This book focuses on the biologically derived adsorbent with numerous applications in wastewater treatment, metal recovery, biosensor development, and so forth. It initiates with the description of biological sources of biosorbents followed by applications of biosorbents, biosorption isotherms, assessment of biosorbents with various tools, pretreatment of biosorbents, and its mode of action. Some less explored areas like separation of radionuclides, biosorption of volatile organic compounds, and animal-based biosorbents are also explained. Features: Focuses on fundamentals, characteristics of flora and fauna-mediated biosorbents used extensively Describes entire aspects of tools and techniques related to assessment and monitoring of biosorbents Includes adsorption kinetics, adsorption isotherm, and mechanism of action of biosorbents Covers advancements in pretreatment methods to enhance the adsorption process of biosorbents Reviews recent applications which include heavy metal removal, dye remediation, and separation of radionuclides and nano-biosorbents This book is aimed at graduate students and researchers in bioprocess engineering, microbiology, and biotechnology.