This book presents peer-reviewed papers from the 5th International Conference on Biomass Utilization and Sustainable Energy 2025 (ICoBiomasSE 2025) organized by the Centre of Excellence for Biomass Utilization (COEBU), Universiti Malaysia Perlis (UniMAP). The theme of the conference "Harnessing Biomass for a Circular Economy: Innovations in Energy Transition" has been selected to highlight the critical role of biomass in reducing reliance on fossil fuels, enhancing resource efficiency, and promoting sustainable energy solutions. The contents are broadly divided into seven parts: (1) sustainable biomass resources for decarbonising the economy, (2) biomass conversion technologies for bioenergy (3) biomass conversion to intermediates and products, (4) bioeconomy sustainability, impacts and policies, (5) bioenergy integration. This compilation serves as a valuable platform for students, professionals, researchers, academicians, policymakers, and industry experts to engage in discussions on innovative solutions to environmental challenges, contributing to a more sustainable future. Additionally, it provides valuable insights for environmentalists and material scientists involved in planning, engineering, and management. 

Dr. Hui Lin Ong is currently an Associate Professor at the Faculty of Chemical Engineering & Technology, Universiti Malaysia Perlis, Malaysia. She obtained her Ph.D. majoring in Advanced Materials, from Universiti Sains Malaysia, Penang, Malaysia in 2010. Her research interests are in the areas of nanomaterials from agricultural waste and polymer-based nanocomposites for packaging, membranes, and energy storage applications.

Dr. Siti Jamilah Hanim Mohd Yusof is a Senior Lecturer in the Department of Chemical Engineering, Faculty of Chemical Engineering & Technology, Universiti Malaysia Perlis, Perlis, Malaysia. She obtained her Ph.D. in Biochemical Engineering from Universiti Putra Malaysia. Her field of interests is pretreatment technologies and biomass utilization.

Dr. Jalilah Abd Jalil is a Senior Lecturer in the Department of Polymer Engineering, Faculty of Chemical Engineering & Technology, Universiti Malaysia Perlis, Malaysia. She obtained her PhD in  Materials Engineering from Nara Institute of Science & Technology (NAIST), Japan. Her research expertise encompasses the radical polymerization of copolymers, the synthesis of polythiophenes, and the development of chiral luminescent materials.

Dr. Boon-Beng Lee is currently working as a senior lecturer in the Faculty of Chemical Engineering & Technology at Universiti Malaysia Perlis (UniMAP). He is also a research fellow of Centre of Excellence for Biomass Utilization (CoEBU), UniMAP. He obtained his PhD from the University of Queensland, Australia. He was working in a multi-national medical device company (C.R. Bard, Inc.), as a process engineer. 

Dr. Alina Rahayu Mohamed is currently an Associate Professor in the Faculty of Chemical Engineering and Technology at Universiti Malaysia Perlis (UniMAP), Perlis, Malaysia. She obtained her Phd in Bioprocess Engineering from UniMAP. Her research interest is in the area of biomass thermochemical processing such as pyrolysis and torrefaction, non-isothermal thermogravimetric pyrolysis kinetics of biomass via Kissinger, Ozawa and Coats-Redfern methods, isothermal torrefaction of biomass in a reactor and pyrolysis of torrefied biomass.