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Retraining prior state performances of anaerobic digestion improves prediction accuracy of methane yield in various machine learning models

Authors :
Hang-Bae Jun
Jun-Gyu Park
Tae-Young Heo
Source :
Applied Energy. 298:117250
Publication Year :
2021
Publisher :
Elsevier BV, 2021.

Abstract

The prediction of anaerobic digestion (AD) performance using numerical models, which are based on mathematics and kinetics, is being challenged by poor mechanistic understanding and the non-linear relationships between performance and operational parameters. This study demonstrated that various machine learning (ML) models using the 1-step ahead with the retraining method, which utilized AD performance data from prior states, can improve the prediction accuracy of ML models. For the four types of ML models studied, the 1-step ahead with the retraining method could improve the root mean square errors by 32–49% compared to the conventional multi-step ahead method, which was particularly noteworthy during the transition period when AD reactors were faced with loading shocks and showed inhibited methane yields. Moreover, the 1-step ahead with the retraining method showed the potential of achieving accurate predictions using a single input parameter, pH, which was considerably less labor-intensive to monitor than the other parameters often required in AD models (e.g., VSS). As such, the 1-step ahead with retraining method is suitable for efficient real-time prediction of AD performance in real-world operations.

Details

ISSN :
03062619
Volume :
298
Database :
OpenAIRE
Journal :
Applied Energy
Accession number :
edsair.doi...........c3b3bbe12a47e7639775d1b4716789f4
Full Text :
https://doi.org/10.1016/j.apenergy.2021.117250