Sewage water is a complex mixture in terms of chemical, biological, and physical
characteristics. It is part of the most renewable wastewaters, while it should not be, at least in
arid and semiarid countries. A trogonal problem of aridity, increasing population, and
mismanagement of natural resources exists in many areas of the world, predominantly in the
southern hemisphere and politically referred to as developing countries. Increasing
population per se imposes the adoption of new strategies for handling wastewater