This book edition on "Wastewater Management and Technologies" brings together a wealth of expertise by the authors, who exemplify the wide range of options available--from nature-based solutions to different levels of technology--and the different experiences through case studies from around the world, with a particular focus on conditions in developing countries. The book is part of a book series (special editions) based on the publication of the book "Water and Wastewater Management", published by Springer in 2022 (ISBN 978-3-030-9528-7). The part about "Wastewater Management and Technologies" edited in this book will be deepened with this first special edition in terms of technological topics.