Application of enzymatic and bacterial biodelignification systems for enhanced breakdown of model lignocellulosic wastes

Muaaz-Us-Salam, Syed, Cleall, Peter John ORCID: https://orcid.org/0000-0002-4005-5319 and Harbottle, Michael John ORCID: https://orcid.org/0000-0002-6443-5340 2020. Application of enzymatic and bacterial biodelignification systems for enhanced breakdown of model lignocellulosic wastes. Science of the Total Environment 728 , 138741. 10.1016/j.scitotenv.2020.138741

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Abstract

This paper explores the extent to which enzymatic and bacterial biodelignification systems can breakdown lignocellulose in model wastes to potentially enhance biogas generation. Two representative lignocellulosic wastes (newspaper and softwood) commonly found largely undegraded in old landfills were used. A fungal peroxidase (lignin peroxidase) enzyme and a recently isolated lignin-degrading bacterial strain (Agrobacterium sp.) were used. Tests were conducted in stirred bioreactors with methanogens from sewage sludge added to produce biogas from breakdown products. Addition of lignin peroxidase resulted in ~20% enhancement in cumulative methane produced in newspaper reactors. It had a negative effect on wood. Agrobacterium sp. strain enhanced biodegradation of both wood (~20% higher release of soluble organic carbon and enhanced breakdown) and newspaper (~2-fold biogas yield). The findings of this paper have important implications for enhanced breakdown in old landfills that are rich in these wastes, and anaerobic operations utilising lignocellulosic wastes for higher degradation efficiencies and biogas production.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Elsevier
ISSN:	0048-9697
Date of First Compliant Deposit:	15 April 2020
Date of Acceptance:	14 April 2020
Last Modified:	18 Nov 2024 17:45
URI:	https://orca.cardiff.ac.uk/id/eprint/131012

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