Waste water as a source for secondary resources and linkage to other urban systems

Urban metabolism studies have shown that, in terms of sheer mass, water is the largest and the most vital component. Population growth and higher living standards will cause ever increasing demands for good quality municipal and industrial water, and ever increasing sewage flows within a limited area. Within this paper we will address the question whether there are better ways of meeting the various qualities and consequently reduce our water needs. The quantitative assessment of water quality and its relationships with management activities is a necessary step in efficient water resources management