Water is essential and inevitable for the survival of almost all known forms of life on earth. Human civilization, agriculture and industries have historically flourished around rivers and major waterways. Water is important for the existence and growth of industries. Clean and fresh drinking water is essential to human and other lives. In fact, only 1 % of the worlds water is usable to us. About 97 % is salty seawater and 2 % is frozen in glaciers and polar ice caps. Thus 1 % of the worlds water supply is a precious commodity necessary for our survival. Contaminated water may contain...