TURBIDITY OF WATER Turbidity is one of the indicator parameters of water that gives an insight into the quality of water, a turbid water will always be undesirable and it is one of the major problem of water and water treatment. What is Turbidity? Scientifically turbidity is the measurement of relative clarity of a liquid. Turbidity is the amount of cloudiness in water. Turbidity of water is caused by suspended or dissolved particles in water; these particles can include clay, silt, fine organic and inorganic matters, algae and other micro organisms. Turbidity of water as an important factor in determining the quality of water has a specification set by World Health Organization[ WHO ] for drinking water, although most water treatment plants strive to achieve as low as 0NTU, but WHO and EPA stated that for drinking water the turbidity should ideally be below 1NTU and should not exceed 5NTU. The unit of turbidity is NTU, although there are other units such as ...
Iron is one of the major secondary contaminant in both domestic and industrial water supply. Iron have caused water industries several billions of dollars . Iron is the second most abundant metal in the earth's crust behind Aluminum(8%), of which iron accounts for about 5%. Elemental iron is rarely found in nature, as the iron ions Fe2+ and Fe3+ readily combine with oxygen- and sulfur-containing compounds to form oxides, hydroxides, carbonates, and sulfides. As rain fall, rain water infiltrates the soil and underlying geologic formations and dissolves iron, causing it to seep into aquifers that serve as sources of groundwater for wells. In surface water, such as rivers and lakes, dissolved iron is hardly ever found, because it readily reacts with oxygen, forms insoluble compounds and sinks out into the bottom of the water body. Iron is seldom found at concentrations greater than 10 milligrams per liter (mg/L) or 10 parts per million. The iron that seep into the sources of g...