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REVIEW

Bacterial Biorefineries: Transforming Agro-Industrial Waste into Sustainable Solutions for a Circular Bioeconomy

Sevakumaran Vigneswari1,2,*, Muhammad Shahrul Md Noor3, Fazilah Ariffin3,4, Azila Adnan3,4, Amirah Alias3, Lakshmanan Muthulakshmi5, Hemalatha Murugaiah6, Nor Omaima Harun3,4, Nurul Nadhirah Ruzelan3, Lakshiminarayanan Rajamani2
1 Institute of Climate Adaptation and Marine Biotechnology (ICAMB), Universiti Malaysia Terengganu, Kuala Nerus, 21030, Terengganu, Malaysia
2 Ocular Infections and Antimicrobials Research Group, Singapore Eye Research Institute, The Academia, 20 College Road, Discovery Tower, Singapore, 169856, Singapore
3 Faculty of Science and Marine Environment, Universiti Malaysia Terengganu, Kuala Nerus, 21030, Terengganu, Malaysia
4 BioSES Research Interest Group, Faculty of Science and Marine Environment, Universiti Malaysia Terengganu, Kuala Nerus, 21030, Terengganu, Malaysia
5 Biomaterials and Product Development laboratory, Department of Biotechnology, Kalasalingam Academy of Research and Education, Anand Nagar, Krishnankoil, 626126, Tamil Nadu, India
6 School of Applied Science, Faculty of Integrated Life Sciences, Quest International University, Ipoh, 34020, Perak, Malaysia
* Corresponding Author: Sevakumaran Vigneswari. Email: email
(This article belongs to the Special Issue: Valorization of Lignocellulosic Biomass for Functional Materials)

Journal of Renewable Materials https://doi.org/10.32604/jrm.2025.02025-0148

Received 27 July 2025; Accepted 09 October 2025; Published online 28 November 2025

Abstract

The escalating accumulation of agro-industrial waste—exceeding 350 million tons annually from post-harvest residues, food processing, and aquaculture—poses serious environmental threats, including greenhouse gas emissions, groundwater contamination, and excessive landfill usage. Although conventional treatment methods such as composting, incineration, and recycling offer partial mitigation, they often fall short of delivering scalable, circular solutions. Microbial biorefineries have emerged as a transformative approach, enabling the conversion of diverse biomass streams into high-value renewable materials. Through microbial fermentation, agricultural and municipal waste can be repurposed into functional outputs such as nanocellulose, biochar, and biocompatible compounds with applications in packaging, pharmaceuticals, and cosmetics. This review critically examines the role of microbial systems in agro-waste valorization, highlighting recent advances in strain engineering, process integration, and bioproduct development. It also explores the regulatory and techno-economic frameworks required to scale these innovations within a biomass-driven circular economy, positioning microbial biorefineries as key enablers of sustainable material transitions.

Graphical Abstract

Bacterial Biorefineries: Transforming Agro-Industrial Waste into Sustainable Solutions for a Circular Bioeconomy

Keywords

Agro-waste; bioeconomy; environmental sustainability; circular economy

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