**Chapter 18 355**

Biogas as a Sustainable Fuel and Feedstock: Properties, Purification, and Applications *by Moses Jeremiah Barasa Kabeyi and Oludolapo Akanni Olanrewaju*

Preface

Realizing that our current economic system could lead to the collapse of civilization as we know it, the emphasis is now on an economy that is positive for people and the planet. The aim is to turn the tide and bring nature back to the center of our economy. The change from the linear economic system to circular models with bio-resources as its true engine is the pivot to build a resilient and sustainable future. Therefore, in this book, we explore the use of biomass as a source of a multitude of sustainable biological products. This book consists of 18 chapters written by renowned researchers from every part of the world. Each chapter provides an overview of basic information on the subject in question. We hope that the chapters in this work will benefit students, researchers, and professionals engaged in biomass-based technology and inspire

**Eduardo Jacob-Lopes, Leila Queiroz Zepka and Rosangela Rodrigues Dias**

Food Science and Technology Department, Federal University of Santa Maria, UFSM,

Santa Maria, RS, Brazil

research ideas and future directions.
