectives from the influent conditions and setpoints. • Optimal setpoints were determined by NSGA-II to meet the control objectives. • It guidelines sustainable WWTP for varying TKN/COD and extreme influent conditions." @default.
- W3119373571 created "2021-01-18" @default.
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- W3119373571 date "2021-04-01" @default.
- W3119373571 modified "2023-09-24" @default.
- W3119373571 title "A hybrid machine learning–based multi-objective supervisory control strategy of a full-scale wastewater treatment for cost-effective and sustainable operation under varying influent conditions" @default.
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- W3119373571 doi "https://doi.org/10.1016/j.jclepro.2021.125853" @default.
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