The first volume on environmental processes gives a profound overview on the biotechnology of wastewater. Part I deals with general aspects such as microbial metabolism, biofilms, analytical techniques, threshold values, methods of monitoring and regulations. Processes of wastewater treatment are presented in Part II: providing a lot of practical information origins and composition of wastewater from municipal, industrial and agricultural sources as well as aerobic and anaerobic processes in different types of reactors are described.