Presently, the world is faced with serious water problems. but these problems with become more intense and more complex in the future. our increasing population with tremendously increase urban waters, primarily sewage. on the other hand, increasing demands for water with decrease substantially the amount of water available for diluting wastes.
Rapidly expanding industries which involve more and more complex chemical processes will produce large volumes of liquid wastes. many of these with contain chemicals that are poisonous. to feed our rapidly expanding population, agriculture will have to be intensified.
