In most of the industries, industrial effluent treatment plants are playing vital roles to ensure the efficient management of industrial effluent for supporting sustainable development of our society. Due to the technological development, new concepts about future wastewater management are being incorporated by process industries in the whole world, including recyclable resources and energy/nutrient recovery from industrial effluent, etc. However, conventional treatment methods including biotechnological methods used in treatment plants are facing a lot of difficulties due to the strict discharging norms and coming out of new-fangled pollutants. Recently, a novel concept microbial niche nexus sustaining biological wastewater treatment was introduced, which can accomplish the significant removal of toxic emerging pollutants by different microbial communities, with the concern of other components like integrated and healthy ecosystem. The book focuses on research related to future potential and progress of microbial niche-based environmental biotechnology such as microbial enrichment, microbial function, system design, new technological developments and its applications. Besides, the book reviews important interconnections between water, energy, and the environment as security in water and energy, and the environment is associated with human beings, natural resources, economic, and environmental sustainability. In addition, the book describes innovative green technologies with the aim of enhancing the present state-of-the-art technologies in the various fields like water, energy, the environment, and the related potential fields of industrial wastewater treatment.