Preface
'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
the tables and part of the science behind the tables. You won't learn to build
wastewater treatment plants by reading this book; the idea is to create a scientifically 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.
Lyngby, Autumn 1996
Mogens Henze
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