Introduction: Professor Glen T. Daigger is a world wastewater treatment expert, especially in the field of biological treatment technology. He is currently a professor at the University of Michigan, academician of the American Academy of Engineering, former President of the International Water Association (IWA), Vice President and Chief Technology Officer, CH2M HILL. He has published more than 100 technical papers, four books and several technical manuals, which have made outstanding contributions to the application of wastewater treatment technology. He serves as Chairman of various committees of the Water Environment Federation (WEF) and published the book Design of Municipal Wastewater Treatment Plants; He also is the Chairman of the Editorial Board of Water Environment Research, Chairman of Technical Applications Committee, Chairman of Committee Leadership Council (CLC), Member of the House of Representatives and member of the Committee. Professor Glen T. Daigger was a member of the Board, and Chairman of the Research Advisory Panel of the World Environmental Research Foundation (WERF). He has received a number of awards, including the Kappe and Freese Award, and the Harrison Prescott Eddy, Morgan and Gascoigne Awards from the Water Environment Federation. Glen Daigger topped the list of the world's 25 water industries selected by the Water and Wastewater International in 2016, gaining worldwide recognition.