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'Art is about guessing the correct solution. Science is about producing tables in which we can find the correct solution, and engineering is about consulting the tables'. Poul Henningsen (Danish architect and writer) This book has been written for engineers who wish to familiarize themselves with and part of the science behind the tables. You won't learn to build the tables wastewater treatment plants by reading this book; the idea is to create a scientifical ly based platform from which to work. The book has been written for M.Sc. and Ph.D. students, consulting engineers and process engineers at wastewater treatment plants. Drawings have been produced by Birte Brejl and Torben Dolin. Translation of the 2nd Danish edition by Nancy M. Andersen was made possible by a grant from the CowiConsult Foundation. Thank you. Lyngby, Spring 1995 Mogens Henze Preface to 2nd edition The 2nd edition has been slightly revised. The book can be used together with the 1st edition as figures and equations have kept their numbering.