This book provides a comprehensive overview of biochar as a sustainable solution within the context of agriculture, waste management, environmental remediation, and the circular economy. The initial chapters introduce the concept of biochar and its alignment with circular economic principles and presents the mechanisms of action and multifunctional benefits across different sectors. The chapters explore innovative biochar production techniques using agricultural residues, food waste, and municipal sludge, highlighting efficiency, scalability, and environmental impact. The book also details the application of biochar in soil enhancement, wastewater treatment, and bioenergy systems including biogas and biohydrogen production. The final chapters emphasize the pivotal role of biochar in carbon sequestration and climate change mitigation, solidifying its relevance to global sustainability goals. Key Features:Explains the concept of biochar within the framework of the circular economy and sustainable developmentDetails innovative production techniques using various biomass feedstocks including agricultural waste, food scraps, and sewage sludgeExplores agricultural applications, such as improving soil structure, fertility, and crop yieldPresents industrial uses of biochar in removing contaminants like heavy metals and dyes from wastewaterHighlights its role in anaerobic digestion and renewable energy, especially in biogas and hydrogen generationThis book is useful for researchers and professionals of biotechnology and environmental sciences.