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Parameters optimization using an artificial neural networks and release characteristics of humic acids during lignite bioconversion

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Abstract

The bioconversion of coal at ambient conditions is a promising technology for coal processing. However, there are few examples of the optimization of processes for industrial-scale use. In this work, the optimization of process parameters affecting lignite bioconversion by an isolated fungus WF8 using an artificial neural network (ANN) combined with a genetic algorithm (GA) was carried out for modeling of humic acids (HAs) yield and parameters. Kinetic models were used to understand the release characteristics of HAs from the bioconversion of lignite. The results of the present work indicate that the optimal process parameters (OPP) are 29 °C, initial pH of 7, 180 rpm, 0.6 mmol·L−1 of CuSO4, 0.4 mmol L−1 of MnSO4, and 6.4 μmol·L−1 of veratryl alcohol (VA). The predicted experimental data obtained by ANN is similar to the actual and the significant correlation coefficient value (R2) of 0.99 indicates that ANN has good predictability. The actual yield of HAs are 5.17 mg·mL−1. During bioconversion, the fungus WF8 could loosen and attack the structure of lignite. The release of HAs produced by bioconversion of lignite under the OPP via diffusion and swelling is fit to zero-order model independent on concentration. This provides support for the industrial bioconversion of lignite.

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Abbreviations

AMs:

Alkaline metabolites

ANN:

Artificial neural network

GA:

Genetic algorithm

Has:

Humic acids

Lac:

Laccase

LiP:

Lignin peroxidase

MnP:

Manganese peroxidase

NL:

Nitric acid-pretreated lignite

OPP:

Optimal process parameters

S.D:

Standard deviation

VA:

Veratryl alcohol

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Acknowledgements

This work was supported by the Fundamental Research Funds for the Central Universities (2019XKQYMS60).

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Authors and Affiliations

  1. Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Jing-Hua Yao, Bai-Chao Xu, De-Yu Zhuo & Lei Xiao

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  1. Jing-Hua Yao
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  2. Bai-Chao Xu
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  3. De-Yu Zhuo
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Correspondence to Lei Xiao.

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Yao, JH., Xu, BC., Zhuo, DY. et al. Parameters optimization using an artificial neural networks and release characteristics of humic acids during lignite bioconversion. Bioprocess Biosyst Eng 45, 1223–1235 (2022). https://doi.org/10.1007/s00449-022-02740-w

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  • DOI: https://doi.org/10.1007/s00449-022-02740-w

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