This book provides technical information on different biological and hybrid wastewater treatment systems for the treatment of wastewater and reuse, and tracks their progress towards practical and field-scale applications including strategies to be adopted for minimizing the losses and maximizing the benefits, as well as protecting the environment through the application of advanced biological and hybrid wastewater treatment Technology. In addition, it discusses the crucial parts that science, technology, and innovation play in the formulation, implementation, and administration of wastewater treatment policy. It highlights the challenges that must be overcome to adopt biological and hybrid wastewater treatment infrastructure regulations successfully and provides some answers. Also, it investigates how the biological and hybrid wastewater treatment technology may be used in a wide variety of field's sets apart from other on-the-shelf publications on the market. Also, it delves into the core concepts of Biological and Hybrid Wastewater Treatment Systems. It explores how these concepts can be modified to fit a variety of contexts and uses. Applications such as managing facilities, dealing with pandemics, urban wastewater treatment and reuse, farming, and other applications are included in this book. As a consequence, this book's content is engaging, and it will pique the interest of a diverse audience of readers who come from a wide variety of different professional backgrounds. Therefore, the book is written by local experts in the topic who dealing with the treatment of wastewater treatment technologies for a long time in India. This book will be helpful to researchers, entrepreneurs, professionals, planners, policymakers, environmental engineers, and others interested in biological and hybrid wastewater treatment system management strategies through the application of breakthroughs in biological and hybrid wastewater treatment technologies.