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Water quality soft-sensor prediction in anaerobic process using deep neural network optimized by Tree-structured Parzen Estimator |
Junlang Li1, Zhenguo Chen1, Xiaoyong Li1, Xiaohui Yi1, Yingzhong Zhao2, Xinzhong He2, Zehua Huang2, Mohamed A. Hassaan3, Ahmed El Nemr3, Mingzhi Huang1,4() |
1. SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou 510006, China 2. Fujian Environmental Protection Design Institute Co. Ltd, Fuzhou 350000, China 3. National Institute of Oceanography and Fisheries, NIOF, Alexandria 21556, Egypt 4. SCNU Qingyuan Institute of Science and Technology Innovation Co., Ltd., Qingyuan 511517, China |
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Abstract ● Hybrid deep-learning model is proposed for water quality prediction. ● Tree-structured Parzen Estimator is employed to optimize the neural network. ● Developed model performs well in accuracy and uncertainty. ● Usage of the proposed model can reduce carbon emission and energy consumption. Anaerobic process is regarded as a green and sustainable process due to low carbon emission and minimal energy consumption in wastewater treatment plants (WWTPs). However, some water quality metrics are not measurable in real time, thus influencing the judgment of the operators and may increase energy consumption and carbon emission. One of the solutions is using a soft-sensor prediction technique. This article introduces a water quality soft-sensor prediction method based on Bidirectional Gated Recurrent Unit (BiGRU) combined with Gaussian Progress Regression (GPR) optimized by Tree-structured Parzen Estimator (TPE). TPE automatically optimizes the hyperparameters of BiGRU, and BiGRU is trained to obtain the point prediction with GPR for the interval prediction. Then, a case study applying this prediction method for an actual anaerobic process (2500 m3/d) is carried out. Results show that TPE effectively optimizes the hyperparameters of BiGRU. For point prediction of CODeff and biogas yield, R2 values of BiGRU, which are 0.973 and 0.939, respectively, are increased by 1.03%–7.61% and 1.28%–10.33%, compared with those of other models, and the valid prediction interval can be obtained. Besides, the proposed model is assessed as a reliable model for anaerobic process through the probability prediction and reliable evaluation. It is expected to provide high accuracy and reliable water quality prediction to offer basis for operators in WWTPs to control the reactor and minimize carbon emission and energy consumption.
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Keywords
Water quality prediction
Soft-sensor
Anaerobic process
Tree-structured Parzen Estimator
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Corresponding Author(s):
Zhenguo Chen,Mingzhi Huang
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Issue Date: 22 December 2022
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