Abstract
Coagulation process is a key link of drinking water treatment. For the large lag characteristic of coagulation process, conventional PID control could not achieve a satisfactory effect for the frequent changes of raw water quality. Thus, a composite control scheme based on random forest algorithm and second-order sliding mode controller is proposed in this paper. Within the proposed composite control scheme, RF model provides timely feedforward control for coagulant dosage according to the changing raw water quality, and SOSM controller adjusts the coagulant dosage to adapt the nonlinearity and uncertainty of coagulation process as a feedback controller. The combination of feedforward control and feedback control constitutes the real-time optimization control of coagulation process. The experimental results show that the proposed composite control scheme has better adaptability to the changes of raw water quality and higher control accuracy for stable effluent turbidity compared with the exponential reaching law sliding mode control and conventional PID control.
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Acknowledgements
This work is supported by the National Natural Science Foundation of China (51708299), Science and Technology Project of Water Conservancy of Jiangsu Province (2020056), Major Science and Technology Program for Water Pollution Control and Treatment (2012ZX07403-001).
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Wang, D., Wu, J., Deng, L. et al. A real-time optimization control method for coagulation process during drinking water treatment. Nonlinear Dyn 105, 3271–3283 (2021). https://doi.org/10.1007/s11071-021-06794-5
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DOI: https://doi.org/10.1007/s11071-021-06794-5