This 8th symposium in the series of biennial Gothenburg Symposia continues to bring together research scientists, designing and operating engineers and funding and supervising administrators. The total sum of these contributions document again the development in the field, both in terms of new technological (and other) developments as well as public and administrative acceptance and approval of solutions offered. Such new developments include the use of advanced oxidation processes in actual water treatment, use of membrane technology or even particle addition for intensified particle removal. Contributions on energy and exergy analyses and on sustainability show that the mostly technical solutions that are proposed are very much seen and discussed in a broader context of economics, public acceptance and ecological balance.