Integration of anaerobic digestion with heat pump: machine learning-based technical and environmental assessment

Hajabdollahi Ouderji, Z., Gupta, R. , Mckeown, A., Yu, Z. , Smith, C. , Sloan, W. and You, S. (2023) Integration of anaerobic digestion with heat pump: machine learning-based technical and environmental assessment. Bioresource Technology, 369, 128485. (doi: 10.1016/j.biortech.2022.128485)

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Anaerobic digestion (AD)-based biogas production mitigates the environmental footprint of organic wastes (e.g., food waste and sewage sludge) and facilitates a circular economy. The work proposed an integrated system where the thermal energy demand of an AD is supplied using an air source heat pump (ASHP). The proposed system is compared to a baseline system, where the thermal energy is supplied by a natural gas-based heating system. Several machine learning models are developed for predicting biogas production, among which the Gaussian Process Regression (GPR) showed a superior performance (R2=0.84 and RMSE=0.0755 L gVS-1 day-1). The GPR model further informed a thermodynamic model of the ASHP, which revealed the maximum biogas yield to be approximately 0.585 at an optimal temperature of 55 °C (thermophilic). Subsequently, life cycle assessment showed that ASHP-based AD heating systems achieved 28.1% (thermophilic) and 36.8% (mesophilic) carbon abatement than the baseline system.

Item Type:Articles
Glasgow Author(s) Enlighten ID:You, Dr Siming and Hajabdollahi Ouderji, Dr Zahra and Mckeown, Andrew and Gupta, Dr Rohit and Sloan, Professor William and Smith, Professor Cindy and Yu, Professor Zhibin
Authors: Hajabdollahi Ouderji, Z., Gupta, R., Mckeown, A., Yu, Z., Smith, C., Sloan, W., and You, S.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Bioresource Technology
ISSN (Online):1873-2976
Published Online:12 December 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in Bioresource Technology 369: 128485
Publisher Policy:Reproduced under a Creative Commons License
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
309846Decentralised water technologiesWilliam SloanEngineering and Physical Sciences Research Council (EPSRC)EP/V030515/1ENG - Infrastructure & Environment