The Imhoff Paper

Karl Imhoff was the driving force in the development and invention of the technical apparatuses and methods of sewage treatment (the trickling – and activated sludge process). Imhoff provided not only significant technical innovations, but also design rules derived from experience in the operation of sewage treatment plants. He wrote a book Handbook of Urban Drainage in 1906, which today is released in new editions. In its 100-year history, the book has been translated 40 times. It has appeared in a total of 20 languages.