The engineering discipline which focuses on the application of the scientific and engineering principles for the improvement and maintenance of the environment is known as environmental engineering. It is a sub-discipline of chemical engineering and civil engineering. Environmental engineering uses concepts from various scientific topics such as geology, microbiology, chemistry, ecology, biology, hydraulics and mathematics in order to find ways to protect and improve the health of living organisms. It aims to protect human health and ecosystems, and improve the environment-related quality of human life. This book is a compilation of chapters that discuss the most vital concepts in the field of environmental engineering.While understanding the long-term perspectives of the topics, it makes an effort in highlighting their impacts as a modern tool for the growth of the discipline. This book will provide comprehensive knowledge to the readers.