Book excerpt: This book discusses new and innovative trends and techniques in the removal of toxic and refractory pollutants by means of various microbial biotechnology processes from wastewater, both on the laboratory and industrial scales. The book also highlights the main factors contributing to the removal of toxic pollutants as well as recycling, environmental impact, and wastewater policies after heavy metal removal. In addition, it assesses the potential application of several existing bioremediation techniques and introduces new cutting-edge emerging technologies. This book significantly contributes to the wastewater treatment plant industry so that the treatment systems can serve better and more resiliently for the purpose. This book is designed for engineers, scientists, and other professionals who are seeking introductory knowledge of the principles of environmental bioremediation technology and for students who are interested in the environmental microbiology and bioremediation fields.